Microleakage and Marginal Integrity of Direct and Indirect Composite Resin Restorations in MOD Cavities After Thermo-Mechanical Loading

Objective: The aim of this in vitro study is to compare the microleakage mesial-occlusal-distal (MOD) composite resin restorations made by using CAD/CAM block and methacrylate/ormocer-based direct composites after thermo-mechanical loading.
 Methods: Standard 40 noncarious human third mandibular molars were selected for study. Standardized MOD (3x4x2mm) cavities prepared on mesial distal sides. gingival margin was placed above cementoenamel junction (CEJ) side below CEJ side. samples divided into three experimental groups [indirect group-GrandioBlock (GB), direct-methacrylate group-TetricN-Ceram+TetricN-Flow (T+TF), direct-ormocer group-Admira Fusion+Admira Fusion Flow (A+AF)] control group [direct-methacrylate group-GrandioSo+GrandioSoFlow (G+GF)] (n=10). After finishing subjected 50 N 240.000 cycles (5-55°C, 60 sec) kept 0.2% methylene blue. Samples sectioned longitudinally mesiodistal direction with a precision cutting device examined under stereomicroscope at X8 X25 values scored. In evaluation data, descriptive statistical methods as well chi-square test used comparison qualitative data.
 Results: No significant difference found among coronal gingival-enamel distributions (p>0.05). A statistically observed gingival-cementum (p=0.003). distribution gingival-cement no dye penetration score T+TF be significantly lower than G+GF GB (p = 0.010, p 0.001).
 Conclusion: Under limitation study; restoring different matrix structures could not eliminate leakage seat CEJ.