Brushing Wars: Testing The Durability ofIndirect Composite andZirconium -An In Vitro Study

Aim: The aim of this study is to compare the wear resistance, strength, and impact on opposing dentition between multi-unit zirconia fixed dental prostheses (FDPs) layered with feldspathic porcelain and multi-unit polyetheretherketone (PEEK) FDPs layered with indirect composite. Introduction: Metal-ceramic fixed dental prostheses (FDPs) are durable and effective but often lack aesthetic appeal due to their metallic color. All-ceramic FDPs, while aesthetically superior, are prone to chipping and cause significant wear on opposing teeth. Polyetheretherketone (PEEK) offers a promising alternative, combining biocompatibility, mechanical strength, and minimal abrasion to opposing dentition. Materials and Methods: This study compared the wear resistance and strength of multi-unit zirconia FDPs layered with feldspathic porcelain against multi-unit PEEK FDPs layered with indirect composite. The samples underwent preparation, thermocycling, and wear testing using a chewing simulator, with results analyzed using profilometry and statistical software. Results: Zirconia FDPs showed higher wear resistance than PEEK FDPs but caused significantly more abrasion to opposing teeth. PEEK FDPs exhibited less antagonist wear, suggesting a safer option for opposing dentition. Conclusion: PEEK FDPs, while showing lower wear resistance, offer significant advantages in reducing abrasion to opposing teeth, making them a viable alternative to zirconia FDPs for long-term use in clinical settings. Further advancements in PEEK could enhance its suitability as a restorative material.