An evaluation of marginal fit of resin single crown manufactured using a dental 3D printer

Kim, Ki-Baek

doi:10.14347/jtd.2022.44.4.126

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…이러한 절삭가공방식의 한계를 보완하는 적층가공방식(additive manufacturing)은 three-dimensional (3D) 프린팅으로도 불리며, 이 방식은 액상이나 분말 형태의 재료에 광원이나 고온 의 레이저를 의도한 부분에만 조사하여 경화시키고 이 과정을 반 복하여 레이어를 층층이 쌓아 구조물을 제작한다(Fig. 1) [12,13].…”

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Evaluation of marginal and internal fit of metal copings fabricated by selective laser melting

et al. 2023

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Methods: An extraoral scanner was used to scan a die of the prepared maxillary right first molar, and the coping was designed using computer-aided design software and saved as an stereo lithography (STL) file. Ten specimens were printed with an SLM-type metal 3D printer (SLM group), and 10 more specimens were fabricated by casting the castable patterns output generated by a digital light processing-type resin 3D printer (casting the 3D printed resin patterns [CRP] group). The fit was measured using the silicon replica technique, and 8 points (A to H) were set per specimen to measure the marginal (points A, H) and internal (points B~G) gaps. The differences among the groups were compared using the Mann-Whitney U-test (α=0.05). Results:The mean of marginal fit in the SLM group was 69.67±18.04 µm, while in the CRP group was 117.10±41.95 µm. The internal fit of the SLM group was 95.18±41.20 µm, and that of the CRP group was 86.35±32 µm. As a result of statistical analysis, there was a significant difference in marginal fit between the SLM and CRP groups (p<0.05); however, there was no significant difference in internal fit between the SLM group and the CRP group (p>0.05). Conclusion:The marginal and internal fit of SLM is within the clinically acceptable range, and it seems to be applicable in terms of fit.

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Section: J Tdunclassified

Evaluation of marginal and internal fit of metal copings fabricated by selective laser melting

et al. 2023

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Survey research to implement a job-based national practical exam for dental technicians

Kim,

Kim

2023

J. Tech. Dent.

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This study proposes measures needed to implement a job-based national practical exam for dental technicians.Methods: For this study, a survey was conducted targeting 244 currently employed individuals. The current national practical test for dental technicians was divided into directions for the job-based practical test, subjects that need improvement among the current practical test subjects, items that need to be reflected in the practical test evaluation for each subject, and subjects that need to be added to the practical test. It comprised ten questions (Cronbach's α=0.801). Results:The following results were obtained. Satisfaction with the current practical test was lower than average. Future improvement should focus on job-based evaluation. The dental ceramic lab technology subject needs to be reorganized urgently, and the tasks that require evaluation for each subject are different. Moreover, if evaluation subjects are added in the future, the introduction of assessment for dental CAD/CAM (computer-aided design/ computer-aided manufacturing) subjects was found to be the most urgent. Conclusion:In this study, the most necessary tasks of the current national practical examination for dental technicians were evaluated and the content needed for future reorganization was investigated. Future tests should be expanded to evaluate critical job areas. Furthermore, it is necessary to open new courses in fields such as CAD/CAM, as they are in high demand in the workplace.

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An evaluation of marginal fit of resin single crown manufactured using a dental 3D printer

Cited by 2 publications

References 13 publications

Evaluation of marginal and internal fit of metal copings fabricated by selective laser melting

Evaluation of marginal and internal fit of metal copings fabricated by selective laser melting

Survey research to implement a job-based national practical exam for dental technicians

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