Earticle

초록

영어

Purpose: This study aimed to analyze and compare the marginal and internal fit of zirconia crowns fabricated using three types of milling tools with different durations of use (0, 50, and >100 hours). Methods: Zirconia crowns were designed using computer-aided design software, and the design files were extracted. Zirconia blocks (Luxen, Dentalmax) were milled using a five-axis milling machine (DWX-52D, Roland). Crowns were fabricated using unused milling tools, tools used for 50 clinical hours, and tools used for >100 clinical hours (n=12). The morphology of the milling tools was examined using a scanning electron microscope (VEGA, TESCAN). The marginal and internal fit of the fabricated zirconia crowns was evaluated using a D2000 scanner (3Shape) via the scanning method. Differences in fit among the crowns fabricated with tools of various usage durations were analyzed using one-way analysis of variance, with post-hoc analysis conducted through Tukey’s honest significant difference test (α=0.05). Results: Significant differences in zirconia crown fit were observed among the three tooluse groups (p<0.001). Milling tools used for >100 hours produced crowns with significantly lower marginal fit (p<0.05). Similarly, reproducibility in the 100-hour group was significantly reduced (p<0.05). Conclusion: Repeated clinical use of milling tools over extended periods may adversely affect the marginal fit and reproducibility of zirconia crowns.

목차

Abstract
INTRODUCTION
MATERIALS AND METHODS
1. Specimen preparation
2. Marginal and internal fit evaluation
3. Statistical analysis
RESULTS
1. Marginal and internal fit
2. Fabrication precision
3. Microscopic structural observation
DISCUSSION
CONCLUSIONS
FUNDING
ACKNOWLEDGEMENTS
CONFLICT OF INTEREST
ORCID
REFERENCES

키워드

저자

• Seong Tae Lee [ Department of Biohealth Convergence, Meister Master’s Course, Daegu Health College, Daegu, Korea ]
• KeunBaDa Son [ Advanced Dental Device Development Institute (A3DI), School of Dentistry, Kyungpook National University Daegu, Korea ]
• Min-Jeong Kim [ Department of Biohealth Convergence, Meister Master’s Course, Daegu Health College, Daegu, Korea ]
• Ki-Whan Chang [ Department of Biohealth Convergence, Meister Master’s Course, Daegu Health College, Daegu, Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  대한치과기공학회지 [THE JOURNAL OF KOREAN ACADEMY OF DENTAL TECHNOLOGY]

• 간기

  계간

• pISSN

  1229-3954

• eISSN

  2288-5218

• 수록기간

  1979~2026

• 등재여부

  KCI 등재

• 십진분류

  KDC 515 DDC 617