Author : Amani Alsaery
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (99 download)
Book Synopsis Strain and Load-to-fracture Comparison of CAD-CAM Dental Implant Crown Materials Under Loading by : Amani Alsaery
Download or read book Strain and Load-to-fracture Comparison of CAD-CAM Dental Implant Crown Materials Under Loading written by Amani Alsaery and published by . This book was released on 2017 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Purpose: The material and design of implant prostheses influence the loading of dental implants, which may affect the adaptation of bone1. When choosing materials for implant-supported prostheses, the clinician could choose the one that places less stress on the implant and surrounding tissues2. Use of ceramic materials for veneering implant-supported prostheses is common. Computer-aided design and computer-aided manufacturing (CAD-CAM) technique have provided many advantages starting with the speed of design, processing, fabrication and accuracy. New materials have been developed to achieve the optimum quality; these include Zirconia-reinforced Lithium Silicate Ceramic (ZLS) and a Hybrid ceramic containing a resin-reinforced glass network (Enamic). The screw access channel technique is frequently utilized to help clinicians retrieve cement-retained implant crowns when needed. One concern with screw access holes is the fracture resistance of the crown material after creating the access channel in a cement-retained crown. This study was performed in two parts: the aim in Part 1 was to measure and compare the influence of (ZLS) and (Enamic) with different ceramic CAD-CAM implant-supported crown materials for strain distribution generated around the implants during cyclic loading. Part 2 was performed in order to measure and compare the load to fracture values of different cement-retained crown materials with screw access channel. Material and Methods: Four 3.7mm X 10mmD platform Legacy 1 Implants (Implant Direct, Carlsbad, CA, USA) were placed into a 12" x 2" x 8mm resin block. Legacy Zirconia Straight Contoured Stock Abutment (3.5mmD/1mm Collar Height, Implant Direct, Carlsbad, CA, USA) (N=20) were torqued into the implant fixtures to support crowns that were milled from a virtual design using four different all-ceramic materials (N=20). A resin cement was used to cement crowns on zirconia abutments. Initially, the crowns were cyclically loaded two times at loads ranging from 5N to 400N at a thirty-degree angle and strain values were recorded. Three-dimensional digital image correlation (3D-DIC) and a commercial image correlation software (VIC 3D v7.0, Correlated Solutions, Inc. Columbia, SC, USA) were used to measure maximum and minimum principal strains (tensile and compressive) around the implants. Secondly, screw access channels were prepared on crowns to receive a vertical load from 0N until fracture and load-to-failure values of crowns were recorded and were statistically analyzed. Results: Strain measurements showed no statistically significant difference in the crown materials (p>.05). No statistical difference was found in the interaction between the material and the type of the strains in this study. Results for the load-to-failure test series showed a statistically different loads for the materials. ZirCAD showed higher loads with Tukey grouping when compared to the other materials (p