대한치과기공학회지 (Journal of Technologic Dentistry)

  • 제40권4호
  • /
  • Pages.209-215
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  • 2018
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  • 1229-3954(pISSN)
  • /
  • 2288-5218(eISSN)
대한치과기공학회 (Korean Academy of Dental Technology)
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적층 가공방식에 따른 고정성 치과보철물의 변연 및 내면 적합도 평가연구

Evaluation the clinical acceptability of the marginal and internal gaps of fixed partial denture fabricated with additive manufacturing technology

  • 김재홍 (동남보건대학교 치기공과) ;
  • 김기백 (대전보건대학교 치기공과)
  • Kim, Jae-Hong (Department of Dental Technology, Dongnam Health University) ;
  • Kim, Ki-Baek (Department of Dental Lab Technology, Daejeon Health Institute of Technology)
  • 투고 : 2018.07.31
  • 심사 : 2018.12.07
  • 발행 : 2018.12.30
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초록

Purpose: The purpose of this study was to evaluate the clinical acceptability of the marginal and internal gap of Co-Cr metal copings fabricated with stereolithography (SLA). Methods: Titanium master dies were milled after scanning of the prepared tooth (n=30). For group I, Co-Cr metal copings were made from conventional lost-wax technique(LWT, n=10). For group II, the master dies were scanned and designed with CAD system. Then, metal copings were milled with Co-Cr(SUB, n=10). For group III(ADD, n=10), the scanning and design procedures were same as group II and burn-out resins were fabricated with SLA device. The marginal and internal discrepancies were measured under an optical microscope(100x) on ten reference points and were statistically analyzed with one-way ANOVA(${\alpha}=.05$). Results: The mean total discrepancies were $53.76{\pm}12.42{\mu}m$ in the LWT group and $69.82{\pm}15.48{\mu}m$ in the ADD group. The SUB group showed the largest total mean value $110.33{\pm}13.77{\mu}m$. There was statistically significant difference between the SUB and the other groups(P<0.05). Conclusion : Co-Cr metal copings fabricated with SLA technology showed clinically acceptable value on marginal and internal gap and there was no statistically significant difference between conventional lost-wax technique and SLA.

키워드

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Figure 1. Milled titanium master model

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Figure 2. Ten reference points for measurement

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Figure 3. Measurement of gaps at margin and internal gaps by optical microscope (magnification x100).

Table 1. Composition of the experimental groups

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Table 2. Mean±SD in(㎛) of gaps for total measurement points of the three production method

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