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Veneer

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Updated: Mar 21, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

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Published on: December 20, 2024

Veneered Zirconia-Based Restorations Fracture Resistance Analysis.

Ahed Al-Wahadni¹, Ahmad Shahin², Kenneth S Kurtz³

¹Professor of Fixed Prosthodontics, Aesthetic Dentistry and Dental Implants, Faculty of Dentistry-Jordan University of Science and Technology, Irbid, Jordan.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists

|May 11, 2016

Summary

This summary is machine-generated.

Layering veneering (LV) showed superior fracture resistance in zirconia crowns compared to overpressing veneering (OV) and digital veneering (DV). DV exhibited the lowest fracture resistance, indicating technique significantly impacts crown durability.

Keywords:

Zirconia crowns digital layering fracture pressing resistance strength veneering

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Area of Science:

Dental Materials Science
Biomaterials Engineering
Prosthodontics

Background:

Zirconia-based crowns are widely used in restorative dentistry due to their mechanical properties.
Veneering techniques significantly influence the clinical performance and longevity of ceramic restorations.
Understanding the fracture resistance of different veneering methods is crucial for material selection and clinical success.

Purpose of the Study:

To evaluate and compare the fracture resistance of zirconia-based crowns fabricated using three distinct veneering techniques: layering veneering (LV), overpressing veneering (OV), and digital veneering (DV).

Main Methods:

Forty-five zirconia copings were fabricated and divided into three groups (n=15) based on veneering technique: LV (Vita VM9), OV (Vita PM9), and DV (Vita Triluxe forte).
Crowns were cemented on cobalt chromium dies, subjected to thermocycling (3000 cycles, 5-55°C), and then loaded statically until fracture.
Failure loads and modes (cohesive vs. adhesive) were analyzed using one-way ANOVA and Bonferroni tests.

Main Results:

The mean failure loads were significantly different across groups: LV (1200 ± 306 N), OV (857 ± 188 N), and DV (638 ± 194 N) (p < 0.05).
The layering veneering group exhibited the highest fracture resistance.
The digital veneering group showed the lowest fracture resistance, with predominantly adhesive failures, unlike the cohesive failures in LV and OV groups.

Conclusions:

The layering veneering technique provides superior fracture resistance for zirconia-based crowns compared to overpressing and digital veneering.
Digital veneering resulted in significantly lower fracture resistance, highlighting potential clinical limitations.
Material selection and fabrication technique are critical factors influencing the mechanical integrity and durability of zirconia restorations.