II. sınıf adeziv restorasyonlarda farklı materyallerin ve restorasyon yöntemlerinin mikrosızıntı açısından in vitro değerlendirilmesi

Abstract

Aim and purpose: The aim of this in vitro study was to evaluate the effects of different placement techniques and different restorative techniques on the microleakage with tooth clearing method in Class II cavities. Materials and method: Class II slot cavities (randomized on mesial or distal surfaces, 4 mm width, 5 mm height and 2 mm depth) were prepared on 50 sound nonerupted human third molars. The cavities were bonded with Scotchbond MP etch-and-rinse adhesive (3M ESPE) and were randomly divided into 5 groups (n = 10) according to the restorative techniques. Filtek Ultimate Universal nanohybrid composite and Filtek Ultimate Flow (3M ESPE) were used to restore all cavities. Group 1: Bulk, Group 2: Horizontal, Group 3: Oblique, Group 4: Horizontal, Indirect Polymerization (on replica), Luting with Flowable Composite, Group 5: Oblique, Indirect Polymerization (on replica), Luting with Flowable Composite. The specimens were thermocycled (500x) and immersed in 50% silver nitrate solution for 24 h. Microleakage on the gingival and proximal walls were evaluated with a stereomicroscope and calculated in the form of area after the application of decalcification and clearing method. Data were analyzed with Kruskal-Wallis and Mann-Whitney U-test (p < 0.001). Results: Placement techniques and the usage of indirect polymerisation luted with flowable composite significantly reduced microleakage. There was no significant difference between the placement techniques but less microleakage scores were determined by using oblique placement technique. The significant fewer microleakage scores were determined in the Group 4 and Group 5. Summary and conclusions: Microleakage was observed in all groups. Indirect polymerisation technique combined with flowable composite were reduced microleakage.