• Title/Summary/Keyword: 전장도재

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The effet of cooling rate on the residual stresses in the veneer ceramics of zirconia-ceramic restorations: a literature review (냉각속도가 지르코니아-도재 수복물의 전장도재 내 잔류응력에 미치는 효과에 관한 문헌고찰)

  • Chang, Jea-Seung;Kim, Sunjai
    • The Journal of Korean Academy of Prosthodontics
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    • v.52 no.2
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    • pp.136-142
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    • 2014

  • Nowadays, dental zirconia is widely used as a framework material for a fixed dental prosthesis as well as a single restoration. However, clinical studies have reported high incidence of veneer chipping of zirconia-ceramic restorations compared to that of metal-ceramics. Several factors were raised as the possible causes of veneer ceramic chipping, however, it is still in debate. Recently, residual stresses in the veneer ceramics after cooling process gathers attention as one possible cause of chipping and many studies reported that the rate of cooling significantly influenced the types and the amount of residual stress. The purpose of current review was to briefly describe the effect of cooling rate on the residual stress in zirconia-ceramics. It was also described that the different behavior of residual stress between zirconia-ceramics and metal-ceramics following different cooling rate.

  • https://doi.org/10.4047/jkap.2014.52.2.136 인용 PDF KSCI

Effect of glass-infiltration treatments on the shear bond strength between zirconia and ultra low-fusing porcelain veneer (글라스 용융침투 처리가 지르코니아와 초저온 소성 도재와의 전단결합강도에 미치는 영향)

  • Yim, Eun-Kyung;Park, Sang-Won
    • The Journal of Korean Academy of Prosthodontics
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    • v.56 no.4
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    • pp.269-277
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    • 2018

  • Purpose: This study examined the effects of glass infiltration treatments on the shear bond strength (SBS) between zirconia core and ultra low-fusing porcelain veneer. Materials and methods: The zirconia specimens were classified into 4 groups (n = 12): Untreated zirconia (group Z), zirconia coated ZirLiner (group ZL), glass-infiltrated zirconia (group ZG), glass-infiltrated and sandblasted zirconia (group ZGS). A cylinder of ultra low-fusing veneer porcelain was build up on each disk ($6mm{\times}3mm$). SBS was measured using a universal testing machine. Scanning electron microscope and Energy Dispersive X-ray spectroscopy were used to evaluate the surface of zirconia and failure pattern after SBS. Results: SBS value of group ZGS was significantly lower than that of other groups (P < .05). No significant differences were detected among group ZL, group Z and group ZG. Conclusion: Glass infiltration is not effective to the bond strength between zirconia and ultra low-fusing porcelain veneer. Sandblasting also dramatically decreased the bonding strength.

  • https://doi.org/10.4047/jkap.2018.56.4.269 인용 PDF KSCI

Porcelain Fracture in Metal Ceramic, All ceramic and Zirconia restoration (금속도재, 전장도재, 지르코니아 수복물에서의 도재 파절)

  • Cheolyeon Kim
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.32 no.2
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    • pp.46-53
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    • 2023

  • Porcelain fractures associated with metal ceramic(MC), all ceramic (AC), and zirconia restorations are common complications. Several factors of fracture are suggested; Property of materials, Design of the coping for metal ceramic, fabrication techniques, supporting structure, occlusal force, parafunctional habit are being considered. In this article, these factors are discussed in detail.

  • https://doi.org/10.15522/jkaed.2023.32.2.46 인용 PDF

A Study on the Shear Bond Strength of Veneering Ceramics to the Lithium Disilicate (IPS e.max CAD) Core (Lithium Disilicate (IPS e.max CAD) 코어와 전장 도재 사이의 전단결합강도에 관한 연구)

  • Kim, Ki-Baek;Kim, Jae-Hong
    • Journal of dental hygiene science
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    • v.13 no.3
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    • pp.290-295
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    • 2013

  • The purpose of this study was to investigate the shear bond strength between various commercial all-ceramic system core and veneering ceramics, and evaluate the clinical stability by comparing the conventional metal ceramic system. The test samples were divided into three groups: Ni-Cr alloy (metal bond), yttria-stabilized, tetragonal zirconia polycrystal (Y-TZP) (zirconia bond), lithium disilicate (lithium disilicate bond). The veneering porcelain recommended by the manufacturer for each type of material was fired to the core. After firing, the specimens were subjected to shear force in a universal testing machine. Load was applied at a crosshead speed of 0.50 mm/min until failure. Average shear strengths (mega pascal) were analyzed with a one-way analysis of variance and the Tukey test (${\alpha}$=0.05). The mean shear bond strength${\pm}$SD in MPa was $44.79{\pm}2.31$ in the Ni-Cr alloy group, $28.32{\pm}4.41$ in the Y-TZP group, $15.91{\pm}1.39$ in the Lithium disilicate group. The ANOVA showed a significant difference among groups (p<0.05). None of the all-ceramic system core and veneering ceramics could attain the high bond strength values of the metal ceramic combination.

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