title: Effect of preparation depth differences on the marginal fit of zirconia crown copings: an in vitro study.
abstract: If optical scanning is used for crown fabrication, variability in preparation depth may be a limitation. Therefore, this preliminary laboratory study evaluated marginal fit in relation to preparation depth. Three dies with different preparation depths between the vestibular and oral regions were fabricated. Ten zirconia copings were manufactured for each die, and marginal gaps were examined. Increasing differences in preparation depth influenced the size of the marginal gap between the vestibulo-oral and mesiodistal regions significantly (P < .001). This study shows primarily that differences in preparation depth resulted in decreasing marginal precision.
authors.affiliation: University of Medical Centre of the Johannes Gutenberg University, Mainz, Germany. mehdi.sattariazar@unimedizin-mainz.de
authors.forename: Mehdi Sattari
authors.initials: MS
authors.lastname: Azar
authors.forename: Karl Martin
authors.initials: KM
authors.lastname: Lehmann
authors.forename: Helmut
authors.initials: H
authors.lastname: Dietrich
authors.forename: Gernot
authors.initials: G
authors.lastname: Weibrich
authors.forename: Irene
authors.initials: I
authors.lastname: Schmidtmann
authors.forename: Herbert
authors.initials: H
authors.lastname: Scheller
mesh_terms: D003442:Crowns; D000044:Dental Abutments; D018772:Dental Marginal Adaptation; D017267:Dental Prosthesis Design / Q000379:methods; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*; D014093:Tooth, Artificial; D015040:Zirconium
chemical_list: D015040:Zirconium; C028541:zirconium oxide