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Chung Chen Jane Yao - One of the best experts on this subject based on the ideXlab platform.
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Revisiting the stability of mini-implants used for Orthodontic Anchorage
Journal of the Formosan Medical Association = Taiwan yi zhi, 2014Co-Authors: Chung Chen Jane Yao, Hao-hueng Chang, Jenny Zwei-chieng Chang, Hsiang-hua Lai, Yi Jane ChenAbstract:Background/Purpose The aim of this study is to comprehensively analyze the potential factors affecting the failure rates of three types of mini-implants used for Orthodontic Anchorage. Methods Data were collected on 727 mini-implants (miniplates, predrilled titanium miniscrews, and self-drilling stainless steel miniscrews) in 220 patients. The factors related to mini-implant failure were investigated using a Chi-square test for univariate analysis and a generalized estimating equation model for multivariate analysis. Results The failure rate for miniplates was significantly lower than for miniscrews. All types of mini-implants, especially the self-drilling stainless steel miniscrews, showed decreased stability if the previous implantation had failed. The stability of predrilled titanium miniscrews and self-drilling stainless steel miniscrews were comparable at the first implantation. However, the failure rate of stainless steel miniscrews increased at the second implantation. The univariate analysis showed that the following variables had a significant influence on the failure rates of mini-implants: age of patient, type of mini-implant, site of implantation, and characteristics of the soft tissue around the mini-implants. The generalized estimating equation analysis revealed that mini-implants with miniscrews used in patients younger than 35 years, subjected to Orthodontic loading after 30 days and implanted on the alveolar bone ridge, have a significantly higher risk of failure. Conclusion This study revealed that once the dental surgeon becomes familiar with the procedure, the stability of Orthodontic mini-implants depends on the type of mini-implant, age of the patient, implantation site, and the healing time of the mini-implant. Miniplates are a more feasible Anchorage system when miniscrews fail repeatedly.
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Stability of miniplates and miniscrews used for Orthodontic Anchorage: Experience with 492 temporary Anchorage devices
Clinical Oral Implants Research, 2008Co-Authors: Yi Jane Chen, Hsing Yi Lin, Eddie Hsian Hua Lai, Hsin Chia Hung, Hao-hueng Chang, Chung Chen Jane YaoAbstract:OBJECTIVES: The aim of this retrospective study was to evaluate systematically the potential factors that influence failure rates of temporary Anchorage devices (TADs) used for Orthodontic Anchorage. MATERIALS AND METHODS: Data on 492 TADs (miniplates, pre-drilling miniscrews, and self-drilling miniscrews) in 194 patients were collected. The factors related to TAD failure were evaluated using univariate analysis and multivariate forward stepwise logistic regression analysis. RESULTS: There were no significant differences in failure rates among the TADs for the following variables: gender, type of malocclusion, facial divergency, implantation site (buccal, lingual, or crestal/midpalatal), location (anterior or posterior), method of force application (power chain or Ni-Ti coil spring), arch (upper or lower), type of soft tissue (attached gingiva or removable mucosa), and most of the cephalometric measurements that reflect dento-cranio-facial characteristics. An increased failure rate was noted for the self-drilling miniscrew type of TAD, TADs used for tooth uprighting, those inserted on bone with lower density, those associated with local inflammation of the surrounding soft tissue, those loaded within 3 weeks after insertion, and those placed in patients with greater mandibular retrusion. Failure rates of the self-drilling miniscrews installed by an oral surgeon and by an orthodontist did not differ significantly. CONCLUSIONS: Inflammation of soft tissue surrounding a TAD and early loading within 3 weeks after insertion were the most significant factors predicting TAD failure. Both orthodontists and oral surgeons who install Orthodontic TADs must undergo sufficient training to achieve clinical excellence.
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Removal torque of miniscrews used for Orthodontic Anchorage--a preliminary report.
The International journal of oral & maxillofacial implants, 2006Co-Authors: Yi Jane Chen, Yuan-hou Chen, Li-deh Lin, Chung Chen Jane YaoAbstract:PURPOSE Implant anchors such as miniscrews and miniplates have been loaded immediately for Anchorage during Orthodontic treatment. The purpose of this study was to measure the removal torque of immediately loaded miniscrews after clinical usage and to determine the possible factors associated with this value. MATERIALS AND METHODS From 29 patients with malocclusions, 46 miniscrews were removed, and removal torque was measured with a torque gauge. Removal torque values were subjected to statistical analysis for possible association of different clinical characteristics. RESULTS The mean removal torque value was 1.10 kg x cm, and removal torques for 50% of the implants were greater than 0.89 kg x cm (8.7 N x cm). Removal torque values were significantly higher in the mandible than in the maxilla. The removal torques of 15-mm and 17-mm miniscrews were significantly higher than those of 13-mm miniscrews. Therefore, the site of implantation and miniscrew length were important factors associated with removal torque. However, there was no significant correlation between the removal torque value and age, gender, healing time, or time in function. DISCUSSION When miniscrews are used as Anchorage for uprighting tipped molars, excessive torque in a counterclockwise direction may loosen them. From the measurements obtained in this investigation, miniscrews can sufficiently sustain an uprighting moment. CONCLUSION The removal torque values of the majority of miniscrews in this study population when loaded immediately as Orthodontic Anchorage were greater than 0.89 kg x cm, and this was sufficient for these implants to fulfill their purpose as anchors in 3-dimensional tooth movements.
Teruko Takano-yamamoto - One of the best experts on this subject based on the ideXlab platform.
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Combined maxillary and mandibular midline and mandibular ramus distraction osteogenesis for treatment of a Class II patient with implants as Orthodontic Anchorage
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists its constituent socie, 2010Co-Authors: Ichiro Takahashi, Hiroshi Kawamura, Teruko Takano-yamamotoAbstract:This case report describes the treatment of a woman with severe mandibular retrusion and maxillomandibular transverse deficiency. Her malocclusion was characterized by a large overjet, a deep overbite, and a V-shaped dental arch, and she had a skeletal Class II profile. Treatement included combined maxillary and mandibular midline expansion, maxillary downward repositioning, and mandibular ramus lengthening with distraction osteogenesis with implants as Orthodontic Anchorage. During the postdistraction Orthodontic treatment period, some skeletal relapse occurred. Implants provided absolute Orthodontic Anchorage to overcome the unexpected skeletal changes. Combined Orthodontic treatment with implants for Anchorage and distraction osteogenesis successfully expanded the maxilla and the mandible and corrected the mandibular deficiency. Two-year follow-up records show a morphologically and functionally stable result.
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Histomorphometric study of alveolar bone-implant (miniscrew) interface used as an Orthodontic Anchorage
Interface Oral Health Science 2009, 2010Co-Authors: Toru Deguchi, Masakazu Hasegawa, Masahiro Seiryu, Takayoshi Daimaruya, Teruko Takano-yamamotoAbstract:The use of miniscrews as an Orthodontic Anchorage has become widely accepted among orthodontists throughout the world. However, only few histological studies have been reported with regard to the healing process at the bone-implant interface in the past. Therefore, we have (1) analyzed the healing process of alveolar bone surrounding miniscrew by dynamic and static histomorphometric indices and (2) histomorphometrically assessed the change in the cortical bone thickness. Results indicated that small miniscrews were able to function as rigid osseous Anchorage against Orthodontic load with minimal (under 3 weeks) healing period. We suggest that this sufficient amount of cortical (woven) bone at the initial stage of the healing enables the immediate loading in miniscrews to resist against Orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible compared to the maxilla.
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Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for Orthodontic Anchorage.
Clinical implant dentistry and related research, 2009Co-Authors: Toru Deguchi, W. Eugene Roberts, Masakazu Hasegawa, Toshinori Yabuuchi, Lawrence P. Garetto, Teruko Takano-yamamotoAbstract:Background: Recently, the use of miniscrews as an Anchorage device has become a routine approach in the Orthodontic field. However, there is no report that has analyzed the healing process of the miniscrew, such as the thickness of the cortical bone, in the past. Purpose: In the present study, to histologically assess the healing process of the osseous tissue surrounding miniscrews used as an Orthodontic Anchorage, the change in the thickness of the cortical bone was analyzed after 3, 6, and 12 weeks after the placement. Furthermore, the change in the bone-implant contact in different regions of the miniscrew during the initial healing period was also investigated. Materials and Methods: Ninety-six miniscrews were placed in eight beagle dogs. After 3, 6, and 12 weeks of healing, a force of 200–300 g was applied to the force-applied groups for 12 weeks. Non-forced groups remained in the jaw without force application. Results: In the non-forced groups, a significant amount of cortical bone was formed at the head of the miniscrew at the initial stage of the healing process in the maxilla. However, less cortical bone formation was observed in the mandible. After the force application, increased bone formation was observed within 1 mm of the miniscrew compared to other regions in both jaws. In the mandible, significantly less cortical bone was observed 3 and 6 weeks after the force application. Bone-implant contact revealed that the osseous tissue surrounding the miniscrew matured from the apex toward the head of the miniscrew. Conclusion: We suggest that this sufficient amount of cortical bone at the initial stage of healing enables the immediate loading in miniscrews to resist against Orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible.
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Clinical use of miniscrew implants as Orthodontic Anchorage: Success rates and postoperative discomfort
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists its constituent socie, 2007Co-Authors: Shingo Kuroda, Hee-moon Kyung, Toru Deguchi, Yasuyo Sugawara, Teruko Takano-yamamotoAbstract:Introduction: In this study, we evaluated the clinical usefulness of miniscrews as Orthodontic Anchorage. We examined their success rates, analyzed factors associated with their stability, and evaluated patients’ postoperative pain and discomfort with a retrospective questionnaire. Methods: Seventy-five patients, 116 titanium screws of 2 types, and 38 miniplates were retrospectively examined. Each patient was given a questionnaire that included a visual analog scale to indicate discomfort after implantation. Results: The success rate for each type of implant was greater than 80%. The analysis of 79 miniscrews with a 1.3-mm diameter showed no significant correlations between success rate and these variables: age, sex, mandibular plane angle, anteroposterior jaw-base relationship, control of periodontitis, temporomandibular disorder symptoms, loading, and screw length. Most patients receiving titanium screws or miniplates with mucoperiosteal-flap surgery reported pain, but half of the patients receiving miniscrews without flap surgery did not report feeling pain at any time after placement. In addition, patients with miniscrews reported minimal discomfort due to swelling, speech difficulty, and difficulty in chewing. Conclusions: Miniscrews placed without flap surgery have high success rates with less pain and discomfort after surgery than miniscrews placed with flap surgery or miniplates placed with either procedure.
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Root proximity is a major factor for screw failure in Orthodontic Anchorage.
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists its constituent socie, 2007Co-Authors: Shingo Kuroda, Hee-moon Kyung, Kazuyo Yamada, Toru Deguchi, Takashi Hashimoto, Teruko Takano-yamamotoAbstract:The purpose of this study was to evaluate root proximity as a risk factor for the failure of miniscrews used as Orthodontic Anchorage. We used dental radiographs and 3-dimensional computed tomography images to examine 216 titanium screws in 110 patients. Each screw was classified according to its proximity to the adjacent root. Category I, the screw was absolutely separate from the root; category II, the apex of the screw appeared to touch the lamina dura; and category III, the body of the screw was overlaid on the lamina dura. If the Orthodontic force could be applied to the screw for 1 year (or until completion of Orthodontic treatment), we recorded the screw Anchorage as a success. The screws had a high success rate--above 80%. Screws placed in the maxilla had a significantly higher success rate than those in the mandible. There was a significant correlation between success rate and root proximity. There were significant differences in the success rates between categories I and II, I and III, and II and III. Although screws in all 3 categories in the maxilla and categories I and II in the mandible showed high success rates above 75%, screws in category III in the mandible had a low success rate of 35%. The proximity of a miniscrew to the root is a major risk factor for the failure of screw Anchorage. This tendency is more obvious in the mandible.
Yi Jane Chen - One of the best experts on this subject based on the ideXlab platform.
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Revisiting the stability of mini-implants used for Orthodontic Anchorage
Journal of the Formosan Medical Association = Taiwan yi zhi, 2014Co-Authors: Chung Chen Jane Yao, Hao-hueng Chang, Jenny Zwei-chieng Chang, Hsiang-hua Lai, Yi Jane ChenAbstract:Background/Purpose The aim of this study is to comprehensively analyze the potential factors affecting the failure rates of three types of mini-implants used for Orthodontic Anchorage. Methods Data were collected on 727 mini-implants (miniplates, predrilled titanium miniscrews, and self-drilling stainless steel miniscrews) in 220 patients. The factors related to mini-implant failure were investigated using a Chi-square test for univariate analysis and a generalized estimating equation model for multivariate analysis. Results The failure rate for miniplates was significantly lower than for miniscrews. All types of mini-implants, especially the self-drilling stainless steel miniscrews, showed decreased stability if the previous implantation had failed. The stability of predrilled titanium miniscrews and self-drilling stainless steel miniscrews were comparable at the first implantation. However, the failure rate of stainless steel miniscrews increased at the second implantation. The univariate analysis showed that the following variables had a significant influence on the failure rates of mini-implants: age of patient, type of mini-implant, site of implantation, and characteristics of the soft tissue around the mini-implants. The generalized estimating equation analysis revealed that mini-implants with miniscrews used in patients younger than 35 years, subjected to Orthodontic loading after 30 days and implanted on the alveolar bone ridge, have a significantly higher risk of failure. Conclusion This study revealed that once the dental surgeon becomes familiar with the procedure, the stability of Orthodontic mini-implants depends on the type of mini-implant, age of the patient, implantation site, and the healing time of the mini-implant. Miniplates are a more feasible Anchorage system when miniscrews fail repeatedly.
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Stability of miniplates and miniscrews used for Orthodontic Anchorage: Experience with 492 temporary Anchorage devices
Clinical Oral Implants Research, 2008Co-Authors: Yi Jane Chen, Hsing Yi Lin, Eddie Hsian Hua Lai, Hsin Chia Hung, Hao-hueng Chang, Chung Chen Jane YaoAbstract:OBJECTIVES: The aim of this retrospective study was to evaluate systematically the potential factors that influence failure rates of temporary Anchorage devices (TADs) used for Orthodontic Anchorage. MATERIALS AND METHODS: Data on 492 TADs (miniplates, pre-drilling miniscrews, and self-drilling miniscrews) in 194 patients were collected. The factors related to TAD failure were evaluated using univariate analysis and multivariate forward stepwise logistic regression analysis. RESULTS: There were no significant differences in failure rates among the TADs for the following variables: gender, type of malocclusion, facial divergency, implantation site (buccal, lingual, or crestal/midpalatal), location (anterior or posterior), method of force application (power chain or Ni-Ti coil spring), arch (upper or lower), type of soft tissue (attached gingiva or removable mucosa), and most of the cephalometric measurements that reflect dento-cranio-facial characteristics. An increased failure rate was noted for the self-drilling miniscrew type of TAD, TADs used for tooth uprighting, those inserted on bone with lower density, those associated with local inflammation of the surrounding soft tissue, those loaded within 3 weeks after insertion, and those placed in patients with greater mandibular retrusion. Failure rates of the self-drilling miniscrews installed by an oral surgeon and by an orthodontist did not differ significantly. CONCLUSIONS: Inflammation of soft tissue surrounding a TAD and early loading within 3 weeks after insertion were the most significant factors predicting TAD failure. Both orthodontists and oral surgeons who install Orthodontic TADs must undergo sufficient training to achieve clinical excellence.
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Removal torque of miniscrews used for Orthodontic Anchorage--a preliminary report.
The International journal of oral & maxillofacial implants, 2006Co-Authors: Yi Jane Chen, Yuan-hou Chen, Li-deh Lin, Chung Chen Jane YaoAbstract:PURPOSE Implant anchors such as miniscrews and miniplates have been loaded immediately for Anchorage during Orthodontic treatment. The purpose of this study was to measure the removal torque of immediately loaded miniscrews after clinical usage and to determine the possible factors associated with this value. MATERIALS AND METHODS From 29 patients with malocclusions, 46 miniscrews were removed, and removal torque was measured with a torque gauge. Removal torque values were subjected to statistical analysis for possible association of different clinical characteristics. RESULTS The mean removal torque value was 1.10 kg x cm, and removal torques for 50% of the implants were greater than 0.89 kg x cm (8.7 N x cm). Removal torque values were significantly higher in the mandible than in the maxilla. The removal torques of 15-mm and 17-mm miniscrews were significantly higher than those of 13-mm miniscrews. Therefore, the site of implantation and miniscrew length were important factors associated with removal torque. However, there was no significant correlation between the removal torque value and age, gender, healing time, or time in function. DISCUSSION When miniscrews are used as Anchorage for uprighting tipped molars, excessive torque in a counterclockwise direction may loosen them. From the measurements obtained in this investigation, miniscrews can sufficiently sustain an uprighting moment. CONCLUSION The removal torque values of the majority of miniscrews in this study population when loaded immediately as Orthodontic Anchorage were greater than 0.89 kg x cm, and this was sufficient for these implants to fulfill their purpose as anchors in 3-dimensional tooth movements.
Toru Deguchi - One of the best experts on this subject based on the ideXlab platform.
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the use of miniscrew as Orthodontic Anchorage in correction of maxillary protrusion with occlusal cant spaced arch and midline deviation without surgery
Orthodontics The Art and Practice of Dentofacial Enhancement, 2013Co-Authors: Ryo Komori, Toru Deguchi, Ryo Tomizuka, Teruko TakanoyamamotoAbstract:This report describes the use of the miniscrew as Orthodontic Anchorage in maxillary protrusion with a spaced arch and midline deviation in a 16-year-old female patient. In cases with midline deviation, a cant in the maxillary occlusal plane is often observed. Thus, the authors used the miniscrew to control the vertical dimension, thereby flattening the maxillary occlusal plane, and to close and retract the incisors to improve her convex profile. Effective incisor intrusion to correct the deep overbite was also observed. In addition, functional evaluation by a 6-degrees-of-freedom jaw movement recording system was performed. Significant improvement in the jaw movement was observed during maximum opening and lateral excursion during the retention phase. The authors suggest that miniscrews are effective in correcting midline deviation due to maxillary occlusal cant and intrusion and retraction of incisors, and may result in favorable functional movement of the jaw.
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Histomorphometric study of alveolar bone-implant (miniscrew) interface used as an Orthodontic Anchorage
Interface Oral Health Science 2009, 2010Co-Authors: Toru Deguchi, Masakazu Hasegawa, Masahiro Seiryu, Takayoshi Daimaruya, Teruko Takano-yamamotoAbstract:The use of miniscrews as an Orthodontic Anchorage has become widely accepted among orthodontists throughout the world. However, only few histological studies have been reported with regard to the healing process at the bone-implant interface in the past. Therefore, we have (1) analyzed the healing process of alveolar bone surrounding miniscrew by dynamic and static histomorphometric indices and (2) histomorphometrically assessed the change in the cortical bone thickness. Results indicated that small miniscrews were able to function as rigid osseous Anchorage against Orthodontic load with minimal (under 3 weeks) healing period. We suggest that this sufficient amount of cortical (woven) bone at the initial stage of the healing enables the immediate loading in miniscrews to resist against Orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible compared to the maxilla.
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Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for Orthodontic Anchorage.
Clinical implant dentistry and related research, 2009Co-Authors: Toru Deguchi, W. Eugene Roberts, Masakazu Hasegawa, Toshinori Yabuuchi, Lawrence P. Garetto, Teruko Takano-yamamotoAbstract:Background: Recently, the use of miniscrews as an Anchorage device has become a routine approach in the Orthodontic field. However, there is no report that has analyzed the healing process of the miniscrew, such as the thickness of the cortical bone, in the past. Purpose: In the present study, to histologically assess the healing process of the osseous tissue surrounding miniscrews used as an Orthodontic Anchorage, the change in the thickness of the cortical bone was analyzed after 3, 6, and 12 weeks after the placement. Furthermore, the change in the bone-implant contact in different regions of the miniscrew during the initial healing period was also investigated. Materials and Methods: Ninety-six miniscrews were placed in eight beagle dogs. After 3, 6, and 12 weeks of healing, a force of 200–300 g was applied to the force-applied groups for 12 weeks. Non-forced groups remained in the jaw without force application. Results: In the non-forced groups, a significant amount of cortical bone was formed at the head of the miniscrew at the initial stage of the healing process in the maxilla. However, less cortical bone formation was observed in the mandible. After the force application, increased bone formation was observed within 1 mm of the miniscrew compared to other regions in both jaws. In the mandible, significantly less cortical bone was observed 3 and 6 weeks after the force application. Bone-implant contact revealed that the osseous tissue surrounding the miniscrew matured from the apex toward the head of the miniscrew. Conclusion: We suggest that this sufficient amount of cortical bone at the initial stage of healing enables the immediate loading in miniscrews to resist against Orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible.
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root proximity is a major factor for screw failure in Orthodontic Anchorage
American Journal of Orthodontics and Dentofacial Orthopedics, 2007Co-Authors: Shingo Kuroda, Hee-moon Kyung, Kazuyo Yamada, Toru Deguchi, Teruko Takano YamamotoAbstract:Introduction The purpose of this study was to evaluate root proximity as a risk factor for the failure of miniscrews used as Orthodontic Anchorage. Methods We used dental radiographs and 3-dimensional computed tomography images to examine 216 titanium screws in 110 patients. Each screw was classified according to its proximity to the adjacent root. Category I, the screw was absolutely separate from the root; category II, the apex of the screw appeared to touch the lamina dura; and category III, the body of the screw was overlaid on the lamina dura. If the Orthodontic force could be applied to the screw for 1 year (or until completion of Orthodontic treatment), we recorded the screw Anchorage as a success. Results The screws had a high success rate—above 80%. Screws placed in the maxilla had a significantly higher success rate than those in the mandible. There was a significant correlation between success rate and root proximity. There were significant differences in the success rates between categories I and II, I and III, and II and III. Although screws in all 3 categories in the maxilla and categories I and II in the mandible showed high success rates above 75%, screws in category III in the mandible had a low success rate of 35%. Conclusions The proximity of a miniscrew to the root is a major risk factor for the failure of screw Anchorage. This tendency is more obvious in the mandible.
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Clinical use of miniscrew implants as Orthodontic Anchorage: Success rates and postoperative discomfort
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists its constituent socie, 2007Co-Authors: Shingo Kuroda, Hee-moon Kyung, Toru Deguchi, Yasuyo Sugawara, Teruko Takano-yamamotoAbstract:Introduction: In this study, we evaluated the clinical usefulness of miniscrews as Orthodontic Anchorage. We examined their success rates, analyzed factors associated with their stability, and evaluated patients’ postoperative pain and discomfort with a retrospective questionnaire. Methods: Seventy-five patients, 116 titanium screws of 2 types, and 38 miniplates were retrospectively examined. Each patient was given a questionnaire that included a visual analog scale to indicate discomfort after implantation. Results: The success rate for each type of implant was greater than 80%. The analysis of 79 miniscrews with a 1.3-mm diameter showed no significant correlations between success rate and these variables: age, sex, mandibular plane angle, anteroposterior jaw-base relationship, control of periodontitis, temporomandibular disorder symptoms, loading, and screw length. Most patients receiving titanium screws or miniplates with mucoperiosteal-flap surgery reported pain, but half of the patients receiving miniscrews without flap surgery did not report feeling pain at any time after placement. In addition, patients with miniscrews reported minimal discomfort due to swelling, speech difficulty, and difficulty in chewing. Conclusions: Miniscrews placed without flap surgery have high success rates with less pain and discomfort after surgery than miniscrews placed with flap surgery or miniplates placed with either procedure.
André Büchter - One of the best experts on this subject based on the ideXlab platform.
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success rate of mini and micro implants used for Orthodontic Anchorage a prospective clinical study
Clinical Oral Implants Research, 2007Co-Authors: Dirk Wiechmann, Ulrich Meyer, André BüchterAbstract:Objectives: Whereas micro-implants have become a useful alternative as Orthodontic Anchorage elements in Orthodontics, less is known about the clinical effectiveness of micro-implants. The aim of this prospective clinical study was to evaluate the success rate of micro-implants used for Orthodontic Anchorage. Material and methods: A total of 133 mini-implants (79 Abso Anchor, 54 Dual Top implants) placed in 49 patients to support Orthodontic tooth movements were examined in the study. The majority of the implants were placed in the maxilla (82), followed by the vestibular (42) and lingual (nine) aspect of the mandible. Results: An overall cumulative survival rate of 86.8% (102/133) was found by Kaplan–Meier analysis. The failure rate between Dual Top implants (13%) and Abso Anchor implants (30.4%) differed significantly (P=0.0196; log-rank test). The cumulative failure rate of implants was found to be significantly higher when implants were placed in the lingual aspect of the mandible compared with the other localizations (P=0.0011; log-rank test). Clinical evaluation revealed successful dental movements when implants remained stable during the Orthodontic therapy. Conclusions: The present results confirm the effectiveness of Orthodontic micro-implants used as Anchorage elements.
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Success rate of mini‐ and micro‐implants used for Orthodontic Anchorage: a prospective clinical study
Clinical oral implants research, 2007Co-Authors: Dirk Wiechmann, Ulrich Meyer, André BüchterAbstract:Objectives: Whereas micro-implants have become a useful alternative as Orthodontic Anchorage elements in Orthodontics, less is known about the clinical effectiveness of micro-implants. The aim of this prospective clinical study was to evaluate the success rate of micro-implants used for Orthodontic Anchorage. Material and methods: A total of 133 mini-implants (79 Abso Anchor, 54 Dual Top implants) placed in 49 patients to support Orthodontic tooth movements were examined in the study. The majority of the implants were placed in the maxilla (82), followed by the vestibular (42) and lingual (nine) aspect of the mandible. Results: An overall cumulative survival rate of 86.8% (102/133) was found by Kaplan–Meier analysis. The failure rate between Dual Top implants (13%) and Abso Anchor implants (30.4%) differed significantly (P=0.0196; log-rank test). The cumulative failure rate of implants was found to be significantly higher when implants were placed in the lingual aspect of the mandible compared with the other localizations (P=0.0011; log-rank test). Clinical evaluation revealed successful dental movements when implants remained stable during the Orthodontic therapy. Conclusions: The present results confirm the effectiveness of Orthodontic micro-implants used as Anchorage elements.