Yazd Journal of Dental Research

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Ataei E, Modaber M, Daneshkazemi A R, Ersi M. Investigating General Dentists' Viewpoint Regarding Prescription of Panoramic Radiography in Yazd in 2012. YJDR 2014; 2 (1) :24-37
URL: http://yjdr.ssu.ac.ir/article-1-23-en.html

Introduction: This in vitro study aimed to compare two filling techniques and the effect of retention groove on microleakage of siloran and methacrylate based composites. methods: class V cavities (3×4×1.5×mm) were prepared on the buccal and lingual surfaces in 48 extracted human premolars. The cavities were restored with two different types of composites 1) silorane-based resin composite (Filtek™ P90 Silorane, 3M ESPE) with its dedicated adhesive system(P90 system adhesive) and, 2) methacrylate-based resin composite(Z250,3M ESPE) with clearfil SE bond adhesive resin system. Each of these two groups was then subdivided into four groups (12 restoration). G1: with retentive groove- incremental G2: without retentive groove- incremental G3: with retentive groove- bulky G4: without retentive groove- bulky .The retentive grooves were placed at the axio- occlusal and axio-gingival line angles. The teeth were subjected to thermocycling regime (500×, 5-55°C) and were stained with 2% methylene blue dye and then were sectioned and viewed under a stereomicroscope. Data were analyzed with Kruskal-Wallis and Mann-Whitney U test via SPSS.17 software. Results: there was no significant difference between the filling technique and cavity preparation in methacrylate-base resin composite (P> 0.05). However, a significant difference was found in siloran-based resin composite (P= 0.000). Within group pairs of siloran-based composite, there was a significant difference between the G1 and G3, G1 and G4, G2 and G4. Conclusions: The base of composite had no effect on microleakage, though combination of layering restotative technique and groove placement resulted in lower microleakage in both methacrylate and silorane composites. However, in methacrylate composite, the decrease was not significant.