title: Effect of screw hole filling on retention of implant crowns.
abstract: The screw access channels of 15 degrees angled Esthetic Abutments (Brånemark System) were either (a) completely filled with a vinyl polysiloxane impression material (Memosil), (b) partially filled with Memosil or (c) had lower portion filled with Memosil and the remainder with composite resin. The force required to remove a temporarily cemented restoration was measured. The removal force was significantly reduced with the channel completely filled with Memosil compared to those partially filled with Memosil (p<0.01) or with composite resin placed over Memosil (p<0.01). The method selected to fill the screw access channel of an implant abutment can be a significant factor affecting retention of a cemented restoration.
authors.affiliation: University College London, Eastman Dental Institute, London, UK.
authors.forename: Kit Ming
authors.initials: KM
authors.lastname: Chu
authors.forename: Christopher Jeremy
authors.initials: CJ
authors.lastname: Tredwin
authors.forename: Derrick J
authors.initials: DJ
authors.lastname: Setchell
authors.forename: Edward
authors.initials: E
authors.lastname: Hems
mesh_terms: D000044:Dental Abutments; D003738:Dental Cements / Q000737:chemistry; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design / Q000379:methods*; D017268:Dental Prosthesis Retention / Q000379:methods*; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods*; D012826:Silicone Elastomers / Q000737:chemistry
chemical_list: D003738:Dental Cements; C115979:Memosil CD; D012826:Silicone Elastomers