LOGIN
 
Share Page:
Back

Volume 19 , Issue 4
July/August 2006

Pages 391–396


In Vivo Wear of Enamel by a Lithia Disilicate–Based Core Ceramic Used for Posterior Fixed Partial Dentures: First-Year Results

Josephine F. Esquivel-Upshaw, DMD, MS / Henry Young, DDS / Jack Jones, DMD / Mark Yang, PhD / Kenneth J. Anusavice, PhD, DMD


PMID: 16900824

Purpose: This study aimed (1) to test the hypothesis that no significant relationship exists between the magnitude of occlusal clenching force and wear rates of enamel opposing a new core ceramic (e.max Press, Ivoclar Vivadent) used in posterior fixed partial dentures (FPDs); and (2) to test the hypothesis that mean annual enamel wear by an experimental core ceramic is comparable to the mean annual enamel wear by enamel of 38 µm. Materials and Methods: Baseline data were obtained for patients in addition to preliminary impressions of maxillary and mandibular teeth. Thirty ceramic FPDs were processed from a new core ceramic (e.max Press) that was hot pressed and glazed. Patients were recalled 1 year after cementation and evaluated using clinical criteria that included wear assessment of opposing teeth. Impressions were made of the opposing teeth with polyvinylsiloxane impression material and photographs were taken of intraoral occlusal contacts marked with articulating ribbon. Baseline casts and casts made at each recall exam of opposing dentitions were scanned using a 3-dimensional laser scanner (Laserscan 3D, Willytec) and evaluated for wear. A total of 21 occlusal surfaces were analyzed for the presence of wear. Results: Statistical analysis using a linear and quadratic model revealed no significant relationship between occlusal forces and wear rate assuming either a linear model (R2 = 0.018) or a quadratic model (R2 = 0.023). The maximum annual wear of enamel by the glazed core ceramic (e.max Press) was 88.3 µm, which is significantly greater than the annual enamel-by-enamel wear of 38 µm (P < .0001). Conclusion: Further analysis with a larger sample size is needed to determine the relationship between occlusal clenching force and wear rate and the influence of other factors that cause increased wear of enamel by opposing ceramic restorations. Int J Prosthodont 2006;19:391–396.


Full Text PDF File | Order Article

 

 
Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.

 

© 2017 Quintessence Publishing Co, Inc

IJP Home
Current Issue
Ahead of Print
Archive
Author Guidelines
About
Accepted Manuscripts
Submission Form
Submit
Reprints
Permission
Advertising
Quintessence Home
Terms of Use
Privacy Policy
About Us
Contact Us
Help