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Evaluation of the marginal and internal discrepancies of CAD-CAM endocrowns with different cavity depths: An in vitro study

 Yooseok Shin  ;  Sungho Park  ;  Jeong-Won Park  ;  Kwang-Mahn Kim  ;  Young-Bum Park  ;  Byoung-Duck Roh 
 JOURNAL OF PROSTHETIC DENTISTRY, Vol.117(1) : 109-115, 2017 
Journal Title
Issue Date
Cementation ; Computer-Aided Design* ; Crowns* ; Dental Cavity Preparation/methods* ; Dental Marginal Adaptation/standards ; Dental Prosthesis Design/methods* ; Humans ; In Vitro Techniques ; Radiography, Dental/methods ; X-Ray Microtomography
STATEMENT OF PROBLEM: The marginal and internal discrepancies of computer-aided design and computer-aided manufacturing (CAD-CAM) endocrowns are unknown. PURPOSE: The purpose of this in vitro study was to evaluate the marginal and internal discrepancies of endocrowns with different cavity depths by measuring them with microcomputed tomography (μCT). MATERIAL AND METHODS: Endocrowns (n=48) of 2 different cavity depths (2 mm and 4 mm) were fabricated in 2 different chairside CAD-CAM systems (CEREC AC and E4D). A μCT scan was made before and after cementation. For analysis of the marginal and internal discrepancies, reference points were selected in 2-dimensional views of 3 buccolingual cross-sections and 3 mesiodistal cross-sections. To calculate the total discrepancy volume, the μCT sections were reconstructed 3-dimensional views, and changes in volume and surface area were examined. Statistical analysis was performed using 2-way ANOVA with Bonferroni correction (α=.05). RESULTS: An endocrown with a 4-mm cavity showed a larger marginal and internal volume than one with a 2-mm cavity. Cementation did not show significant differences in total discrepancy thickness. Discrepancies on the pulpal floor were largest in other sites. Both chairside CAD-CAM systems showed similar discrepancy in the endocrowns. CONCLUSIONS: Based on the present study, marginal and internal discrepancies increased depending on cavity depth. Cementation did not increase the dimension of the discrepancy between the restoration and the cavity wall. The discrepancy on the pulpal floor appeared to affect these results.
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2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kwang Mahn(김광만) ORCID logo https://orcid.org/0000-0002-5235-0294
Roh, Byoung Duck(노병덕)
Park, Sung Ho(박성호) ORCID logo https://orcid.org/0000-0003-2171-235X
Park, Young Bum(박영범)
Park, Jeong Won(박정원) ORCID logo https://orcid.org/0000-0002-2517-8150
Shin, Yoo Seok(신유석) ORCID logo https://orcid.org/0000-0003-1121-2570
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