Objective While the radiopacity of restorative material affects the radiographic diagnosis of the teeth, there is no data about the radiopacity of current restorative computer‐aided design (CAD)/computer‐aided manufacturing (CAM) materials. Therefore, the present study compared the radiopacity values of current restorative CAD/CAM blocks to facilitate the material choice within such a wide variety of materials. Materials and Methods Specimens were prepared from 13 different restorative CAD/CAM blocks to compare with enamel and dentin. The specimens placed on the occlusal phosphor plate were imaged with aluminum step wedge and tooth section. The radiopacity values were calculated using the Image J program. The radiopacity values of the specimens were converted to mmAl values with the Curve Expert 1.4 program. Results The difference between the radiopacity values of dentin and e.max CAD was not significant, however, they exhibited a significant difference from the other 14 groups (P < .05). Enamel and Obsidien, Suprinity, and Celtra Duo had greater radiopacity values with significant differences from the other 12 materials whereas the difference within these groups was not significant (P > .05). Conclusions The evaluated restorative CAD/CAM materials have significantly different radiopacity values. Among these permanent restoration blocks, the highest radiopacity value was observed in Celtra Duo, the lowest in Block HC. Clinical Significance Cerasmart, Lava Ultimate, Obsidian, Vita Suprinity, Celtra Duo Blocks have adequate radiopacity for inlay, onlay and crown restorations, however, the use of Vita Enamic, Vita Mark II, GC LRF blocks and the others which have lower radiopacity value than dentin for the same kind of restorations depend on the radiopacity of the luting cement for the purpose of recurrent caries detection.
Background Present study compared the failure load of CAD/CAM-manufactured implant-supported crowns and the stress distribution on the prosthesis-implant-bone complex with different restoration techniques. Methods The materials were divided into four groups: group L-M: lithium disilicate ceramic (LDS, monolithic), group L-V: LDS ceramic (veneering), group ZL-M: zirconia-reinforced lithium silicate ceramic (ZLS, monolithic), group ZL-V: ZLS ceramic (veneering). Crown restorations were subjected to load-to-failure test (0.5 mm/min). Failure loads of each group were statistically analyzed (two-way ANOVA, post hoc Tukey HSD, α = 0.05). Finite element analysis (FEA) was used to compare the stress distribution of crown restorations. Results Group L-M had the highest failure load (2891.88 ± 410.12 N) with a significant difference from other groups (p < 0.05). Although there was a significant difference between group ZL-M (1750.28 ± 314.96 N) and ZL-V (2202.55 ± 503.14 N), there was no significant difference from group L-V in both groups (2077.37 ± 356.59 N) (p > 0.05). Conclusions The veneer application had opposite effects on ceramics, increased the failure load of ZLS and reduced it for LDS without a statistically significant difference. Both materials are suitable for implant-supported crowns. Different restorative materials did not influence the stress distribution, but monolithic restorations reduced the stress concentration on the implant and bone.
Diş hekimlerinin COVID-19 salgını sırasında enfekte olma riski yüksektir. Bu kesitsel çalışma, diş hekimliği öğrencilerinin COVID-19 pandemisi ile ilgili kaygı ve bilgi düzeylerini, online eğitime dair görüşlerini ve kariyer seçimi sebebiyle pişmanlık oranlarını değerlendirmeyi amaçlamaktadır.Yöntemler: Google docs üzerinde online bir anket oluşturulmuş ve diş hekimliği öğrencileri ile paylaşılmıştır. Anket, COVID-19 hakkında bilgi, pandemi kaygısı ve online eğitim geri bildirimleri olmak üzere üç bölüme ayrılmıştır. Bilgi ve kaygı düzeyleri arasındaki ilişkiyi incelemek için Mann-Whitney U Testi ve Spearman Rho Korelasyon Analizleri kullanılmıştır.Bulgular: Preklinik grubunun bilgi düzeyi klinik grubuna göre istatistiksel olarak anlamlı derecede düşüktür (P = ,000; P < ,05). Bilgi düzeyi arttıkça, kaygı düzeyi azalmıştır (r = -0,116, P = ,007). Öğrencilerin %27,7'si diş hekimliği seçiminden pişmanlık duymaktadır ve kaygı puanları pişmanlık duymayanlara göre istatistiksel olarak anlamlı derecede yüksek bulunmuştur (P = ,000; P < ,05).Sonuç: Diş hekimliği öğrencilerinin COVID-19 hakkındaki bilgileri kabul edilebilir düzeydedir. Öğrencilerin daha bilinçli ve özgüven sahibi olmalarını sağlamak için, kaygı düzeylerinin ve pişmanlık oranlarının azaltılmasına yönelik COVID-19 enfeksiyonu hakkında eğitim verilmelidir. Eğitim politikaları, öğrencilerin beklenti ve taleplerini dikkate alarak belirlenmelidir.
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