Shear bond strength of veneering porcelain to zirconia and metal cores
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STATEMENT OF PROBLEM. Zirconia-based restorations have the common technical complication of delamination, or porcelain chipping, from the zirconia core. Thus the shear bond strength between the zirconia core and the veneering porcelain requires investigation in order to facilitate the material’s clinical use. PURPOSE. The purpose of this study was to evaluate the bonding strength of the porcelain veneer to the zirconia core and to other various metal alloys (high noble metal alloy and base metal alloy). MATERIAL AND METHODS. 15 rectangular (4x4x9mm) specimens each of zirconia (Cercon), base metal alloy (Tillite), high noble metal alloy (Degudent H) were fabricated for the shear bond strength test. The veneering porcelain recommended by the manufacturer for each type of material was fired to the core in thickness of 3mm. After firing, the specimens were embedded in the PTFE mold, placed on a mounting jig, and subjected to shear force in a universal testing machine. Load was applied at a crosshead speed of 0.5mm/min until fracture. The average shear strength (MPa) was analyzed with the oneway ANOVA and the Tukey’s test (α= .05). The fractured specimens were examined using SEM and EDX to determine the failure pattern. RESULTS. The mean shear strength (± SD) in MPa was 25.43 (± 3.12) in the zirconia group, 35.87 (± 4.23) in the base metal group, 38.00 (± 5.23) in the high noble metal group. The ANOVA showed a significant difference among groups, and the Tukey’s test presented a significant difference between the zirconia group and the metal group. Microscopic examination showed that the failure primarily occurred near the interface with the residual veneering porcelain remaining on the core. CONCLUSION. There was a significant difference between the metal ceramic and zirconia ceramic group in shear bond strength. There was no significant difference between the base metal alloy and the high noble metal alloy.
Abstract
STATEMENT OF PROBLEM. Zirconia-based restorations have the common technical complication of delamination, or porcelain chipping, from the zirconia core. Thus the shear bond strength between the zirconia core and the veneering porcelain requires investigation in order to facilitate the material’s clinical use. PURPOSE. The purpose of this study was to evaluate the bonding strength of the porcelain veneer to the zirconia core and to other various metal alloys (high noble metal alloy and base metal alloy). MATERIAL AND METHODS. 15 rectangular (4x4x9mm) specimens each of zirconia (Cercon), base metal alloy (Tillite), high noble metal alloy (Degudent H) were fabricated for the shear bond strength test. The veneering porcelain recommended by the manufacturer for each type of material was fired to the core in thickness of 3mm. After firing, the specimens were embedded in the PTFE mold, placed on a mounting jig, and subjected to shear force in a universal testing machine. Load was applied at a crosshead speed of 0.5mm/min until fracture. The average shear strength (MPa) was analyzed with the oneway ANOVA and the Tukey’s test (α= .05). The fractured specimens were examined using SEM and EDX to determine the failure pattern. RESULTS. The mean shear strength (± SD) in MPa was 25.43 (± 3.12) in the zirconia group, 35.87 (± 4.23) in the base metal group, 38.00 (± 5.23) in the high noble metal group. The ANOVA showed a significant difference among groups, and the Tukey’s test presented a significant difference between the zirconia group and the metal group. Microscopic examination showed that the failure primarily occurred near the interface with the residual veneering porcelain remaining on the core. CONCLUSION. There was a significant difference between the metal ceramic and zirconia ceramic group in shear bond strength. There was no significant difference between the base metal alloy and the high noble metal alloy.
참고문헌 (29)
- Tan K, "A systemic review of the survival and complication rates of fixed partial dentures (FPDs) after an observation period of at least 5 years", Clin Oral Implants Res, 15, pp.654~666 (2004)
- Raigrodski AJ, "Contemporary materials and technologies for allceramic fixed partial dentures: a review of the literature", J Prosthet Dent, 92, pp.557~562 (2004)
- Guazzato M, "Strength, fracture toughness and microstructure of a selection of all-ceramic materials. Part II. Zirconia based dental ceramics", Dent Mater, 20, pp.449~456 (2004)
- Tinschert J, "Lifetime of alumina-and zircoina ceramics used for crown and bridge restorations", J Biomed Mater Res B Appl Biomater, 80, pp.317~321 (2007)
- Sundh A, "A comparison of fracture strength of yttriumoxide- partially-stabilized zirconia ceramic crowns with varying core thickness, shapes and veneer ceramics", J Oral Rehabil, 31, pp.682~688 (2004)
- Sailer I, "A Systematic review of the survival and complication rates of all-ceramic and metal-ceramic reconstructions after an observation period of at least 3 years. Part II: Fixed partial prostheses", Clin Oral Implants Res, 18, pp.86~96 (2007)
- Sailer I, "Prospective clinical study of zirconia posterior fixed partial dentures: 3-year follow-up", Quintessence Int, 37, pp.685~693 (2006)
- Raigrodski AJ, "The efficacy of posterior threeunit zirconium-oxide-based ceramic fixed partial denture prostheses: a prospective clinical pilot study", J Prosthet Dent, 96, pp.237~244 (2006)
- Guazzato M, "Strength, reliability, and mode of fracture of bilayered porcelain", core ceramics, 2004, pp.17, 142~149
- Anusavice KJ, "Phillips’science of dental materials. 11th Ed", pp.621~654 (2003), W.B. Saunders
- Ozcan M, "Clinical study on the reasons and location of the failures of metal-ceramic restorations and survival of repairs", Int J Prosthodont, 15, pp.299~302 (2002)
- Craig RG, "Restorative dental materials 11th ed" (2002), Mosby
- "ISO 9693 Metal-ceramic bond characterization (Schwickerath crack initiation test) Geneva, Switzerland: International Organization for Standardization", ~ (1999)
- Isgro G, "The influence of the veneering porcelain and different surface treatments on the biaxial flexural strength of a heat-pressed ceramic", J Prosthet Dent, 90, pp.465~473 (2003)
- Hara AT, "Influence of crosshead speed on resin-dentin shear bond strength", Dent Mater, 17, pp.165~169 (2001)
- Albakry M, "Fracture toughness and hardness evaluation of three pressable all-ceramic dental materials", J Dent, 31, pp.181~188 (2003)
- Al-Dohan HM, "Shear strength of core-veneer interface in bi-layered ceramics", J Prosthet Dent, 91, pp.349~355 (2004)
- Dündar M, "Bond strengths of veneering ceramics to reinforced ceramic core materials", Int J Prosthodont, 18, pp.71~72 (2005)
- Dündar M, "Comparison of two bond strength testing methodologies for bilayered all-ceramics", Dent Mater, 23, pp.630~636 (2007)
- Guess PC, "Shear bond strengths between different zirconia cores and veneering ceramics and their susceptibility to thermocycling", Dent Mater, 24, pp.1556~1567 (2008)
- White SN, "Flexural strength of a layered zirconia and porcelain dental allceramic system", J Prosthet Dent, 94, pp.125~131 (2005)
- Aboushelib MN, "Microtensile bond strength of different components of core veneered all-ceramic restorations", Dent Mater, 21, pp.984~991 (2005)
- Aboushelib MN, "Microtensile bond strength of different components of core veneered all-ceramic restorations. Part II: zirconia veneering ceramics", Dent Mater, 22, pp.857~863 (2006)
- de Melo RM, "Shear bond strengths of a ceramic system to alternative metal alloys", J Prosthet Dent, 93, pp.64~69 (2005)
- Mecholsky J, "Fractography: Determining the sites of fracture initiation", Dent Mater, 11, pp.113~116 (1995)
- Kelly JR, "Fracture surface analysis of dental ceramics: clinically failed restorations", Int J Prosthodont, 3, pp.430~440 (1990)
- Quinn JB, "Influence of microstructure and chemistry on the fracture toughness of dental ceramics", Dent Mater, 19, pp.603~611 (2003)
- Aboushelib MN, "Microtenisile bond strength of different componentsof core veneered all-ceramic restorations. Part 3: double veneer tenchnique", J Prosthodont, 17, pp.9~13 (2008)
- Sobrinho LC, "Investigation of the dry and wet fatique properties of three all-ceramic crown systems", Int J Prosthodont, 11, pp.255~262 (1998)