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Revista Cubana de Estomatología

On-line version ISSN 1561-297X


HERNANDEZ ESPINO, Raúl Jonathan  and  CABRERA IBERICO, Miguel Ángel. Resistance to Fracture of Upper Premolars with Endodontic Treatment by Conservative and Traditional Access. Rev Cubana Estomatol [online]. 2023, vol.60, n.2  Epub June 01, 2023. ISSN 1561-297X.


Tooth pieces, after endodontic treatment, increase their susceptibility to fracture, a phenomenon mainly associated with loss of tooth structure.


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.


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.


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.


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.

Keywords : endodontics; premolar tooth; dental restoration; pulpar cavity.

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