Marginal adaptation of castable ceramic crowns

Weaver, James D.; Johnson, Glen H.; Bales, David J.

doi:10.1016/0022-3913(91)90408-o

Cited by 119 publications

(96 citation statements)

References 9 publications

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“…The 90° angled shoulder preparation used has been recommended and tested by several authors with successful results. 2,27,29,30,31 Most authors agreed that preference should be given to rounded axiogingival line angles. 27,32 The main advantage of using artificial abutments is the possibility to make a standardised preparation easier.…”

Section: Discussionmentioning

confidence: 99%

“…Digital microscopes, stereomicroscopes, light microscopes and electron microscopes have been used with various magnifications. [2][3][4][5]10,22,27,29,30,[33][34][35][36] According to Groten et al 28 approximately 50 measurements along the margin of a crown yield clinically relevant information. A consistent estimate for the gap size with an overall impact on the measurement error was typically in a range of ± 8µm (SD).…”

Section: Discussionmentioning

confidence: 99%

“…[2][3][4][5] Before cementation, the MC FPD presented a marginal discrepancy (geometric mean) of 53 µm, the Empress®2 FPD 57 µm and the EPC FPD 55 µm. Considering a clinically acceptable range for marginal gap of 50 and 100 µm, 37,38,39 almost all restorations presented clinically acceptable marginal accuracy.…”

Section: Discussionmentioning

confidence: 99%

“…1 The marginal fit of all-ceramic crowns has been the focus of various investigations. [2][3][4][5] The extent of misfit of dental restorations is closely associated with the development of secondary caries and periodontitis. [6][7][8] Misfit in all-ceramic crowns can also affect their fracture strength 9 and thus reduce longevity.…”

Section: Introductionmentioning

confidence: 99%

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Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

et al. 2004

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Purpose This study compares the marginal accuracy of posterior metal ceramic (MC), all-ceramic IPS Empress®2 and experimental pressed ceramic (EPC-VP 1989/4) three-unit fixed partial dentures (FPD), before and after luting and after thermo-mechanical fatigue in a dual-axis chewing simulator. Materials and methods Caries-free human teeth (n=160) were used as abutments for the fabrication of eighty posterior three-unit FPD, divided into two test-groups, IPS Empress®2 and EPC, of 32 samples each and one control group of 16 samples metal ceramic FPD. All FPD were cemented with Variolink®II dual-curing resin cement. Half of the samples in each group were exposed to a dual-axis chewing simulator. Results The geometric mean marginal gap values (µm, before cementation, after cementation and after thermo-mechanical fatigue) amounted to 53, 63 and 62 for the ceramic metal FPD, 57, 71 and 68 for the Empress®2 FPD and 55, 67 and 68 for the EPC FPD. In all groups a statistically significant increase in marginal gap width was observed after cementation. The effect of functional loading in the chewing simulator on marginal gap was not significant. Marginal gap was lowest in the control group but differences with all-ceramic materials were small in all evaluation stages. Conclusion Within the limits of this investigation, it can be concluded that marginal gap values of these all-ceramic materials and conventional MC techniques are on a similar level. In particular, almost all marginal gap values observed in this study were within the limits of clinical acceptance.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

et al. 2004

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“…18 Kenar ve iç yüzey uyumun değerlendirilmesi amacıyla yapılan birçok çalışmada ölçüm noktalarının sayısı konusunda, literatürde ortaya konan herhangi bir standart bulunmamaktadır. 9,10,13,14,[20][21][22] Kenar ve iç yüzey uyumun değerlendirilmesi amacıyla ölçümlerin yapılacağı noktaların sayılarının arttırılmasının, istatistiksel olarak standart sapmayı azaltarak, elde edilen sonuçların hem istatistiksel, hem de kliniği yansıtması açısından daha güvenilir olacağı belirtilmiştir. 23 Çalış-mamızda, kenar ve iç yüzey uyumu değerlendirmek için yapılan çalışmalarda kullanılan ölçüm noktaları, sonuçların güvenilirliğini arttıracak şekilde modifiye edilerek belirlendi.…”

Section: Discussionunclassified

Bi̇lgi̇sayar Destekli̇ Tasarim-Bi̇lgi̇sayar Destekli̇ Üreti̇m Ve Presleme Si̇stemleri̇yle Üreti̇len Porselen Lami̇nat Venerleri̇n Kenar Ve İnternal Uyumlarinin Karşilaştirilmasi: i̇n-Vi̇tro Çalişma

Yüce¹,

Türk²

2017

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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ÖZAmaç: Çalışmanın amacı, Bilgisayar destekli tasarım-Bilgisayar destekli üretim ve Isı ile Presleme yöntemleriyle üretilmiş porselen laminat venerlerin kenar ve iç yüzey uyumlarının karşılaştırılmasıdır. Gereç ve yöntem: Kenar ve iç yüzey uyumlarının fabrikasyon tekniğine göre farklılık gösterip göster-mediğini belirlemek amacıyla toplam 40 adet porselen laminat vener değerlendirildi. Venerler, Bilgisayar destekli tasarım-Bilgisayar destekli üretim ve Isı ile Presleme yöntemleriyle üretildi (n=20). Kenar ve iç yüzey uyumları replika tekniği kullanılarak değerlendirildi. Her bir venerin replikası akışkan kıvamlı elastomerik ölçü materyali kulanı-larak alındı ve replikalar, meziyo-distal ve insizo-gingival yönde kesildi. Her bir kesitin iç yüzey ve kenar uyumları ışık mikroskobunda x40 büyütme kullanılarak ölçüldü. İç yüzey uyumu için 9 nokta, kenar uyum içinse 3 nokta ölçüldü ve ortalamaları alındı. Levene ve independent samples t testi kullanılarak istatistiksel analiz yapıldı (p<0,05). Bulgular: Isı ile Presleme sistemi ile üretilen venerlerin kenar aralık değerleri (269±136,92 μm), Bilgisayar destekli tasarım-Bilgisayar destekli üretim ile üretilenlere (192±61,02 μm) göre daha yüksektir (p= 0,028). İki yöntemin iç yüzey aralık değerleri karşılaştırıldığında yine, Isı ile Presleme sistemi ile üretilen venerlerin iç yüzey aralık değerleri (190,43±63,33 μm), Bilgisayar destekli tasarım-Bilgisayar destekli üretim ile üretilenlere (105,61±24,39 μm) göre daha yüksektir (p=0,00). Sonuç: Bu çalışmanın kısıtlamaları dahilinde, Bilgisayar destekli tasarım-Bilgisayar destekli üretim yöntemi ile üre-tilen porselen laminat venerlerin kenar ve iç yüzey uyumları, Isı ile Presleme sistemi ile üretilenlere göre daha iyidir. Anahtar Kelimeler: Laminat vener, Bilgisayar destekli tasarım-Bilgisayar destekli üretim, Isı ile Presleme, Kenar uyum, İç yüzey uyumu, Replika yöntemi ABSTRACT Aim: The aim of this study was to evaluate the marginal and internal adaptations of porcelain laminate veneers produced with Computer aided design-Computer aided manufacturing and Heat-pressed techniques. Material and Methods: A total of 40 porcelain laminate veneers were evaluated whether the marginal and internal adaptations are changed due to fabrication technique. The veneers were fabricated with Computer aided design-Computer aided manufacturing and Heatpressed techniques (n=20). The marginal and internal adaptations of veneers were measured by using a replica technique. Replicas of each veneer were obtained by using a light-body silicone impression material. The replicas were sectioned mesio-distally and gingivoincisally. Then the marginal and internal gap adaptation of each cross section were measured by a stereomicroscope at x40 magnification. Nine measurement locations for internal, 3 measurement locations for marginal adaptation were used to obtain the mean values. Levene and independent samples t-test was used to identify the statistical difference among the groups (p<0.05). Results

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Precision of fit: zirconia three-unit fixed dental prostheses

et al. 2008

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The purpose of this in vitro study was to compare the precision of fit of substructures milled from semi-sintered zirconia blocks fabricated with two different computer-assisted design (CAD)/computer-assisted manufacturing (CAM) systems. Three-unit posterior fixed dental prostheses (FDP) were fabricated for standardized dies (n = 10) with the Lava CAD/CAM system (Lava) and the Procera-bridge-zirconia CAD/CAM system (Procera). After cementation to the dies, the FDP were embedded and sectioned. Four cross-sections were made of each abutment tooth, and marginal and internal fit were evaluated under an optical microscope. A one-way analysis of variance was used to compare data (alpha = 0.05). Mean gap dimensions at the marginal opening for Lava and Procera were 15 (+/-7) microm and 9 (+/-5) microm, respectively. Mean marginal openings (P = 0.012) and internal adaptation at two out of three measurement locations were significantly different. Within the limitations of this study, the results suggest that the accuracy of both investigated systems is satisfactory for clinical use.

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Marginal adaptation of castable ceramic crowns

Cited by 119 publications

References 9 publications

Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

Bi̇lgi̇sayar Destekli̇ Tasarim-Bi̇lgi̇sayar Destekli̇ Üreti̇m Ve Presleme Si̇stemleri̇yle Üreti̇len Porselen Lami̇nat Venerleri̇n Kenar Ve İnternal Uyumlarinin Karşilaştirilmasi: i̇n-Vi̇tro Çalişma

Precision of fit: zirconia three-unit fixed dental prostheses

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