Effect of production method on surface roughness, marginal and internal fit, and retention of cobalt-chromium single crowns

Lövgren, Niklas; Roxner, Rikard; Klemendz, Susanne; Larsson, Christel

doi:10.1016/j.prosdent.2016.09.025

Cited by 51 publications

(40 citation statements)

References 23 publications

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“…50 This nondestructive technique is considered a reliable and reproducible methodology. 51 However, tearing of the elastomeric film, presence of flaws, and errors in sectioning planes during the preparation of the samples are errors frequently described for this technique. 22,50 A limitation of this study was that discrepancies were evaluated before ceramic veneering.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Marginal and Internal Fit of Presintered Co‐Cr and Zirconia Three‐Unit Fixed Dental Prosthesis Compared to Cast Co‐Cr

Daou

Baba

2020

Journal of Prosthodontics

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Purpose: The precision of soft metal processing technologies is poorly documented. This study compared marginal and internal fit of presintered cobalt-chromium (Co-Cr) and zirconia three-unit fixed dental prostheses (FDPs) to cast Co-Cr. Materials and Methods: Three-unit FDPs were prepared on metal dies (N = 60) from typodont preparations of the maxillary right first premolar and molar. A standardized preparation of a metal-ceramic restoration was done on abutment teeth. The dies (N = 60) were scanned and divided into three groups (n = 20/group) to receive the FDP made of presintered Co-Cr (Ceramill Si), presintered zirconia (Ceramill Zi), and cast Co-Cr (Girobond NB). Each framework was seated on its specific cast. A replica technique was used for marginal and internal discrepancies measurements in mesiodistal and buccolingual planes. Data were analyzed using the Levene test, t-test, and analysis of variance (α = 0.05). Results: When the overall mean discrepancy values were compared in the mesiodistal plane, a significant difference was found between Ceramill Sintron and Ceramill Zi groups (p = 0.026). No significant difference was detected between Girobond NB and Ceramill Sintron groups and between Girobond NB and Ceramill Zi groups (p = 0.537 and p = 0.569, respectively). In the buccolingual plane, there was no significant difference in the overall mean discrepancy between the three groups: CS/CZ (p = 1.000), GI/CS (p = 0.51), and GI/CZ (p = 0.87). Significant differences at several measurement points were found at the inter or intramaterial level. The increase in discrepancy values between marginal and occlusal measurements was evident for the three groups. Conclusions: Presintered three-unit FDPs fabricated from zirconia and Co-Cr exhibited internal and marginal discrepancy values similar to cast Co-Cr. A significant difference was reported between CS and CZ in mesiodistal planes. The axial and marginal differences in values for the three tested groups were below or around the 120 µm clinically acceptable threshold except for the occlusal area. When comparing first premolar to first molar, the internal and marginal discrepancies were similar with no apparent distortion of the framework after the sintering process.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Marginal and Internal Fit of Presintered Co‐Cr and Zirconia Three‐Unit Fixed Dental Prosthesis Compared to Cast Co‐Cr

Daou

Baba

2020

Journal of Prosthodontics

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“…Currently, there is no general consensus regarding an acceptable tolerance limit. As a result, a general consensus has not been found in the bibliographical surveys, which has revealed a high level of discrepancy in the range of 35 to 120 µm [44,45,49]. In the same way, with regards to accuracy, there is neither a specific limit value nor a general consensus amongst researchers in this area.…”

Section: Introductionmentioning

confidence: 94%

Mechanical Properties of CoCr Dental-Prosthesis Restorations Made by Three Manufacturing Processes. Influence of the Microstructure and Topography

Padrós¹,

Punset

Molmeneu

et al. 2020

Metals

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The aim of this study is to compare the mechanical properties of three different dental restorations’ manufacturing processes (CADCAM milling, casting and laser sintering) generated by only one laboratory scanner focusing on marginal fit analysis and their mechanical properties. A chrome-cobalt (Cr-Co) alloy from the same batch was used for three different methods to make an implant abutment. This simulates a maxillary right first molar that was fixed in a hemi-maxillary stone model. Five scans were performed by each tested framework. Nine frameworks were manufactured for each manufacture procedure. Field-Emission Scanning Electron Microscope (FE-SEM) direct vision was used to marginal gap measurement in five critical points for each specimen. In order to fix the samples in the microscope chamber, the restorations were submitted at a compression load of 50 N. The samples always have the same orientation and conditions. The resolution of the microscope is 4 nm and it is equipped by J image software. The microstructure of the samples was also determined with the FE-SEM equipped with EDS-microanalysis. Roughness parameters were measured using White Light Interferometry (WLI). The arithmetical mean for the Ra and Rq of each sample was calculated. The samples were mechanically characterized by means of microhardness and flexural testing. Servo-hydraulic testing machine was used with cross-head rate of 1 mm/min. Two-way ANOVA statistical analysis was performed to determine whether the marginal discrepancies and mechanical properties were significantly different between each group (significance level p < 0.05). The overall mean marginal gap values were: from 50.53 ± 10.30 µm for the samples produced by CADCAM to 85.76 ± 22.56 µm for the samples produced by the casting method. Laser sintering presents a marginal gap of 60.95 ± 20.66 µm. The results revealed a statistically significant difference (p-value < 0.005) in the mean marginal gap between the CADCAM systems studied. The higher flexure load to fracture for these restorations were for CADCAM restoration and the lower was for the casting samples. For these restorations, CADCAM Restoration yielded a higher flexure load to fracture and Casting ones yielded the lower. Porosity and microstructure play a very important role in the mechanical properties.

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“…Figure 2 shows the results of the quality assessment using QUADAS-2. Of the 21 articles, 10 exhibited a low risk of bias [21,24,[28][29][30]32,34,[36][37][38], and 11 articles showed some level of unclear risk of bias [22,23,[25][26][27]31,33,35,[39][40][41]. All the included studies had a clearly stated purpose and included a control group for the evaluation of the marginal fit.…”

Section: Characteristics Of the Included Studiesmentioning

confidence: 99%

Reliability of Metal 3D Printing with Respect to the Marginal Fit of Fixed Dental Prostheses: A Systematic Review and Meta-Analysis

et al. 2020

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Three-dimensional (3D) printing technologies have been widely used to manufacture crowns and frameworks for fixed dental prostheses. This systematic review and meta-analysis aimed to assess the reliability of the marginal fit of 3D-printed cobalt-chromium-based fixed dental prostheses in comparison to conventional casting methods. Articles published until 25 June 2020, reporting the marginal fit of fixed prostheses fabricated with metal 3D printing, were searched using electronic literature databases. After the screening and quality assessment, 21 eligible peer-reviewed articles were selected. Meta-analysis revealed that the marginal gap of the prostheses manufactured using 3D printing was significantly smaller compared to that manufactured using casting methods (standard mean difference (95% CI): −0.92 (−1.45, −0.38); Z = −3.37; p = 0.0008). The estimated difference between the single and multi-unit types did not differ significantly (p = 0.3573). In the subgroup analysis for the measurement methods, the tendency of marginal discrepancy between the 3D printing and casting groups was significantly different between articles that used direct observation and those that used the silicone replica technique (p < 0.001). Metal 3D printing technologies appear reliable as an alternative to casting methods in terms of the fit of the fixed dental prostheses. In order to analyze the factors influencing manufacturing and confirm the results of this review, further controlled laboratory and clinical studies are required.

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Effect of production method on surface roughness, marginal and internal fit, and retention of cobalt-chromium single crowns

Cited by 51 publications

References 23 publications

Evaluation of Marginal and Internal Fit of Presintered Co‐Cr and Zirconia Three‐Unit Fixed Dental Prosthesis Compared to Cast Co‐Cr

Evaluation of Marginal and Internal Fit of Presintered Co‐Cr and Zirconia Three‐Unit Fixed Dental Prosthesis Compared to Cast Co‐Cr

Mechanical Properties of CoCr Dental-Prosthesis Restorations Made by Three Manufacturing Processes. Influence of the Microstructure and Topography

Reliability of Metal 3D Printing with Respect to the Marginal Fit of Fixed Dental Prostheses: A Systematic Review and Meta-Analysis

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