Brasil | Artigo
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorUniversidade Federal de Sergipe (UFS)
dc.contributorAcad Med Ctr Groningen
dc.date.accessioned2014-05-20T15:27:54Z
dc.date.accessioned2022-10-05T16:46:06Z
dc.date.available2014-05-20T15:27:54Z
dc.date.available2022-10-05T16:46:06Z
dc.date.created2014-05-20T15:27:54Z
dc.date.issued2007-07-01
dc.identifierQuintessence International. Hanover Park: Quintessence Publishing Co Inc., v. 38, n. 7, p. E425-E432, 2007.
dc.identifier0033-6572
dc.identifier1936-7163
dc.identifierhttp://hdl.handle.net/11449/37824
dc.identifierWOS:000247927300022
dc.identifier2-s2.0-34548842789
dc.identifier9234456003563666
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3909274
dc.description.abstractObjective: the aim of this investigation was to evaluate the cervical adaptation of metal crowns under several conditions, namely (1) variations in the cervical finish line of the preparation, (2) application of internal relief inside the crowns, and (3) cementation using different luting materials. Method and Materials: One hundred eighty stainless-steel master dies were prepared simulating full crown preparations: 60 in chamfer (CH), 60 in 135-degree shoulder (OB), and 60 in rounded shoulder (OR). The finish lines were machined at approximate dimensions of a molar tooth preparation (height: 5.5 mm; cervical diameter: 8 mm; occlusal diameter: 6.4 mm; taper degree: 6; and cervical finish line width: 0.8 mm). One hundred eighty corresponding copings with the same finish lines were fabricated. A 30-mu m internal relief was machined 0.5 mm above the cervical finish line in 90 of these copings. The fit of the die and the coping was measured from all specimens (L0) prior to cementation using an optical microscope. After manipulation of the 3 types of cements (zinc phosphate, glass-ionomer, and resin cement), the coping was luted on the corresponding standard master die under 5-kgf loading for 4 minutes. Vertical discrepancy was again measured (L1), and the difference between L1 and L0 indicated the cervical adaptation. Results: Significant influence of the finish line, cement type, and internal relief was observed on the cervical adaptation (P < .001). The CH type of cervical finish line resulted in the best cervical adaptation of the metal crowns regardless of the cement type either with or without internal relief (36.6 +/- 3 to 100.8 +/- 4 mu m) (3-way analysis of variance and Tukey's test, alpha = .05). The use of glass-ionomer cement resulted in the least cervical discrepancy (36.6 +/- 3 to 115 +/- 4 mu m) than those of other cements (45.2 +/- 4 to 130.3 +/- 2 mu m) in all conditions. Conclusion: the best cervical adaptation was achieved with the chamfer type of finish line. The internal relief improved the marginal adaptation significantly, and the glass-ionomer cement led to the best cervical adaptation, followed by zinc phosphate and resin cement.
dc.languageeng
dc.publisherQuintessence Publishing Co Inc
dc.relationQuintessence International
dc.relation1.088
dc.relation0,563
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.subjectcementation
dc.subjectfinish line
dc.subjectglass-ionomer cement
dc.subjectmarginal adaption
dc.subjectPanavia
dc.subjectprosthodontics
dc.subjectresin cement
dc.subjectzinc phosphate cement
dc.titleThe influence of cervical finish line, internal relief, and cement type on the cervical adaptation of metal crowns
dc.typeArtigo


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