Marginal adaptation of zirconia complete-coverage fixed dental restorations made from digital scans or conventional impressions: A systematic review and meta-analysis

Tabesh, Mahtab; Nejatidanesh, Farahnaz; Savabi, Ghazal; Davoudi, Amin; Savabi, Omid; Mirmohammadi, Hesam

doi:10.1016/j.prosdent.2020.01.035

Cited by 57 publications

(59 citation statements)

References 31 publications

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“…Previous studies have found the internal fit values of crowns fabricated using a digital impression acquisition method to be similar to or better than that using the conventional method, supporting the use of prostheses fabricated with digital techniques [25,26]. The adaptation and fit of the prosthetic crown are guided by its relationships with the adjacent and opposing teeth, which are facilitated by the master cast [27].…”

Section: Discussionmentioning

confidence: 87%

A Comparison of Accuracy of Different Dental Restorative Materials between Intraoral Scanning and Conventional Impression-Taking: An In Vitro Study

et al. 2021

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The properties of underlying substrates influence the quality of an intraoral scan, but few studies have compared the outcomes using common restorative materials. In this study, we aimed to compare the accuracy of digital and conventional impressions recorded for four different dental materials as the substrates. Experimental crowns were produced with a metallic surface (gold or cobalt-chromium alloy (Co-Cr)) or without a metallic surface (zirconia or PMMA (polymethyl methacrylate)). A conventional impression was made in the conventional group (CON group), and gypsum models were subsequently scanned with a tabletop scanner. An intraoral scanner was used to scan the crowns either after applying a powder spray to reduce the surface reflectivity (IOS-P group) or without the powder spray (IOS group). The scans were assessed in three dimensions for precision and trueness. The accuracy did not differ between the CON and IOS groups for the non-metallic crowns. However, it was statistically different for the Co-Cr metallic crown, reducing trueness observed between groups as CON > IOS > IOS-P. The study evidences the differences in outer surface accuracy observed with a change in the substrate material to be imaged using an oral scanner and with the impression method. These findings suggest that the restoration material present in the oral cavity should be considered when selecting an impression-taking method.

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Section: Discussionmentioning

confidence: 87%

A Comparison of Accuracy of Different Dental Restorative Materials between Intraoral Scanning and Conventional Impression-Taking: An In Vitro Study

et al. 2021

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“…IOSs may provide accurate alternative impression-making procedures for tooth-and implant-supported crowns and shortspan fixed dental prostheses. [3][4][5] However, complete-arch digital scans for fabricating tooth-and implant-supported prostheses and removable partial and complete dentures have been reported to be less accurate than conventional methods. 6,7 Dental professionals can influence scanning accuracy by being aware of and managing variables that can decrease scanning accuracy, such as technology and system selection, 8,9 scanning protocol, 10 ambient light illuminance conditions, 11,12 IOS handling experience, 13 characteristics of the surface being scanned, 14,15 extension of the digital scan, 11,16 and postprocessing methods.…”

Section: Clinical Insightsmentioning

confidence: 99%

Intraoral scanners

Revilla‐León¹,

Frazier²,

Costa³

et al. 2021

The Journal of the American Dental Association

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This question allowed for multiple answers. † Other reasons for starting to use an intraoral scanner include reduced patient time in chair (42%), as a patient education tool (42%), marketing (22%), and other (19%).‡ Examples: better visualization of interocclusal space and undercut of tooth preparation. § 5% were "somewhat satisfied," 2% were "neither satisfied nor dissatisfied," and 2% were "somewhat, mostly, or completely dissatisfied." { Examples: in-office training from a sales representative and watching a video produced by the manufacturer. # Examples: watching a video, attending a continuing education course, and training by a dental laboratory.

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“…Clinically accepted MF ranges from as low as 26 μm and might exceed 200 μm [10][11][12][13][14][15][16]. Although discrepancies at the margin, ideally, are ought to be kept to a minimum, perfect margins and absolute passive framework fit are unlikely to be achieved [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Cement retention might be selected due to esthetics, passivity of fit, occlusal management, unfavorable implant inclination, less cost, and familiarity with the procedures [28][29][30]. A plethora of methods have been used for the assessment of the fit of prostheses on abutments [14,[31][32][33][34]. One of the most widely used methods is the replica technique (RT), and according to which, low viscosity light-body silicone material is applied in the crown, which is then seated on the abutment simulating the cementation procedure [14].…”

Section: Introductionmentioning

confidence: 99%

“…A plethora of methods have been used for the assessment of the fit of prostheses on abutments [14,[31][32][33][34]. One of the most widely used methods is the replica technique (RT), and according to which, low viscosity light-body silicone material is applied in the crown, which is then seated on the abutment simulating the cementation procedure [14]. Higher-viscosity silicone is then poured in the crown to stabilize the first thin silicone layer.…”

Section: Introductionmentioning

confidence: 99%

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In vitro validation of Digital Image Analysis Sequence (DIAS) for the assessment of the marginal fit of cement-retained implant-supported experimental crowns

et al. 2021

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Background The replica technique with its modifications (negative replica) has been used for the assessment of marginal fit (MF). However, identification of the boundaries between prosthesis, cement, and abutment is challenging. The recently developed Digital Image Analysis Sequence (DIAS) addresses this limitation. Although DIAS is applicable, its reliability has not yet been proven. The purpose of this study was to verify the DIAS as an acceptable method for the quantitative assessment of MF at cemented crowns, by conducting statistical tests of agreement between different examiners. Methods One hundred fifty-one implant-supported experimental crowns were cemented. Equal negative replicas were produced from the assemblies. Each replica was sectioned in six parts, which were photographed under an optical microscope. From the 906 standardized digital photomicrographs (0.65 μm/pixel), 130 were randomly selected for analysis. DIAS included tracing the profile of the crown and the abutment and marking the margin definition points before cementation. Next, the traced and marked outlines were superimposed on each digital image, highlighting the components’ boundaries and enabling MF measurements. One researcher ran the analysis twice and three others once, independently. Five groups of 130 measurements were formed. Intra- and interobserver reliability was evaluated with intraclass correlation coefficient (ICC). Agreement was estimated with the standard error of measurement (SEM), the smallest detectable change at the 95% confidence level (SDC95%), and the Bland and Altman method of limits of agreement (LoA). Results Measured MF ranged between 22.83 and 286.58 pixels. Both the intra- and interobserver reliability were excellent, ICC = 1 at 95% confidence level. The intra- and interobserver SEM and SDC95% were less than 1 and 3 pixels, respectively. The Bland–Altman analysis presented graphically high level of agreement between the mean measurement of the first observer and each of the three other observers’ measurements. Differences between observers were normally distributed. In all three cases, the mean difference was less than 1 pixel and within ± 3 pixels LoA laid at least 95% of differences. T tests of the differences did not reveal any fixed bias (P > .05, not significant). Conclusion The DIAS is an objective and reliable method able to detect and quantify MF at ranges observed in clinical practice.

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Marginal adaptation of zirconia complete-coverage fixed dental restorations made from digital scans or conventional impressions: A systematic review and meta-analysis

Cited by 57 publications

References 31 publications

A Comparison of Accuracy of Different Dental Restorative Materials between Intraoral Scanning and Conventional Impression-Taking: An In Vitro Study

A Comparison of Accuracy of Different Dental Restorative Materials between Intraoral Scanning and Conventional Impression-Taking: An In Vitro Study

Intraoral scanners

In vitro validation of Digital Image Analysis Sequence (DIAS) for the assessment of the marginal fit of cement-retained implant-supported experimental crowns

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