Author : Patricia Cristina Robbs
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)
Book Synopsis Determining the Force Required to Disassemble a Morse Taper Implant-abutment Connection Complex by : Patricia Cristina Robbs
Download or read book Determining the Force Required to Disassemble a Morse Taper Implant-abutment Connection Complex written by Patricia Cristina Robbs and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Morse connections favor mechanical stability of implant abutments due to the angulation of the wall studs. Several studies have examined the importance of mechanical stability for the maintenance of prosthetic restorations, in terms of both health of the peri-implant tissues and longevity of the prostheses. However, this mechanical union hinders the decoupling of the abutment-implant system and causes structural deformations during removal for the maintenance of the system, potentially harming the prostheses. This study aims to determine the traction force required to remove prosthetic components coupled to implants with Morse-type connections. Twenty osseointegrated implants with 3.5-mm diameters, 13-mm lengths, and Morse-type connections, and 20 indexed abutments were used in this study. The inner wall angulation for 10 implants was 24u00ba (Group 1) and that for the other 10 was 16u00ba (Group 2). Analysis of abutment roughness was performed before and at the end of the mechanical tests. The abutments of both types were connected to the corresponding implants using a torque of 20 N.cm. Load cycling tests employing a torque of 200 N.cm were carried out in 200,000 cycles to simulate chewing. A traction force was applied with a ratio (R) of 0.1 between the minimum and maximum loads to determine the force required to remove the abutment. During the analysis of the abutment in a profilometer, some imperfections due to the manufacturing process of the components were identified. These were more evident in parts with 24u00ba-angulation. Cycling tests did not establish the need for greater strength to decouple the implant abutments with wall angulations of 16u00ba and 24u00ba. Greater deformations were identified in the 16u00ba-angulation implants after final analysis in the profilometer. This study concludes that Morse-type connections with wall angulations of 24u00ba and 16u00ba favor the decoupling of the abutment-implant system with no distortions.