Browsing by Author "Siso, Seyda Herguner"

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Citation Count: 0
The Effects of Thermo-mechanical Aging on Microleakage in Composite Restorations Polymerized Using One New Generation and Two Conventional Led Light Curing Units
(Bezmialem Vakif Univ, 2021) Donmez, Nazmiye; Uslu, Yesim Sesen; Siso, Seyda Herguner; Toprak, Ali
Objective: This study aimed to evaluate the effects of thermomechanical aging (TMA) on the microleakage scores of Class V composite restorations polymerized using one new generational and two conventional light emitting diodes (LED) light curing units (LCU). Methods: Class V cavities were prepared and restored on the buccal and lingual surfaces of 60 extracted human premolar teeth using a dental phantom head to simulate clinical conditions. After application of the adhesive system (Optibond Solo Plus, Kerr, USA) using total etch procedures. the cavities were restored with composite resin (Herculite XRV. Kerr, USA) using one new generational (Demi Ultracapacitor, Kerr, USA) and two conventional (Valo Cordless, USA and BA Optima International, UK) LED light devices. The restored teeth were then subdivided into the test (underwent TMA) and control (did not undergo TMA) groups, and the specimens were stained with 0.5% basic fuchsin dye and sectioned. Dye penetration was scored using a stereomicroscope at 40x magnification. Differences between groups were compared using the Kruskal-Wallis, Mann-Whitney U, and Wilcoxon Signed Ranks tests (p<0.05). Results: Comparison of the test and control groups by the LCUs used for polymerization showed a statistically significant difference in microleakage scores between the two (p<0.05). However, no differences in scores were observed between the new generational and two conventional LED LCUs (p>0.05). Conclusion: Thermal and mechanical aging procedures increased microlcakage in Class V composite estorations, regardless of the light curing unit used.
Citation Count: 0
MARGINAL MICROLEAKAGE OF GLASS IONOMER BASED RESTORATIONS AFTER CONVENTIONAL CAVITY PREPARATION AND ER: YAG LASER IRRADIATION
(Dokuz Eylul Univ inst Health Sciences, 2022) Kaynar, Zeynep Buket; Donmez, Nazmiye; Siso, Seyda Herguner
Purpose: Assessing the microleakage of glass ionomer restorations (GIC) prepared with both conventional and Er:YAG laser techniques in Class V cavities is the purpose of the study.Material and Methods: Twenty teeth with Class V cavities (4mm wide, 3mm high, 3mm deep) were used. Cavities were prepared on the buccal and lingual surfaces of teeth which were randomly separated into four groups. Er:YAG laser was used to prepare cavities in Groups II and IV, conventionally diamond bur was used to prepare cavities in Groups I and III. Then, Groups I and II were restored with conventional GIC (Ketac Molar Easymix, 3MEspe, Seefeld, Germany) and high viscosity GIC with resin coating (EQUIA Fil, GC Dental Co., Tokyo, Japan) to restore Groups III and IV. Samples were stored in distilled water at 37 degrees C for 24 hours before subjecting to thermo-cycling (500 cycles,5 degrees C-55 degrees C). In a chewing simulator, all teeth were exposed to 50.000 cycles. We used 0.5% aqueous basic fuchsin dye to stain the samples and sectioned them bucco-lingually. Scoring dye penetration was made under a stereomicroscope. The data were analyzed by Kruskal-Wallis One-Way ANOVA and Mann-Whitney U tests.Results: While the highest microleakage scores were obtained in the group prepared with Er: YAG laser and restored with conventional GIC the lowest microleakage scores were obtained in the group prepared with Er:YAG laser and restored with high viscosity GIC. When cavities prepared with Er:YAG laser or conventional method were restored with high viscosity GIC, no statistically significant difference was found between them (p> 0.05).Conclusion: High viscosity GIC can be preferred as a restorative material in the restorations of Class V cavities prepared using both conventional and Er:YAG lasers.