Clinical Evaluation of Wear Behavior of Human Enamel and Chipping of Veneered Zirconia against Monolithic Zirconia (Randomized Controlled Clinical Trial)

Abstract

Objective: To evaluate the wear behavior of human enamel and chipping of veneered and monolithic zirconia for posterior full coverage restorations. Material and methods: Thirty-four zirconia full coverage restorations (seventeen in each group) were fabricated. The patients were divided into two groups according to the type of zirconia used; group 1 (comparator group) veneered zirconia crowns and group 2 (intervention group) monolithic zirconia single crowns. All crowns were lab fabricated and polished. For opposing teeth wear measurements 3D non-contact profilometer was used where epoxy resin replicas were constructed for opposing arch immediately after crowns cementation, three, six and twelve months. Restoration chipping was measured using modified United States Public Health Services (USPHS) criteria. Results: All restorations were reported as alpha with no chipping. There was no statistically significant difference between (Group 1) and (Group 2) for wear test. Conclusion: Both monolithic and veneered restorations revealed satisfactory mechanical properties with no chipping after one year of clinical use. Wear of opposing enamel was clinically acceptable for both materials. Keywords Ceramics; Chipping; Monolithic zirconia; Veneered zirconia; Wear.

Clinical Performance and Wear Resistance of Highly Translucent Nano Zirconia Reinforced Glass Ionomer Filling Versus Conventional Resin Composite Restorations in Patients with Proximal Carious Teeth: Randomized Clinical Trial

“…This outcome could be explained by using a special glass particle ZrO2 as filler fine controlled micronization which creates particle size homogeneity, provide high strength and permits the material to withstand occlusal load. This consequently reduces the occurrence gross fracture [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Wear of dental ceramics

“…The surface wear is analyzed according to the volume change, maximum and average profile losses, according to quantitative monitoring of clinical wear [126,130] (Figure 14). Epoxy resin models from conventional impressions have also been reported as an alternative for wear measurement [131].…”

3D Surface Deviation Wear Analysis of Veneered PEEK Crowns and Its Correlation with Optical Digital Profilometry

“…It can overcome many contact profilometry drawbacks because of its nondirect contact with the involved surface and the satisfactory results of the evaluated dental wear. 14,15 However, the direction of the light is a critical criterion to accurately detect surface irregularities, given that highly angled light orientation affects the preciseness of measurements. Additionally, the object must be at a distance of millimeters or even less from the objective lens to detect the surface micro-irregularities.…”

“…Optical digital profilometry (ODP) is a rapid, nondestructive 3D surface measurement technique resulting in noticeably greater surface topography details. It can overcome many contact profilometry drawbacks because of its nondirect contact with the involved surface and the satisfactory results of the evaluated dental wear 14,15 . However, the direction of the light is a critical criterion to accurately detect surface irregularities, given that highly angled light orientation affects the preciseness of measurements.…”