Marginal and internal fit of CAD-CAM composite resin and ceramic crowns before and after internal adjustment

Tabata, Lucas Fernando; Silva, Taiana A. de Lima; Silveira, Alessandra C. de Paula; Ribeiro, Ana Paula D.

doi:10.1016/j.prosdent.2019.01.010

Cited by 20 publications

(24 citation statements)

References 26 publications

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“…The involvement of multiple observers allows controlling this error in the statistical model. The whole coefficient of variation in AMD measurement was between 22 and 26% in our study, which was similar to the CV in recent microCT studies [52,[57][58][59]61]. In conclusion, these results highlight the importance of involving multiple observers in the analyses and indicate the high accuracy of the microCT method.…”

Section: Discussionsupporting

confidence: 90%

“…Manual adjustment or discarding of restorations after visual inspection could greatly decrease the marginal gap and AMD [57], but this technique was not applied in this study contrary to other studies [4,8,55,57,62,63].…”

Section: Discussionmentioning

confidence: 84%

“…The microCT with high resolution increases the contrast of the margin line of the specimens, which could improve the measurement. In this study, an extremely high resolution (8.7 μm) was used, higher than previous studies with 10-19 μm resolution [52,[57][58][59]. The high resolution could contribute to the significant findings in our study despite the low sample number.…”

Section: Discussionmentioning

confidence: 90%

“…The results of microCT studies are very similar to those presented here. The mean AMD was 151-161 μm with the Omnicam and CEREC inLab milling unit [57] and 145-412 μm after conventional impression [52]. The microCT with high resolution increases the contrast of the margin line of the specimens, which could improve the measurement.…”

Section: Discussionmentioning

confidence: 97%

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Marginal and internal fit of full ceramic crowns milled using CADCAM systems on cadaver full arch scans

et al. 2020

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Background: Chairside systems are becoming more popular for fabricating full-ceramic single restorations, but there is very little knowledge about the effect of the entire workflow process on restoration fit. Therefore, this study aimed to compare the absolute marginal discrepancy (AMD) and the full internal fit (FULL) of all-ceramic crowns made by two chairside systems, Planmeca FIT and CEREC, with detailed and standard mill settings. Methods: One upper molar was prepared for an all-ceramic crown in human cadaver maxilla. Full-arch scans were made by Emerald or Omnicam four times each. Twenty-four e.max crowns were designed and milled by the Planmill 30s or 40s or CEREC MCXL mills with either detailed or standard settings. The cadaver tooth was extracted, and each crown was fixed on it and scanned by a high-resolution microCT scanner. The AMD and FULL were measured digitally in mesio-distal and bucco-lingual 2D slices. The actual and predicted times of the milling were also registered. Results: No differences were observed between detailed or standard settings in either system. The AMD was significantly higher with CEREC (132 ± 12 μm) than with either Planmill 30s (71 ± 6.9 μm) or 40s (78 ± 7.7 μm). In standard mode, the FULL was significantly higher with CEREC (224 ± 9.6 μm) than with either Planmill 30s (169 ± 8.1 μm) or 40s (178 ± 8.5 μm). There was no difference between actual and predicted time with the two Planmeca models, but with CEREC, the actual time was significantly higher than the predicted time. The 30s had significantly higher actual and predicted times compared to all other models. Across all models, the average milling time was 7.2 min less in standard mode than in detailed mode. Conclusions: All fit parameters were in an acceptable range. No differences in fit between Planmeca models suggest no effect of spindle number on accuracy. The detailed setting has no improvement in the marginal or internal fit of the restoration, yet it increases milling time.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 97%

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Marginal and internal fit of full ceramic crowns milled using CADCAM systems on cadaver full arch scans

et al. 2020

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“…Errors arising from such processes are likely to cause an increase in the internal gap. Clinician interventions during the clinical adaptation process can also influence internal and marginal adaptation [50].…”

Section: Discussionmentioning

confidence: 99%

Adaptability Evaluation of Metal-Ceramic Crowns Obtained by Additive and Subtractive Technologies

2020

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(1) Background: Traditional metal-ceramic restorations are considered as a standard in the evaluation of new technologies. A critical factor in their longevity is represented by their adaptability; The purpose of this study was to evaluate the marginal and internal gap of ceramic-fused to metal crowns with frameworks obtained by additive manufacturing (AM) technologies and the influence of veneering process on their fit; (2) Methods: Metal-ceramic crowns have been produced by conventional lost-wax technology (T), digital milling (F), selective laser sintering (SLS) and selective laser melting (SLM). The adaptability was assessed using silicone replicas before and after ceramic veneering; (3) Results: The best values were obtained for the milled group followed closely by SLM and SLS, and a significantly higher gap for casted copings. The veneering process did not significantly influence the adaptability of the crowns, regardless of the manufacturing process used for frameworks. The present study promotes additive technologies (AT) as a fast, efficient, and cost-effective alternative to traditional technology. There are fewer steps in which errors can occur when digital technologies are used and the risk of distortion is diminished. (4) Conclusions: CAD/CAM technologies, both additive and subtractive, represent an excellent option to produce time-effective, precise metal-ceramic crowns with excellent adaptation.

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Current Protocols for Resin-Bonded Dental Ceramics

Blatz

Conejo

Alammar³

et al. 2022

Dental Clinics of North America

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Marginal and internal fit of CAD-CAM composite resin and ceramic crowns before and after internal adjustment

Cited by 20 publications

References 26 publications

Marginal and internal fit of full ceramic crowns milled using CADCAM systems on cadaver full arch scans

Marginal and internal fit of full ceramic crowns milled using CADCAM systems on cadaver full arch scans

Adaptability Evaluation of Metal-Ceramic Crowns Obtained by Additive and Subtractive Technologies

Current Protocols for Resin-Bonded Dental Ceramics

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