Comparison of three-dimensional digital technique with two-dimensional replica method for measuring marginal and internal fit of full coverage restorations

Abstract

PURPOSE. This study compared digital (reference point matching) and replica methods for measuring marginal and internal fit of full coverage restorations. MATERIALS AND METHODS. A maxillary left first molar typodent was fixed on to an aluminum base and prepared to receive all-ceramic full coverage restoration. The model was scanned with an intraoral scanner (CEREC Omnicam, Sirona, York, PA, USA). Twelve crowns were fabricated from lithium disilicate blocks (IPS emax CAD, Ivoclar Vivadent) and then crystalized. Marginal and internal fit of each restoration was measured by two examiners using replica and a new digital three-dimensional technique. Reliability between the two methods and two examiners was assessed by correlation and Cronbach's Alpha coefficient (P<.05). A Bland-Altman assessment for agreement was used to compare the two methods. RESULTS. Bland-Altman assessment showed that the mean of difference for marginal, absolute marginal, and axial gap was respectively-1.04 µm,-41.9 µm, and-29.53 µm with limit of agreement (LOA) between-37.26 to 35.18 µm for marginal,-105.85 to 22.05 µm for absolute marginal and-80.52 to 22.02 µm for axial gap. Positive correlation for repeatability (P<.05) in determining marginal and internal gaps by the two examiners in both techniques was revealed. Reliability of both techniques in all sites of measurements was at least good (0.8 ≤ α < 0.9). CONCLUSION. Both measuring techniques appeared highly reliable for evaluating fit of fixed dental restorations, while reference point matching provided higher values in axial and absolute marginal gap assessment. [ J Adv

Effect of ceramic materials and tooth preparation design on computer‐aided design and computer‐aided manufacturing endocrown adaptation and retentive strength: An in vitro study

“…A nondestructive replica technique (RT) has been chosen to evaluate the adaptation of endocrowns. The RT has been selected to evaluate marginal and internal discrepancies by previous studies (El Ghoul & Salameh, 2021;Hasanzade et al, 2020;Yang et al, 2020).…”

Effect of a new support design on the marginal and internal gap of additively manufactured interim crowns using direct light deposition technology

“…43 These measurement methods have been shown to be quite accurate in assessing the fit of fixed dental restorations. [44][45][46] The replica technique is the most commonly used 2D clinical tool for investigating the internal and marginal adaptation of restorations. This approach is noninvasive, easy, and inexpensive, with adequate accuracy.…”

“…Each of them has advantages and disadvantages 43 . These measurement methods have been shown to be quite accurate in assessing the fit of fixed dental restorations 44–46 . The replica technique is the most commonly used 2D clinical tool for investigating the internal and marginal adaptation of restorations.…”

Triple scan evaluation of internal and marginal adaptation of overlays using different restorative materials

“…The main advantage of the non‐invasive technique is that the marginal gap can be measured at the entire circumference of the intaglio of the restoration on different points without tooth damage 48,50–53 . The Triple‐scan technique is a non‐invasive method used to assess the marginal and internal gap of dental restorations 15,54–58 . The purpose of this in vitro study was to evaluate the interface quality of overlays fabricated with three different materials using the Triple‐scan method with a dental laboratory scanner (Wieland, Ivoclar‐Vivadent, Germany).…”

“…48,[50][51][52][53] The Triple-scan technique is a non-invasive method used to assess the marginal and internal gap of dental restorations. 15,[54][55][56][57][58] The purpose of this in vitro study was to evaluate the interface quality of overlays fabricated with three different materials using the Triple-scan method with a dental laboratory scanner (Wieland, Ivoclar-Vivadent, Germany). The hypothesis tested was that different materials had significant influence on the axial, marginal, pulpal, and gingival adaptation of the overlays fabricated.…”