Format

Send to

Choose Destination
J Conserv Dent. 2019 Jan-Feb;22(1):59-63. doi: 10.4103/JCD.JCD_426_18.

Effect of different core design made of computer-aided design/computer-aided manufacturing system and veneering technique on the fracture resistance of zirconia crowns: A laboratory study.

Author information

1
Department of Fixed Prosthodontics, Faculty of Dentistry, Damascus University, Damascus, Syria.
2
Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh, Saudi Arabia.
3
Department of Prosthodontics, School of Dentistry, Ibb University, Ibb, Yemen.
4
Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia.
5
Department of Preventive Dental Sciences, Dar Al-Uloom University, Riyadh, Saudi Arabia.

Abstract

Background:

It is unclear how the different core designs made of computer-aided design/computer-aided manufacturing (CAD/CAM) system and veneering techniques affect the fracture resistance of endodontically treated teeth.

Aim:

The aim of this in vitro study is to investigate the effect of different core designs made of CAD/CAM system and veneering techniques on the fracture resistance of zirconia ceramic crowns.

Materials and Methods:

Two types of zirconia copings were designed; the first one with circumferential 0.5-mm chamfer and the second one with circumferential 1-mm deep chamfer. The core specimens (in subgroups) were veneered anatomically with either a layering technique (hand-layer) or with press-on technique resulting in four test groups (n = 12). All crowns were then cemented using self-adhesive resin cement. After that, all specimens were loaded in a universal testing machine until fractured.

Statistical Analysis:

Data were then analyzed with two-way analysis of variance (ANOVA) (α =0.05).

Results:

Mean (standard deviation) failure loads for groups ranged from 2412.7 N (±624.6) to 3020.1 N (±1099.8). Two-way ANOVA revealed no statistically significant differences among groups (P > 0.05). Almost all groups showed cohesive failure in the veneering ceramic.

Conclusions:

Within the limitations of this laboratory study, neither the core design nor the veneering technique affected the fracture resistance of all-ceramic crowns significantly.

KEYWORDS:

All-ceramic; computer aided design/computer-aided manufacturing; core design; fracture resistance; press on

Supplemental Content

Full text links

Icon for Medknow Publications and Media Pvt Ltd Icon for PubMed Central
Loading ...
Support Center