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Fracture Resistance of Immature Teeth Submitted to Different Endodontic Procedures and Restorative Protocols
Isabel Mello1, Pierre-Luc Michaud1, Zahndra Butt1
1Department of Dental Clinical Sciences, Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada.
Introduction:
The purpose of this in vitro study was to determine whether the methods used to treat endodontically and restore anterior immature teeth with a necrotic pulp influence their resistance to fracture.
Methods:
After access opening and cleaning and shaping, 80 specimen teeth were assigned into 5 groups according to the endodontic obturation method and coronal restoration as follows: A1, apexification with a composite restoration in the crown area; A2, apexification with a composite restoration in the crown and 3 mm into the root; IR, immediate revascularization with a composite restoration in the crown area; SR, successful revascularization with a composite in the crown area; and the control group, a mature tooth treated with gutta-percha and sealer with a composite restoration in the crown area. The teeth were mounted in acrylic blocks and brought to fracture under compressive forces in a universal testing machine. Both the fracture strength and the location where the fracture occurred were recorded.
Results:
There were no statistically significant differences in the fracture resistance among the 5 groups (1-way analysis of variance, F4 = .545, P = .703). No statistically significant differences were found in the location where the fracture occurred either (χ24 = 4.1, P = .391).
Conclusions:
Within the limitations of this in vitro study, it can be concluded that the treatment options used to treat nonvital immature teeth provided the same resistance to fracture.
