Marginal and Internal Adaptation of Zirconia Crowns: A Comparative Study of Assessment Methods

Cunali, Rafael Schlögel; Saab, Rafaella; Correr, Gisele Maria; Cunha, Leonardo Fernandes da; Ornaghi, Bárbara Pick; Ritter, André V.; Gonzaga, Carla Castiglia

doi:10.1590/0103-6440201601531

Cited by 29 publications

(37 citation statements)

References 26 publications

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“…In the current study, the marginal and internal fit of the Ni-Cr metal copings assessed by the micro-CT technique and replica technique showed no statistical significant difference. In a study conducted by Cunali et al ,[ 28 ] they compared the marginal and internal adaptation of zirconia crowns and evaluated the marginal and internal adaptation by two different assessment techniques. They conducted the study differently, wherein the Type IV gypsum used in our current study was replaced by the regular body polyvinyl siloxane material.…”

Section: Discussionmentioning

confidence: 99%

Microcomputed tomography a noninvasive method to evaluate the fit of a restoration as compared to conventional replica technique

Ram

Ranadive

Nadgere

2019

J Indian Prosthodont Soc

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Aim: The aim of the study was to compare the assessment methods used to evaluate the fit of Ni-Cr metal copings. Settings and Design: Comparative- Invitro study design. Materials and Methods: A stainless steel die simulating a prepared first maxillary premolar was used as a master die. Wax pattern copings were fabricated by the conventional dipping wax technique ( n = 20) on the master die and were cast in Ni-Cr alloy. The finished copings were fitted on the master die and scanned by the micro-computed tomography (CT) scanner. Multiple projections of the sample were reconstructed to evaluate the marginal and internal fit at 5 predetermined locations. The same copings were used for the replica technique and were evaluated under a stereomicroscope in the same locations. Statistical Analysis Used: Shapiro–Wilk's test and Unpaired t -test Results: The marginal fit values observed were 127.71 and 95.06 μm, chamfer area fit values were 151.97 and 132.7 μm, axial area fit values were 62.36 and 46.14 μm, axio-occlusal area fit values were 139.52 and 123.6 μm, occlusal area fit values were slightly higher with 217.91 and 193.1 μm, respectively, in replica and micro-CT technique. There was no statistically significant difference observed in the fit between the two assessment methods (α > 0.05). Conclusions: There was no difference observed in the marginal and internal fit of Ni-Cr metal copings with the two methods of assessment. However, the micro-CT technique proved to be simpler, noninvasive, and time-saving assessment method.

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Section: Discussionmentioning

confidence: 99%

Microcomputed tomography a noninvasive method to evaluate the fit of a restoration as compared to conventional replica technique

Ram

Ranadive

Nadgere

2019

J Indian Prosthodont Soc

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“…There is no consensus on which is the best nondestructive method for fit assessment of indirect restorations. The replica is one of the most commonly used methods to assess both marginal and internal discrepancies 25 and has been shown to yield fit accuracy values that strongly correlate with those of micro-CT. 37 In the present study, care was taken to optimize the replicas quality and to use a large number of measuring points (65) exceeding that recommended by Groten et al 30 (50) to produce clinically relevant discrepancy measurements. In addition, the implemented experimental design limited the assessment of fit differences between groups to the material and fabrication technique by eliminating potential errors associated with repeated conventional impressions or digital scans.…”

Section: Different Methods For Measuring Fit Accuracy Have Been Repormentioning

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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“…These conditions cannot be observed only comparing the initial and final mass of the samples, leading to the search for new methodologies (8). Micro-CT is widely applied due its ability to allows three-dimensional evaluation (22). The volumetric change for endodontic materials measured by micro-CT after immersion in distilled water for time intervals of 7 and 30 days allows threedimensional evaluation, complementing the conventional solubility test (6,8).…”

Section: New Epoxy Resin-based Root Canal Sealermentioning

confidence: 99%

Physicochemical Properties and Bioactive Potential of a New Epoxy Resin-based Root Canal Sealer

et al. 2019

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The aim of this study was to evaluate physicochemical properties and bioactive potential of Sealer Plus, in comparison with MTA Fillapex, Sealapex and AH Plus. Setting time, flow, and radiopacity were evaluated based on ISO 6876 Standard. Flow was also assessed in area (mm²). The solubility and volumetric change of the sealers were evaluated after 7 and 30 days of immersion in distilled water. Solubility was evaluated by the difference in mass of materials before and after immersion. Volumetric change was evaluated by using microcomputed tomography (micro-CT). The bioactive potential was observed by Scanning Electron Microscopy (SEM) after immersion in PBS. Data were compared using ANOVA and Tukey tests (α=0.05). Sealer Plus presented the shortest setting time (196 min.) and Sealapex the longest (912 min.) (p<0.05). AH Plus showed the highest radiopacity (9.5 mm Al) and MTA Fillapex the lowest (2.7 mm Al) (p<0.05). All the sealers presented flow in accordance with ISO 6876/2012 (>17 mm). Sealer Plus showed low solubility and volumetric change (<1%), and MTA Fillapex showed the highest solubility (>25%), and volumetric change (>4%) after all time intervals (p<0.05). MTA Fillapex was the only sealer that showed bioactive potential. In conclusion, Sealer Plus presented proper physicochemical properties. However, this sealer did not present a bioactive potential.

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Marginal and Internal Adaptation of Zirconia Crowns: A Comparative Study of Assessment Methods

Cited by 29 publications

References 26 publications

Microcomputed tomography a noninvasive method to evaluate the fit of a restoration as compared to conventional replica technique

Microcomputed tomography a noninvasive method to evaluate the fit of a restoration as compared to conventional replica technique

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

Physicochemical Properties and Bioactive Potential of a New Epoxy Resin-based Root Canal Sealer

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