Interfacial bond strength of amalgam repaired with amalgam and light cure composite resin - an in vitro study Singh Baljit1, Professor and Head, Kaur Padda Bhupinder, Director, Post Graduate Studies 1Address for Correspondence: Dr. Baljit Singh Tooth Care Multlspeclality Dental Clinic and Implant Centre Chandigarh Chowk, Nawanshahr, Punjab
Online published on 7 December, 2011. Abstract Objective The objective of this in vitro study was to evaluate interfacial bond strength of amalgam repaired with amalgam and light cure composite resin. Method and Materials 150 extracted molars were collected and equally divided into three groups. In two experimental groups (Group A and B) standardized wide mesio-occluso-distal cavities were made and restored with high copper silver amalgam and then stored for 21 days in saline solution. After 21 days, mesiobuccal cusps of restored molars were reduced using a straight fissure bur. In group A the reduced cusps were repaired with high copper silver amalgam and in group B the reduced cusps were repaired with light cure composite resin using clearfil liner bond 2 V adhesive and repaired teeth were stored in saline solution for 21 days. In control group (Group C) standardized wide mesio-occluso-distal cavities were made and mesiobuccal cusps were reduced using a straight fissure bur. Teeth were then restored with high copper silver amalgam and stored in saline solution for 21 days. After 21 days, stored teeth in all 3 groups were assessed for fracture resistance by applying force under Universal Instron Testing Machine (Llyods, England). Results The mean force required to fracture teeth in group C (30.30 KgF) was higher than that in each of the experimental groups. Among the experimental groups the mean force required to fracture teeth in group B (17.62 KgF) was higher than that in group A (14.62 KgF). Conclusions The results suggested that the intact amalgam showed a significantly higher strength than repaired groups and the strongest repaired specimens were made when the amalgam surfaces were repaired with light cure composite resin using clearfil liner bond 2 V adhesive. Top Keywords Interfacial Bond Strength Composite Resin. Top |