Marginal Adaptation of CAD/CAM All‐Ceramic Crowns Made by Different Impression Methods: A Literature Review

Memari, Yeganeh; Mohajerfar, Maryam; Armin, Anahid; Kamalian, Fatemeh; Rezayani, Vida; Beyabanaki, Elaheh

doi:10.1111/jopr.12800

Cited by 57 publications

(60 citation statements)

References 59 publications

(181 reference statements)

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“…However, Nakamura et al, reported differences in adaptation according to the configuration of the abutment tooth. The tooth preparation, scanning and analyzes was made by one operator and, then, duplicated in order to avoid creates variation operator . Cementation was not performed since the objective was to evaluate before and after crystallization process.…”

Section: Discussionmentioning

confidence: 99%

“…However, other factors were considered and evaluated, such as: the molding techniques, ceramic material, the technological innovation by the dental community with increasing as in the CAD / CAM system, and TR and microCT . The CEREC system selected has been a positive result in literature when compared with other CAD/CAM systems . However, changes continue to happen in newer scanners and software .…”

Section: Discussionmentioning

confidence: 99%

“…However, there are reports where gap measure could not correspond to the value found after milling process . According with literature review of Memari et al, there is an inconsistent result of adaptation of crown in comparison between different ceramic materials, scanner extraoral/intraoral and, comparison between intraoral scanners …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adaptation accuracy of milled lithium disilicate crowns: A 2D and 3D microCT analysis

Freitas

Tonin

Macedo

et al. 2020

J Esthet Restor Dent

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Objective: Evaluate the effects of the scanning techniques and the crystallization in the internal and marginal adaptation of milled lithium disilicate crowns by two techniques computer microtomography analysis. Materials and Methods:Sixteen polyurethane teeth prepared for a complete crown were divided into two groups according to the scanner method (n = 8): indirect (IND), dental stone models were scanned with laser-surface scanner, and direct (DIR), digital typodont creates with an intraoral scanner. Internal and marginal gap were evaluated by micro-computed tomography (microCT). The replica technique (RT) was applied for analysis of total volume (TV) and marginal volume (MV) gap in microCT. The data showed normal distribution (Shapiro-Wilk test). One-way ANOVA (scanner techniques) with repeated measures (crystallization) was performed. Multiple comparisons were performed with Bonferroni adjustment (α = .05). Results:The axial gap showed a significant difference between the times (P = .017) for lower values after crystallization. The vertical marginal gap presented a significant difference in times for higher value after crystallization (P = .001). The marginal horizontal gap IND was greater than DIR after crystallization (P = .001) and IND before lower than after crystallization. For TV was not significant difference and MV in DIR was reduction (P = .002) after crystallization. Conclusion: Crystallization changes the relationship between the crown and tooth, reducing internal gap and preventing the adequate fit in indirect and direct scanning. Clinical Significance: The measure gap under technological methodology is useful for adjust clinical parameters prosthetic in the CAD/CAM and the applicability of the new possibilities of analysis.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Adaptation accuracy of milled lithium disilicate crowns: A 2D and 3D microCT analysis

Freitas

Tonin

Macedo

et al. 2020

J Esthet Restor Dent

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“…Both processes have specific advantages and disadvantages. The conventional procedure is based on decades of experience and refined procedures, though mistakes still occur in the context of implant dentistry, such as displacement of scan abutments or dental stone expansion . The digital workflow has advantages in reproducibility and quality standardization, but one main disadvantage is that deviations in the digital impression can lead to clinically unacceptable errors …”

mentioning

confidence: 99%

Impact of Different Scan Bodies and Scan Strategies on the Accuracy of Digital Implant Impressions Assessed with an Intraoral Scanner: An In Vitro Study

Motel

Kirchner

Adler

et al. 2019

Journal of Prosthodontics

105

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Purpose: Sufficient data are not currently available on how the various geometries of scan bodies and different scan strategies affect the quality of digital impressions of implants. The purpose of this study was to present new data on these two topics and give clinicians a basis for decision making. Materials and Methods: A titanium master model containing three Nobelreplace Select TM implants (Nobelbiocare Services AG, Zurich, Switzerland) was digitized using an ATOS industrial noncontact scanner. Digitization was repeated three times with different types of scan bodies integrated into the implants: ELOS A/S, nt-trading GmbH, and TEAMZIEREIS GmbH. These three scans served as virtual master models. The titanium master model was then scanned with the TRIOS3 C digital intraoral scanner (ELOS A/S, Copenhagen, Denmark), which was used for two different scanning strategies. Strategy A was a one-step procedure that included both the titanium master model and the integrated scan bodies. Strategy B comprised two steps. First, a digital overlay was performed with a scan of the titanium master model without integrated scan bodies. A second scan was performed with the titanium master model and integrated scan bodies. By repeating both strategies 10 times for each type of scan body, 60 scans were generated and the corresponding standard tessellation language data sets overlaid with the corresponding virtual master model. Deviations in the resulting superimpositions were calculated and evaluated separately in the individual axes (x, y, z) and in three-dimensional space (Euclidean distance). Statistical evaluation was performed using the R-project software. Level of significance was determined at p ࣘ 0.05. Results: With regard to the geometry of the scan bodies, strategy A significantly influenced the accuracy of the digital implant impression in regards to Euclidean distance (p = 0.003). No significant difference was found for strategy B in this context. Comparing the two scan strategies revealed that strategy A achieved significantly higher accuracy overall (p = 0.031). Conclusion: The quality of digital intraoral impressions seems to be influenced by both the geometry of the scan body and the scan strategy. For clinical practice, the one-step scan strategy seems beneficial. Furthermore, the scan bodies of ELOS A/S showed a potential clinical advantage.

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“…Im Folgenden soll die Genauigkeit als Basis und Hilfe bei der jeweiligen Indikationsstellung dienen.Festsitzende ProthetikEinzelzahnversorgungenFür Inlays, Onlays, Teil-oder Vollkronen liefern Intraoralscanner heute klinisch gute Werte, dies nicht nur vor dem Hintergrund der Randschlussgenauigkeit, sondern ebenfalls in Bezug auf die Dimensionstreue der jeweiligen Gerüste. Hierbei sind klinische Genauigkeiten von < 100 µm möglich[2,3].…”

unclassified

Intraoralscanner im Fokus – mehr als nur eine digitale Abformung?

Schmidt¹,

Schlenz²,

Wöstmann³

2019

ZWR

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Marginal Adaptation of CAD/CAM All‐Ceramic Crowns Made by Different Impression Methods: A Literature Review

Cited by 57 publications

References 59 publications

Adaptation accuracy of milled lithium disilicate crowns: A 2D and 3D microCT analysis

Adaptation accuracy of milled lithium disilicate crowns: A 2D and 3D microCT analysis

Impact of Different Scan Bodies and Scan Strategies on the Accuracy of Digital Implant Impressions Assessed with an Intraoral Scanner: An In Vitro Study

Intraoralscanner im Fokus – mehr als nur eine digitale Abformung?

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