Resistance to Fracture of Three All‐Ceramic Systems

Neiva, Gisele F.; Yaman, Peter; Dennison, Joseph B.; Razzoog, Mph Michael E.; Lang, Brien R.

doi:10.1111/j.1708-8240.1998.tb00339.x

Cited by 58 publications

(56 citation statements)

References 6 publications

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“…The high-strength ceramics allow fabrication of restorations with optimal esthetics, good biocompatibility, excellent periodontal tissue response, as well as the necessary mechanical properties to withstand functional stresses 7 . Moreover the improved potential of these silisium based ceramics to bond to enamel and dentin has made metal-free restorations clinically acceptable 8 .…”

Section: Discussionmentioning

confidence: 99%

Treating a Traumatised Maxillary Central Insizor With Monoblock Post-Core-Crown Restoration: A Case Report

Ekren¹,

Gürbüz²

2015

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Fabricating a restoration which can serve clinically long term without any sign of complication and fulfill the functional and esthetic requirement is very hard to achieve in excessivelly damaged tooth especially when it is in the esthetic zone. The following case report presents an alternate method for the treatment of excessively damaged tooth which can diminish the ability of complication in the traditional treatment modality and as well as can fulfill the esthetic and functional demands of the patient.

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Section: Discussionmentioning

confidence: 99%

Treating a Traumatised Maxillary Central Insizor With Monoblock Post-Core-Crown Restoration: A Case Report

Ekren¹,

Gürbüz²

2015

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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“…Örneklerin hazırlanmasında standardizasyonun sağlanması ve makaslama bağlanma dayanık-lılığı için hazırlanacak örneklerde yeterli genişlikte bağ-lanma yüzeylerinin elde edilmesi amaçları ile çalışma-mızda periodontal ve protetik nedenlerle çekilmiş, çürüksüz ve kron kısmında herhangi bir defekt, restorasyon ya da çatlak içermeyen üst çene anterior kesici dişler kullanıldı. Çürük gibi bir uyaran varlığında tamir dentini oluşumu sonucunda bağlantı dayanıklılığının tespitinde standardizasyon sağlanamaması sonuçları olumsuz etkileyecektir [14][15][16][17] .…”

Section: Gereç Ve Yöntemunclassified

Farkli Post-Kor Si̇stemleri̇ni̇n Kirilma Dayaniminin i̇n-Vi̇tro Olarak Değerlendi̇ri̇lmesi̇

EKREN¹

2016

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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ÖZAmaç: Bu çalışmanın amacı döküm Ni-Cr, fiber post ve kompozit kor ve preslenmiş lithiumdisilicate post-kor sistemlerinin kırılma dirençlerinin karşılaştırmalı değerlendirilmesidir. Gereç ve Yöntem: Toplanan maksiler anterior dişlere kanal tedavisi uygulandı. Kök uzunlukları 10 mm olacak şekilde standardize edildikten sonra kök kanallarına post yuvaları hazırlandı. Toplamda 30 adet diş tesadüfi olarak 3 gruba ayrıldı(n=10). Post yuvalarının ölçüsü patern rezin ile alındı ve laboratuara gönderildi. Laboratuar işlemleri sonrası Ni-Cr ve Li-disilikat örnekler hazırlandı. Hazırlanan post korlar ve fiber postlar duel-kür rezin siman ile post yuvalarına simante edildi. Test örnekleri oda ısısında 24 saat bekletildikten sonra 7 0 C-50 0 C arasında termal döngüye maruz bırakıldı. Termal döngü sonrası test örneklerine testometrik cihazında 1mm/dk hızla örnek kırılana kadar kuvvet uygulandı. SPSS programı kullanılarak Tek yönlü ANOVA ve Dunnett T3 testi(α=0.05) ile verilerin istatistiği yapıldı. Bulgular: Hazırlanan döküm Ni-Cr test örneklerinin kırılma direnci 334.2 ±130.5 N, fiber-post kompozit kor örneklerin kırılma direnci 280.2 ±62.5 N, li-disilikat örneklerin kırılma direnci ise 162.8 ±28.6 N bulunmuştur. Ni-Cr döküm alaşımı kullanılan test örnekleri en yüksek kırılma direncini gösterirken, lidisilikat grubundaki örnekler en düşük kırılma direncini göstermiştir. Ni-Cr ve fiber post kompozit kor test örnekleri arasında istatistiki olarak anlamlı fark bulunamamıştır Sonuç: Çalışmanın sınırları dahilinde, estetik avantajları yüksek olmasına rağmen post kor yapımında Li-disilikat kullanılması kırılma direncinin göreceli düşük olması nedeniyle risk taşımaktadır. Anahtar kelimeler: Post-kor, kırılma direnci, aşırı hasarlı dişler ABSTRACT Aim: The aim of this study was to evaluate and compare the fracture resistance of post-core systems made of cast Ni-Cr, fiber post and composite core and pressed li-disilicate post-core systems. Material and Methods: Root canal treatment was conducted on collected sound maxillary anterior teeth. After standardization of root length as 10 mm, post space was prepared. A total of 30 teeth were divided into 3 groups (n=10) randomly for Ni-Cr, lithiumdisilicate and fiber post-composite core. The impression of post space was taken with pattern resin. Following the laboratory procedures, Ni-Cr and lithiumdisilicate post-core were prepared. Fabricated post-cores and fiber posts were luted with duel-cure resin cement. After 24 hours test specimens were subjected to thermal cycling between 7 0 C and 50 0 C and were subjected to fracture test with a cross-head speed of 1mm/min. Data were subjected to one-way ANOVA followed by Dunnett T3 tests for statistical analyses (α=0.05) using SPSS 21. Results: The mean and standard deviation of maximum fracture force was 334.2 ±130.5 N for Cast Ni-Cr, 280.2 ±62.5 N for Fiber post and 162.8 ±28.6 N for Lithium-disilicate. Teeth which received Ni-Cr post cores had highest fracture resistance however lithiumdisilicate group had the least. There was no statistica...

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“…19 Each test method has its advantages and disadvantages, but a common limitation in most of them is the difficulty in determining the core/veneer bond strength from the applied load force at failure on the specimen in a specific test set-up. 1,13,18,[20][21][22][23][24] Testing the core/veneer bond strength in real tension is not often done, as fixing the test specimens of these brittle materials in the setup is challenging. 19 Dundar et al 25 compared the SBS and microtensile testing methodologies for core and veneering ceramics in four types of all-ceramic systems.…”

Section: Discussionmentioning

confidence: 99%

Bond Strength, Microhardness, and Core/Veneer Interface Quality of an All-Ceramic System

Fahmy

2010

Journal of Prosthodontics

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Purpose: This study was designed to evaluate three veneering materials for an allceramic alumina system in terms of bond strength, microhardness, and core/veneer interface quality. Materials and Methods: Fifteen In-Ceram cores were constructed for this study, forming three groups of five specimens each divided by the veneering ceramic disc fired on the occlusal surface of the alumina core: Vitadur N, Vitadur Alpha, or VM7. The specimens underwent shear bond and microhardness testing. Gross examination of debonded discs by SEM and EDAX analysis was conducted. Data for shear bond strength (SBS) and microhardness were presented as means and standard deviation (SD) values. One-way ANOVA and Duncan's post hoc test were used for pairwise comparison between the means when ANOVA test was significant. Results: VM7 showed the highest shear bond value and lowest microhardness values of the three tested veneering materials. No statistically significant difference was evident between the SBSs of Vitadur N and Vitadur Alpha to the alumina cores. Vitadur Alpha showed statistically the highest mean VHN, followed by Vitadur N, while VM7 showed statistically the lowest mean values of VHN. Conclusions: In-Ceram core/Vitadur N disc debondings appeared to be interfacial by complete delaminations, leaving a shiny visible and quite distinct area, whereas there appeared to be perfect adhesion between the core and VM7 veneering material. VM7 appeared to possess ultra-fine texture with intimate contact to the core, forming what seemed like a transition zone where the ceramic and core appeared to blend for a distance. VM7's finer particle size has improved the core/veneer bond strength and decreased micohardness values. This new veneering material will probably enhance the performance and esthetics of the In-Ceram system.Interest in all-ceramic restorations has evolved primarily in response to the esthetic limitations of metal-ceramic restorations. To achieve optimum esthetics, strong all-ceramic cores are veneered with a ceramic material, which is built in successive layers, giving the final restoration individual optical characteristics that can barely be distinguished from the surrounding natural dentition. Successful performance and reliability of these restorations may be limited by mechanical integrity and adhesion of the veneering porcelain to the ceramic substrate. The mechanical properties of the core and veneering porcelains should match to achieve a durable bond.2 The Cohesive Plateau theory states that the strength of a bonded interface should equal the cohesive strength of the substrate with which it is formed. 3 In addition, studies testing the porcelain-to-metal bond strength suggest that shear bond strength (SBS) equal to the shear strength of the veneering porcelain provided an adequate bond. In a study by Kelly et al 5 on the failure behavior of In-Ceram fixed partial dentures, it was reported that failure occurred in the connectors, none from contact damage, with approximately 70% to 78% originating from the cor...

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Resistance to Fracture of Three All‐Ceramic Systems

Cited by 58 publications

References 6 publications

Treating a Traumatised Maxillary Central Insizor With Monoblock Post-Core-Crown Restoration: A Case Report

Treating a Traumatised Maxillary Central Insizor With Monoblock Post-Core-Crown Restoration: A Case Report

Farkli Post-Kor Si̇stemleri̇ni̇n Kirilma Dayaniminin i̇n-Vi̇tro Olarak Değerlendi̇ri̇lmesi̇

Bond Strength, Microhardness, and Core/Veneer Interface Quality of an All-Ceramic System

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