Yakup Üstün - Academia.edu (original) (raw)

Papers by Yakup Üstün

Research paper thumbnail of Effects of Dissolving Solutions on the Accuracy of an Electronic Apex Locator-Integrated Endodontic Handpiece

The Scientific World Journal, 2013

The effects of three dissolving agents on the accuracy of an electronic apex locator- (EAL-) inte... more The effects of three dissolving agents on the accuracy of an electronic apex locator- (EAL-) integrated endodontic handpiece during retreatment procedures were evaluated. The true lengths (TLs) of 56 extracted incisor teeth were determined visually. Twenty teeth were filled with gutta-percha and a resin-based sealer (group A), 20 with gutta-percha and a zinc oxide/eugenol-based sealer (group B), and 16 roots were used as the control group (group C). All roots were prepared to TL. Guttasolv, Resosolv, and Endosolv E were used as the dissolving solutions. Two evaluations of the handpiece were performed: the apical accuracy during the auto reverse function (ARL) and the apex locator function (EL) alone. The ARL function of the handpiece gave acceptable results. There were significant differences between the EL mode measurements and the TL (P<0.05). In these comparisons, Tri Auto ZX EL mode measurements were significantly shorter than those of the TL.

Research paper thumbnail of Retreatment of Root Canal Fillings Performed with a Calcium Silicate Based Root Canal Sealer and Gutta-Percha with Different Root Canal Solvents

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, 2015

G3: Guttasolv. 35/.04 K3 instruments were used as the final retreatment instruments. Final irriga... more G3: Guttasolv. 35/.04 K3 instruments were used as the final retreatment instruments. Final irrigation was performed and root canals were dried. The teeth were split along their long axis and operating microscope at 10x magnification was used to evaluate the amount of remaining root filling material. Samples were then scored. SEM and EDS analysis were used to enhance the accuracy of evaluations. Data were subjected to statistical interpretation using Kruskal-Wallis test at a 95% confidence level (p<0.05). Results: There were no statistically significant differences among the three experimental groups in the apical, middle and coronal thirds of the root canals (p>0.05). Intra group comparisons showed that apical, middle and coronal thirds of each group showed no significant differences among themselves (p>0.05). Conclusion: Root fillings performed with MTA Fillapex® and gutta percha could be retreated with the solvents used in the study.

Research paper thumbnail of Push-out bond strength of two new calcium silicate-based endodontic sealers to root canal dentine

International Endodontic Journal, 2011

Sagsen B, Ustü n Y, Demirbuga S, Pala K. Push-out bond strength of two new calcium silicate-based... more Sagsen B, Ustü n Y, Demirbuga S, Pala K. Push-out bond strength of two new calcium silicate-based endodontic sealers to root canal dentine.

Research paper thumbnail of Resistance to fracture of roots filled with different sealers

Dental Materials Journal, 2012

The aim of this study was to compare the fracture resistance of roots fi lled with gutta percha (... more The aim of this study was to compare the fracture resistance of roots fi lled with gutta percha (GP) and different root canal sealers. Fifty-fi ve human maxillary central incisors were selected and randomly divided into three experimental groups (Groups 1-3) and two control groups (Groups 4 and 5). They were Group 1-15 root canals fi lled with an epoxy resin-based sealer (AH Plus) and GP, Group 2-15 root canals fi lled with a calcium silicate-based sealer (iRoot SP) and GP, Group 3: 15 root canals fi lled with another calcium silicate-based sealer (MTA Fillapex) and GP, Group 4: fi ve roots were instrumented but not fi lled, and Group 5: fi ve roots were neither instrumented nor fi lled. Compressive loading was carried out using a universal testing machine until fracture occurred. Force applied at time of fracture was recorded as fracture strength of specimen in Newtons. There were no signifi cant differences in fracture strength among the three experimental groups (p>0.05), whose results were signifi cantly superior to that of Group 4 (p<0.05). In conclusion, all the root canal sealers used in the present study increased the fracture resistance of instrumented root canals.

Research paper thumbnail of Effects of different cavity disinfectants on shear bond strength of a silorane-based resin composite

The Journal of Contemporary Dental Practice, 2011

AIM: This in vitro study evaluated the effect of different cavity disinfection agents on bond str... more AIM: This in vitro study evaluated the effect of different cavity disinfection agents on bond strength of a silorane-based resin composite.MATERIALS AND METHODS: Thirty-six caries-free human third mandibular molars sectioned in mesio-distal direction were mounted in acrylic resin with their flat dentin surfaces exposed. After the dentin surfaces were wet ground with # 600 silicon carbide paper, the teeth were randomly divided into 6 groups of 12 each according to the cavity disinfection agents; chlorhexidine (CHX); sodium hypochlorite (NaOCl), propolis, ozone, Er,Cr:YSGG laser and no treatment (control). After treatment of dentin surfaces with one of these cavity disinfection agents, Filtek Silorane adhesive system was applied. The silorane-based resin composite, Filtek Silorane was condensed into a mold and polymerized. After storage at 37°C for 24 hours, the specimens were tested in shear mode at a crosshead speed of 1.0 mm/minute. The results were analyzed by one-way ANOVA.RESULTS: No statistically significant difference was observed between the groups (p>0.05).CONCLUSION: The use of the tested cavity disinfection agents, chlorhexidine, sodium hypochlorite, propolis, ozone and Er,Cr:YSGG laser did not significantly affect the dentin bond strength of a silorane-based resin composite, filtek supreme.CLINICAL SIGNIFICANCE: Cavity disinfectant applications did not affect the dentin bond strength of a silorane-based resin composite.

Research paper thumbnail of Effects of Dissolving Solutions on the Accuracy of an Electronic Apex Locator-Integrated Endodontic Handpiece

The Scientific World Journal, 2013

The effects of three dissolving agents on the accuracy of an electronic apex locator- (EAL-) inte... more The effects of three dissolving agents on the accuracy of an electronic apex locator- (EAL-) integrated endodontic handpiece during retreatment procedures were evaluated. The true lengths (TLs) of 56 extracted incisor teeth were determined visually. Twenty teeth were filled with gutta-percha and a resin-based sealer (group A), 20 with gutta-percha and a zinc oxide/eugenol-based sealer (group B), and 16 roots were used as the control group (group C). All roots were prepared to TL. Guttasolv, Resosolv, and Endosolv E were used as the dissolving solutions. Two evaluations of the handpiece were performed: the apical accuracy during the auto reverse function (ARL) and the apex locator function (EL) alone. The ARL function of the handpiece gave acceptable results. There were significant differences between the EL mode measurements and the TL (P<0.05). In these comparisons, Tri Auto ZX EL mode measurements were significantly shorter than those of the TL.

Research paper thumbnail of Retreatment of Root Canal Fillings Performed with a Calcium Silicate Based Root Canal Sealer and Gutta-Percha with Different Root Canal Solvents

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, 2015

G3: Guttasolv. 35/.04 K3 instruments were used as the final retreatment instruments. Final irriga... more G3: Guttasolv. 35/.04 K3 instruments were used as the final retreatment instruments. Final irrigation was performed and root canals were dried. The teeth were split along their long axis and operating microscope at 10x magnification was used to evaluate the amount of remaining root filling material. Samples were then scored. SEM and EDS analysis were used to enhance the accuracy of evaluations. Data were subjected to statistical interpretation using Kruskal-Wallis test at a 95% confidence level (p<0.05). Results: There were no statistically significant differences among the three experimental groups in the apical, middle and coronal thirds of the root canals (p>0.05). Intra group comparisons showed that apical, middle and coronal thirds of each group showed no significant differences among themselves (p>0.05). Conclusion: Root fillings performed with MTA Fillapex® and gutta percha could be retreated with the solvents used in the study.

Research paper thumbnail of Push-out bond strength of two new calcium silicate-based endodontic sealers to root canal dentine

International Endodontic Journal, 2011

Sagsen B, Ustü n Y, Demirbuga S, Pala K. Push-out bond strength of two new calcium silicate-based... more Sagsen B, Ustü n Y, Demirbuga S, Pala K. Push-out bond strength of two new calcium silicate-based endodontic sealers to root canal dentine.

Research paper thumbnail of Resistance to fracture of roots filled with different sealers

Dental Materials Journal, 2012

The aim of this study was to compare the fracture resistance of roots fi lled with gutta percha (... more The aim of this study was to compare the fracture resistance of roots fi lled with gutta percha (GP) and different root canal sealers. Fifty-fi ve human maxillary central incisors were selected and randomly divided into three experimental groups (Groups 1-3) and two control groups (Groups 4 and 5). They were Group 1-15 root canals fi lled with an epoxy resin-based sealer (AH Plus) and GP, Group 2-15 root canals fi lled with a calcium silicate-based sealer (iRoot SP) and GP, Group 3: 15 root canals fi lled with another calcium silicate-based sealer (MTA Fillapex) and GP, Group 4: fi ve roots were instrumented but not fi lled, and Group 5: fi ve roots were neither instrumented nor fi lled. Compressive loading was carried out using a universal testing machine until fracture occurred. Force applied at time of fracture was recorded as fracture strength of specimen in Newtons. There were no signifi cant differences in fracture strength among the three experimental groups (p>0.05), whose results were signifi cantly superior to that of Group 4 (p<0.05). In conclusion, all the root canal sealers used in the present study increased the fracture resistance of instrumented root canals.

Research paper thumbnail of Effects of different cavity disinfectants on shear bond strength of a silorane-based resin composite

The Journal of Contemporary Dental Practice, 2011

AIM: This in vitro study evaluated the effect of different cavity disinfection agents on bond str... more AIM: This in vitro study evaluated the effect of different cavity disinfection agents on bond strength of a silorane-based resin composite.MATERIALS AND METHODS: Thirty-six caries-free human third mandibular molars sectioned in mesio-distal direction were mounted in acrylic resin with their flat dentin surfaces exposed. After the dentin surfaces were wet ground with # 600 silicon carbide paper, the teeth were randomly divided into 6 groups of 12 each according to the cavity disinfection agents; chlorhexidine (CHX); sodium hypochlorite (NaOCl), propolis, ozone, Er,Cr:YSGG laser and no treatment (control). After treatment of dentin surfaces with one of these cavity disinfection agents, Filtek Silorane adhesive system was applied. The silorane-based resin composite, Filtek Silorane was condensed into a mold and polymerized. After storage at 37°C for 24 hours, the specimens were tested in shear mode at a crosshead speed of 1.0 mm/minute. The results were analyzed by one-way ANOVA.RESULTS: No statistically significant difference was observed between the groups (p>0.05).CONCLUSION: The use of the tested cavity disinfection agents, chlorhexidine, sodium hypochlorite, propolis, ozone and Er,Cr:YSGG laser did not significantly affect the dentin bond strength of a silorane-based resin composite, filtek supreme.CLINICAL SIGNIFICANCE: Cavity disinfectant applications did not affect the dentin bond strength of a silorane-based resin composite.