Maia Belizane das Graças Oliveira, Santos Thais da Silva Alves, Carvalho Cláudio Antonio Talge, Verner Francielle Silvestre, Junqueira Rafael Binato
Health Applied Sciences Master Program, Federal University of Juiz de Fora.
Department of Restorative Dentistry, Endodontic Division, São Paulo State University (Unesp), Institute of Science and Technology.
Dent Mater J. 2023 Jan 31;42(1):92-98. doi: 10.4012/dmj.2022-114. Epub 2022 Nov 8.
This in vitro study compared the fracture resistance of weakened roots restored with milled or relined glass fiber post (GFP). Seventy bovine incisors were divided into seven groups, according to the weakening protocol (none: control; medium-weakened: MW; highly-weakened: HW) and post anatomization technique (non-relined, relined with Bulk Fill or Z350 resin; milled GFP: M). Roots were thermomechanical cycled and submitted to compression. Frequencies and groups were compared by the chi-square test and two-factor ANOVA, Tukey's, and t-test (α=5%). The HW-M obtained the lowest values, showing significant differences compared to all groups (p<0.001). The highest value was HW-Bulk fill, with significant difference compared to MW-M (p=0.037) and HW-M (p<0.001). The frequency of repairable fractures was 100% in the control, 87%, and 63% in the MW and HW, respectively. Relined or milled GFPs can be considered to rehabilitate weakened teeth since failure patterns were predominantly repairable in all groups.
