181013_01 JDAS_Research_Journal_Vol-II Issue 1

Re-attachement of tooth fragment is today the first choice for restoring fractured teeth, whether or not the technique is combined with resin composites. This offers several advantages over conventional acid-etch composite restorations. Improved esthetics is obtained since the original shape, color, brightness and surface texture of enamel are Abstract The reattachment of dental fragments, as a conservative treatment, should be the first choice to restore fractured teeth .The aim of this study was to evaluate the effect of different reattachment techniques on impact strength of human incisors. Method material: Experimental specimens were sectioned at the mesial-incisal proximal edge 3 mm from the incisal edge in a labio-lingual direction at 25degree inclination apically using a diamond disk. Then the teeth were restored with one-step adhesive and dual cure resin luting cement and restored with composite . The extracted central incisor teeth in the three groups were sectioned and re-attached using three different techniques. Sound teeth composed the control group .Simple re-attachment, Over contouring & Internal dentinal groove formation The specimens were mounted on a custom made fixture for determination of shear bond strength using universal testing machine. The shearing force was noted and shear bond strength was calculated and recorded in kilogram force units KgF. Data was submitted t Kruskal Wallis ANOVA was used to test the difference in fracture strength between the four groups. The test showed a p value of < 0.000 thus there is a statistically significant difference in the fracture strength between the four groups. Mann whitney u test was used to check for statistically significant differences between 2 groups. The results of our study showed that ,Group III (Overcontouring) had the highest strength recovery followed by group IV( Internal dentinal groove) and the least being Group II( Simple re-attachment). Conclusion Over-contouring technique had the highest strength recovery almost similar to the sound intact teeth. Simple re-attachment without additional preparation has least strength recovery