The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
Youngkyung Ko - One of the best experts on this subject based on the ideXlab platform.
-
effects of Titanium brush on machined and sand blasted acid etched Titanium Disc using confocal microscopy and contact profilometry
Clinical Oral Implants Research, 2015Co-Authors: Junbeom Park, Yongpyo Jeon, Youngkyung KoAbstract:OBJECTIVE: Mechanical techniques, including scaling with metal, plastic, or ultrasonic instruments, rubber cup polishing, air-powder abrasive system and brushing with a conventional or a rotating brush, have been used for the debridement of dental implants. Recently, rotating brushes with Titanium bristles (Titanium brush) have been introduced for the debridement of implant surface when peri-implant osseous defects occur. The purpose of this study was to evaluate the effects of a Titanium brush on machined (MA) and sand-blasted and acid-etched (SA) Titanium surfaces using scanning electron microscopy, confocal microscopy and profilometry. Moreover, correlations between the two quantitative evaluation methods (confocal microscopy and contact profilometry) were assessed. MATERIALS AND METHODS: Both MA and SA Discs were treated with rotating Titanium brush at 300 rpm under irrigation for a total of 40 s. Roughness measurements were taken with confocal microscopy and surface profilometry. Then, the MA and SA surfaces were evaluated using scanning electron microscopy to determine the changes of the surface properties. RESULTS: Untreated MA surface demonstrated uniform roughness with circumferential machining marks, and scratch lines over the original surfaces were observed after treatment with the Titanium brush. Similarly, the Titanium brush produced noticeable changes on the SA Titanium surfaces. However, this treatment with Titanium brush did not significantly change the roughness parameters, including the arithmetic mean height of the surface (Sa) and the maximum height of the surface (Sz), in both MA and SA surfaces. Correlations between two evaluation methods showed a Pearson correlation coefficient of 0.98 with linear regression R(2) of 0.96. CONCLUSION: This study showed that the treatment with the Titanium brush did not significantly change the roughness parameters, including Sa and Sz, in both MA and SA surfaces. Correlations between confocal microscopy and surface profilometry showed high correlation with a Pearson correlation coefficient of 0.98.
-
effects of ultrasonic scaler tips and toothbrush on Titanium Disc surfaces evaluated with confocal microscopy
Journal of Craniofacial Surgery, 2012Co-Authors: Junbeom Park, Youngkyung KoAbstract:PURPOSE: Instrumentation to remove plaque from dental implants may cause damage to the implant surface, and previous studies that have evaluated the effects of the ultrasonic scalers and brushing in experimental settings reported that substantial changes were seen on implant surfaces after mechanical plaque removal. There is limited information on changes of the surface profile and roughness of sandblasted acid-etched (SLA) and machined Titanium surfaces after treatment with different instruments in simulated clinical situations. The purpose of this study was to evaluate the effects of oral hygiene instruments including various types of ultrasonic tips in simulated clinical settings and brushing with dentifrice on machined and SLA Titanium surface with confocal microscopy. METHODS: Both SLA and machined Discs were treated with various ultrasonic scaler tips and brushing. Discs were either instrumented with 4 different ultrasonic scaler tips or brushed with dentifrice. The entire top surface of the Discs was instrumented for a total of 40 seconds (20 seconds, 2 cycles). Brushing with dentifrice was done for 40 seconds. Roughness measurements were performed using a confocal microscope. RESULTS: The change of surface structure after different treatment modalities could be observed with the naked eye when compared with the untreated surface (SLA and machined groups). In case of SLA surfaces, the 2 metal tips produced greater changes on the Titanium surfaces when compared with the plastic ultrasonic tips and brushing. On the machined Discs, scratch lines over the original surfaces could be observed from all ultrasonic metal and plastic tips, but 2 metal tips produced significant and definite scratches on the original Disc surfaces. CONCLUSIONS: This study showed the effects of different types of ultrasonic tips and brushing with dentifrice on both SLA and machined Titanium surfaces in simulated clinical setting. Within the limits of our study, we suggest that metal or plastic ultrasonic scaler tips may be applied as usual to treat the SLA surface of dental abutment or fixture surfaces without increasing the irregularities on the Titanium surfaces. However, in case of machined surfaces, ultrasonic metal tips cannot be recommended because the surface becomes rougher after treatment. In addition, brushing of Titanium, regardless of surface treatment (SLA and machined surfaces), resulted in reduction of surface roughness. Meticulous oral hygiene with brushing must be reinforced for the patients with dental implants to maintain the exposed implant surface clean. Brushing with dentifrice may facilitate maintaining the exposed fixture surface clean by smoothening the surface.
Flávia Magnani Bevilacqua - One of the best experts on this subject based on the ideXlab platform.
-
Machined Titanium Disc decontamination using photodynamic therapy: an in vitro study
Revista de Ciências Médicas, 2012Co-Authors: Oswaldo Biondi Filho, Patrícia Fernanda Roesler Bertolini, Flávia Magnani BevilacquaAbstract:Objective This study investigated less invasive protocols that do not injure peri-implant tissues during implant surface decontamination and evaluated, in vitro, the efficacy of microbiological decontamination of machined surface Titanium Discs with photodynamic therapy. Methods Forty eight Titanium Disc contaminated with 10μL of a Streptococcus sanguinis suspension were randomly divided into groups: 1) Titanium Disc contaminated with Ss (Titanium Disc suspension) without treatment; 2) Titanium Disc suspension rinsed with saline solution; 3) Titanium Disc suspension rinsed with 0.2% chlorhexidine digluconate; 4) Titanium Disc suspension treated with Photosensitizer Methilene Blue; 5) Titanium Disc suspension treated with Photosensitizer Methilene Blue associated with laser diode; 6) Titanium Disc suspension treated with diode laser. After the treatments, the Titanium Disc were submersed in 3mL of sterile brain-heart infusion broth under aerobic conditions at 37oC for 48 hours. Three petri plates were seeded per sample and maintained under aerobic conditions at 37oC for 48 hours, after which the number of colony forming units per milliliter was counted. Results The Kruskal-Wallis test complemented by Dunn test showed that chlorhexidine digluconate eliminated Titanium Disc contamination (p
-
machined Titanium Disc decontamination using photodynamic therapy an in vitro study
Revista de Ciências Médicas, 2012Co-Authors: Oswaldo Biondi Filho, Patrícia Fernanda Roesler Bertolini, Flávia Magnani BevilacquaAbstract:Objective This study investigated less invasive protocols that do not injure peri-implant tissues during implant surface decontamination and evaluated, in vitro, the efficacy of microbiological decontamination of machined surface Titanium Discs with photodynamic therapy. Methods Forty eight Titanium Disc contaminated with 10μL of a Streptococcus sanguinis suspension were randomly divided into groups: 1) Titanium Disc contaminated with Ss (Titanium Disc suspension) without treatment; 2) Titanium Disc suspension rinsed with saline solution; 3) Titanium Disc suspension rinsed with 0.2% chlorhexidine digluconate; 4) Titanium Disc suspension treated with Photosensitizer Methilene Blue; 5) Titanium Disc suspension treated with Photosensitizer Methilene Blue associated with laser diode; 6) Titanium Disc suspension treated with diode laser. After the treatments, the Titanium Disc were submersed in 3mL of sterile brain-heart infusion broth under aerobic conditions at 37oC for 48 hours. Three petri plates were seeded per sample and maintained under aerobic conditions at 37oC for 48 hours, after which the number of colony forming units per milliliter was counted. Results The Kruskal-Wallis test complemented by Dunn test showed that chlorhexidine digluconate eliminated Titanium Disc contamination (p<0.05). All the other groups (2, 4, 5, 6) had fewer colony-forming units than group 1 (p<0.05). Conclusion Within the limitations of this study, Photodynamic Therapy reduced Titanium Disc contamination but was not better than 0.2 % chlorhexidine digluconate rinsing. Indexing terms : Chlorhexidine. Implant. Laser. Titanium.
Junbeom Park - One of the best experts on this subject based on the ideXlab platform.
-
effects of Titanium brush on machined and sand blasted acid etched Titanium Disc using confocal microscopy and contact profilometry
Clinical Oral Implants Research, 2015Co-Authors: Junbeom Park, Yongpyo Jeon, Youngkyung KoAbstract:OBJECTIVE: Mechanical techniques, including scaling with metal, plastic, or ultrasonic instruments, rubber cup polishing, air-powder abrasive system and brushing with a conventional or a rotating brush, have been used for the debridement of dental implants. Recently, rotating brushes with Titanium bristles (Titanium brush) have been introduced for the debridement of implant surface when peri-implant osseous defects occur. The purpose of this study was to evaluate the effects of a Titanium brush on machined (MA) and sand-blasted and acid-etched (SA) Titanium surfaces using scanning electron microscopy, confocal microscopy and profilometry. Moreover, correlations between the two quantitative evaluation methods (confocal microscopy and contact profilometry) were assessed. MATERIALS AND METHODS: Both MA and SA Discs were treated with rotating Titanium brush at 300 rpm under irrigation for a total of 40 s. Roughness measurements were taken with confocal microscopy and surface profilometry. Then, the MA and SA surfaces were evaluated using scanning electron microscopy to determine the changes of the surface properties. RESULTS: Untreated MA surface demonstrated uniform roughness with circumferential machining marks, and scratch lines over the original surfaces were observed after treatment with the Titanium brush. Similarly, the Titanium brush produced noticeable changes on the SA Titanium surfaces. However, this treatment with Titanium brush did not significantly change the roughness parameters, including the arithmetic mean height of the surface (Sa) and the maximum height of the surface (Sz), in both MA and SA surfaces. Correlations between two evaluation methods showed a Pearson correlation coefficient of 0.98 with linear regression R(2) of 0.96. CONCLUSION: This study showed that the treatment with the Titanium brush did not significantly change the roughness parameters, including Sa and Sz, in both MA and SA surfaces. Correlations between confocal microscopy and surface profilometry showed high correlation with a Pearson correlation coefficient of 0.98.
-
effects of ultrasonic scaler tips and toothbrush on Titanium Disc surfaces evaluated with confocal microscopy
Journal of Craniofacial Surgery, 2012Co-Authors: Junbeom Park, Youngkyung KoAbstract:PURPOSE: Instrumentation to remove plaque from dental implants may cause damage to the implant surface, and previous studies that have evaluated the effects of the ultrasonic scalers and brushing in experimental settings reported that substantial changes were seen on implant surfaces after mechanical plaque removal. There is limited information on changes of the surface profile and roughness of sandblasted acid-etched (SLA) and machined Titanium surfaces after treatment with different instruments in simulated clinical situations. The purpose of this study was to evaluate the effects of oral hygiene instruments including various types of ultrasonic tips in simulated clinical settings and brushing with dentifrice on machined and SLA Titanium surface with confocal microscopy. METHODS: Both SLA and machined Discs were treated with various ultrasonic scaler tips and brushing. Discs were either instrumented with 4 different ultrasonic scaler tips or brushed with dentifrice. The entire top surface of the Discs was instrumented for a total of 40 seconds (20 seconds, 2 cycles). Brushing with dentifrice was done for 40 seconds. Roughness measurements were performed using a confocal microscope. RESULTS: The change of surface structure after different treatment modalities could be observed with the naked eye when compared with the untreated surface (SLA and machined groups). In case of SLA surfaces, the 2 metal tips produced greater changes on the Titanium surfaces when compared with the plastic ultrasonic tips and brushing. On the machined Discs, scratch lines over the original surfaces could be observed from all ultrasonic metal and plastic tips, but 2 metal tips produced significant and definite scratches on the original Disc surfaces. CONCLUSIONS: This study showed the effects of different types of ultrasonic tips and brushing with dentifrice on both SLA and machined Titanium surfaces in simulated clinical setting. Within the limits of our study, we suggest that metal or plastic ultrasonic scaler tips may be applied as usual to treat the SLA surface of dental abutment or fixture surfaces without increasing the irregularities on the Titanium surfaces. However, in case of machined surfaces, ultrasonic metal tips cannot be recommended because the surface becomes rougher after treatment. In addition, brushing of Titanium, regardless of surface treatment (SLA and machined surfaces), resulted in reduction of surface roughness. Meticulous oral hygiene with brushing must be reinforced for the patients with dental implants to maintain the exposed implant surface clean. Brushing with dentifrice may facilitate maintaining the exposed fixture surface clean by smoothening the surface.
Oswaldo Biondi Filho - One of the best experts on this subject based on the ideXlab platform.
-
Machined Titanium Disc decontamination using photodynamic therapy: an in vitro study
Revista de Ciências Médicas, 2012Co-Authors: Oswaldo Biondi Filho, Patrícia Fernanda Roesler Bertolini, Flávia Magnani BevilacquaAbstract:Objective This study investigated less invasive protocols that do not injure peri-implant tissues during implant surface decontamination and evaluated, in vitro, the efficacy of microbiological decontamination of machined surface Titanium Discs with photodynamic therapy. Methods Forty eight Titanium Disc contaminated with 10μL of a Streptococcus sanguinis suspension were randomly divided into groups: 1) Titanium Disc contaminated with Ss (Titanium Disc suspension) without treatment; 2) Titanium Disc suspension rinsed with saline solution; 3) Titanium Disc suspension rinsed with 0.2% chlorhexidine digluconate; 4) Titanium Disc suspension treated with Photosensitizer Methilene Blue; 5) Titanium Disc suspension treated with Photosensitizer Methilene Blue associated with laser diode; 6) Titanium Disc suspension treated with diode laser. After the treatments, the Titanium Disc were submersed in 3mL of sterile brain-heart infusion broth under aerobic conditions at 37oC for 48 hours. Three petri plates were seeded per sample and maintained under aerobic conditions at 37oC for 48 hours, after which the number of colony forming units per milliliter was counted. Results The Kruskal-Wallis test complemented by Dunn test showed that chlorhexidine digluconate eliminated Titanium Disc contamination (p
-
machined Titanium Disc decontamination using photodynamic therapy an in vitro study
Revista de Ciências Médicas, 2012Co-Authors: Oswaldo Biondi Filho, Patrícia Fernanda Roesler Bertolini, Flávia Magnani BevilacquaAbstract:Objective This study investigated less invasive protocols that do not injure peri-implant tissues during implant surface decontamination and evaluated, in vitro, the efficacy of microbiological decontamination of machined surface Titanium Discs with photodynamic therapy. Methods Forty eight Titanium Disc contaminated with 10μL of a Streptococcus sanguinis suspension were randomly divided into groups: 1) Titanium Disc contaminated with Ss (Titanium Disc suspension) without treatment; 2) Titanium Disc suspension rinsed with saline solution; 3) Titanium Disc suspension rinsed with 0.2% chlorhexidine digluconate; 4) Titanium Disc suspension treated with Photosensitizer Methilene Blue; 5) Titanium Disc suspension treated with Photosensitizer Methilene Blue associated with laser diode; 6) Titanium Disc suspension treated with diode laser. After the treatments, the Titanium Disc were submersed in 3mL of sterile brain-heart infusion broth under aerobic conditions at 37oC for 48 hours. Three petri plates were seeded per sample and maintained under aerobic conditions at 37oC for 48 hours, after which the number of colony forming units per milliliter was counted. Results The Kruskal-Wallis test complemented by Dunn test showed that chlorhexidine digluconate eliminated Titanium Disc contamination (p<0.05). All the other groups (2, 4, 5, 6) had fewer colony-forming units than group 1 (p<0.05). Conclusion Within the limitations of this study, Photodynamic Therapy reduced Titanium Disc contamination but was not better than 0.2 % chlorhexidine digluconate rinsing. Indexing terms : Chlorhexidine. Implant. Laser. Titanium.
G H Nancollas - One of the best experts on this subject based on the ideXlab platform.
-
controlled bioactivation of Titanium Disc a constant composition kinetic approach
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015Co-Authors: Timothy J Halter, Ballav Moni Borah, G H NancollasAbstract:Abstract Titanium is widely used in orthopedic applications. To improve osseointegration, the surface composition and topography of pure Titanium is often modified to impart bioactivity. These surface modifications typically involve coating Titanium in a calcium phosphate mineral layer. This work presents a unique method for the well-controlled bioactivation of Titanium Discs. Using the constant composition (CC) method combined with scanning electron microscopy (SEM) Ca-P mineralization on Titanium surfaces was studied across a range of thermodynamic driving forces (σ), and the effects of both KOH and NaOH used in the alkali treatment were investigated. Our findings indicate that the use of KOH in the alkali treatment of Titanium Discs is more effective in forming a fibrous titanate layer. The formation of a titanate layer promotes the formation of ocotacalcium phosphate [Ca 8 H 2 (PO 4 ) 6 .5H 2 O, OCP] coating directly bound to the Disc surface. These findings highlight importance of the alkali metal chosen in the base treatment of titantium Discs, a critical step in several bioactivation processes.