Simulated clinical adjustment and intra-oral polishing of two translucent, monolithic zirconia dental ceramics: An in vitro investigation of surface roughness

Jum’ah, Ahmad A.; Brunton, Paul; Li, Kai Chun; Waddell, John Neil

doi:10.1016/j.jdent.2020.103447

Cited by 22 publications

(31 citation statements)

References 41 publications

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“…It is known, when the dopant concentration is high, the surface roughness is increased (meaning for 8Y-or 5Y-TZP was higher in comparison to 3Y-TZP) [ 43 , 44 ]; also, it causesan increase incubic phase amount and lowers the strength and fracture toughness, [ 1 , 6 ] and lowers the mechanical properties [ 45 ]. As a result, the surface treatment as glazing may or not have a protective role; polishing may induce defects and/or phase transformation which can lead to an increase or decrease in strength of the material [ 32 , 46 , 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics of High Translucent Multilayered Dental Zirconia Related to Aging

et al. 2022

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(1) Background: The purpose of this study was to evaluate the differences in terms of surface characteristics (roughness, topography, microhardness) among layers for multi-layered high translucent and super-high translucent zirconia and the influence of finishing and aging on surface characteristics and microstructure. (2) Methods: Three types of translucent multilayer zirconia were evaluated: STML (4Y-TZP); IPS e.maxZirCAD CEREC/in Lab MT Multi (4Y-TZP + 5Y-TZP); CeramillZolidfx ML (5Y-TZP). Ninety-six plate-shaped samples (32 for a material), 16mm x14mm x1mm size, were cut with a precision disc, polished on both sides with sand papers and sintered respecting the manufacturer’s protocol. Half of the specimens (16) were finished by polishing and the other half by glazing and then equally divided into one control group and one group subject to aging by autoclaving (1h, 134 °C, 0.2 MPa), resulting in four groups of eight samples, for each zirconia. The specimens were evaluated in three areas: cervical, medium, incisal-of each glazed or polished surface, before and after aging. Tests were performed to determine the surface roughness using a profilometer; the surface topography by an atomic force microscope (AFM) and a scanning electron microscope (SEM). Microhardness was recorded using a microhardness tester. Statistical analyses were performed using two-way ANOVA test, unpaired sample t-Test, paired sample t-Test (α = 0.05) and Pearson’s correlation. (3) Results: Before and after autoclaving, for glazed samples significance (p < 0.05) higher surface roughness, respectively lower microhardness in comparison with the polished group was assessed. No significant differences (p > 0.05) were reported between the three areas, on glazed or polished surfaces of a material. Although, after aging an increase in surface roughness was observed both on glazed and polished samples, statistical differences were found for STML (p < 0.05). No significant differences (p> 0.05) concerning microhardness among the same areas, on glazed and polished surfaces, recorded before and after aging, except CeramillZolidfx ML glazed samples. (4) Conclusions: For tested zirconia materials no significant differences among layers were registered regarding surface characteristics. Surface treatment (glazing or polishing) has a significant impact on surface roughness and microhardness. Both before and after aging, the surface roughness values for the glazed samples were higher than for those polished. The super translucent 4Y-TZP material was more affected by aging compared to the super-high translucent 5Y-TZP material. The combined material revealed similarities for each layer corresponding to the microstructure.

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Section: Introductionmentioning

confidence: 99%

Surface Characteristics of High Translucent Multilayered Dental Zirconia Related to Aging

et al. 2022

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“…Most of the irregularities were found in the lingual surfaces, which are the less likely areas to be adjusted by the dentist and suggest that the restorations might have been received with the flaws identified here, perhaps in the attempt to contour the restoration. The surface roughness of the "smooth area" of the examined replicas was much lower than the roughness of surfaces submitted to the four-step polishing procedures [22].…”

Section: Discussionmentioning

confidence: 69%

Laboratory Characterization of In-Service Full-Mouth Rehabilitation with Monolithic Translucent Zirconia Restorations

et al. 2021

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The chance to critically and microscopically inspect the quality of bonded restorations once they are delivered to the patient after several pre-cementation steps is rare or nonexistent. Replicas of in-service restorations can provide a wealth of information on the integrity of the restorations and moreover make it possible to bring this information to the laboratory for further detailed analysis. This study aimed to characterize the epoxy replicas of 27 cemented monolithic yttria-stabilized zirconia crowns of the maxillary and mandibular arch to assess surface roughness, topography, and symmetry. The topography of the facial, lingual, and occlusal/incisal surfaces of each crown was observed under the optical microscope and further characterized using the scanning electron microscope. Surface roughness measurements were performed using the atomic force microscope. The optical microscope was used to measure the golden proportion and visible width of the anterior maxillary crowns. Surface damage consistent with unpolished adjustment was identified mostly in the occlusal surface of the posterior teeth. Other irregularities, such as scratch marks, small pits, and coarse pits were also found. The surface roughness had great variability. Not all of the anterior maxillary and mandibular teeth followed the golden proportion concept. This study design allows in vitro characterization of in-service restorations. It provides a framework for using replicas for early identification of patterns or features that can trigger fracture and for analysis of morphology and symmetry.

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“…Geçmişte yapılan bazı çalışmaların sonuçlarından farklı olarak [9][10][11][12] , yapılan çalışmada sırlanmış yüzeyler kontrol yüzeylerine göre daha pürüzlü bir yüzey oluşturmuştur. Ancak Chun ve ark.…”

Section: Discussionunclassified

“…8 Monolitik zirkonya materyallere uygulanan ekstraoral bitirme işlemlerinin yüzey pürüzlülüğüne etkisini araştıran az sayıda çalışma bulunmaktadır. [9][10][11][12] Bu çalışmanın amacı, farklı translüsense sahip monolitik zirkonya materyallerine uygulanan sırlama ve farklı ekstraoral bitirme işlemlerinin yüzey pürüzlülüğü üzerine etkisinin optik profilometre ile değerlendirilmesi ve karşılaştırılmasıdır. Çalışmanın sıfır hipotezi, farklı translüsensiye sahip monolitik zirkonya materyallerine uygulanan ekstraoral parlatma işlemlerinin yüzey pürüzlülükleri üzerinde etkisinin olmamasıdır.…”

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Ekstraoral Parlatma İşlemlerinin Translüsent Monolitik Zirkonyanın Yüzey Pürüzlülüğüne Etkisi

ERTUĞRUL¹,

Yıldırım²,

Yüzügüllü³

2022

ADO Klinik Bilimler Dergisi

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Bu çalışmanın amacı, farklı translüsenste monolitik zirkonya materyallerine uygulanan ekstraoral bitirme işlemlerinin yüzey pürüzlülüğü üzerine etkisinin incelenmesidir. Gereç ve Yöntem: Süper yüksek translüsent (n=40), yüksek translüsent (n=40) ve yüksek yarı translüsent (n=40) yarı sinterize monolitik zirkonya bloklar kesilerek, 1.5x20x20 (±0.3-0.5) mm boyutlarında örnekler hazırlanmıştır. Her gruptan 4'er örnek taramalı elektron mikroskobu ile topografik değerlendirme için ayrıldıktan sonra, kalan örnek grupları da kendi içinde kontrol (K), sırlanmış (G), polisaj (P), polisaj+polisaj patı (PP) olarak ayrılmış ve yüzey pürüzlülükleri optik profilometre ile ölçülmüştür. İstatistiksel analizde iki yönlü karma ANOVA, Bonferroni düzeltmeli Post-hoc çoklu karşılaştırma testleri uygulanmıştır. Bulgular: Üç farklı zirkonya materyal grubu ve 3 farklı yüzey uygulamasının pürüzlülük üzerindeki etkisi istatistiksel olarak anlamlı bulunmuştur (p<0.05). Grup içi karşılaştırmalar değerlendirildiğinde, Grup G en yüksek pürüzlülük değerlerine sahipken (p<0.05), Grup PP ise en düşük değerlere sahiptir (p<0.05). Yalnızca Cube ONE ile CubeX² gruplarının sırlanmış örnekleri arasında istatistiksel olarak anlamlı fark bulunmuştur (p=0.008). TEM fotoğraflarında farklı içerikte zirkonya materyallerde ve farklı ekstraoral işlem grupları arasında yüzey topografisi değişkenlik göstermiştir. Sonuç: Bu in vitro çalışmanın sınırlamaları dahilinde, tüm translüsent monolitik zirkonya gruplarında, polisaj+polisaj patı uygulaması yapılan örnekler en düşük yüzey pürüzlülüğüne sahiptir.Ekstraoral bitirme işlemi gerektiren durumlarda, translüsent monolitik zirkonya restorasyon yüzeylerinin sırlama yerine polisajlama yöntemleri uygulanarak bitirilmesi önerilebilir.

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Simulated clinical adjustment and intra-oral polishing of two translucent, monolithic zirconia dental ceramics: An in vitro investigation of surface roughness

Cited by 22 publications

References 41 publications

Surface Characteristics of High Translucent Multilayered Dental Zirconia Related to Aging

Surface Characteristics of High Translucent Multilayered Dental Zirconia Related to Aging

Laboratory Characterization of In-Service Full-Mouth Rehabilitation with Monolithic Translucent Zirconia Restorations

Ekstraoral Parlatma İşlemlerinin Translüsent Monolitik Zirkonyanın Yüzey Pürüzlülüğüne Etkisi

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