Tags

Type your tag names separated by a space and hit enter

Evaluation of a conditioning method to improve core-veneer bond strength of zirconia restorations.
J Prosthet Dent. 2012 Jun; 107(6):380-7.JP

Abstract

STATEMENT OF PROBLEM

The high strength and fracture toughness of zirconia have supported its extensive application in esthetic dentistry. However, the fracturing of veneering porcelains remains one of the primary causes of failure.

PURPOSE

The purpose of this study was to evaluate, with shear bond strength testing, the effect of a simple and novel surface conditioning method on the core-veneer bond strength of a zirconia ceramic system.

MATERIAL AND METHODS

The shear bond strength of a zirconia core ceramic to the corresponding veneering porcelain was tested by the Schmitz-Schulmeyer method. Thirty zirconia core specimens (10 × 5 × 5 mm) were layered with a veneering porcelain (5 × 3 × 3 mm). Three different surface conditioning methods were evaluated: polishing with up to 1200 grit silicon carbide paper under water cooling, airborne-particle abrasion with 110 μm alumina particles, and modification with zirconia powder coating before sintering. A metal ceramic system was used as a control group. All specimens were subjected to shear force in a universal testing machine at a crosshead speed of 0.5 mm/min. The shear bond strength values were analyzed with 1-way ANOVA and Tukey's post hoc pairwise comparisons (α=.05). The fractured specimens were examined with a scanning electron microscope to observe the failure mode.

RESULTS

The mean (SD) shear bond strength values in MPa were 47.02 (6.4) for modified zirconia, 36.66 (8.6) for polished zirconia, 39.14 (6.5) for airborne-particle-abraded zirconia, and 46.12 (7.1) for the control group. The mean bond strength of the control (P=.028) and modified zirconia groups (P=.014) was significantly higher than that of the polished zirconia group. The airborne-particle-abraded group was not significantly different from any other group. Scanning electron microscopy evaluation showed that cohesive fracture in the veneering porcelain was the predominant failure mode of modified zirconia, while the other groups principally fractured at the interface.

CONCLUSIONS

Modifying the zirconia surface with powder coating could significantly increase the shear bond strength of zirconia to veneering porcelain.

Authors+Show Affiliations

Department of Prosthodontics State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, P.R. China.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22633594

Citation

Teng, Jili, et al. "Evaluation of a Conditioning Method to Improve Core-veneer Bond Strength of Zirconia Restorations." The Journal of Prosthetic Dentistry, vol. 107, no. 6, 2012, pp. 380-7.
Teng J, Wang H, Liao Y, et al. Evaluation of a conditioning method to improve core-veneer bond strength of zirconia restorations. J Prosthet Dent. 2012;107(6):380-7.
Teng, J., Wang, H., Liao, Y., & Liang, X. (2012). Evaluation of a conditioning method to improve core-veneer bond strength of zirconia restorations. The Journal of Prosthetic Dentistry, 107(6), 380-7. https://doi.org/10.1016/S0022-3913(12)60095-X
Teng J, et al. Evaluation of a Conditioning Method to Improve Core-veneer Bond Strength of Zirconia Restorations. J Prosthet Dent. 2012;107(6):380-7. PubMed PMID: 22633594.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of a conditioning method to improve core-veneer bond strength of zirconia restorations. AU - Teng,Jili, AU - Wang,Hang, AU - Liao,Yunmao, AU - Liang,Xing, PY - 2012/5/29/entrez PY - 2012/5/29/pubmed PY - 2012/12/12/medline SP - 380 EP - 7 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 107 IS - 6 N2 - STATEMENT OF PROBLEM: The high strength and fracture toughness of zirconia have supported its extensive application in esthetic dentistry. However, the fracturing of veneering porcelains remains one of the primary causes of failure. PURPOSE: The purpose of this study was to evaluate, with shear bond strength testing, the effect of a simple and novel surface conditioning method on the core-veneer bond strength of a zirconia ceramic system. MATERIAL AND METHODS: The shear bond strength of a zirconia core ceramic to the corresponding veneering porcelain was tested by the Schmitz-Schulmeyer method. Thirty zirconia core specimens (10 × 5 × 5 mm) were layered with a veneering porcelain (5 × 3 × 3 mm). Three different surface conditioning methods were evaluated: polishing with up to 1200 grit silicon carbide paper under water cooling, airborne-particle abrasion with 110 μm alumina particles, and modification with zirconia powder coating before sintering. A metal ceramic system was used as a control group. All specimens were subjected to shear force in a universal testing machine at a crosshead speed of 0.5 mm/min. The shear bond strength values were analyzed with 1-way ANOVA and Tukey's post hoc pairwise comparisons (α=.05). The fractured specimens were examined with a scanning electron microscope to observe the failure mode. RESULTS: The mean (SD) shear bond strength values in MPa were 47.02 (6.4) for modified zirconia, 36.66 (8.6) for polished zirconia, 39.14 (6.5) for airborne-particle-abraded zirconia, and 46.12 (7.1) for the control group. The mean bond strength of the control (P=.028) and modified zirconia groups (P=.014) was significantly higher than that of the polished zirconia group. The airborne-particle-abraded group was not significantly different from any other group. Scanning electron microscopy evaluation showed that cohesive fracture in the veneering porcelain was the predominant failure mode of modified zirconia, while the other groups principally fractured at the interface. CONCLUSIONS: Modifying the zirconia surface with powder coating could significantly increase the shear bond strength of zirconia to veneering porcelain. SN - 1097-6841 UR - https://www.unboundmedicine.com/medline/citation/22633594/Evaluation_of_a_conditioning_method_to_improve_core_veneer_bond_strength_of_zirconia_restorations_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-3913(12)60095-X DB - PRIME DP - Unbound Medicine ER -