CAD/CAM 및 카피밀링 시스템을 이용하여 제작한 구치부 3-유닛 고정성 국소의치의 파절강도
Fracture Strength of All-Ceramic 3-Unit Fixed Partial Dentures Manufactured by CAD/CAM and Copy-Milling Systems
강후원, 김희진, 김장주, 고명원,
소속 상세정보
강후원 ( Kang Hoo-Won ) - 동아인재대학교 치기공과
김희진 ( Kim Hee-Jin ) - 부산가톨릭대학교 치기공학과
김장주 ( Kim Jang-Ju ) - 광양보건대학 치기공과
고명원 ( Ko Myung-Won ) - 광양보건대학 치기공과
KMID : 0362120120340020095
Abstract
Purpose: Fracture strength of all-ceramic 3-unit fixed partial dentures manufactured by CAD/CAM and copymilling systems were evaluated.
Methods: Zirconia cores were made by milling the pre-sintered zirconia block by CAD/CAM or copy milling
method followed by subsequent sintering. By building-up the corresponding porcelains on the core, all-ceramic bridges were fabricated, and those were evaluated in comparison with PFM fixed partial denture.
Results: During the flexural test of the 3-unit PFM bridge, the porcelain started to chip or break at 507.28(62.82)kgf and the metal framework did not break until the maximum load level of 800kgf which was set in the testing instrument of this study. However, among all-ceramic restoration test groups, Everest(EV) group showed a peeling off or breakage of the porcelain from 365.64( 64.96)kgf and the core was broken at 491.77( 55.62)kgf. Those values of Zirkonzahn(ZR) were 431.03( 58.47)kgf and 602.74( 48.44)kgf, respectively. The break strength of the porcelain of PFM(PM) group was significantly higher than that of EV (p<0.05) group and there was no significant difference when comparing to that of ZR (p>0.05). ZR group showed higher break strength than that of EV group however there was no significant difference (p>0.05). The break strength of cores were in the increasing order of EV < ZR < PM (p<0.05).
Conclusion: We could find that even though the PM group fractured at much higher value than all-ceramic cores,
the breakage values of the porcelain of PM group with crack formation or delamination, which will be regarded as clinical failure, was significantly higher than that of EV group and not significantly higher than that of ZR group at p-values of 0.05. The break strength of ZR group was higher than that of EV group at an insignificant level(p>0.05).
키워드
fracture strength; all-ceramic 3-unit fixed partial dentures; CAD/CAM system; copy-milling system
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