Comparative evaluation of bond strength on reattachment of fractured tooth fragments with different rehydration techniques-an Invitro study

Abstract

AIM AND BACKGROUND:Traumatic injuries involving fracture of anterior tooth is one of the common problems among children and adolescents. Tooth  fragment reattachment technique represents an important step in the science and art of restoring fractured anterior  teeth.One of  the  factors  that  play  an  important  role  in  the  success  of fragment reattachment is the type of rehydration media. In the present study, effectiveness of various rehydration media; milk,coconut water and CPP-ACP on bond strength of reattached tooth fragments is compared with dry storage at 1 and 24 hour time intervals.Aim of the present study is to assess the effect of rehydration with coconut water,milk and CPP-ACP on the bond strength of the reattached tooth fragments at 1 and 24 hour time intervals.

METHODOLOGY: In this experimental study 72  extracted human  permanent  central incisors were selected and samples were divided into four groups of 18 teeth each. These groups were further divided into eight groups of nine teeth each based on the duration  of  placing  in  rehydration  media  and  samples  were  sectioned  stored  in rehydration media coconut water, milk, CPP-ACP and dry storage as control group. After 1 and 24 hours the fragments were reattached using a flowable composite resin. The bond strength was measured using Universal Testing Machine.

RESULTS: Milk showed statistically significant increase in bond strength value of 273.30 ± 64.33 N at 1 hr storage and 285.76 ± 83.95 N at 24 hr storage which is followed by CPP-ACP, coconut water and dry storage respectively. In intra group comparison among 1 and 24 hr storage all groups have improved bond strength at 24 hr storage except for dry storage but this difference was not statistically significant.

CONCLUSION: Milk can be considered as the best rehydration media for fragment reattachment.