Can lithium disilicate ceramic crowns be fabricated on the basis of CBCT data?

Kauling, Ana Elisa Colle; Keul, Christine; Erdelt, Kurt; Kühnisch, Jan; Güth, Jan‐Frederik

doi:10.1007/s00784-019-02802-6

Cited by 8 publications

(9 citation statements)

References 37 publications

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“…Most evaluation methods described cannot be applied in patients without tooth extraction [13][14][15]. Thus, the indirect conventional silicone replica is still the most common approach in studies investigating the internal fit of FDPs in patients [16][17][18][19][20]. Though, this method is limited to two-dimensional analysis with a small number of measurement points.…”

Section: Introductionmentioning

confidence: 99%

New Intraoral Scanner-Based Chairside Measurement Method to Investigate the Internal Fit of Crowns: A Clinical Trial

Schlenz

Vogler

Schmidt

et al. 2020

IJERPH

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To measure the internal fit of the computer-aided designed/computer-aided manufactured (CAD/CAM) crowns, a new scanner-based chairside approach was investigated in patients, and the results were compared to the established silicone replica technique and a digital laboratory replica method. Thirty full-coverage crown preparations were included. Based on a digital impression with an intraoral scanner (IOS, Trios 3), three CAD/CAM measurement copings (‘COM’, resin composite; ‘ZIR’, zirconium dioxide; ‘NPA’, non-precious alloy) were fabricated for each tooth preparation. The internal fit of the measurement copings was analyzed with three different evaluation methods: IOS-based digital approach (D-IOS), digital replica method with laboratory software (D-GOM), and conventional silicone replica technique (CV-SR). The congruence between the determined target parameter of the 80-µm cement space and the actual measured internal gap was investigated. Statistical analysis was performed by ANOVA (p-value < 0.05). No significant difference was determined between the three evaluation methods. However, significant differences were observed for the three coping materials (p-value < 0.05), the single measurement position (marginal, axial, and occlusal fit) (p-value < 0.05), and the interaction between the coping material and the measurement position (p-value < 0.05). COM revealed the smallest internal gap, followed by ZIR and NPA. Regardless of the coping material, the occlusal gap was higher than the axial and marginal gaps. Furthermore, only the internal gaps of the marginal area almost matched the target parameter of 80-µm for the cement space. D-IOS is effective for measuring internal fit of single crowns in different clinical settings.

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Section: Introductionmentioning

confidence: 99%

New Intraoral Scanner-Based Chairside Measurement Method to Investigate the Internal Fit of Crowns: A Clinical Trial

Schlenz

Vogler

Schmidt

et al. 2020

IJERPH

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“…Finally, 18 studies (12 in vitro 1,2,12–21 and 6 in vivo 3,7,22–25 ) were selected for review and meta‐analysis (Fig 1 and Table S1). Pooled data of 645 subjects were extracted.…”

Section: Resultsmentioning

confidence: 99%

“…The choice of impression material among all these studies was polyvinyl siloxane, while many different intraoral scanners were used. A total of 12 studies compared intraoral scanners with extraoral scanners, and similarly, different intra‐ and extraoral scanners were evaluated in these studies 1,3,7,13,14,16–18,20,22,24,25 . A summary of scanners used in the reviewed publications is presented in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…A total of 12 studies compared intraoral scanners with extraoral scanners, and similarly, different intra-and extraoral scanners were evaluated in these studies. 1,3,7,13,14,[16][17][18]20,22,24,25 A summary of scanners used in the reviewed publications is presented in Table 2. The marginal discrepancy was measured with one of the following methods: replica, 3,7,16,18,20,[22][23][24][25] micro-CT, 2,13,16,19 stereomicroscopy, 12,15,21 light microscopy, 14 scanning electron microscopy, 17 and an allegedly newer method using a laser coordinate measuring machine (CMM).…”

Section: Resultsmentioning

confidence: 99%

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Marginal Accuracy of Lithium Disilicate Full‐Coverage Single Crowns Made by Direct and Indirect Digital or Conventional Workflows: A Systematic Review and Meta‐Analysis

Tabesh

Nejatidanesh

Savabi

et al. 2022

Journal of Prosthodontics

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Purpose Several studies have compared digital intraoral scanners and conventional impressions. The accuracy of these two methods in terms of marginal accuracy of lithium disilicate crowns is not well‐established, yet. The purpose of this study was to systematically review available publications on marginal fit of single‐unit, full‐coverage, tooth‐supported lithium disilicate restorations. Methods Pubmed, Web of Science, Cochrane, EMBASE, and Scopus were electronically searched along with a manual search. After critical appraisal, data from selected studies were extracted and mean marginal difference with a 95% confidence interval was calculated. Meta‐analysis of the collected data was conducted using STATA software. Results The meta‐analysis revealed similar marginal gap values in intraoral scanners with conventional groups (p>0.05) and in intraoral scanners with extraoral canners (p>0.05). Conclusion No significant difference was seen between digital and conventional impressions or intra‐ and extraoral scanners for marginal accuracy of lithium disilicate crowns.

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“…CBCT, which provides essential 3D diagnostic information to dentists [27], has recently been considered as an alternative scanning method to acquire digital models for use in orthodontics, surgical guides, and restorative prostheses [28][29][30][31]. It has been verified that the accuracy of CBCT-scanned data is within the clinically acceptable range, although CBCT-scanned data are less accurate than those obtained by optical scanning [14,28].…”

Section: Introductionmentioning

confidence: 99%

Accuracy evaluation of 3D printed interim prosthesis fabrication using a CBCT scanning based digital model

et al. 2020

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This study aimed to evaluate the marginal and internal gaps in 3D-printed interim crowns made from digital models of cone-beam computed tomography (CBCT) conversion data. Materials and methods Sixteen polyvinylsiloxane impressions were taken from patients for single crown restorations and were scanned using CBCT. The scanning data were converted to positive Standard Triangulation Language (STL) files using custom-developed software. The fabricated stone models were scanned with an intraoral optical scanner (IOS) to compare the surface accuracy with the STL data obtained by CBCT. The converted STL files were utilized to fabricate interim crowns with a photopolymer using a digital light-processing 3D printer. The replica method was used to analyze the accuracy. The marginal and internal gaps in the replica specimen of each interim crown were measured with a digital microscope. The Friedman test and Mann-Whitney U test (Wilcoxon-signed rank test) were conducted to compare the measurements of the marginal and internal gaps with a 95% level of confidence. Results The root-mean-square values of the CBCT and IOS ranged from 41.00 to 126.60 μm, and the mean was 60.12 μm. The mean values of the marginal, internal, and total gaps were 132.96 (±139.23) μm, 137.86 (±103.09) μm, and 135.68 (±120.30) μm, respectively. There were no statistically significant differences in the marginal or internal gaps between the mesiodistal and buccolingual surfaces, but the marginal area (132.96 μm) and occlusal area (255.88 μm) had significant mean differences. Conclusion The marginal gap of the fabricated interim crowns based on CBCT STL data was within the acceptable range of clinical success. Through ongoing developments of high-resolution

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Can lithium disilicate ceramic crowns be fabricated on the basis of CBCT data?

Cited by 8 publications

References 37 publications

New Intraoral Scanner-Based Chairside Measurement Method to Investigate the Internal Fit of Crowns: A Clinical Trial

New Intraoral Scanner-Based Chairside Measurement Method to Investigate the Internal Fit of Crowns: A Clinical Trial

Marginal Accuracy of Lithium Disilicate Full‐Coverage Single Crowns Made by Direct and Indirect Digital or Conventional Workflows: A Systematic Review and Meta‐Analysis

Accuracy evaluation of 3D printed interim prosthesis fabrication using a CBCT scanning based digital model

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