Vertical marginal fit of zirconia copings fabricated with one direct and three indirect digital scanning techniques

Akhlaghian, Marzieh; Khaledi, Amir-Alireza; Farzin, Mitra; Pardis, Soheil

doi:10.1016/j.prosdent.2020.03.028

Cited by 9 publications

(10 citation statements)

References 35 publications

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“…However, these values remain clinically acceptable. In previous studies, 26,37,38 acceptable values ranged from 34 to 120 μm. The standard deviations of this study (Tables 2 and 3) ranged from 6.63 to 35.27 μm.…”

Section: Discussionmentioning

confidence: 95%

“…The maxillary and mandibular arches were scanned, and the occlusion was digitized. All standard tessellation language (STL) files were checked and transferred to the laboratory via a secure platform 26 . For the control group (CI), nine CIs were made with polyvinyl siloxane (PVS) (Extrude Xtra, Kerr) using a one‐step two‐viscosity technique, and their quality was evaluated using the form proposed by Haddadi et al 27 .…”

Section: Methodsmentioning

confidence: 99%

“…All standard tessellation language (STL) files were checked and transferred to the laboratory via a secure platform. 26 For the control group (CI), nine CIs were made with polyvinyl siloxane (PVS) (Extrude Xtra, Kerr) using a one-step two-viscosity technique, and their quality was evaluated using the form proposed by Haddadi et al 27 The antagonist arch impression was taken with alginate, and the occlusion registration was made with occlusion silicone. The CIs were disinfected by glutaraldehyde-based disinfectant as described by Demajo et al 28 It has been shown by these authors that chemical disinfection with this product eliminates all microbial forms of silicone without changing the dimensional stability.…”

Section: Methodsmentioning

confidence: 99%

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Marginal and internal fit of five‐unit zirconia‐based fixed dental prostheses fabricated with digital scans and conventional impressions: A comparative in vitro study

Bandiaky¹,

Clouet

Bars

et al. 2023

Journal of Prosthodontics

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PurposeThis study aimed to compare the marginal and internal fit of five‐unit zirconia‐based fixed dental prostheses (FDPs) fabricated using digital scans and conventional impressions.Materials and methodsNine master models with three zirconia abutments were scanned with an intraoral scanner (test group), and nine conventional impressions (control group) of these same models were also made. The stone casts from these impressions were scanned with a laboratory extraoral scanner (D700, 3Shape, Copenhagen, Denmark). A total of 18 five‐unit zirconia‐based FDP frameworks (test group, n = 9; control group, n = 9) were manufactured. Marginal and internal fit (in μm) were evaluated using the replica method under micro‐computed tomography. Analysis of variance (one‐way ANOVA) and Kruskal–Wallis tests were used to compare continuous variables across two groups. A level of p < 0.05 was accepted as statistically significant.ResultsThe mean ± standard deviation of the marginal fit was 95.03 ± 12.74 μm in the test group and 106.02 ± 14.51 μm in the control group. The lowest marginal mean value was observed in the test group, with a statistically significant difference compared to the control group (F = 14.56, p < 0.05). The mean ± standard deviation of the internal fit was 103.61 ± 9.32 and 106.38 ± 7.64 μm, respectively, in the test and control groups, with no statistically significant difference (F = 1.56, p > 0.05). The mean values of both groups were clinically acceptable.ConclusionsThe five‐unit zirconia‐based FDPs fabricated with digital scans showed better fit than those in the conventional impression group. Within the limitations of this study, these results are encouraging, and continued progress in the digital field should allow for more accurate long‐span restorations.

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Section: Discussionmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Marginal and internal fit of five‐unit zirconia‐based fixed dental prostheses fabricated with digital scans and conventional impressions: A comparative in vitro study

Bandiaky¹,

Clouet

Bars

et al. 2023

Journal of Prosthodontics

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“…Akhlaghian ve ark.nın yaptığı çalışmada bu çalışmaya benzer olarak, alçı modelin tarandığı grupta Trios tarayıcı grubuna göre daha büyük marjinal aralık değeri kaydedilmiştir. 30 İndirekt dijital ölçü grubunun direkt ölçü grubuna göre istatistiksel olarak daha büyük marjinal aralık değeri göstermesi, geleneksel ölçü iş akışının ölçü ve alçının doğruluğunu etkileyen bir dizi faktör ve teknik hassasiyet gerektiren fazla basamağa sahip olması olabilir. Bunun yanında PVS ölçü maddesinin %0,14-0,17 ve Tip IV alçının %0,5-0,06 arasında lineer kontraksiyona sahip olması da aralık değerini etkileyen sebeplerden olabilir.…”

Section: Discussionunclassified

Evaluation of Marginal and Internal Gap of Zirconia Reinforced Lithium Silicate Crowns Fabricated by CAD-CAM System from Measurements Obtained with Different Digital Scanners: An In Vtro Study

AYDIN¹,

Yanıkoğlu²

2022

Turkiye Klinikleri J Dental Sci

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Bu in vitro çalışmada, farklı tarayıcı sistemler kullanılarak alınan ölçülerden, bilgisayar destekli tasarım ve bilgisayar destekli üretim [computer-aided design/computer-aided manufacturing (CAD/CAM)] yöntemi kullanılarak elde edilen zirkonya ile güçlendirilmiş lityum silikat kuronların marjinal ve internal aralık değerlerinin karşılaştırılması amaçlanmıştır. Gereç ve Yöntemler: Fantom çene üzerinde maksiller sağ 1. premolar dişin preparasyonu yapıldı. Restorasyonun üretilebilmesi için gerekli ölçüler, 3 farklı direkt dijital tarayıcı (Primescan, Trios 4, iTero Element 2) ve 1 adet indirekt dijital tarayıcı (Ceramill MAP400) ile elde edildi (4 grup, n=12). Restorasyonlar, zirkonya ile güçlendirilmiş lityum silikat bloklardan 5 akslı freze ünitesi ile üretildi. Marjinal aralık ve internal aralık değerleri, silikon replika yöntemi ile x10 büyütmeli ışık mikroskobu altında ölçüldü. Üç ve üzeri gruplara göre normal dağılmayan uyum değerlerinin karşılaştırılmasında Kruskal-Wallis; 2'li gruplara göre normal dağılmayan verilerin karşılaştırılmasında Mann-Whitney U testi kullanıldı. (p<0,05). Bulgular: Direkt yöntem, indirekt yönteme göre istatistiksel olarak daha düşük marjinal ve internal aralık değeri gösterdi (p<0,05). Ağız içi tarayıcılar arasında, marjinal ve internal aralık değeri bakımından istatistiksel olarak anlamlı düzeyde farklılık olduğu saptandı (p<0,05). En düşük uç aralık değeri Trios 4 (73,4±27,8 µm) ağız içi tarayıcısında kaydedildi. En düşük internal aralık değeri iTero Element 2 (81,6±36,8 µm) ağız içi tarayıcısında elde edildi. Sonuç: İntraoral dijital tarayıcılar kullanılarak, CAD-CAM yöntemiyle üretilen kuron restorasyonlardan klinik olarak kabul edilebilir marjinal ve internal aralık değeri elde edilmiştir (<90 µm). Ağız içi ve ağız dışı dijital tarayıcılardan elde edilen kuron restorasyonların, marjinal ve internal aralık değeri istatistiksel olarak anlamlı düzeyde farklılık göstermiştir (p<0,05). Anah tar Ke li me ler: CAD-CAM; internal aralık; marjinal aralık; zirkonya ile güçlendirilmiş lityum silikat ABS TRACT Objective: In this in vitro study, it was aimed to compare the marginal and internal gap values of zirconia reinforced lithium silicate crowns fabricated using the computer-aided design/computeraided manufacturing method from the measurements taken using different scanning systems. Material and Methods: The maxillary right 1st premolar tooth was prepared on the phantom jaw. The necessary impression for the restoration were obtained with 3 different direct digital scanners (Primescan, Trios 4, iTero Element 2) and 1 indirect digital scanner (Ceramill MAP400) (4 groups, n=12). The restorations were fabricated from lithium silicate blocks reinforced with zirconia with a 5-axis milling unit. Marginal gap and internal gap values were measured using the silicon replica method under a light microscope with x10 magnification. In the comparison of non-normally distributed fit values for groups of 3 or more, Kruskal-Wallis; Mann-Whitney U test was used to compare data that were not normally dis...

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“…Secondly, we did not compare our optical scans to a different physical measurement of the grinding surface. Optical scanning has been shown to be a valuable and accurate tool in digital dentistry [25][26][27] and is used for various dental applications [28,29]. More specifically, the trueness and precision of the 3D scanner used in this study has been assessed for complete arch scans by multiple previous studies [30][31][32].…”

Section: Discussionmentioning

confidence: 99%

A Novel Quantitative Method for Tooth Grinding Surface Assessment Using 3D Scanning

et al. 2021

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Sleep bruxism is an oral parafunction that involves involuntary tooth grinding and clenching. Splints with a colored layer that gets removed during tooth grinding are a common tool for the initial diagnosis of sleep bruxism. Currently, such splints are either assessed qualitatively or using 2D photographs, leading to a non-neglectable error due to the 3D nature of the dentition. In this study we propose a new and fast method for the quantitative assessment of tooth grinding surfaces using 3D scanning and mesh processing. We assessed our diagnostic method by producing 18 standardized splints with 8 grinding surfaces each, giving us a total of 144 surfaces. Moreover, each splint was scanned and analyzed five times. The accuracy and repeatability of our method was assessed by computing the intraclass correlation coefficient (ICC) as well reporting means and standard deviations of surface measurements for intra- and intersplint measurements. An ICC of 0.998 was computed as well as a maximum standard deviation of 0.63 mm2 for repeated measures, suggesting an appropriate accuracy of our proposed method. Overall, this study proposes an innovative, fast and cost effective method to support the initial diagnosis of sleep bruxism.

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Vertical marginal fit of zirconia copings fabricated with one direct and three indirect digital scanning techniques

Cited by 9 publications

References 35 publications

Marginal and internal fit of five‐unit zirconia‐based fixed dental prostheses fabricated with digital scans and conventional impressions: A comparative in vitro study

Marginal and internal fit of five‐unit zirconia‐based fixed dental prostheses fabricated with digital scans and conventional impressions: A comparative in vitro study

Evaluation of Marginal and Internal Gap of Zirconia Reinforced Lithium Silicate Crowns Fabricated by CAD-CAM System from Measurements Obtained with Different Digital Scanners: An In Vtro Study

A Novel Quantitative Method for Tooth Grinding Surface Assessment Using 3D Scanning

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