Effect of finish line variants on marginal accuracy and fracture strength of ceramic optimized polymer/fiber-reinforced composite crowns

Cho, Lee‐Ra; Choi, JongMi; Yi, Yang Jin; Park, Chan-Jin

doi:10.1016/j.prosdent.2004.03.004

Cited by 61 publications

(53 citation statements)

References 16 publications

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“…21 Although the feather-edge type of finish line exhibited the least AMO and MO values, it is not highly recommended for clinical practice, since it triggers a wedging effect at the margins and may provide additional marginal bulk. 22 Although the practical feather-edge type of finish line cannot be recommended, especially for all-ceramic constructions, it was interesting to note that ceramic thickness at the margins did not affect the results. Therefore, the hypothesis was rejected.…”

Section: Discussionmentioning

confidence: 99%

Influence of Cervical Finish Line Type on the Marginal Adaptation of Zirconia Ceramic Crowns

Çömlekoğlu¹,

Dündar²,

Özcan³

et al. 2009

Operative Dentistry

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Cervical finish line type has an influence on the marginal adaptation of Y-TZP restorations. Both shoulder and mini-chamfer exhibited the least marginal opening values for zirconia crowns and can be recommended for clinical applications. SUMMARYThe current study evaluated the effect of different cervical finish line designs on the marginal adaptation of a zirconia ceramic. Four different marginal finish lines (c: chamfer, mc: mini-chamfer, fe: feather-edge and s: rounded shoulder) were prepared on phantom incisors. Die models for each preparation group (N=28, n=7 per finish line design group) were made of epoxy resin. Y-TZP (ICE Zirkon) frameworks were manufactured by a copy-milling system (Zirconzahn) using prefabricated blanks and tried on the master models for initial adaptation of the framework; they were then sintered, followed by veneering (Zirconzahn). The finished crowns were cemented with a polycarboxylate cement (Poly F) under 300 g load and ultrasonically cleaned. The specimens were sliced and the marginal gap was measured, considering absolute marginal opening (AMO) and marginal opening (MO) for each coping under a stereomicroscope with image processing software (Lucia). The measurements were statistically analyzed using the Kruskal Wallis, Mann Whitney and Wilcoxon Signed Ranks tests at a significance level of α α=0.01. Means of AMO measurement (µm) for the feather-edge finish line (87 ± 10) was significantly lower than that of the chamfer (144 ± 14), shoulder (114 ± 16) and mini-chamfer finish line types (114 ± 11) (p<0.01). Means of MO measurements was the lowest for feather-edge finish line (68 ± 9) (p<0.01) and then, in ascending order, shoulder (95 ± 9), mini-chamfer (97 ± 12) and chamfer (128 ± 10). The cervical finish line type

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Section: Discussionmentioning

confidence: 99%

Influence of Cervical Finish Line Type on the Marginal Adaptation of Zirconia Ceramic Crowns

Çömlekoğlu¹,

Dündar²,

Özcan³

et al. 2009

Operative Dentistry

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“…Clinical studies have shown a mean marginal gap of 65 μm for fixed partial dentures (FPD) fabricated using the Lava system (3M ESPE, Seefeld, Germany), which carries out milling in a semi-sintered state 22) . On the marginal fit of restorations, numerous in vitro studies have been carried out using toothcolored materials fabricated with different preparation angles between 6 and 15 degrees 9,[24][25][26] . In a study 26) that compared the marginal fit and fracture strength of different preparation angles, it was found that decreasing the convergence angle of single crowns reduced the marginal gap and increased the mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

“…On the marginal fit of restorations, numerous in vitro studies have been carried out using toothcolored materials fabricated with different preparation angles between 6 and 15 degrees 9,[24][25][26] . In a study 26) that compared the marginal fit and fracture strength of different preparation angles, it was found that decreasing the convergence angle of single crowns reduced the marginal gap and increased the mechanical stability. However, the study 26) was conducted using fiber-reinforced composite crowns, making comparison to zirconiabased restorations questionable.…”

Section: Introductionmentioning

confidence: 99%

Effect of preparation angles on the precision of zirconia crown copings fabricated by CAD/CAM system

et al. 2008

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The aim of this in vitro study was to evaluate the effects of different preparation angles on the precision of fit of zirconia crown frameworks. Dies were fabricated with three different preparation angles: 4, 8, and 12 degrees total taper. Ten copings were fabricated for each angle by a laboratory and a milling-center CAD/CAM system. After cementation, cross-sections were obtained and cement gaps were measured. Preparation angle (ANOVA, p<0.01) and measurement location (ANOVA, p<0.01) exhibited statistically significant influence on the precision of fit. On the other hand, no statistically significant influences were detected between copings prepared using the laboratory and milling-center CAD/CAM systems (ANOVA, p=0.92). All groups showed marginal openings ranging between 36.6 and 45.5 μm. In light of the results obtained in this study, a preparation angle of 12 degrees is hence recommended with the confidence that the marginal gap will be consistently less than 50 μm.

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“…Siman aralığı, tamamen dizayn programları üzerinden ayarlandığından ilave bir die spacer uygulanmasına gerek kalmamış, bu şekilde uygulayıcıya bağlı olarak oluşabilecek farklılıkların önüne geçilmiştir. Metal-seramik restorasyonların simantasyonları geleneksel yöntemlerle yapılabildiği gibi, 30 kırılma direncini artırabilmek için adeziv sistemlerle simantasyon önerilmektedir. 31 Kompozit rezin simanlar oksijen varlığında polimerize olamazlar.…”

Section: Tartiġmaunclassified

Deği̇şi̇k Yöntemlerle Hazirlanan Metal Alt Yapilar Üzeri̇ndeki̇ Veneer Porselenleri̇ni̇n Kirilma Di̇renci̇ne Farkli Kenar Bi̇ti̇m Şeki̇lleri̇ni̇n Etki̇si̇ni̇n İncelenmesi̇≠

Alkurt¹,

Duymuş²

2016

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Bu çalışmada, değişik yöntemlerle hazırlanan metal alt yapılar üzerindeki veneer porselenlerinin kırılma direncine farklı kenar bitim şekillerinin etkisi in vitro olarak incelenmiştir. Materyal ve Metod: Örneklerin elde edileceği kesilmiş üst 1. küçük azı dişini temsil eden güdükler; 1. Güdük; 6 mm kuron boyu ve 6° taper açısında 1 mm shoulder basamak, 2. Güdük; 6 mm kuron boyu ve 6° taper açısında 1 mm chamfer basamak ile standardizasyonun sağlanması amacıyla CNC torna tezgahında hazırlanmıştır. Güdüklerden alınan ölçülerden 30 adet epoksi rezin güdük elde edilmiştir. Metal alt yapılar farklı yöntemlerle hazırlandıktan sonra üst yapı porseleni uygulanarak kuronlar tamamlanmıştır. Kuronlar epoksi rezin güdükler üzerine simante edildikten sonra veneer porselenlerinin kırılma dirençleri Universal test cihazında ölçülmüştür. Veriler iki yönlü varyans analizi (ANOVA) ile değerlendirilmiş, çoklu karşılaştırma ve ttesti uygulanmıştır. Bulgular: Varyans analizi sonucunda; kırılma direnci değerlerine basamak şekli ve hazırlama yöntemlerinin etkisinin anlamlı olduğu istatistiksel olarak tespit edilmiştir (p<0.05). Sonuç: En yüksek veneer porselen kırılma direnci değerlerinin döküm yöntemiyle hazırlanan chamfer bitim hatlı kuronlarda olduğu görülmüştür.

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Effect of finish line variants on marginal accuracy and fracture strength of ceramic optimized polymer/fiber-reinforced composite crowns

Cited by 61 publications

References 16 publications

Influence of Cervical Finish Line Type on the Marginal Adaptation of Zirconia Ceramic Crowns

Influence of Cervical Finish Line Type on the Marginal Adaptation of Zirconia Ceramic Crowns

Effect of preparation angles on the precision of zirconia crown copings fabricated by CAD/CAM system

Deği̇şi̇k Yöntemlerle Hazirlanan Metal Alt Yapilar Üzeri̇ndeki̇ Veneer Porselenleri̇ni̇n Kirilma Di̇renci̇ne Farkli Kenar Bi̇ti̇m Şeki̇lleri̇ni̇n Etki̇si̇ni̇n İncelenmesi̇≠

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