열 순환이 세라믹 코어 - 도재 비니어의 전단결합강도에 미치는 영향 (The effect of thermocycling on the shear-bond strength of ceramic core - porcelain veneer)

서지정보

· 발행기관 : 대한치과재료학회
· 수록지 정보 : 대한치과재료학회지 / 40권 / 2호 / 87 ~ 94페이지
· 저자명 : 김정미, 배지명, 오승한

초록

This study is to evaluate the effect of thermocycling on the shear-bond strength between ceramic core and veneering ceramic. Three kinds of ceramic system (ICE Zircon, IPS e.max, and Lava Zirconia) were used to prepare ceramic core-porcelain veneer system and NiCrMo bonding alloy(Dentarium, Germany) were used to make metal ceramic system(MCS) as a control. 10 specimens per each experimental group were fabricated according to the Schmitz-schulmeyer system. Prepared samples were put into the thermocycling system(KD-TCS30, Kwangduk P.A, Korea). The samples were circulated between 5°C and 55°C bath with the interval of 30 seconds. The times of circulation in this research are 20,000 and 50,000, respectively. The results of shear-bond strength showed that there was a significant difference between thermocycled groups and non-thermocycled groups(P<0.05). In group of non-thermocycled groups, the values of MCS and ICE Zircon were significantly higher than those of IPS e.max and Lava Zirconia. However, on the condition of thermocycled groups, Lava only showed significant reduction of bond stregnth with proportional to the circulation time(P<0.05) and other groups did not show any significant difference between conditions(P>0.05). In terms of failure mode of specimens, all experimental groups showed combined failure mode including adhesive and cohesive failure. Therefore, among three zirconia core materials, ICE Zircon indicated excellent shear-bond strength after 50000 thermocycling process and is expected to be one of more suitable combinatory system compared to MCS system.

영어초록

This study is to evaluate the effect of thermocycling on the shear-bond strength between ceramic core and veneering ceramic. Three kinds of ceramic system (ICE Zircon, IPS e.max, and Lava Zirconia) were used to prepare ceramic core-porcelain veneer system and NiCrMo bonding alloy(Dentarium, Germany) were used to make metal ceramic system(MCS) as a control. 10 specimens per each experimental group were fabricated according to the Schmitz-schulmeyer system. Prepared samples were put into the thermocycling system(KD-TCS30, Kwangduk P.A, Korea). The samples were circulated between 5°C and 55°C bath with the interval of 30 seconds. The times of circulation in this research are 20,000 and 50,000, respectively. The results of shear-bond strength showed that there was a significant difference between thermocycled groups and non-thermocycled groups(P<0.05). In group of non-thermocycled groups, the values of MCS and ICE Zircon were significantly higher than those of IPS e.max and Lava Zirconia. However, on the condition of thermocycled groups, Lava only showed significant reduction of bond stregnth with proportional to the circulation time(P<0.05) and other groups did not show any significant difference between conditions(P>0.05). In terms of failure mode of specimens, all experimental groups showed combined failure mode including adhesive and cohesive failure. Therefore, among three zirconia core materials, ICE Zircon indicated excellent shear-bond strength after 50000 thermocycling process and is expected to be one of more suitable combinatory system compared to MCS system.

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