Tensile strength analysis of three different restoring techniques in canine primary teeth

Extensive caries in the primary anterior teeth is one of the highly prevalent dental issues in primary dentition. On the other hand، special considerations for restoring these teeth are a challenge for the dental practitioner. The aim of this in vitro study was to compare the tensile bond strength of a new method of Reverse Metal Post Technique (RMPT) with two conventional methods. Eighty-four extracted primary canines were assigned to three equal groups. The crowns were cut-off 1 mm coronal to CEJ and the root canals were prepared for the next stage. The teeth were restored according to the groups they were assigned to; Group 1 with composite posts; Group 2 with alpha-shaped orthodontic wires; and Group 3 with the RMPT. The specimens were then subjected to tensile force by a mechanical testing machine. Data were analyzed using ANOVA، tukey post hoc، Chi-square and student t test (α =0. 05). The mean tensile bond strength for groups 1، 2 and 3 were 6. 26 ± 2. 40، 7. 35 ± 1. 60 and 9. 88 ± 2. 60MPa، respectively. A significant difference was observed between group 3 and the two other groups (p<0. 001). However، the difference between groups 1 and 2 was not statistically significant (p>0. 05). The tensile bond strength was significantly higher in RMPT than the two conventional methods used for restoring severely destroyed primary anterior teeth.