Micro‐CT Evaluation of Ceramic Inlays: Comparison of the Marginal and Internal Fit of Five and Three Axis CAM Systems with a Heat Press Technique

Alajaji, Norah K.; Bardwell, David N; Finkelman, Matthew; Ali, Ala

doi:10.1111/jerd.12271

Cited by 39 publications

(56 citation statements)

References 35 publications

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“…Planmill 30s has one 3-axis spindle, and the object can rotate, whereas the 40s and MCXL models have two spindles moving simultaneously in 3 axes. Studies show that the number of axes does not necessarily improve the accuracy of the restoration [54,59,81,82], which is confirmed by the results presented here. The Planmill 30s required more time for milling, likely due to its one spindle.…”

Section: Discussionsupporting

confidence: 88%

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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: 88%

“…This means that AMD is higher than or in an ideal condition perhaps equal to the marginal gap. In studies measuring both parameters, the AMD was found to be 30-118% greater than the marginal gap [52][53][54]. Literature regarding marginal fit with chairside systems is available for CEREC, but most of them scanned typodont specimens.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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“…6,7 CAD-CAM systems allow the fabrication of wax patterns by milling solid blanks through direct or indirect scanning of the preparation. 8 When e.max Press partial coverage restorations are considered, [9][10][11][12][13][14][15][16][17] only 1 investigation 16 has compared the adaptation of inlays produced from wax patterns fabricated by conventional waxing or CAD-CAM systems. The authors concluded that the subtractive waxing technique resulted in improved marginal and internal fit accuracy compared with conventional wax pattern fabrication.…”

Section: Introductionmentioning

confidence: 99%

Comparison of fit accuracy of pressed lithium disilicate inlays fabricated from wax or resin patterns with conventional and CAD-CAM technologies

Homsy

Özcan

Khoury³

et al. 2018

The Journal of Prosthetic Dentistry

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STATEMENT OF PROBLEM The use of resin patterns to produce partial coverage restorations is poorly documented. PURPOSE The purpose of this in vitro study was to compare the marginal and internal fit accuracy of lithium disilicate glass-ceramic inlays obtained from wax or resin patterns and fabricated with digital and conventional techniques. MATERIAL AND METHODS A dentoform mandibular first molar was prepared for a mesio-occlusal ceramic inlay. Six groups of 15 inlays were obtained by conventional impression and manual wax (group CICW) or resin patterns (group CICR); conventional impression, laboratory scanning of the stone die, CAD-CAM milled wax (group CIDW), or polymethylmethacrylate (PMMA) blocks (group CIDR); and scanning of the master preparation with an intraoral scanner, CAD-CAM milled wax (group DSDW), or PMMA blocks (DSDR). The same design was applied to produce the wax and PMMA patterns in the last 4 groups. The replica technique was used to measure marginal and internal fit under stereomicroscopy. Mixed-model ANOVA was applied to assess differences according to the techniques, materials, and discrepancy location (=.05). RESULTS The results demonstrated significant effects of the technique (P<.001), material (P=.009), and discrepancy location (P<.001) on fit measurements. Marginal discrepancy was only affected by the technique (P<.001), with the digital approaches yielding the smallest marginal discrepancy (23.5 ±3.6 m), followed by the conventional digital techniques (31.1 ±5.6 m) and finally by the conventional (42.8 ±7.2 m) techniques. Internal fit was significantly influenced only by the material with lower discrepancy in wax (75.2 ±9.0 m) than in resin patterns (84.7 ±15.1 m). The internal discrepancy was significantly larger than the marginal discrepancy in all groups (P<.001). CONCLUSIONS Inlays generated from conventional wax and resin patterns tend to show higher marginal discrepancies than conventional digital and full digital patterns. Wax and resin materials yield similar marginal fit accuracies irrespective of the impression/manufacturing technique. Better internal fit was shown in wax than in resin patterns, regardless of the technique.

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“…The nature of the milling units of the investigated CAD/CAM systems; 5-axis milling machine, has been reported to show superior performance in internal adaptation of milled restorations. 45 The higher the number of milling axes, the better the ability to rotate the milling spindle, thereby leading to greater accuracy. This could be connected to a better finishing in the cervical region of the restoration that has a consequent impact on marginal adaptation.…”

Section: Discussionmentioning

confidence: 99%

Comparison of accuracy of restorations generated through digital images of two extra oral scanners

Salaheldin

Sherif

Mohammed

et al. 2019

Egyptian Dental Journal

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Statement of problem: With the advancement of digital technology, extraoral digital scanners have become popular among dental laboratories and dentists. The literature concerning accuracy of restorations fabricated from digital images of extraoral scanners is non conclusive. Aim: The the aim of the study is to compare the accuracy of single crowns generated from CAD/CAM Systems using digital images of two extra-oral scanners. Materials and Methods: Twenty 3D printed dies were scanned using the investigated extraoral scanners (InEos X5 and Ceramill map 400). The digital images were used to produce a 3D virtual crown design on the systems' respective CAD softwares. Crowns were milled of lithium disilicate blocks. The milled crowns were divided into two groups according to the type of CAD/CAM system used; Group I/M (Cerec system: In Eos X5 and MCX5) and Group C/C (Amanngirbach System: Ceramill map 400 and Ceramill motion2), 10 crowns each. The marginal gap distance between the crown and the 3D printed resin die was measured using a digital microscope and replica technique was used to measure the internal gap between the crowns and their respective 3D printed resin dies. Results: Group I/M demonstrated statistically significant smaller median marginal gap distance 95 μm while Group C/C demonstrated a median marginal gap distance of 113 μm. The was no statistically significant difference between both systems with regards to internal fitness. The accuracy of crowns of both systems was within clinically acceptable range. Conclusions: Crowns generated from CEREC system (In Eos X5/ MCX5) showed better marginal accuracy than AmannGirrbach system. (Ceramill map 400 / Ceramill motion 2). Both systems produced marginal accuracy and internal fitness within the clinically accepted range.

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Micro‐CT Evaluation of Ceramic Inlays: Comparison of the Marginal and Internal Fit of Five and Three Axis CAM Systems with a Heat Press Technique

Cited by 39 publications

References 35 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

Comparison of fit accuracy of pressed lithium disilicate inlays fabricated from wax or resin patterns with conventional and CAD-CAM technologies

Comparison of accuracy of restorations generated through digital images of two extra oral scanners

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