title: Ensuring retention for crowns and fixed prostheses.
abstract: Crowns and fixed prostheses are well-proven, accepted and routinely used restorations. However, they occasionally come loose from tooth preparations. Many things can cause these failures. In this article, I have discussed the following reasons for lack of adequate retention of crowns and fixed prostheses: inadequate tooth preparation; too much trust in dentin bonding agents and lack of adequate tooth buildup; tooth preparations that lack irregularities; improper selection of cements; and lack of postoperative occlusal adjustment.
authors.affiliation: Clinical Research Associates, Provo, Utah 84604, USA.
authors.forename: Gordon J
authors.initials: GJ
authors.lastname: Christensen
mesh_terms: D003442:Crowns; D001840:Dental Bonding / Q000379:methods; D003738:Dental Cements / Q000737:chemistry; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003781:Denture Retention; D003830:Denture, Partial, Fixed; D006801:Humans; D019558:Occlusal Adjustment; D013499:Surface Properties; D019231:Tooth Preparation, Prosthodontic / Q000379:methods
chemical_list: D003738:Dental Cements