The Effect of Two Body Wear on CAD/CAM PEEK against Monolithic Zirconia, Lithium Disilicate, and Tooth Enamel; “An in vitro study”

Document Type : Original Article

Authors

1 Teaching Assistant, Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Egyptian Russian University

2 Professor, Fixed Prosthodontics Department Faculty of oral and dental medicine (Dentistry), Cairo University

3 Professor and Head of Fixed Prosthodontics Department Faculty of Dentistry, Ain Shams University

4 Lecturer of Fixed Prosthodontics Conservative Department Faculty of Oral and Dental Medicine, Misr International University

Abstract

Statement of the Problem: The fracture of the veneering material of any bi-layered fixed restoration is a decisive factor. Recently developed PEEK has gained an attention in being used in the oral cavity as a fixed partial denture framework. However, deciding whether PEEK restoration will withstand function and retain its form is still under investigation. Introduction; PEEk which is basically a result when manufacturer included ceramic filler particles in its matrix BioHPP, making it a suitable polymer to be used as a temporary and permanent restorations. To test whether this new BioHPP will withstand the function in the oral cavity, in terms of wear and volumetric loss, and determine its efficacy as permanent or final restoration. Materials and Methods; 30 BioHPP discs, apposing human enamel and lithium disilicate and zirconia six millimeter hemispheres, were tested in a dual axis chewing simulator . the number of cycles was 120,000 corresponding to six months intra-orally. Then the specimens were scanned pre and post testing, and volume was evaluated using Geomagic qualify software. Results; There was a statistically significant difference between volume loss in the three groups (P-value = 0.003, Effect size = 0.361). Pair-wise comparisons between the groups revealed that enamel showed the statistically significantly highest mean volume loss whereas L. Zirconia showed lower mean value and Lithium Disilicate showed the lowest mean weight loss. Conclusion; BioHPP is a convenient material to use intra orally in a monolithic form, its also expected to cause less wear than most used ceramics.

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Egyptian Dental Journal
Volume 68, Issue 3 - Serial Number 4
July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
July 2022
Pages 2691-2700

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