Perbandingan tingkat kebocoran mikro resin komposit bulk-filldengan teknik penumpatan oblique incremental dan bulk

Abstract

Resin composite bulk-? ll was a new type of resin composite that speed up application process of composite. The concept of bulk-? ll composite allows composite to ? ll at a depth of 4 mm and minimizes polymerization shrinkage. This study aims to determine the comparison of placement techniques (oblique incremental/bulk) of bulk-? ll composite on microleakage in class I preparations. Thirty two human maxillary premolar were stored in distilled water, then Class I preparations were made with the depth of the cavity which was 4 mm (3 x 3 x 4). The teeth were randomly divided into two groups, group 1 uses oblique incremental placement technique and group 2 with bulk placement technique. Samples were stored in an incubator at a temperature of 37 °C for 24 hours, then it was thermocycled manually, 100 cycles at temperature between 5 °C and 55 °C. Microleakage was measured using a digital microscope with a 100 X magni? cation in millimeters using a microscope micrometer calibration ruler with 0,1 mm level of accuracy after immersion in 0,3% methylene blue and sectioned using separating disc. The result of this study revealed that in group 1 microleakage range was 1.0 mm - 2.7 mm with an average 1.625 mm, and in group 2 microleakage range was 3.6 mm - 4.0 mm with an average of 3.763 mm. The data were analyzed using T-test. The analysis showed a signi? cant difference between two groups (p <0.05). The conclusion of this study was bulk-? ll composite in class I cavities with oblique incremental placement technique produces less microleakage than bulk placement technique.