Comparative Evaluation of Flexural Strength of Class V Cavities Restored with Direct Composite, Sandwich Technique and Reverse Sandwich Technique: An Invitro Study.

Abstract

Background: Resin composites are widely recognized as the preferred choice for direct restorations due to their excellent aesthetics, strong adhesion to tooth structure, and favorable mechanical properties, but it carries the disadvantages of poor retention, polymerization shrinkage, and less tolerance to moisture, which is the condition in case of cervical cavities.

Aim: The aim of this study is to evaluate the flexural strength of class V cavities restored with direct composite, Sandwich technique and Reverse sandwich technique.

Materials and methods: 40 sound maxillary premolars were involved in this study. Standardized class V cavities were prepared measuring 3mm mesiodistal diameter, 2mm Cervico-occlusal diameter and 2mm depth with a round bur. The specimens were then divided into 4 groups of 10 samples each. Group 1 – control, Group 2 – Direct composite restoration, Group 3 – Sandwich restoration and Group 4 –

Reverse sandwich restoration. The teeth were subjected to flexural strength testing under UTM after storage in distilled water for 24 hours.

Results: There was a significant difference (P<0.01) in flexural strength between Reverse sandwich, Sandwich and control groups.

Conclusion: Teeth restored with Reverse sandwich technique showed the highest flexural strength among the experimental groups, followed by Sandwich technique and Direct composite, respectively.