scholarly journals Effect of Finish Line on Marginal Fit of Sintered Gold Copings

2013 ◽  
Vol 24 (4) ◽  
pp. 322-325
Author(s):  
Fernanda Pelogia Gwinner ◽  
Marco Antonio Bottino ◽  
Lafayete Nogueira-Junior ◽  
Alvaro Della Bona
Keyword(s):  
Marginal Gap ◽  
Finish Line ◽  
Marginal Fit ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Master Model ◽  
Tooth Preparation ◽  
Student’S T ◽  
Equidistant Points ◽  
Student’S T Test

The aim of this study was to evaluate the vertical marginal gap of sintered gold copings and metal-ceramic crowns with different finish line preparations: a beveled round shoulder (BRS) and a beveled long chamfer (BLC), testing the null hypotheses that there are no differences in marginal gap regardless of finish line and phase of restoration (coping or crown). Stainless steel master models were fabricated to simulate tooth preparation for metal-ceramic crowns with different finish lines (BRS and BLC). Ten dies were obtained from each model. Preparations were coated with 2 layers of spacer to 1 mm from the margin. Sintercast gold copings were prepared, sintered and adjusted to the dies. The copings (n=10) were placed onto the master model and the marginal gap was measured in 24 equidistant points using optical microscopy (X230). An opaque and two body ceramic layers were subsequently applied to the copings and the same measuring procedure was performed for the crowns. The data were analyzed statistically using paired and unpaired Student's t-test (α=0.05). Mean marginal gap values (µm) for the copings and crowns were, respectively: 113.6 and 117.1 for the BRS; and 58.2 and 74.3 for the BLC preparation. Significantly greater marginal gaps (p=0.0307) were found for restorations with BRS than with BLC finish line, which also showed statistically significant differences in the gap size between coping and crown (p=0.001). In conclusion, marginal gap is influenced by ceramic application on copings fabricated on BLC preparation, and greater marginal gaps were found for restorations with BRS finish line, rejecting the experimental null hypotheses.

scholarly journals Marginal and internal fit and intaglio surface trueness of interim crowns fabricated from tooth preparation of four finish line locations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Keunbada Son ◽  
Young-Tak Son ◽  
Ji-Min Lee ◽  
Kyu-Bok Lee
Keyword(s):  
Three Dimensional ◽  
Clinical Situation ◽  
Intraoral Scanner ◽  
Replica Technique ◽  
Finish Line ◽  
Marginal Fit ◽  
Tooth Preparation ◽  
The Right ◽  
Internal Fit ◽  
Marginal Region

AbstractThis study evaluated the marginal and internal fit and intaglio surface trueness of interim crowns fabricated from tooth preparation scanned at four finish line locations. The right maxillary first molar tooth preparation model was fabricated using a ceramic material and placed in four finish line locations (supragingival, equigingival, subgingival, and subgingival with a cord). Intraoral scanning was performed. Crowns were designed based on the scanned area. Interim crowns were fabricated using a stereolithography three-dimensional (3D) printer (N = 16 per location). Marginal and internal fit were evaluated with a silicone replica technique. Intaglio surface trueness was evaluated using a 3D inspection software. One-way analysis of variance and Tukey HSD test were performed for comparisons (α = 0.05). The marginal and internal fit showed significant differences according to locations (P < 0.05); the marginal fit showed the best results in the supragingival finish line (P < 0.05). Intaglio surface trueness was significantly different in the marginal region, with the highest value in the subgingival location (P < 0.05). Crowns fabricated on the subgingival finish line caused inaccurate marginal fit due to poor fabrication reproducibility of the marginal region. The use of an intraoral scanner should be decided on the clinical situation and needs.

Fit of metal ceramic crowns cast in Au-1.6wt% Ti alloy for different abutment finish line curvature

2006 ◽  
Vol 22 (5) ◽  
pp. 397-404 ◽  
Author(s):  
Jianxiang Tao ◽  
Masanobu Yoda ◽  
Kohei Kimura ◽  
Osamu Okuno
Keyword(s):  
Ti Alloy ◽  
Finish Line ◽  
Metal Ceramic ◽  
Ceramic Crowns

The Marginal Fit of CAD/CAM Monolithic Ceramic and Metal-Ceramic Crowns

2017 ◽  
Vol 28 (3) ◽  
pp. 299-304 ◽  
Author(s):  
Yolanda Freire ◽  
Esther Gonzalo ◽  
Carlos Lopez-Suarez ◽  
Maria J. Suarez
Keyword(s):  
Marginal Fit ◽  
Metal Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns

The Marginal Fit of CAD-CAM Zirconia Cores with Different Proximal Margin Configurations

2007 ◽  
Vol 330-332 ◽  
pp. 1409-1412
Author(s):  
O.E. Puntsag ◽  
E.K. Bae ◽  
Jae Hoon Lee ◽  
Keun Woo Lee
Keyword(s):  
Statistical Difference ◽  
Marginal Gap ◽  
Proximal Margin ◽  
Marginal Fit ◽  
Group I ◽  
Metal Ceramic ◽  
Cad Cam ◽  
The Mean ◽  
Tooth Axis

This study evaluated the marginal fit of CAD-CAM Zirconia cores with different proximal height. Thirty Zirconia cores and ten metal ceramics crowns were used to evaluate the marginal gap. The marginal fit was determined to be perpendicular to the tooth axis between the most apical point on the coping margin (core) and the reference marks on the mesial, distal, labial, and palatal surfaces of the die at several key stages of crown fabrication; before porcelain built-up, after body porcelain built-up, and after glazing. Additionally, an opaque stage for the metal ceramic copings was compared as well. Each measurement was carried out with a microscope. The means of gaps among the groups were 58±27 -m, 69±23 -m, 89±29 -m and 80±28 -m, groups I, II, III and IV, respectively. In relation to the proximal and labiopalatal surfaces there were no statistical difference among the groups, except group I. No significant differences were observed in firing stages of all groups. The findings of this study showed that the mean marginal gap of Zirconia cores with different proximal heights fell well within the acceptable clinical ranges.

Effect of Incompatibility Stress on the Fit of Metal-Ceramic Crowns

1987 ◽  
Vol 66 (8) ◽  
pp. 1341-1345 ◽  
Author(s):  
K.J. Anusavice ◽  
J.E. Carroll
Keyword(s):  
Finite Element ◽  
Interactive Effect ◽  
Thermal Contraction ◽  
Finite Element Analyses ◽  
Marginal Gap ◽  
Positive Contraction ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Poor Creep Resistance ◽  
Abrasive Blasting

The interactive effect of coping thickness and a positive thermal contraction mismatch between metal and porcelain on the fit of metal-ceramic crowns has not yet been experimentally determined. Previous studies have suggested that marginal distortion may be due to contraction differences, although finite element analyses indicate that these distortion effects should be negligible. The marginal gap between metal-ceramic crowns and prepared dies was determined under conditions designed to exaggerate distortion effects. These included the use of thin metal copings (0.1 and 0.2 mm), a chamfer preparation, an alloy with relatively poor creep resistance, and a large thermal contraction mismatch between the alloy and porcelain layers. Gap changes which resulted during porcelain firing cycles were relatively small, but larger marginal discrepancies developed in crowns prepared with a compatible porcelain during grinding and abrasive blasting procedures. This study conclusively demonstrates that incompatibility stress induced by a positive contraction mismatch is not a primary cause of marginal or generalized distortion of metal-ceramic crowns and suggests that external grinding and internal abrasive blasting of crowns are more likely causes of this effect.

Influence of finish line design on marginal adaptation of electroformed metal-ceramic crowns

2006 ◽  
Vol 95 (3) ◽  
pp. 237-242 ◽  
Author(s):  
Hisaka Shiratsuchi ◽  
Futoshi Komine ◽  
Yoshiyuki Kakehashi ◽  
Hideo Matsumura
Keyword(s):  
Marginal Adaptation ◽  
Finish Line ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Line Design

Consistency of Labial Finish Line Preparation for Metal Ceramic Crowns: An Investigation of a New Bur

2007 ◽  
Vol 0 (0) ◽  
pp. 071117012507002-???
Author(s):  
Kevin G. Seymour ◽  
George P. Cherukara ◽  
Dayananda Y.D. Samarawickrama ◽  
Lifong Zou
Keyword(s):  
Finish Line ◽  
Metal Ceramic ◽  
Ceramic Crowns

Marginal Fit of Metal-Ceramic Copings: Effect of Luting Cements and Tooth Preparation Design

2017 ◽  
Vol 28 (1) ◽  
pp. e265-e270 ◽  
Author(s):  
Juliana Gomes dos Santos Paes de Almeida ◽  
Carlos Gramani Guedes ◽  
Filipe de Oliveira Abi-Rached ◽  
Flávia Zardo Trindade ◽  
Renata Garcia Fonseca
Keyword(s):  
Marginal Fit ◽  
Luting Cements ◽  
Metal Ceramic ◽  
Tooth Preparation ◽  
Preparation Design

scholarly journals Effect of manufacturing protocol on the internal fit and marginal discrepancy of metal ceramic and full ceramic dental crowns

2018 ◽  
Vol 63 (01) ◽  
pp. 69-74
Author(s):  
Katerina V. Geshoska ◽  
Jagoda Bajevska
Keyword(s):  
Manufacturing Process ◽  
Two Phase ◽  
Marginal Fit ◽  
Manufacturing Method ◽  
Dental Crowns ◽  
Metal Ceramic ◽  
Marginal Discrepancy ◽  
Ceramic Crowns ◽  
Internal Fit

The accuracy of internal fit and marginal precision plays important role of clinical quality and success of dental crowns. Complications caused by marginal discrepancies such as caries, gingivitis, hypersensitivity are highlighted in dental literature. Despite marginal fit, internal fit and precision have a significant role in the persistence of full ceramic and metal ceramic crowns. As the technology evolves, it’s questionable which impression and manufacturing method is giving most accurate dental crowns. Therefore, the main purpose of this study is to get some information and data about marginal and internal fitting of dental crowns made by conventional, two-phase impression technique with polyvinyl siloxanes, and using different manufacturing process. Keywords: internal fit, marginal discrepancy, metal ceramic, full ceramic crowns

Sign in / Sign up

Export Citation Format

Share Document