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Accuracy and Efficiency of 3-dimensional Dynamic Navigation System for Removal of Fiber Post from Root Canal–Treated Teeth

2021; Elsevier BV; Volume: 47; Issue: 9 Linguagem: Inglês

10.1016/j.joen.2021.07.002

1878-3554

Anmar Janabi, Patricia A. Tordik, Ina L. Griffin, Behzad Mostoufi, Jeffey B. Price, Priya S Chand, Frederico C. Martinho,

Dental materials and restorations

Abstract Introduction The purpose of this study was to investigate the accuracy and efficiency of the 3-dimensional dynamic navigation system (DNS) compared with the freehand technique (FH) when removing fiber posts from root canal–treated teeth. Methods Twenty-six maxillary teeth were included. Teeth were root canal treated and restored with Parapost Taper Lux (Coltene/Whaledent, Altstätten, Switzerland) luted with RelyX Unicem (3M ESPE, St Paul, MN). A core buildup was then performed using Paracore (Coltene/Whaledent). Teeth were mounted in tissue-denuded cadaver maxillae. Teeth were divided into 2 groups: the DNS group ( n = 13) and the FH group ( n = 13). Cone-beam computed tomographic scans were taken pre- and postoperatively. The drilling path and depth were planned virtually using X-guide software (X-Nav Technologies, Lansdale, PA) in both groups. For the DNS group, drilling was guided with X-Nav software and the FH group under a dental operating microscope. Global coronal and apical deviations, angular deflection, operation time, and the number of mishaps were compared between the groups to determine the accuracy and efficiency. The 3-dimensional volume (mm 3 ) of all teeth was calculated before and after post removal using the Mimics Innovation Suite (Materialise NV, Leuven, Belgium). The Shapiro-Wilk, 1-way analysis of variance, and Fisher exact tests were used ( P < .05). Results The DNS group showed significantly less global coronal and apical deviations and angular deflection than the FH group ( P < .05). DNS required less operation time than FH. Moreover, the DNS technique had significantly less volumetric loss of tooth structure than the FH technique ( P < .05). Conclusions The DNS was more accurate and efficient in removing fiber posts from root canal–treated teeth than the FH technique.