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Effect of Casein Phosphopeptide-Amorphous Calcium Phosphate on Fracture Resistance of Reattached Tooth Fragments Using Conventional and Self-Adhesive Bioactive Flowable Composite. | LitMetric
Objectives : The present study aimed to investigate the effect of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) complex and the type of flowable composite (conventional or self-adhesive bioactive) on the fracture resistance of fractured incisors restored through reattachment technique.Materials And Methods : In this experimental study, 60 extracted bovine central mandibular incisors were randomly divided into six groups ( = 10) according to the reattachment technique. Their incisal edges were cut off to represent an enamel-dentin fracture. The fragment edges were reattached as follows: Group 1-selective etching and bonding followed by conventional flowable composite; Group 2-selective etching and bonding followed by bioactive flowable composite; Group 3 was like Group 2 but without applying bonding; Groups 4, 5, and 6 were similar to Groups 1, 2, and 3, respectively, but both tooth fragments were pretreated with CPP-ACP-containing paste for 3 minutes. Fracture resistance was assessed by a universal testing machine.Statistical Analysis : Data were analyzed by SPSS-Statistical Package for the Social Sciences-software using one-way analysis of variance and Tukey post-hoc tests (α= 0.05).Results : The highest and lowest fracture resistance was recorded in Groups 5 (15.96 MPa) and Group 6 (1.95 MPa), respectively, being significantly different from the other groups. The mean fracture resistance of Groups 3 and 6 was significantly lower than the other groups ( < 0.05). However, Groups 1, 2, and 4 showed no difference in fracture resistance.Conclusion : Bioactive composite was not superior to conventional composite for fragment reattachment, but using it in self-adhesive mode reduced the fracture strength significantly. Yet, pretreatment with CPP-ACP, followed by application of adhesive, improved the fracture resistance of bioactive composite.
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