Objective: Zirconia implants are assumed to satisfy the esthetic requirements that titanium implants cannot meet, however, there are not enough studies in the literature about narrow-diameter and angled zirconia implants that can be preferred especially in the anterior region. This in vitro study aimed to evaluate the fatigue resistance and fracture strength of narrow-diameter zirconia implants with angled abutments. Materials and Methods: Forty-eight one-piece experimental zirconia implants and monolithic zirconia crowns were produced from 3-YTZP blanks. The implant diameters (3.0 or 3.7 mm) and the restoration types were determined according to three intraoral regions (upper central incisors, lower central incisors, and upper canine), and abutments were designed as straight or 15 angled. The samples were subjected to chewing simulation corresponding to 5 years of clinical performance and then the static loading test. The survival rates of groups were measured by the Kaplan-Meier log-rank test, and the fracture load values were estimated by using Kruskal-Wallis and Mann-Whitney U tests (p < 0.05).Results: All 3.0 mm diameter implants failed the fatigue test. The fatigue resistance of the implants with angled abutments was significantly lower than the straight abutments, and different crown designs were found to affect survival rates significantly. The fracture strengths of the surviving groups were above the maximum physiological chewing forces, and the differences were not significant. Conclusions:The implant diameter, abutment angle, and restoration type have a significant effect on the fatigue behavior of zirconia implants.Clinical Significance: The fracture strengths of the one-piece zirconia implants with a 3.7 mm diameter and a 15 abutment angle are above the chewing forces for the anterior intraoral region.
Ö ÖZ ZE ET T A Am ma aç ç: : Metal destekli porselen restorasyonlar sahip oldukları üstün mekanik özellikler gibi avantajları ile yaygın olarak kullanılan tedavi seçenekleridir. Farklı yöntemlerle elde edilen Co-Cr alaşımlarının metal-porselen bağlanma dayanımlarını, iki farklı test metodu kullanarak değerlendirmektir. G Ge er re eç ç v ve e Y Yö ön nt te em ml le er r: : Bu çalışmada, Co-Cr alaşım örnekler selektif lazer sinterleme (n=20) ve geleneksel döküm yöntemi (n=20) kullanılarak hazırlandı ve 4 alt grup (n=10) oluşturuldu. Geleneksel döküm ve selektif lazer sinterleme ile elde edilen örneklere üç nokta bükme testi için, ISO 9693'e göre toplam 1,1 mm kalınlığında olacak şekilde porselen tabakası uygulandı. Makaslama bağlanma dayanımı testi için ise örneklere 4 mm çapında ve 4 mm kalınlığında porselen tabaka uygulandı. Örneklere, universal test cihazı kullanılarak 1,5 mm/dk hız ve 90 o açı ile üç nokta bükme testi ve 0,5 mm/dk hızla makaslama bağlanma dayanımı testi uygulanarak, metal-porselen bağlanma dayanımları ölçüldü. Elde edilen veriler tek yönlü varyans analizi kullanılarak p<0,05 anlamlılık düzeyinde değerlendirildi. B Bu ul lg gu ul la ar r: : Farklı yöntemlerle elde edilen metal alaşımlarının metal-porselen bağlantısının üç nokta bükme testi ile değerlendirilmesi sonucu elde edilen değerler arasında istatistiksel olarak anlamlı bir fark bulunamamıştır. Selektif lazer sinterleme yöntemiyle elde edilen alaşımların metal-porselen makaslama bağlanma dayanımlarının, geleneksel döküm yöntemiyle hazırlanan alaşımlara göre anlamı derecede daha yüksek olduğu saptanmıştır. S So on nu uç ç: : Üç nokta bükme testi sonuçlarına göre, grupların metal-porselen bağlanım dayanımları arasında anlamlı bir fark bulunamamıştır ve bu değerler ISO 9693'e göre minimum kabul edilebilir sınırın üzerindedir. Selektif lazer sinterleme yöntemiyle hazırlanan örneklerin metal-porselen makaslama bağlanım dayanımları, geleneksel döküm yöntemiyle hazırlanan alaşımlara göre daha yüksek bulunmuştur.A An na ah ht ta ar r K Ke el li im me el le er r: : Dental porselen; metal-seramik alaşımlar; selektif lazer sinterleme A AB BS ST TR RA AC CT T O Ob bj je ec ct ti iv ve e: : Metal-supported porcelain restorations are widely used as a treatment options due to it's advantages such as superior mechanical properties. The aim of this study was to evaluate the metal-porcelain bond strengths of Co-Cr alloys obtained by different methods using two different testing methods. M Ma at te er ri ia al l a an nd d M Me et th ho od ds s: : In this study, Co-Cr alloy specimens were prepared using with selective laser sintering (n=20) and conventional casting (n=20) and specimens were divided 4 subgroups (n=10). For the three-point bending test, porcelain layer were applied to samples according to ISO 9693 with a total thickness of 1.1 mm. For shear bond strength test, porcelain layer 4 mm in diameter and 4 mm in thickness was applied to the specimens. The metal-porcelain bond strengths were measured by a universal testing machine using three-p oint-ben...
The aim of this study, was to compare the water sorption and solubility of two traditional glass ionomer cements (GIC) and one resin-modified glass ionomer cement (RM GIC) material. The traditional GIC dental materials which were Ceram Fil (PSP Dental, England) and Ionofil (Voco GmbH, Germany) and the RM GIC dental material which was Rely-X (3M Dental Products, St Paul, USA) were used in study. All specimens were prepared according to the manufacturer's instructions and then subjected to water sorption and solubility tests based on the ISO 4049 and ADA No.8 requirements. In the study, weight changes of specimens of three materials were determinated after water immersion for 1 and 7 days and the results were compared. Values were analyzed with two-way ANOVA and Duncan's test at a 0.01 significance level. Results showed that, the Rely-X specimens had significantly less water sorption and solubility values than other two traditional GIC specimens after water immersion for 7 days and the Ionofil specimens had most water sorption and solubility values than specimens of other two materials after water immersion for 7 days. There were not significantly differences statistically between specimens of three materials after water immersion for one day.Key Words: Acid-base reaction, resin-modified glass ionomer cements, polyacid-modified composite resins, composite resins, dental materials, water sorption, water solubility. ÖZET Bu çal›şman›n amac›, iki geleneksel cam iyonomer siman (CİS) ve bir rezin-modifiye cam iyonomer siman›n (RM CİS)
* Bu çalışma, 21. BaSS kongresi' nde sözlü sunum olarak kabul edilmiş ve sunulmuştur.
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