title: In vitro analysis of residual tooth structure of maxillary anterior teeth after different prosthetic finish line preparations for full-coverage single crowns.
abstract: To evaluate residual dentin thickness (RDT) after different tooth preparations, 90 sound maxillary anterior teeth were selected and divided into 3 groups according to tooth type (n = 30), namely, maxillary central incisors, maxillary lateral incisors, and maxillary canines. In each group, specimens were randomly divided and prepared for single-crown coverage with shoulder (SHO, n = 10, control), slight chamfer (CHA, n = 10), and knife-edge (KNE, n = 10) finish lines. After tooth preparation, specimens were sectioned and divided into 4 subgroups (buccal, distal, palatal, and mesial) according to measurement area. RDT values were compared by using one-way ANOVA and Tukey's post hoc test (P = 0.05). Significant differences were found between SHO and the other two groups (P < 0.05) but not between CHA and KNE (P > 0.05). SHO was significantly more aggressive than CHA and KNE, which were comparable. Interproximal areas became critical due to thin RDT, which could potentially compromise the structural and biological integrity of teeth. The choice of finish line should be guided by careful clinical evaluation.
authors.affiliation: Department of Fixed Prosthodontics and Dental Materials, Tuscany School of Dental Medicine, University of Florence and Siena, Siena, Italy. unabellabruna@gmail.com
authors.forename: Bruna
authors.initials: B
authors.lastname: Borelli
authors.forename: Roberto
authors.initials: R
authors.lastname: Sorrentino
authors.forename: Cecilia
authors.initials: C
authors.lastname: Goracci
authors.forename: Fernando
authors.initials: F
authors.lastname: Zarone
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D003442:Crowns; D003481:Cuspid / Q000473:pathology*; D003804:Dentin / Q000473:pathology; D006801:Humans; D007180:Incisor / Q000473:pathology*; D009811:Odontometry / Q000379:methods; D019228:Tooth Crown / Q000473:pathology; D019231:Tooth Preparation, Prosthodontic / Q000145:classification* / Q000295:instrumentation / Q000379:methods