Evaluation of fracture resistance of upper canines endodontically treated and restored with fiberglass pins – in vitro study

Vol. 13 – Number 50 – 2022 NOTEBOOK OF CLINICAL DENTISTRY Original article Page 106-111 Evaluation of fracture resistance of upper canines endodontically treated and restored with fiberglass pins – in vitro study Raphaela Cassia de Lima¹ Guilherme Berger¹ Ederson Aureo Gonçalves Betiol¹ Zenildo Norberto Stall² Abstract The success of the restoration of the tooth treated endodontically and restored with an intraradicular pin depends on an adequate structural reconstruction, with the amount of coronary and root remnants relevant factors in its resistance. The objective of this work was to evaluate the root resistance to fracture of upper canines humans with three heights of coronary remnants (0, 2, and 4 mm in height). Forty upper canines were used, divided into 4 groups: A) sectioned at the level of the cementum junction; B) with 2 mm of coronary remnant; C) with 4 mm of coronary remnant and; and D) with 4 mm of coronary remnant, but without the use of the pin. The teeth were treated endodontically and Groups A, B, and C restored with fiberglass pins, White post DC, cemented with Multilink N. All specimens were restored with composite resin, the specimens were subjected to compression tests and the results were expressed in the amount of Kgf necessary to provide or not the fracture of the pin-root set. The means required for catastrophic failure were: Group A – 55.30 kg/f (sd=14.6); Group B – 53.97 kg/f (sd=11.18); Group C – 37.58 kg/f (sd=16.68); and Group D – 51.59 kg/f (sd=18.82). It was concluded that there were no significant differences between the groups, but it was observed that the maximum force required for the fracture of the pin-root joint was, on average, lower in Group C, and Group D showed greater resistance. Descriptors: Dental pins, ferrule, post and core technique. ¹ Department of Restorative Dentistry – UFPR. ¹ Restorative Dentistry – Herrero School. DOI: 10.24077/2022;13502286110