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Fracture resistance of endodontically restored, weakened incisors
Author(s) -
Cauwels Rita G. E. C.,
Lassila Lippo V. J.,
Martens Luc C.,
Vallittu Pekka K.,
Verbeeck Ronald M. H.
Publication year - 2014
Publication title -
dental traumatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 81
eISSN - 1600-9657
pISSN - 1600-4469
DOI - 10.1111/edt.12103
Subject(s) - mineral trioxide aggregate , dentistry , fracture (geology) , universal testing machine , significant difference , orthodontics , medicine , materials science , composite material , ultimate tensile strength
Objectives To test the fracture strength of weakened bovine incisors endodontically treated with mineral trioxide aggregate ( MTA ), calcium phosphate bone cement ( CPBC ) or fibre reinforced composite ( FRC ) posts, and to evaluate the fracture mode. Methods Weakened bovine incisors ( n = 75), standardized according to the dentinal wall thickness at the cervical area, were randomly assigned to one control group and three experimental groups. Unfilled teeth were assigned to group 1 ( n = 20) and served as control group. Group 2 ( n = 17) consisted of teeth filled with MTA . In group 3 ( n = 18), the incisors were filled with CPBC and in group 4 ( n = 20) with FRC posts. All specimens were subjected to load at a cross‐head speed of 60 mm min −1 until fracture occurred. The initial ( IL ) and final fracture ( FL ) loads (N) were recorded, and the failure mode among the different groups was evaluated. Results anova showed a statistically significant difference in fracture load among the groups. Tukey's test revealed a significant difference for the IL between the control group and the experimental groups with exception of the MTA group. The FL was not significantly different among the experimental groups. A high percentage of favourable fractures was seen in the FRC and CPBC groups. Conclusion FRC posts and CPBC could be promising materials to strengthen non‐vital structurally compromised teeth.