Marginal and internal fit of feldspathic ceramic CAD/CAM crowns fabricated via different extraoral digitization methods: a micro-computed tomography analysis.

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Abstrakt

Tytuł:: Marginal and internal fit of feldspathic ceramic CAD/CAM crowns fabricated via different extraoral digitization methods: a micro-computed tomography analysis.
Autorzy:: Oğuz Eİ; Department of Prosthodontics, Faculty of Dentistry, Ankara University, İncitaş Street, Emniyet District, Box 06560, Yenimahalle, Ankara, Turkey. .
Kılıçarslan MA; Department of Prosthodontics, Faculty of Dentistry, Ankara University, İncitaş Street, Emniyet District, Box 06560, Yenimahalle, Ankara, Turkey.
Ocak M; Department of Anatomy, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Bilecenoğlu B; Deparment of Anatomy, Faculty of Medicine, Medipol University, Ankara, Turkey.
Ekici Z; Private Practice, Istanbul, Turkey.
Źródło:: Odontology [Odontology] 2021 Apr; Vol. 109 (2), pp. 440-447. Date of Electronic Publication: 2020 Oct 26.
Typ publikacji:: Journal Article
Język:: English
Imprint Name(s):: Original Publication: Tokyo : Springer-Verlag Tokyo, c2001-
MeSH Terms:: Dental Marginal Adaptation*
Dental Prosthesis Design*
Computer-Aided Design ; Crowns ; Dental Porcelain ; X-Ray Microtomography
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Contributed Indexing:: Keywords: CAD/CAM; Ceramic crowns; Internal adaptation; Marginal adaptation; Micro-CT
Substance Nomenclature:: 12001-21-7 (Dental Porcelain)
Entry Date(s):: Date Created: 20201026 Date Completed: 20210316 Latest Revision: 20210316
Update Code:: 20240105
DOI:: 10.1007/s10266-020-00560-6
PMID:: 33104952
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The aim of this study was to compare the fit of feldspathic ceramic crowns fabricated via 3 different extraoral digitizing methods. Twelve maxillary first premolars were prepared and 36 single crowns were fabricated via 3 extraoral digitizing methods using a laboratory scanner (n = 12): (1) scanning the typodont (ST [control] group); (2) scanning the impression (SI group); (3) scanning the stone cast (SC group). Micro-computed tomography was used to calculate two-dimensional marginal-internal gap and the three-dimensional volumetric gap between the crowns and their corresponding dies. The measured gaps were divided into 6 location categories as follows: marginal gap (MG), finish line gap (FLG), axial wall gap (AWG), cuspal gap (CG), proximal transition gap (PTG), and central fossa gap (CFG). The correlation between each of the 3 extraoral digitizing methods and the adaptation status of the crown margins were also evaluated. The Wilcoxon signed-rank test, Spearman's rank test, and Chi-square test were used for data analysis (α = 0.05). The marginal gaps in the ST, SI, and SC groups differed significantly (24, 198 and 117.6 µm, respectively) (p < 0.05). Significant differences were found between the groups with regard to internal gap measurements, with SI representing higher gap measurements at FLG, PTG and CFG locations (p < 0.05). 3D volumetric gap measurements did not differ significantly (p > 0.05). Under-extended margins observed in the SI and SC groups were correlated with the digitizing method (Cramer's V-square: 0.14). When performing extraoral digitalization, clinicians should choose to scan the stone cast as scanning the stone cast resulted in better internal and marginal fit compared to scanning the impression.

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