Marginal and internal discrepancies of zirconia copings: Effects of milling system and finish line design.

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dc.contributor.authorRibeiro, Isabella Lima Arrais
dc.contributor.authorCampos, Fernanda
dc.contributor.authorSousa, Rafael Santiago
dc.contributor.authorAlves, Maria Luiza Lima
dc.contributor.authorRodrigues, Dalton Matos
dc.contributor.authorSouza, Rodrigo Othavio Assunção
dc.contributor.authorBottino, Marco Antonio
dc.date.accessioned2015-06-23T11:18:02Z
dc.date.available2015-06-23T11:18:02Z
dc.date.issued2015-01
dc.description.abstractContext: Discrepancies at the abutment/crown interface can affect the longevity of zirconia restorations. Aim: The aim was to evaluate the marginal and internal discrepancies (MD and ID) of zirconia copings manufactured by two milling systems with different finish lines. Materials and Methods: Three aluminum‑master‑dies (h = 5.5 mm; Ø =7.5 mm; 6°), with different finish lines (large chamfer [LC]; tilted chamfer [TC]; rounded shoulder [RS]) were fabricated. Twenty impressions were made from each master die and poured. Sixty zirconia copings were manufactured and divided according to the factors “finish line” and “milling system” (n = 10): CADLC = Computer‑aided design/computer‑aided manufacturing (CAD/ CAM) + LC; CADTC = CAD/CAM + TC; CADRS = CAD/CAM + RS; MADLC = manually aided design/manually aided manufacturing (MAD/MAM) + LC; MADTC = MAD/MAM + TC; and MADRS = MAD/MAM + RS. For MD analysis, each coping was fixed, and the distance between the external edges of the coping and the edge of the cervical preparation was measured (50 points). Using the same copings, the ID of each coping was evaluated, by the replica technique, at 12 points equally distributed among the regions (n = 10): Ray (R), axial (A), and occlusal (Occl). The measurements were performed by optical microscopy (×250). The data (μm) were subjected to parametric and non‑parametric statistical analyses. Results: For the MAD/MAM system, the “finish line” (P = 0.0001) affected significantly the MD median values (μm): LC = 251.80a, RS = 68.40a and TC = 8.10b (Dunn’s test). For the CAD/CAM system, the median MD values (μm) were not affected by the factor “finish line” (P = 0.4037): LC = 0.82a, RS = 0.52a, and TC = 0.89a. For the ID, it was observed interaction between the finish line types and the region (P = 0.0001) and between region and milling system (P = 0.0031) (RM‑ANOVA). Conclusions: The CAD/CAM system presented lower MD values, regardless the finish line. However, the MAD/MAM system showed ID values smaller than those of CAD/CAM.en_US
dc.identifier.citationRibeiro Isabella Lima Arrais, Campos Fernanda, Sousa Rafael Santiago, Alves Maria Luiza Lima, Rodrigues Dalton Matos, Souza Rodrigo Othavio Assunção, Bottino Marco Antonio. Marginal and internal discrepancies of zirconia copings: Effects of milling system and finish line design. Indian Journal of Dental Research. 2015 Jan-Feb; 26(1): 15-20.en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/158234
dc.language.isoenen_US
dc.source.urihttps://www.ijdr.in/article.asp?issn=0970-9290;year=2015;volume=26;issue=1;spage=15;epage=20;aulast=Arraisen_US
dc.subjectComputer‑aided design/computer‑aided manufacturing systemen_US
dc.subjectinternal discrepancyen_US
dc.subjectmanually aided design/manually aided manufacturing system, marginal discrepancyen_US
dc.subjectreplica techniqueen_US
dc.subject.meshDental Marginal Adaptation
dc.subject.meshDental Prosthesis Design --methods
dc.subject.meshSurface Properties
dc.subject.meshZirconium
dc.titleMarginal and internal discrepancies of zirconia copings: Effects of milling system and finish line design.en_US
dc.typeArticleen_US
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