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

scholarly journals Fit of metal-ceramic crowns

2021 ◽  
Vol 21 ◽  
pp. e225136
Author(s):  
Patrícia Valéria Manozzo Kunz ◽  
Gabriela Andrade Serpa ◽  
Leonardo Fernandes da Cunha ◽  
Gisele Maria Correr ◽  
Carla Castiglia Gonzaga
Keyword(s):  
Cobalt Chromium ◽  
Manufacturing Method ◽  
Significant Difference ◽  
Metal Ceramic ◽  
Before And After ◽  
Cad Cam ◽  
Marginal Discrepancy ◽  
Ceramic Crowns ◽  
Student’S T ◽  
Internal Fit

Aim: To evaluate the influence of cobalt-chromium (Co-Cr) coping fabrication methods and ceramic application on the marginal and internal fit of metal-ceramic crowns. Methods: Co-Cr copings for metal-ceramic crowns were prepared by lost wax casting or CAD-CAM machining of sintered blocks. The fit was analyzed using the silicone replica technique at four assessment points: marginal gap (MG), axial wall (AW), axio-occlusal (AO) angle, and central occlusal (CO) wall. After the initial analysis, the copings were ceramic-veneered with the layering technique, and the fit was again determined. Data were statistically analyzed by paired and unpaired Student’s-t test (α=0.05). Results: Marginal and internal fit before ceramic application according to the coping manufacturing method showed significant differences only at CO (p < 0.001), with milled copings (137.98±16.71 μm) showing higher gap values than cast copings (112.86±8.57 μm). For cast copings, there were significant differences at MG (before 109.13±8.79 μm; after 102.78±7.18 μm) and CO (before 112.86±8.57 μm; after 104.07±10.63 μm) when comparing the fit before and after ceramic firing. For milled copings, there was significant difference only at AO (before 116.39±9.64 μm; after 108.54±9.26 μm). Conclusion: This study demonstrated that the coping fabrication method influenced the internal fit. Ceramic firing maintained or improved the fit of the metal-ceramic crowns. The marginal discrepancy of all restorations, before and after ceramic firing, can be considered clinically acceptable.

Analysis of Internal and Marginal fit of Metal-ceramic Crowns During Processing, Using Conventional and Digitized Technologies

2018 ◽  
Vol 69 (7) ◽  
pp. 1699-1701
Author(s):  
Cristina Elena Savencu ◽  
Sorin Porojan ◽  
Liliana Porojan
Keyword(s):  
Clinical Success ◽  
Replica Technique ◽  
Digital Light Processing ◽  
Marginal Fit ◽  
Dental Restorations ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Pattern Group

Copings accuracy is an important factor for long-term clinical success of ceramic fused to metal dental restorations. The purpose of the study was to investigate marginal and internal fit of metal-ceramic crowns during processing, using conventional and digitized technologies. Metal copings were produced by Digital light Processing (DLP), invested and casted. Ceramic veneers were overpressed. Internal and marginal fit was measured using silicon replica technique for patterns, casted frameworks and final ceramic fused to metal crowns. Best adaptation was found in resin-pattern group, with small increasing of gap after casting and after ceramic pressing.

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

scholarly journals Evaluation of marginal adaptation of CAD/CAM vs conventional all-ceramic crowns on an implant abutment: An in vitro study

2021 ◽  
Vol 7 (2) ◽  
pp. 104-109
Author(s):  
Himanshu Aeran ◽  
Megha Sagar ◽  
Jyotsna Seth
Keyword(s):  
Marginal Adaptation ◽  
Marginal Fit ◽  
Group I ◽  
All Ceramic ◽  
Cad Cam ◽  
Marginal Discrepancy ◽  
Laboratory Procedures ◽  
Ceramic Crowns ◽  
The Mean ◽  
Vertical Gap

The survival of fixed prosthodontic restorations depends on the state of the marginal adaptation. Marginal gaps can create a favourable condition for biofilm deposition, thereby contributing to the development of caries and periodontal disease. The longevity of fixed prosthodontic restorations depends on the condition of the marginal adaptation to the abutment teeth. The presented work aimed to study, evaluate and compare the marginal adaptation of All-Ceramic crowns fabricated using conventional laboratory procedures with those fabricated using the CAD/CAM technology.To compare the marginal fit and adaptation of All- Ceramic crowns obtained by conventional techniques and crowns obtained by CAD/CAM technique. The presented study focused on a total of 20 samples divided into two groups viz. Group I (Conventional) and Group II (CAD/CAM) having 10 sample each. The samples were prepared with the straight abutment having a standardized collar height of 2mm, HIOSSEN that was mounted on acrylic blocks using implant analogue, HIOSSEN. A set of crowns was produced by 5-axis milling lithium disilicate using glass-ceramic blocks with laboratory fabrication methods. Another set of zirconia crowns was produced using CAD/CAM technology. Circumferential marginal gap measurements were taken at 12 measurement locations on the hexagonal die marked equidistant to each other. Both the samples were measured for marginal discrepancy at under the stereomicroscope.The results obtained showed that the mean vertical gap for the group II samples showed the least variation in the marginal discrepancy. Although the mean obtained for both the groups showed that the mean vertical marginal discrepancy was within the clinically acceptable level.It can be concluded that within the limitation of the study the data obtained showed that The Mean vertical gap was the maximum for Group I (Conventional group) i.e. 49.25 µm showing maximum variation in marginal fit. While the CAD/CAM Group had shown least vertical marginal discrepancy which depicts statistically significant better marginal fit than those fabricated using conventional laboratory procedures.

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 of Ceramic Restorations Fabricated Using Digital Scanning and Conventional Impressions: A Clinical Study

2020 ◽  
Vol 9 (12) ◽  
pp. 4035
Author(s):  
Jeong-Hyeon Lee ◽  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
Clinical Study ◽  
Conventional Method ◽  
Goodness Of Fit ◽  
Satisfaction Score ◽  
Scanning Method ◽  
Marginal Fit ◽  
Significant Difference ◽  
Clinician Satisfaction ◽  
Ceramic Crowns ◽  
Internal Fit

This clinical study was designed with the aim of fabricating four ceramic crowns using the conventional method and digital methods with three different intraoral scanners and evaluate the marginal and internal fit as well as clinician satisfaction. We enrolled 20 subjects who required ceramic crowns in the upper or lower molar or the premolar. Impressions were obtained using digital scans, with conventional impressions (polyvinyl siloxane and desktop scanner) and three different intraoral scanners (EZIS PO, i500, and CS3600). Four lithium disilicate glass-ceramic crowns were fabricated for each patient. In the oral cavity, the proximal and occlusal adjustments were performed, and the marginal fit and internal fit were evaluated using the silicone replica technique. The clinician satisfaction score of the four crowns was evaluated as per the evaluations of the proximal and occlusal contacts made during the adjustment process and the marginal and internal fit. For statistical analysis, the differences among the groups were analyzed with one-way analysis of variance and Tukey HSD test as a post-test; Pearson correlation analysis was used for analyzing the correlations (α = 0.05). There was a significant difference in the marginal and internal fit of the ceramic crowns fabricated using three intraoral scanner types and one desktop scanner type (p < 0.001); there was a significant difference in the clinician satisfaction scores (p = 0.04). The clinician satisfaction score and marginal fit were significantly correlated (absolute marginal discrepancy and marginal gap) (p < 0.05). An impression technique should be considered for fabricating a ceramic crown with excellent goodness-of-fit. Further, higher clinician satisfaction could be obtained by reproducing the excellent goodness-of-fit using the intraoral scanning method as compared to the conventional method.

scholarly journals Internal fit of two all-ceramic systems and metal-ceramic crowns

2012 ◽  
Vol 20 (2) ◽  
pp. 235-240 ◽  
Author(s):  
Leandro Moura Martins ◽  
Fabio Cesar Lorenzoni ◽  
Alcides Oliveira de Melo ◽  
Luciana Mendonça da Silva ◽  
José Luiz G. de Oliveira ◽  
...  
Keyword(s):  
All Ceramic ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Internal Fit
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