An in vitro evaluation of microleakage in class V preparations restored with Hybrid versus Silorane composites

Abstract

Aim:To compare the difference in microleakage values using conventional and new low-shrink Silorane composites using the dye penetration method.Background:With improvement in adhesive technology, problems associated with composites have been largely overcome. However, microleakage due to polymerization shrinkage still remains a challenge. New Silorane-based composites are alleged to have less than 1% polymerization shrinkage, which would potentially decrease the microleakage, and hence, resolve this longstanding issue.Materials and Methods:The teeth were randomly divided into three groups (A,B, and C). Group A was restored with conventional composite (Valux™ Plus), with a total-etch protocol, Group B was restored with conventional composite, with a self-etch protocol, and group C were restored with a silorane-based composite (Filtek TMP90). Thermocycling at 200 cycles between 5 and 55°C ± 2°C with a dwell time of 60 seconds was conducted. The teeth were stained with methylene blue dye and then sectioned and viewed under a dissection microscope, afer which the microleakage was evaluated.Results:The interexaminer reliability was evaluated using the kappa score, which was acceptable (61 – 78%). The total-etch group performed statistically and significantly better (P < 0.001) at the occlusal margin and was marginally and statistically significant (P = 0.05) at the gingival margin compared to the self-etch conventional and Silorane groups.Conclusions:The Silorane composite did not perform better than the conventional composites, however, it may have its uses and requires further research.

Sealing Capacity of Bulk-fill Resin in Endodontically Treated Teeth

“…This method has been contested because it is an evaluation of a subjective nature, in which the degree of dye penetration is calculated by means of scores. 19 Therefore, to minimize the inter-examiner subjectivity, in this study, the evaluators underwent a process of calibration and the Kappa index was calculated (K> 82%).…”

Evaluation of microleakage of giomer and silorane based resins - in vitro study

“…Authors who have found no statistically significant differences in microlekage scores of siloranes and methacrylate composites are Ernst et al and Umer et al (14,15). Both used hybrid composites.…”

The effect of a new-generation flowable composite resin on microleakage in Class V composite restorations as an intermediate layer

“…Dye penetration along the occlusal and cervical margins of the tooth-restoration interface was evaluated by two independent observers and recorded as follows: 0 = no dye penetration, 1 = penetration involving half the occlusal/gingival wall, 2 = penetration involving more than half the occlusal/gingival wall, and 3 = penetration involving the axial wall. [11]…”