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Volume 35 , Issue 1
January/February 2015
Pages 41-47

Evaluating Residual Dentin Thickness Following Various Mandibular Anterior Tooth Preparations for Zirconia Full-Coverage Single Crowns: An In Vitro Analysis

Bruna Borelli, DDS, PhD/Roberto Sorrentino, DDS, MSc, PhD/Cecilia Goracci, DDS, MSc, PhD/Massimo Amato, MD, DDS/Fernando Zarone, MD/Marco Ferrari, MD, DDS, PhD

PMID: 25734705
DOI: 10.11607/prd.1873

The objective of this study was to evaluate the residual dentin thickness (RDT) after different tooth preparations. Ninety mandibular anterior teeth were divided into three groups: central incisors, lateral incisors, and canines. Specimens were prepared for single-crown coverage with shoulder, slight chamfer, and knife-edge finish lines. Specimens were sectioned and divided into four subgroups according to measurement areas: (1) buccal, (2) distal, (3) lingual, and (4) mesial. The RDT was analyzed statistically by means of one-way analysis of variance and Tukey post hoc test (P = .05). Significant differences were found for shoulder but not for slight chamfer and knife-edge finish lines. The interproximal areas wound up being critical due to thin RDT, potentially interfering with the structural and biologic integrity of teeth.

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