Experimental evaluation of two methodologies for the restoration of crown fracture in permanent anterior teeth.

ABSTRACT

AIM: The purpose of this study is to compare, by means of mechanical tests, the resistance of two types of dental restoration in the uncomplicated crown fracture of human permanent maxillary central incisor rebonding of the fractured tooth fragment and application of ceramic veneers. MATERIALS AND METHODS: Thirty human maxillary central incisors were divided into three groups of ten teeth each. The teeth of the first group (Group A) were kept intact and used as controls, while the remaining teeth were sectioned, in order to simulate a crown fracture, and restored respectively with either the rebonding of the fragment (Group B) or with the use of ceramic veneers (Group C). All samples underwent mechanical tests by means of a universal test machine. RESULTS: The mean resistance to fracture recorded is respectively 425.2N for Group A, 233.3N for Group B, and 347.3N for Group C. One-way ANOVA analysis demonstrates statistical significance for at least one couple of values (Group B compared to Group A). The group of restorations with rebonding of fractured fragments has a mean value of resistance to fracture that is lower than both intact teeth and teeth restored with ceramic veneers. The resistance of teeth with rebonded restorations is 54.9% of that of, intact teeth, and resistance increases for teeth restored with ceramic veneers (81.8% of that of intact teeth). CONCLUSION: Ceramic veneers showed a higher resistance than rebonding and resulted to be more reliable in case of further trauma.