Comparative assessment of marginal accuracy of grade II titanium and Ni-Cr alloy before and after ceramic firing: An in vitro study

Patil, Abhijit; Singh, K. P.; Sahoo, Sukant; Suvarna, Suraj; Kumar, Prince; Singh, Anupam

doi:10.4103/1305-7456.115409

Cited by 9 publications

(12 citation statements)

References 10 publications

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“…An ivorine right maxillary incisor was prepared for a full coverage all-ceramic restoration with a heavy chamfer margin. Four points were engraved at a distance of 1 mm below the facial, lingual, mesial, and distal margins[ 12 ] [ Figure 1 ].…”

Section: Methodsmentioning

confidence: 99%

Color stability and marginal integrity of interim crowns: An in vitro study

et al. 2017

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Objective:Many commercial dental materials are used to fabricate interim restorations. This study aimed to compare the color stability and the marginal integrity of four different interim crown materials.Materials and Methods:An ivorine right maxillary central incisor was prepared for a full coverage all-ceramic restoration. A total of 36 specimens in the form of crowns were fabricated on the master die using four different materials (n = 9); Polymethyl methacrylate (PMMA) resin (TrimPLUS), PMMA computer-aided design, and computer-aided manufacturing (CAD-CAM) blocks (Ceramill TEMP), cold cure bis-acryl resin (Success CD), and bis-acryl resin dual-cure composite (TempSpan). Color change ΔE for each sample was calculated by measuring its color as Commission Internationale de l’Eclairage L* a* b* with a spectrophotometer before and after immersing in a concentrated tea solution for 7 days. Marginal gap was measured at four reference points using stereomicroscope at ×40. One-way ANOVA and the Tukey multiple comparisons test were used to determine any statistically significant difference between the four groups, (α = 0.05).Results:Success CD showed significantly the greatest color change (7.7) among all the tested materials, while no significant difference was found between the other three materials. TempSpan showed significantly the highest marginal gap formation (430.15 μm), while no significant difference was found between the three other materials.Conclusions:Bis-acryl resin composite materials demonstrated clinically noticeable change in color while PMMA materials demonstrated superior color stability. Dual cure interim materials exhibited significantly higher marginal discrepancy in comparison to PMMA and cold cure bis-acrylic resin materials. CAD-CAM PMMA material exhibited the best color stability and marginal integrity.

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Section: Methodsmentioning

confidence: 99%

Color stability and marginal integrity of interim crowns: An in vitro study

et al. 2017

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“…The controversial results could be explained by the effects of different factors on the accuracy and adaptation of computer-or hand-made models. Several studies confirm that different prostheses length, 41 materials, 31,42 finishing line configuration, 26,43 and even framework design, 44 and measurement method 31 could affect the accuracy obtained by different fabrication methods.…”

Section: Discussionmentioning

confidence: 98%

Marginal Discrepancy of Single Implant-Supported Metal Copings Fabricated by Various CAD/CAM and Conventional Techniques Using Different Materials

2019

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Objective Framework patterns can be formed using various materials such as wax, acrylic resin, or composite. Frameworks can be fabricated using either conventional or computerized techniques, using additive or subtractive method. This study aimed to compare the marginal adaptation of metal copings fabricated by two computerized technologies (milling and rapid prototyping) and additive conventional methods using different materials. Materials and Methods Seventy-two fixture analogs were mounted vertically in acrylic resin. One-piece abutments with 5.5 mm in length and 6 degrees of convergence were secured into the analogs. The experimental frameworks were fabricated using either subtractive CAD/CAM milling (by wax, soft or hard metal), additive rapid prototyping (by wax), or conventional pattern fabrication (by wax [control] or acrylic resin). Wax and acrylic resin patterns were casted in Ni-Cr alloy. Marginal discrepancy was measured in 12 points by video measuring machine. Statistical Analysis One-way ANOVA and posthoc tests were used to detect any significant difference among the groups at α= 0.05. Results There was a statistically significant difference among the marginal discrepancy of six groups (p = 0.018). The Tukey test indicated a significant difference between CAD/milling of soft metal and conventional wax pattern groups (p = 0.011); a significant difference was also reported between CAD/milling of wax patterns and control group (p = 0.046). Conclusions Frameworks fabricated by conventional wax-up showed the largest marginal gaps, while the marginal gap created by frameworks made of soft metal CAD/milling were the smallest. In addition, frameworks fabricated by rapid prototyping showed clinically acceptable adaptations.

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“…In the literature, previous study (42,43) were in agreement in two areas, first of all the distortion occurs during the thermal cycling process and second one the timing of the deformation mostly occurs during the oxidation of the alloy. Patil et al (44) observed that small changes continue during the porcelain application process. The results of the presented study show that the ceramic firing cycles changed the marginal gap of the three and four-unit FPD's manufactured by LW, MM and DMLS's techniques .The gap values were decreased after PFP for LW and MM, slight increase were seen in DMLS's group.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Gap Changes After Porcelain Firing Cycles of Three and Four Unit of CAD/CAM Milling, Laser Sintering and Cast Metal Ceramic Restorations

Keleş¹,

Turker

2019

Clinical and Experimental Health Sciences

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Objectives: Marginal adaptation changes during the veneering process is an important factor in the clinical success of metal framework techniques such as conventional cast metal cores (LW), CAD-CAM Metal Milling (MM) and Direct Metal Laser Sintering (DMLS). The aim of this study is to evaluate the marginal fit changes between three-and four-unit's metal ceramic fixed partial dentures (FPD's) fabricated by Lost Wax (LW), CAM Metal Milling (MM) and (Direct Metal Laser Sintering) DMLS metal framework techniques after porcelain firing cycles (PFC). Methods: A total of 60 stainless steel three and four unit FPD's models were fabricated. Specimens were randomly divided into three groups to fabricate metal ceramic FPD's frameworks with LW, MM and DMLS techniques. Before and after PFC, cross-sections from silicone replicas were obtained, sectioned, examined and measured with a light microscope. The statistical analysis was done with Mann-Whitney U and Kruskal Wallis and Wilcoxon Signed Ranks tests. Results were evaluated at 95 % of confidence interval and p<0.05 level. Results: There was a statistically significant difference between the three and four unit of FPD's, before PFC for LW and MM (p:0.000) and DMLS (p:0.019)'s groups and only DMLS (p:0.006)'s group was statistically significant after PFC. The mean marginal gaps of LW technique was higher than the MM and DMLS's techniques before PFC. After PFC, DMLS's technique results were higher than LW and MM technique but, no statistically significant difference was found between the marginal gap values of the three and neither for four units of DMLS's FPD's. Conclusion: PFC decreases the mean marginal gap of the LW and MM group, but, there was a slight increase for DMLS group. However, all the marginal gap values obtained were in clinical acceptance level for three and four-units FPD's for all tested specimens.

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Comparative assessment of marginal accuracy of grade II titanium and Ni-Cr alloy before and after ceramic firing: An in vitro study

Cited by 9 publications

References 10 publications

Color stability and marginal integrity of interim crowns: An in vitro study

Color stability and marginal integrity of interim crowns: An in vitro study

Marginal Discrepancy of Single Implant-Supported Metal Copings Fabricated by Various CAD/CAM and Conventional Techniques Using Different Materials

In Vitro Gap Changes After Porcelain Firing Cycles of Three and Four Unit of CAD/CAM Milling, Laser Sintering and Cast Metal Ceramic Restorations

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