Posterior Region

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Gerry M Raghoebar - One of the best experts on this subject based on the ideXlab platform.

  • four or six implants in the maxillary Posterior Region to support an overdenture 5 year results from a randomized controlled trial
    Clinical Oral Implants Research, 2019
    Co-Authors: Wim Slot, Gerry M Raghoebar, Arjan Vissink, Marco S Cune, Henny J A Meijer
    Abstract:

    Objective To compare clinical and patient-reported outcomes when providing maxillary overdentures on four bar- and six bar-connected implants placed in the Posterior Region during a 5-year follow-up period. Materials and methods Sixty-six fully edentulous patients with functional maxillary denture complaints and insufficient bone volume to allow implant placement were scheduled for a maxillary sinus floor elevation procedure with bone from the anterior iliac crest and randomized to receive either four or six implants in the Posterior maxilla and four implants in the mandible. After 3 months of osseointegration, a bar-supported overdenture was constructed. Maxillary implant survival, overdenture survival, clinical scores, peri-implant bone height changes and patient satisfaction were assessed. Results Sixty patients completed the 5-year follow-up. Implant survival was 100% in the four-implant group and 99.5% in the six-implant group. No new overdentures had to be made in the four-implant group, and three new overdentures were made in the six-implant group due to excessive wear of the denture base and teeth (90.9% overdenture survival). Clinical parameters did not differ significantly between groups. Mean marginal bone loss compared to baseline was 0.58 +/- 0.51 mm in the four-implant group and 0.60 +/- 0.58 mm in the six-implant group, respectively. Overall, patient satisfaction improved significantly, but did not differ between groups. Conclusion Following a bilateral maxillary sinus floor elevation procedure, a bar-supported overdenture on four implants in the Posterior maxillary Region is not inferior to an overdenture supported by six implants after a 5-year evaluation period in patients with functional maxillary denture complaints and marked Posterior resorption (Clinical trial registration number: NTR2969).

  • a comparison between 4 and 6 implants in the maxillary Posterior Region to support an overdenture 1 year results from a randomized controlled trial
    Clinical Oral Implants Research, 2014
    Co-Authors: Wim Slot, Gerry M Raghoebar, Arjan Vissink, Henny J A Meijer
    Abstract:

    Objective To compare the treatment outcome of 4 vs. 6bar-connected implants in the Posterior Region of the maxilla to support an overdenture during a 1-year follow-up period. Materials and methods Sixty-six edentulous patients with an insufficient amount of bone volume in the maxilla to place implants were asked to participate in this study. Randomization assigned patients to either 4 or 6 implants. In all patients, a maxillary sinus floor elevation procedure with bone from the iliac crest was performed, and after a 3-month healing period, 4 or 6 dental implants were inserted in the maxillary Posterior Region in a one-stage procedure. After 3months of osseointegration, a bar-supported overdenture was constructed. Implant survival, overdenture survival, clinical scores, peri-implant bone height changes and patients' satisfaction were assessed. Study analysis was performed according a non-inferiority design. Results All patients completed the one-year follow-up. After a functional period of 1-year, implant survival was 100% in the 4 implants group and 99.5% in the 6 implants group. Overdenture survival was 100% in both groups. Mean clinical scores were very low and did not significantly differ between groups. Mean marginal bone resorption was 0.35 +/- 0.31mm and 0.46 +/- 0.34mm in the 4 and 6 implants group, respectively. Patients' satisfaction improved significantly in both groups, but did not differ between groups. Conclusion A bar-supported overdenture on 4 implants in the Posterior maxillary Region is not inferior to an overdenture supported by 6bar-connected dental implants.

  • impact of platform switching on peri implant bone remodeling around short implants in the Posterior Region 1 year results from a split mouth clinical trial
    Clinical Implant Dentistry and Related Research, 2014
    Co-Authors: Gerdien Telleman, Gerry M Raghoebar, Arjan Vissink, Henny J A Meijer
    Abstract:

    Aim: To assess the effect of platform switching on peri-implant bone remodeling around short implants (8.5mm) placed in the resorbed Posterior mandibular and maxillary Region of partially edentulous patients. Materials and Methods: Seventeen patients with one or more missing teeth at both sides in the Posterior Region were, according to a split-mouth design, randomly assigned to be treated with a platform-matched (control) implant on the one side and a platform-switched implant (test) on the other side. A total of 62 short implants (8.5mm) with a dual-acid etched surface with nanometer-sized calcium phosphate particles was placed. Follow-up visits were conducted one month and one year after placing the implant crown. Outcome measures were interproximal bone level changes, implant survival and clinical parameters. Results: One year after loading, peri-implant bone remodeling around test implants (0.530.54mm) was significant less than around control implants (0.85 +/- 0.65mm; p=.003). With regard to implant survival and clinical parameters no significant differences were observed between test and control implants. Conclusions: This study suggested that peri-implant bone remodeling is affected by platform switching. One year after loading, interproximal bone levels were better maintained at implants restored according to the platform switching concept.

  • short implants with a nanometer sized cap surface provided with either a platform switched or platform matched abutment connection in the Posterior Region a randomized clinical trial
    Clinical Oral Implants Research, 2013
    Co-Authors: Gerdien Telleman, Arjan Vissink, Hendrikus Meijer, Gerry M Raghoebar
    Abstract:

    Objective To assess the performance of short nanorough implants (8.5 mm in length) provided with either a platform-matched or a platform-switched implant–abutment connection, placed in the resorbed Posterior Region of partially dentate patients. Materials and Methods A total of 149 implants with a dual-acid surface and a discrete crystalline deposition of nanometer-sized CaP particles, with either a platform-matched (control) or a platform-switched implant–abutment connection (test) were placed (randomly assigned) in 92 patients. Follow-up visits were conducted 1 month and 1 year after placing the implant crown. Outcome measures were implant survival, radiographic peri-implant bone loss, clinical parameters, and patient's satisfaction. Results One year after loading, 6 of 76 implants in the control group (survival 92.1%) and 3 of 73 implants in the test group (survival 95.9%) were lost (P = 0.33). Radiographic bone loss around test implants (0.50 ± 0.53 mm) was significantly less than around control implants (0.74 ± 0.61 mm; P < 0.005). With regard to implant survival, clinical parameters, and patient's satisfaction, no significant differences were observed between test and control group. Conclusions For teeth replacements in the resorbed Posterior Region of partially dentate patients, short implants with a platform-switched implant–abutment connection showed significantly less peri-implant bone loss after 1 year in function, while implant survival, clinical parameters, and patient's satisfaction were independent of the implant–abutment connection design.

  • Short implants with a nanometer-sized CaP surface provided with either a platform-switched or platform-matched abutment connection in the Posterior Region: a randomized clinical trial.
    Clinical Oral Implants Research, 2012
    Co-Authors: Gerdien Telleman, Arjan Vissink, Hendrikus Meijer, Gerry M Raghoebar
    Abstract:

    Objective To assess the performance of short nanorough implants (8.5 mm in length) provided with either a platform-matched or a platform-switched implant–abutment connection, placed in the resorbed Posterior Region of partially dentate patients. Materials and Methods A total of 149 implants with a dual-acid surface and a discrete crystalline deposition of nanometer-sized CaP particles, with either a platform-matched (control) or a platform-switched implant–abutment connection (test) were placed (randomly assigned) in 92 patients. Follow-up visits were conducted 1 month and 1 year after placing the implant crown. Outcome measures were implant survival, radiographic peri-implant bone loss, clinical parameters, and patient's satisfaction. Results One year after loading, 6 of 76 implants in the control group (survival 92.1%) and 3 of 73 implants in the test group (survival 95.9%) were lost (P = 0.33). Radiographic bone loss around test implants (0.50 ± 0.53 mm) was significantly less than around control implants (0.74 ± 0.61 mm; P 

Urs Christoph Belser - One of the best experts on this subject based on the ideXlab platform.

  • a 10 year prospective study of iti dental implants placed in the Posterior Region i clinical and radiographic results
    Clinical Oral Implants Research, 2007
    Co-Authors: Rafael Juan Blanes, Jeanpierre Bernard, Zulema Maria Blanes, Urs Christoph Belser
    Abstract:

    Objectives: To evaluate the long-term fixture success rate, crestal bone loss and peri-implant soft tissue parameters around ITI dental implants placed in the Posterior Region of partially edentulous patients. Material and methods: A total of 192 ITI dental implants were consecutively placed in premolars and molars of 83 partially edentulous patients admitted for treatment at Geneva Dental School. All implants were restored by means of ceramic-to-metal fused fixed partial dentures and single crowns. Patients were followed as part of a prospective longitudinal study focusing on implant success. Surgical, radiographic and clinical variables were collected at the 1-year recall after implant placement and at the most recent clinical evaluation. Results: The mean observation time was 6 years (range 5–10 years). Four implants failed, yielding a 10-year cumulative survival rate of 97.9%. The mean annual crestal bone loss was −0.04±0.2 mm. Hollow-cylinder implants displayed more crestal bone loss (−0.13±0.24 mm) than hollow-screw implants (−0.02±0.19 mm; P=0.032). Clinical parameters such as age, gender, implant length and bone quality did not affect crestal bone levels. Increase in recession depth (P=0.025) and attachment level (P=0.011) were significantly associated with crestal bone loss. Conclusions: ITI dental implants placed in the Posterior jaw demonstrate excellent long-term clinical success. Hollow-cylinder implants seem to display a higher risk for crestal bone loss. Recession depth and attachment levels appear to be good clinical indicators of peri-implant bone loss.

  • A 10‐year prospective study of ITI dental implants placed in the Posterior Region. I: Clinical and radiographic results
    Clinical Oral Implants Research, 2007
    Co-Authors: Rafael Juan Blanes, Jeanpierre Bernard, Zulema Maria Blanes, Urs Christoph Belser
    Abstract:

    Objectives: To evaluate the long-term fixture success rate, crestal bone loss and peri-implant soft tissue parameters around ITI dental implants placed in the Posterior Region of partially edentulous patients. Material and methods: A total of 192 ITI dental implants were consecutively placed in premolars and molars of 83 partially edentulous patients admitted for treatment at Geneva Dental School. All implants were restored by means of ceramic-to-metal fused fixed partial dentures and single crowns. Patients were followed as part of a prospective longitudinal study focusing on implant success. Surgical, radiographic and clinical variables were collected at the 1-year recall after implant placement and at the most recent clinical evaluation. Results: The mean observation time was 6 years (range 5–10 years). Four implants failed, yielding a 10-year cumulative survival rate of 97.9%. The mean annual crestal bone loss was −0.04±0.2 mm. Hollow-cylinder implants displayed more crestal bone loss (−0.13±0.24 mm) than hollow-screw implants (−0.02±0.19 mm; P=0.032). Clinical parameters such as age, gender, implant length and bone quality did not affect crestal bone levels. Increase in recession depth (P=0.025) and attachment level (P=0.011) were significantly associated with crestal bone loss. Conclusions: ITI dental implants placed in the Posterior jaw demonstrate excellent long-term clinical success. Hollow-cylinder implants seem to display a higher risk for crestal bone loss. Recession depth and attachment levels appear to be good clinical indicators of peri-implant bone loss.

  • a 10 year prospective study of iti dental implants placed in the Posterior Region ii influence of the crown to implant ratio and different prosthetic treatment modalities on crestal bone loss
    Clinical Oral Implants Research, 2007
    Co-Authors: Rafael Juan Blanes, Jeanpierre Bernard, Zulema Maria Blanes, Urs Christoph Belser
    Abstract:

    Objective: To evaluate the influence of the crown-to-implant ratio (C/I) ratio and different implant prosthetic treatment modalities on crestal bone loss around dental implants placed in the Posterior Region. Material and methods: A total of 192 ITI dental implants were consecutively placed in premolars and molars of 83 partially edentulous patients. All implants were restored by means of ceramic-to-metal fused fixed partial dentures or a single crown. Patients were followed as part of a prospective longitudinal study focusing on implant success. Surgical, radiographic and clinical variables were collected at the 1-year recall after implant placement and at the most recent clinical evaluation. Radiographic parameters were evaluated on periapical radiographs taken with a standardized long-cone paralleling technique. Implant restorations were divided into three groups according to their respective clinical C/I ratios: (a) 0–0.99, (b) 1–1.99 and (c) ≥2. Results: The mean clinical C/I ratio was 1.77±0.56 mm. A total of 51 implants (26.5%) showed a clinical C/I ratio equal to or greater than 2. In this group, three implants failed, giving a cumulative survival rate of 94.1%. Crestal bone loss was −0.34±0.27 mm in group a, −0.03±0.15 mm in group b and −0.02±0.26 mm in group c. Differences among groups were statistically significant (P=0.009). Mode of retention, splinting or presence of cantilever extensions did not have an effect on crestal bone loss around ITI dental implants. Conclusions: Implant restorations with C/I ratios between 2 and 3 may be successfully used in the Posterior areas of the jaw.

  • A 10‐year prospective study of ITI dental implants placed in the Posterior Region. II: Influence of the crown‐to‐implant ratio and different prosthetic treatment modalities on crestal bone loss
    Clinical Oral Implants Research, 2007
    Co-Authors: Rafael Juan Blanes, Jeanpierre Bernard, Zulema Maria Blanes, Urs Christoph Belser
    Abstract:

    Objective: To evaluate the influence of the crown-to-implant ratio (C/I) ratio and different implant prosthetic treatment modalities on crestal bone loss around dental implants placed in the Posterior Region. Material and methods: A total of 192 ITI dental implants were consecutively placed in premolars and molars of 83 partially edentulous patients. All implants were restored by means of ceramic-to-metal fused fixed partial dentures or a single crown. Patients were followed as part of a prospective longitudinal study focusing on implant success. Surgical, radiographic and clinical variables were collected at the 1-year recall after implant placement and at the most recent clinical evaluation. Radiographic parameters were evaluated on periapical radiographs taken with a standardized long-cone paralleling technique. Implant restorations were divided into three groups according to their respective clinical C/I ratios: (a) 0–0.99, (b) 1–1.99 and (c) ≥2. Results: The mean clinical C/I ratio was 1.77±0.56 mm. A total of 51 implants (26.5%) showed a clinical C/I ratio equal to or greater than 2. In this group, three implants failed, giving a cumulative survival rate of 94.1%. Crestal bone loss was −0.34±0.27 mm in group a, −0.03±0.15 mm in group b and −0.02±0.26 mm in group c. Differences among groups were statistically significant (P=0.009). Mode of retention, splinting or presence of cantilever extensions did not have an effect on crestal bone loss around ITI dental implants. Conclusions: Implant restorations with C/I ratios between 2 and 3 may be successfully used in the Posterior areas of the jaw.

Arjan Vissink - One of the best experts on this subject based on the ideXlab platform.

  • four or six implants in the maxillary Posterior Region to support an overdenture 5 year results from a randomized controlled trial
    Clinical Oral Implants Research, 2019
    Co-Authors: Wim Slot, Gerry M Raghoebar, Arjan Vissink, Marco S Cune, Henny J A Meijer
    Abstract:

    Objective To compare clinical and patient-reported outcomes when providing maxillary overdentures on four bar- and six bar-connected implants placed in the Posterior Region during a 5-year follow-up period. Materials and methods Sixty-six fully edentulous patients with functional maxillary denture complaints and insufficient bone volume to allow implant placement were scheduled for a maxillary sinus floor elevation procedure with bone from the anterior iliac crest and randomized to receive either four or six implants in the Posterior maxilla and four implants in the mandible. After 3 months of osseointegration, a bar-supported overdenture was constructed. Maxillary implant survival, overdenture survival, clinical scores, peri-implant bone height changes and patient satisfaction were assessed. Results Sixty patients completed the 5-year follow-up. Implant survival was 100% in the four-implant group and 99.5% in the six-implant group. No new overdentures had to be made in the four-implant group, and three new overdentures were made in the six-implant group due to excessive wear of the denture base and teeth (90.9% overdenture survival). Clinical parameters did not differ significantly between groups. Mean marginal bone loss compared to baseline was 0.58 +/- 0.51 mm in the four-implant group and 0.60 +/- 0.58 mm in the six-implant group, respectively. Overall, patient satisfaction improved significantly, but did not differ between groups. Conclusion Following a bilateral maxillary sinus floor elevation procedure, a bar-supported overdenture on four implants in the Posterior maxillary Region is not inferior to an overdenture supported by six implants after a 5-year evaluation period in patients with functional maxillary denture complaints and marked Posterior resorption (Clinical trial registration number: NTR2969).

  • a comparison between 4 and 6 implants in the maxillary Posterior Region to support an overdenture 1 year results from a randomized controlled trial
    Clinical Oral Implants Research, 2014
    Co-Authors: Wim Slot, Gerry M Raghoebar, Arjan Vissink, Henny J A Meijer
    Abstract:

    Objective To compare the treatment outcome of 4 vs. 6bar-connected implants in the Posterior Region of the maxilla to support an overdenture during a 1-year follow-up period. Materials and methods Sixty-six edentulous patients with an insufficient amount of bone volume in the maxilla to place implants were asked to participate in this study. Randomization assigned patients to either 4 or 6 implants. In all patients, a maxillary sinus floor elevation procedure with bone from the iliac crest was performed, and after a 3-month healing period, 4 or 6 dental implants were inserted in the maxillary Posterior Region in a one-stage procedure. After 3months of osseointegration, a bar-supported overdenture was constructed. Implant survival, overdenture survival, clinical scores, peri-implant bone height changes and patients' satisfaction were assessed. Study analysis was performed according a non-inferiority design. Results All patients completed the one-year follow-up. After a functional period of 1-year, implant survival was 100% in the 4 implants group and 99.5% in the 6 implants group. Overdenture survival was 100% in both groups. Mean clinical scores were very low and did not significantly differ between groups. Mean marginal bone resorption was 0.35 +/- 0.31mm and 0.46 +/- 0.34mm in the 4 and 6 implants group, respectively. Patients' satisfaction improved significantly in both groups, but did not differ between groups. Conclusion A bar-supported overdenture on 4 implants in the Posterior maxillary Region is not inferior to an overdenture supported by 6bar-connected dental implants.

  • impact of platform switching on peri implant bone remodeling around short implants in the Posterior Region 1 year results from a split mouth clinical trial
    Clinical Implant Dentistry and Related Research, 2014
    Co-Authors: Gerdien Telleman, Gerry M Raghoebar, Arjan Vissink, Henny J A Meijer
    Abstract:

    Aim: To assess the effect of platform switching on peri-implant bone remodeling around short implants (8.5mm) placed in the resorbed Posterior mandibular and maxillary Region of partially edentulous patients. Materials and Methods: Seventeen patients with one or more missing teeth at both sides in the Posterior Region were, according to a split-mouth design, randomly assigned to be treated with a platform-matched (control) implant on the one side and a platform-switched implant (test) on the other side. A total of 62 short implants (8.5mm) with a dual-acid etched surface with nanometer-sized calcium phosphate particles was placed. Follow-up visits were conducted one month and one year after placing the implant crown. Outcome measures were interproximal bone level changes, implant survival and clinical parameters. Results: One year after loading, peri-implant bone remodeling around test implants (0.530.54mm) was significant less than around control implants (0.85 +/- 0.65mm; p=.003). With regard to implant survival and clinical parameters no significant differences were observed between test and control implants. Conclusions: This study suggested that peri-implant bone remodeling is affected by platform switching. One year after loading, interproximal bone levels were better maintained at implants restored according to the platform switching concept.

  • short implants with a nanometer sized cap surface provided with either a platform switched or platform matched abutment connection in the Posterior Region a randomized clinical trial
    Clinical Oral Implants Research, 2013
    Co-Authors: Gerdien Telleman, Arjan Vissink, Hendrikus Meijer, Gerry M Raghoebar
    Abstract:

    Objective To assess the performance of short nanorough implants (8.5 mm in length) provided with either a platform-matched or a platform-switched implant–abutment connection, placed in the resorbed Posterior Region of partially dentate patients. Materials and Methods A total of 149 implants with a dual-acid surface and a discrete crystalline deposition of nanometer-sized CaP particles, with either a platform-matched (control) or a platform-switched implant–abutment connection (test) were placed (randomly assigned) in 92 patients. Follow-up visits were conducted 1 month and 1 year after placing the implant crown. Outcome measures were implant survival, radiographic peri-implant bone loss, clinical parameters, and patient's satisfaction. Results One year after loading, 6 of 76 implants in the control group (survival 92.1%) and 3 of 73 implants in the test group (survival 95.9%) were lost (P = 0.33). Radiographic bone loss around test implants (0.50 ± 0.53 mm) was significantly less than around control implants (0.74 ± 0.61 mm; P < 0.005). With regard to implant survival, clinical parameters, and patient's satisfaction, no significant differences were observed between test and control group. Conclusions For teeth replacements in the resorbed Posterior Region of partially dentate patients, short implants with a platform-switched implant–abutment connection showed significantly less peri-implant bone loss after 1 year in function, while implant survival, clinical parameters, and patient's satisfaction were independent of the implant–abutment connection design.

  • Short implants with a nanometer-sized CaP surface provided with either a platform-switched or platform-matched abutment connection in the Posterior Region: a randomized clinical trial.
    Clinical Oral Implants Research, 2012
    Co-Authors: Gerdien Telleman, Arjan Vissink, Hendrikus Meijer, Gerry M Raghoebar
    Abstract:

    Objective To assess the performance of short nanorough implants (8.5 mm in length) provided with either a platform-matched or a platform-switched implant–abutment connection, placed in the resorbed Posterior Region of partially dentate patients. Materials and Methods A total of 149 implants with a dual-acid surface and a discrete crystalline deposition of nanometer-sized CaP particles, with either a platform-matched (control) or a platform-switched implant–abutment connection (test) were placed (randomly assigned) in 92 patients. Follow-up visits were conducted 1 month and 1 year after placing the implant crown. Outcome measures were implant survival, radiographic peri-implant bone loss, clinical parameters, and patient's satisfaction. Results One year after loading, 6 of 76 implants in the control group (survival 92.1%) and 3 of 73 implants in the test group (survival 95.9%) were lost (P = 0.33). Radiographic bone loss around test implants (0.50 ± 0.53 mm) was significantly less than around control implants (0.74 ± 0.61 mm; P 

Rosemary Sadami Arai Shinkai - One of the best experts on this subject based on the ideXlab platform.

  • risk factors for single crowns supported by short 6 mm implants in the Posterior Region a prospective clinical and radiographic study
    Clinical Implant Dentistry and Related Research, 2017
    Co-Authors: Eduardo Aydos Villarinho, Luis Andre Mezzomo, Diego Fernandes Triches, Fernando Rizzo Alonso, Eduardo Rolim Teixeira, Rosemary Sadami Arai Shinkai
    Abstract:

    Background The use of short implants is still not a consensus for challenging clinical situations, such as unfavorable crown-to-implant (C/I) ratio. Purpose This prospective study evaluated the rates of prosthetic complications and implant failure, the mean marginal bone loss of 6-mm dental implants with single crowns in Posterior Regions and the potential risk factors. Materials and Methods Forty-six dental implants, 6-mm long and 4.1-mm wide, were placed in the Posterior Region in 20 patients. Patients were clinically and radiographically examined after the restoration with single crowns and on a yearly basis. Potential risk factors (arch, bruxism, maximum bite force, anatomical and clinical C/I ratios, and occlusal table area) were analyzed according to the following outcomes: implant survival, bone loss, and prosthetic complications. Results The mean follow-up time was 45 ± 9 (16-57) months. There was no early loss of implants. After prosthetic loading, 4 implants were lost (2 in the mandible and 2 in the maxilla; 91.3% survival), and there were 13 prosthetic complications (28.3%), yielding a 65.2% success rate. The frailty term showed a 95% greater chance of loss in the mandible than the maxilla. Mean peri-implant bone loss was of 0.2 ± 0.4 mm, 0.1 ± 0.2 mm, 0.1 ± 0.3 mm, and 0.2 ± 0.4 mm in the first, second, third, and fourth years, respectively, with a mean cumulative loss of 0.3 ± 0.5 mm at 48 months. In the multilevel model, the effects of the clinical C/I ratio and time were significant for bone loss (P < .001). It was estimated that a mean bone loss of 0.1 mm is associated with both a one-unit increase in time (12 months) and a 0.1 increase in the clinical C/I ratio. The other potential risk factors showed no significant relationship with the outcomes. Conclusions The 6-mm implants supporting single crowns performed well, but the mandible shows a higher risk of failure. The time and clinical C/I ratio are predictors for bone loss.

  • Risk factors for single crowns supported by short (6‐mm) implants in the Posterior Region: A prospective clinical and radiographic study
    Clinical Implant Dentistry and Related Research, 2017
    Co-Authors: Eduardo Aydos Villarinho, Luis Andre Mezzomo, Diego Fernandes Triches, Fernando Rizzo Alonso, Eduardo Rolim Teixeira, Rosemary Sadami Arai Shinkai
    Abstract:

    Background The use of short implants is still not a consensus for challenging clinical situations, such as unfavorable crown-to-implant (C/I) ratio. Purpose This prospective study evaluated the rates of prosthetic complications and implant failure, the mean marginal bone loss of 6-mm dental implants with single crowns in Posterior Regions and the potential risk factors. Materials and Methods Forty-six dental implants, 6-mm long and 4.1-mm wide, were placed in the Posterior Region in 20 patients. Patients were clinically and radiographically examined after the restoration with single crowns and on a yearly basis. Potential risk factors (arch, bruxism, maximum bite force, anatomical and clinical C/I ratios, and occlusal table area) were analyzed according to the following outcomes: implant survival, bone loss, and prosthetic complications. Results The mean follow-up time was 45 ± 9 (16-57) months. There was no early loss of implants. After prosthetic loading, 4 implants were lost (2 in the mandible and 2 in the maxilla; 91.3% survival), and there were 13 prosthetic complications (28.3%), yielding a 65.2% success rate. The frailty term showed a 95% greater chance of loss in the mandible than the maxilla. Mean peri-implant bone loss was of 0.2 ± 0.4 mm, 0.1 ± 0.2 mm, 0.1 ± 0.3 mm, and 0.2 ± 0.4 mm in the first, second, third, and fourth years, respectively, with a mean cumulative loss of 0.3 ± 0.5 mm at 48 months. In the multilevel model, the effects of the clinical C/I ratio and time were significant for bone loss (P 

  • meta analysis of single crowns supported by short 10 mm implants in the Posterior Region
    Journal of Clinical Periodontology, 2014
    Co-Authors: Luis Andre Mezzomo, Rodrigo Miller, Diego Fernandes Triches, Fernando Rizzo Alonso, Rosemary Sadami Arai Shinkai
    Abstract:

    Aim: To assess the failures and complications of short (<10 mm) implants supporting single crowns in the Posterior Region and its potential risk factors (RkF). Materials and Methods: Prospective studies were screened according to eligibility criteria, followed by contact with authors. Quality assessment was performed using a standardized protocol. Mean implant failure proportion (FP), biological and prosthetic failure proportions (BFP/PFP) and marginal bone loss (MBL) including 95% confidence intervals were estimated using random-effects models for meta-analysis. Results: Sixteen studies with a medium methodological quality (mean score: 8 3; 2–14) had data collected. In summary, 762 short implants were followed up for up to 120 months in 360 patients (mean follow-up: 44 33.72 months; mean dropout rate: 5.1%). The means FP, BFP, PFP and MBL were 5.9% (95% CI: 3.7–9.2%), 3.8% (95%CI: 1.9–7.4%), 2.8% (95%CI: 1.4–5.7%) and 0.83 mm (95%CI: 0.54–1.12 mm) respectively. Quantitative analysis showed that placement in the mandible (p = 0.0002) and implants with length ≤ 8m m (p = 0.01) increased FP, BFP and MBL, whereas qualitative assessment revealed that crownto-implant ratio did not influence MBL. Conclusions: Single crowns supported by short implants in the Posterior Region are a predictable treatment option with reduced failure rates, biological/prosthetic complications and minimal bone loss.

Henny J A Meijer - One of the best experts on this subject based on the ideXlab platform.

  • four or six implants in the maxillary Posterior Region to support an overdenture 5 year results from a randomized controlled trial
    Clinical Oral Implants Research, 2019
    Co-Authors: Wim Slot, Gerry M Raghoebar, Arjan Vissink, Marco S Cune, Henny J A Meijer
    Abstract:

    Objective To compare clinical and patient-reported outcomes when providing maxillary overdentures on four bar- and six bar-connected implants placed in the Posterior Region during a 5-year follow-up period. Materials and methods Sixty-six fully edentulous patients with functional maxillary denture complaints and insufficient bone volume to allow implant placement were scheduled for a maxillary sinus floor elevation procedure with bone from the anterior iliac crest and randomized to receive either four or six implants in the Posterior maxilla and four implants in the mandible. After 3 months of osseointegration, a bar-supported overdenture was constructed. Maxillary implant survival, overdenture survival, clinical scores, peri-implant bone height changes and patient satisfaction were assessed. Results Sixty patients completed the 5-year follow-up. Implant survival was 100% in the four-implant group and 99.5% in the six-implant group. No new overdentures had to be made in the four-implant group, and three new overdentures were made in the six-implant group due to excessive wear of the denture base and teeth (90.9% overdenture survival). Clinical parameters did not differ significantly between groups. Mean marginal bone loss compared to baseline was 0.58 +/- 0.51 mm in the four-implant group and 0.60 +/- 0.58 mm in the six-implant group, respectively. Overall, patient satisfaction improved significantly, but did not differ between groups. Conclusion Following a bilateral maxillary sinus floor elevation procedure, a bar-supported overdenture on four implants in the Posterior maxillary Region is not inferior to an overdenture supported by six implants after a 5-year evaluation period in patients with functional maxillary denture complaints and marked Posterior resorption (Clinical trial registration number: NTR2969).

  • a comparison between 4 and 6 implants in the maxillary Posterior Region to support an overdenture 1 year results from a randomized controlled trial
    Clinical Oral Implants Research, 2014
    Co-Authors: Wim Slot, Gerry M Raghoebar, Arjan Vissink, Henny J A Meijer
    Abstract:

    Objective To compare the treatment outcome of 4 vs. 6bar-connected implants in the Posterior Region of the maxilla to support an overdenture during a 1-year follow-up period. Materials and methods Sixty-six edentulous patients with an insufficient amount of bone volume in the maxilla to place implants were asked to participate in this study. Randomization assigned patients to either 4 or 6 implants. In all patients, a maxillary sinus floor elevation procedure with bone from the iliac crest was performed, and after a 3-month healing period, 4 or 6 dental implants were inserted in the maxillary Posterior Region in a one-stage procedure. After 3months of osseointegration, a bar-supported overdenture was constructed. Implant survival, overdenture survival, clinical scores, peri-implant bone height changes and patients' satisfaction were assessed. Study analysis was performed according a non-inferiority design. Results All patients completed the one-year follow-up. After a functional period of 1-year, implant survival was 100% in the 4 implants group and 99.5% in the 6 implants group. Overdenture survival was 100% in both groups. Mean clinical scores were very low and did not significantly differ between groups. Mean marginal bone resorption was 0.35 +/- 0.31mm and 0.46 +/- 0.34mm in the 4 and 6 implants group, respectively. Patients' satisfaction improved significantly in both groups, but did not differ between groups. Conclusion A bar-supported overdenture on 4 implants in the Posterior maxillary Region is not inferior to an overdenture supported by 6bar-connected dental implants.

  • impact of platform switching on peri implant bone remodeling around short implants in the Posterior Region 1 year results from a split mouth clinical trial
    Clinical Implant Dentistry and Related Research, 2014
    Co-Authors: Gerdien Telleman, Gerry M Raghoebar, Arjan Vissink, Henny J A Meijer
    Abstract:

    Aim: To assess the effect of platform switching on peri-implant bone remodeling around short implants (8.5mm) placed in the resorbed Posterior mandibular and maxillary Region of partially edentulous patients. Materials and Methods: Seventeen patients with one or more missing teeth at both sides in the Posterior Region were, according to a split-mouth design, randomly assigned to be treated with a platform-matched (control) implant on the one side and a platform-switched implant (test) on the other side. A total of 62 short implants (8.5mm) with a dual-acid etched surface with nanometer-sized calcium phosphate particles was placed. Follow-up visits were conducted one month and one year after placing the implant crown. Outcome measures were interproximal bone level changes, implant survival and clinical parameters. Results: One year after loading, peri-implant bone remodeling around test implants (0.530.54mm) was significant less than around control implants (0.85 +/- 0.65mm; p=.003). With regard to implant survival and clinical parameters no significant differences were observed between test and control implants. Conclusions: This study suggested that peri-implant bone remodeling is affected by platform switching. One year after loading, interproximal bone levels were better maintained at implants restored according to the platform switching concept.