Resistance to Fracture of Upper Premolars with Endodontic Treatment by Conservative and Traditional Access
Keywords:
endodontics, premolar tooth, dental restoration, pulpar cavity.Abstract
Introduction: Tooth pieces, after endodontic treatment, increase their susceptibility to fracture, a phenomenon mainly associated with loss of tooth structure.
Objective: To evaluate, in vitro, the resistance to fracture of upper premolars with endodontic treatment by traditional, conservative and conservative ninja access, with temporary and final restoration.
Methods: A prospective study of longitudinal experimental design was carried out with 42 donated upper premolars, separated into three groups, according to the type of endodontic access to be applied; in turn, each was then divided into two subgroups, according to the type of restoration, and a control group, not performed endodontic treatment. After treatment and restoration, fracture resistance was evaluated using oblique compressive loading (45°) in a universal loading machine. The loads required for fracture were recorded in newtons and statistically compared.
Results: The parts treated by conservative ninja access with provisional and final restoration required an average fracture load of 513.45 N and 638.13 N, respectively; this forces were significantly higher than the resistance values offered by the other treatments, with p < 0.05. Likewise, there were no significant differences in the resistance values obtained between the cases of conservative access and traditional access, nor when comparing the types of applied restoration, with P<0.05.
Conclusions: In in vitro endodontics, the design of the access to the cavity of conservative ninja type significantly affected the resistance to fracture of the upper premolars, acquiring a biomechanical behavior similar to that of the control pieces.
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