Effects of abutment and screw access channel modification on dislodgement of cement-retained implant-supported restorations.
This study investigated the influence of implant abutment and screw access channel modification on the retention of copings. Titanium abutment access openings were either left open or modified by placing two vent holes 3 mm from the occlusal edge and 180 degrees apart. Access openings sealed with a resin material were used as controls. Metal copings were cemented and subjected to tensile testing until failure. Access openings with two vent holes resulted in significantly higher mean retention values compared to the opened or sealed screw access groups (P < .05). Cement flow was affected by the internal vent, which increased the area of cementabutment contact.
Department of Restorative Dentistry, University of Washington, Seattle, WA, USA.
Chandur
C
Wadhwani
Timothy
T
Hess
Alfonso
A
Pineyro
Kwok-Hung
KH
Chung
D002484:Cementation / Q000379:methods*; D000044:Dental Abutments / Q000145:classification; D003722:Dental Alloys / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry; D059605:Dental Implant-Abutment Design; D003764:Dental Materials / Q000737:chemistry; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D006801:Humans; D008422:Materials Testing; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry
D003722:Dental Alloys; D003738:Dental Cements; D003764:Dental Materials; C474196:Tempbond NE; D014867:Water; D014025:Titanium; D015034:Zinc Oxide