Multiple implants impression accuracy of edentulous jaw : digital and conventional implant impression comparative study
department or school: Dentistry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: AlTuwaijri, Sahr
issued: 2018-08-20T15:38:15Z
issued: 2018
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Statement of problem: The use of digital impressions for implants are limited to single and short span bridges due to the few available studies supporting their usage in more complex cases. Therefore, its essential to evaluate their accuracy in full arch cases to benefit from their great advantages. Purpose: Evaluate and compare the accuracy of digital and conventional impressions for multiple straight and angulated implants of full arch implant supported fixed prosthesis. Also, assess the effect of implant angulation of 45° and increased length on the accuracy of both methods. Materials and methods: A stereolithographic (SLA) model of edentulous mandibular cast was fabricated and used to produce the master stone cast with four Nobel CC RC implants placed at tooth positions 3.4, 3.2, 4.2 and 4.4. Implants at #32 and 42 were perpendicular to the occlusal plane and parallel to each other while implants at #34 and 44 were distally angulated with 45°. Three impression methods were made from the master stone cast. Digital impressions were made with Trios (3Shape, Copenhagen, Denmark) intraoral scanner (IOS) (n=10). Conventional splinted open-tray implantâlevel impressions were made with Polyvinyl (PVS) (n=10) and Polyether (PE) (n=10). All stone casts were digitized using a 3shape D800 lab scanner to obtain STL (standard tessellation language) files, which then were imported into Rhino5 3D software. Six linear measurements were obtained for each cast to evaluate their discrepancies from the master cast. Absolute values of the linear deviation of each line among the three groups were compared using Kruskal-Wallis test and Dunn's post hoc test. Results: Significant difference (P< 0.05) were found between Trios and PVS and between PE and PVS for the distance between Implant #42 and 44. Also, for the distance between implant #32 and 44 between PE and Trios, and between PE and PVS. No significant difference was found for the other lines. Conclusion: The PE impression techni…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/66829
note: Multiple implants impression accuracy of edentulous jaw: digital and conventional implant impression comparative study by Sahr AlTuwaijri A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Craniofacial Science) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) August 2018 © Sahr AlTuwaijri, 2018 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, a thesis/dissertation entitled: Multiple implants impression accuracy of edentulous jaw: digital and conventional implant impression comparative study Submitted by Sahr AlTuwaijri in partial fulfillment of the requirements for the degree of Master of Science in âCraniofacial Scienceâ Examining Committee: Dr. Caroline Nguyen Supervisor Dr. Chris Wyatt Supervisory Committee Member Dr. Dorin Ruse Supervisory Committee Member Dr. Huge Kim Additional Examiner Additional Supervisory Committee Members: Dr. Vincent Lee Supervisory Committee Member iii Abstract Statement of problem: The use of digital impressions for implants are limited to single and short span bridges due to the few available studies supporting their usage in more complex cases. Therefore, its essential to evaluate their accuracy in full arch cases to benefit from their great advantages. Purpose: Evaluate and compare the accuracy of digital and conventional impressions for multiple straight and angulated implants of full arch implant supported fixed prosthesis. Also, assess the effect of implant angulation of 45ï° and increased length on the accuracy of both methods. Materials and methods: A stereolithographic (SLA) model of edentulous mandibular cast was fabricated and used to produce the master stone cast with four Nobel CC RC implants placed at tooth positions 3.4, 3.2, 4.2 and 4.4. Implants at #32 and 42 were perpendicular to the occlusal plane and parallel to each other while …
has type: Thesis/Dissertation
date issued: 2018-09
is shown at: 10.14288/1.0371131
language: eng
degree discipline: Craniofacial Science
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/66829