A Validation Study of the Impression Replica Technique

Segerström, Sofia; Faria, Johanna Wiking-Lima de; Braian, Michael; Ameri, Arman; Ahlgren, Camilla

doi:10.1111/jopr.12795

Cited by 20 publications

(14 citation statements)

References 29 publications

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“…Evaluating the marginal fit of crowns can be challenging. Although the replica technique has been validated for the evaluation of the marginal and internal fit of crowns [ 23–25 ], it does have some shortcomings and can be technique-sensitive. One of the shortcomings of this technique is a limited number of measurement points for each restoration, therefore it may not represent the true circumferential fit of a crown; however, as the technique has been used extensively in prosthodontics, it makes comparisons to other studies easier.…”

Section: Discussionmentioning

confidence: 99%

Marginal and internal fit of crowns based on additive or subtractive manufacturing

Haddadi

Ranjkesh

Isidor

et al. 2021

Biomaterial Investigations in Dentistry

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Objective To assess the marginal and internal fit of crowns manufactured by additive and subtractive manufacturing technique. Materials and Methods Twenty extracted teeth prepared for complete coverage crowns were scanned with an intra-oral scanner (Omnicam, DentsplySirona). For the subtractive manufacturing (SM) group, ten crowns were manufactured in a hybrid resin block (Vita Enamic, Vita Zahnfabrik). For the additive manufacturing (AM) group, the crowns were manufactured in a hybrid resin material (NextDent C&B, 3D systems). The design parameters were identical for the two groups. The marginal and internal fit (determined at the axial wall, the cusp tip and occlusally) was assessed before cementation with the replica technique and after cementation under stereomicroscope after sectioning of the crowned teeth. Results For the SM group, the marginal fit was 91 µm (±28 µm) before cementation and 85 µm (±18 µm) after cementation. In the AM group, the marginal fit was 75 µm (±29 µm) before cementation and 71 µm (±18 µm) after cementation. The differences were not statistically significant. As regards the internal fit, the fit at the axial wall was statistically significantly better in the SM group than in the AM group ( p =.009 before cementation and .03 after cementation). Occlusally the fit in the AM group was significantly better than in the SM group after cementation ( p <.001). Conclusion Within the limitations of the current study, the marginal fit of additively manufactured crowns is comparable to crowns manufactured with chair-side subtractive technique and within the clinically acceptable range. As regards the internal fit no one technique was consistently superior.

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Section: Discussionmentioning

confidence: 99%

Marginal and internal fit of crowns based on additive or subtractive manufacturing

Haddadi

Ranjkesh

Isidor

et al. 2021

Biomaterial Investigations in Dentistry

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“…More recently, the assessment of in vivo wear has been conducted using laser scanner technology or profilometry with tooth replicates either in acrylic resin or stone (Heintze, Cavalleri, Forjanic, Zellweger, & Rousson, 2006;Mehl, Gloger, Kunzelmann, & Hickel, 1997;Pintado, Anderson, DeLong, & Douglas, 1997;Rodriguez & Bartlett, 2010;Rodriguez, Curtis, & Bartlett, 2009;Schlueter, Ganss, Sanctis, & Klimek, 2005). While this has proven to be effective, there are some errors involved in the replication process with the impression and the replicating materials (Hsu et al, 2019;Rodriguez & Bartlett, 2010;Segerström, Wiking-Lima de Faria, Braian, Ameri, & Ahlgren, 2018). Also, the resolution accuracy of the laser scanners varies from 5 to 20 μm and can affect the quantification of wear.…”

Section: Introductionmentioning

confidence: 99%

Novel methodology for measuring intraoral wear in enamel and dental restorative materials

Esquivel‐Upshaw

Hsu

Bohórquez

et al. 2020

Clinical & Exp Dental Res

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Objectives To test the hypotheses that (a) the chairside/handheld dental scanner combined with a metrology software will measure clinical wear in vivo in agreement with measurements from X‐ray computed microtomography and; (b) polished monolithic zirconia does not cause accelerated wear of opposing enamel. Materials and methods Thirty single crowns were randomized to receive a monolithic zirconia or metal‐ceramic crown. Two non‐restored opposing teeth in the same quadrants were identified to serve as enamel controls. After cementation, quadrants were scanned using an intraoral dental scanner. Patients were recalled at 6‐months and 1‐year for re‐scanning. Scanned images were compared using a metrology software to determine maximum vertical wear of teeth. The accuracy of the scanning measurements from this new method was compared with X‐ray computed microtomography (micro‐CT) measurements. Statistical analysis was performed using Mann–Whitney U test to determine significant differences between wear of enamel against zirconia, metal‐ceramic or enamel. Linear regression analysis determined agreement between measurements obtained using intraoral scanning and micro‐CT. Results Regression analysis demonstrated that there is a quantitative agreement between depth and volume measurements produced using intraoral scanning and the micro‐CT methodologies. There was no significant difference between the wear of enamel against polished monolithic zirconia crowns and enamel against enamel. Conclusions Intraoral scanning combined with a matching software can accurately quantify clinical wear to verify that monolithic zirconia exhibited comparable wear of enamel compared with metal‐ceramic crowns and control enamel. Agreement between the intraoral scanner and the micro‐CT was 99.8%. Clinical Trials.gov NCT02289781.

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“…The results show that the impression replica technique using only slices of the 2 D fit may be as accurate as the triple-scan protocol for internal fit measurements. Other studies have evaluated the impression replica technique for validity and reliability and have concluded that it has a tendency to overestimate the gap with 2 to 11% and have moderate variations in reliability [5,6]. For cervical area gap and internal gap, the impression replica technique had slightly higher values but these differences were not statistically significant.…”

Section: Discussionmentioning

confidence: 94%

Comparison of the 3D triple-scan protocol and the impression replica technique for 3-unit tooth-supported fixed dental prostheses

Svanborg

Andersson

Reinedahl

et al. 2019

Biomaterial Investigations in Dentistry

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Objective: The aim of this study was to compare the fit measurements from the 3 D triple-scan protocol and the impression replica technique, by measuring the fit of three-unit tooth-supported fixed dental prostheses. Materials and methods: The results from an earlier study using the triple-scan protocol were compared to results from the impression replica technique for absolute marginal gap, cervical area gap and internal gap. Results: There were no differences for cervical area gap or internal gap, but for absolute marginal gap the impression replica technique obtained significantly smaller fit values. Conclusion: The impression replica technique and the triple-scan protocol may both be used to measure the fit of tooth-supported restorations. However, the scanner used for the triple-scan protocol must be able to obtain scan points at the outermost edge of the restorations when used for absolute marginal gap.

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A Validation Study of the Impression Replica Technique

Abstract: The impression replica technique overestimates gaps within the range of 2% to 11%. The validation of the replica technique enables the method to be used as a reference when testing other methods for evaluating fit in dentistry.

Cited by 20 publications

References 29 publications

Marginal and internal fit of crowns based on additive or subtractive manufacturing

Marginal and internal fit of crowns based on additive or subtractive manufacturing

Novel methodology for measuring intraoral wear in enamel and dental restorative materials

Comparison of the 3D triple-scan protocol and the impression replica technique for 3-unit tooth-supported fixed dental prostheses

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