지르코니아, 유리침투알루미나 및 PFM 전부관 시스템의 파절 경향에 관한 비교연구
A comparative study on the fracture behavior of zironia, glass infiltrated alumina and PFM full crown system
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연구 목적: 본 연구는 지르코니아, 유리침투알루미나 및 금속도재소부용치관의 파절강도를 비교하고자 하였다. 연구 재료 및 방법: 지르코니아, 유리침투알루미나 및 금속도재소부용합금으로 각각 15개의 치관을 제작한 후, 제작된 치관을 장축에 30도 경사지게 제작된 지그에 장착하여 만능시험기로 파절강도를 측정하였으며, 전단결합강도 시험을 위하여 지르코니아, 유리침투알루미나 및 금속도재소부용합금을 5.5 (∅) × 2.5 mm 크기로 제작하고 포세린 분말을 3.5 (∅) × 2.5 mm 크기로 축성한 후 제조사의 설명서에 따라 전기로(Ceramco 7, Dentsply, USA)에서 소결하여 총10개의 시편을 제작하였다. 결과:전부관 형태로 제작한 시편의 파절강도는 금속-도재 시스템이 569.1 ± 61.8 N, 알루미나-도재 시스템이 551.0±76.5 N 및 지르코니아-도재 시스템이 588.3 ± 49.6 N으로 측정되었으며, 각 실험군간 유의한 차이는 없었다(P>.05). 전단결합강도는 금속-도재 시스템이 38.9±5.0 MPa, 알루미나-도재 시스템이 39.4±5.1 MPa, 지르코니아-도재 시스템이 25.5 ± 5.6 MPa로 지르코니아-도재 시스템이 다른 두 시스템 보다 유의하게 낮은 값을 보였다(P<.05). 금속-도재 시스템, 알루미 나-도재 시스템 및 지르코니아-도재 시스템의 각 결합계면을SEM/EDS로 분석한 결과 각 시스템에서 상이한 결합 양상이 관찰되었다. 결론: 본 연구 결과 지르코니아-도재 시스템의 파절강도가 제일 높았으며, 금속-도재 시스템, 알루미나-도재 시스템 순서로 나타났으며, 전단결합강도는 알루미나-도재 시스템이 제일 높았고 금속-도재 시스템, 지르코니아-도재 시스템 순서으로 나타났다.
Abstract
Purpose: The purpose of this study was to compare the fracture behavior of Zironia, glass infiltrated Alumina and PFM full crown system. Materials and methods: Fifteen crowns for each of 3 experimental groups (Zironia, glass infiltrated Alumina and PFM full crown) were made by the conventional method. The crowns mounted on the testing jig were inclined in 30 degrees to the long axis of the tooth and the universal testing machine was used to measure the fracture strength. Results: 1. The mean fracture strengths were 588.3 ± 49.6 MPa for zirconia system, 569.1 ± 61.8 MPa for PFM system and 551.0 ± 76.5 MPa for glass-infiltrated alumina system (P>.05). 2. The mean shear bond strengths were 25.5 ± 5.6 MPa for zirconia system, 38.9 ± 5.0 MPa for Ni-Cr alloy system and 39.4 ± 5.1 MPa for glass-infiltrated alumina system. 3. The chemical bonding was observed at interfaces between PFM or glass-infiltrated alumina and veneering porcelain, however, no chemical bonding was observed at interface between zirconia and veneering porcelain. Conclusion: With the study, the fracture strengths of PFM crown system had a higher fracture strength than conventional zirconia system crown and glass-infiltrated alumina crowns. and than the shear bond strengths glass-infiltrated alumina system had a higher shear bond strength than conventional PFM system and zirconia system.
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