J Korean Acad Prosthodont.
2020 Oct;58(4):313-320. 10.4047/jkap.2020.58.4.313.
Effect of machining precision of single ceramic restorations on the marginal and internal fit
- Affiliations
-
- 1Department of Dental Science, Graduate School, Kyungpook National University, Daegu, Republic of Korea
- 2Advanced Dental Device Development Institute (A3DI), Kyungpook National University, Daegu, Republic of Korea
- 3Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
- KMID: 2508373
- DOI: http://doi.org/10.4047/jkap.2020.58.4.313
Abstract
- Purpose
The purpose of this study was to evaluate the machining precision and the marginal and internal fit of single restorations fabricated with three types of lithium disilicate ceramic blocks and to evaluate the correlation.
Materials and methods
Single restorations were designed using a CAD software program. The crown designed model file was extracted from the CAD software program. Three types of lithium disilicate blocks (Rosetta; HASS, IPS e.max CAD; Ivoclar vivadent, VITA Suprinity; VITA) were milled using a milling machine. For the fabrication of the crown scanned model file, the intaglio surface of the restoration was digitized using a contact scanner. Then, using the three-dimensional inspection software (Geomagic control X; 3D Systems), the process of the overlap of the crown designed model and the scanned model and 3-dimensional analysis was conducted. In addition, the marginal and internal fit of the crowns was evaluated by a silicone replication method. The difference among three types of single ceramic crown was analyzed using a Kruskal-Wallis H test, and Spearman correlation analysis was performed to analyze the correlation between machining precision and fitness (α=.05)
Results
There was a significant difference in the machining precision and the marginal and internal fit according to the type of ceramic block (P<.001). In addition, the machining precision and the marginal and internal fit were positively correlated (P<.001).
Conclusion
The marginal fit of crowns fabricated according to the types of ceramic blocks was within the clinically acceptable range (< 120 µm), so it can be regarded as appropriate machining precision applicable to all clinical as aspects in terms of the marginal fit.
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