title: The effect of tooth preparation height and diameter on the resistance of complete crowns to fatigue loading.
abstract: This study investigated the relationship between tooth preparation height and diameter and the resistance of cemented crowns to dynamic loading. Crown and abutment analogs were cemented using zinc oxide-eugenol, zinc phosphate, glass-ionomer, and resin composite luting agents. Abutment height varied from 1 to 7 mm in increments of 1 mm. Diameters of 3, 4, 5, 6, 7, and 8 mm were tested. A testing apparatus designed to apply dynamic stresses was used. The cemented crowns were loaded until the cement bond failed or the components reached 1 million stress cycles. The staircase technique was applied for data analysis. The results showed that: (1) the relationship between abutment height (or diameter) and resistance to dynamic lateral loading is approximately linear; and (2) crowns luted using resin composite cement were more resistant than those placed using glass-ionomer cement, which in turn were more resistant than crowns cemented with zinc phosphate or zinc oxide-eugenol cements.
authors.affiliation: Division of Fixed Prosthodontics, School of Dentistry, University of Geneva, Switzerland. Wiskott@cmu.unige.ch
authors.forename: H W
authors.initials: HW
authors.lastname: Wiskott
authors.forename: J I
authors.initials: JI
authors.lastname: Nicholls
authors.forename: U C
authors.initials: UC
authors.lastname: Belser
mesh_terms: D002484:Cementation / Q000379:methods*; D003442:Crowns; D000044:Dental Abutments; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D005054:Eugenol; D006801:Humans; D016014:Linear Models; D008277:Magnesium Oxide; D008422:Materials Testing; D011076:Polycarboxylate Cement; D019279:Resin Cements; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*; D015034:Zinc Oxide; D015035:Zinc Oxide-Eugenol Cement; D015036:Zinc Phosphate Cement
chemical_list: D011076:Polycarboxylate Cement; D019279:Resin Cements; D015035:Zinc Oxide-Eugenol Cement; C103502:Variolink; D008277:Magnesium Oxide; D005054:Eugenol; C076899:Temp-Bond; D015036:Zinc Phosphate Cement; C040235:Ketac-cem; C086629:Phosphacap; D015034:Zinc Oxide