This study determined the reduction threshold in thickness of the dentin shade composite necessary to result in perceptible and acceptable color changes on simulated restorations. Three composite systems (Charisma Diamond, IPS Empress Direct, and Filtek Z350 XT) were evaluated using cylinder-shaped specimens built-up with dentin and enamel shades. The opacity of the composites was assessed using 1.0 mm thick specimens over black and white backgrounds. A baseline color was established for each system by combining 1.0 mm thick enamel shade with 3.0 mm of dentin shade cylinders over a dark background (n = 9). Then, the color changes (∆E 00 ) caused by sequential 0.1 mm reductions on dentin shade cylinders were calculated. Opacity changes on dentin shade cylinders and combined enamel-dentin pair cylinders were also assessed after each thickness reduction. Polynomial regression was performed with averages of ∆E 00 as a function of thickness of dentin shade cylinders; and acceptability (∆E = 1.77) and perceptibility (∆E = 0.81) thresholds were calculated. Linear regressions were also performed for ∆E 00 as function of opacity of dentin shade cylinders and combined enamel-dentin pair of cylinders. Except for Charisma, enamel shades presented the lowest opacity than dentin one. Perceptible and acceptable color changes were observed for dentin shade cylinders thinner than 2.0-2.4 mm and 1.1-1.4 mm, respectively, were used. No difference among the composite systems was observed. In conclusion, reductions on dentin shade composite lower than 0.6-mm did not yield perceptible color changes, and clinically significant color changes only were observed within reductions higher than 1.6-mm.
The present study aimed to perform an epidemiological survey on the prevalence rate of oral lesions diagnosed in a referral center in Brazil and to establish association between the lesions and the age and gender of the affected patients. This analytical observational study analyzed 3521 medical records of anatomopathological exams of the Pathological Anatomy and Cytopathology Laboratory of the Cancer Hospital of the state of Mato Grosso (Brazil), from December 2011 to September 2015. A total of 1550 relevant medical records was detected. Patients aging between 41 and 60 consisted of 42.84% of the sample. Males were more affected than females (60.13%). Inflammatory processess consisted of the most prevalent diagnosis (43.29%), followed by squamous cell carcinoma (6.06%), and periapical granuloma (5.23%). Oral health public policies must give major attention to Brazilian males aged between the fourth and sixth decades of life in order to improve their quality of life.
A procura por tratamentos estéticos vem acontecendo cada vez mais precoce, o que de certa forma contribui para o surgimento e aprimoramento de novas técnicas, já que a procura não é apenas para atenuar os efeitos do envelhecimento, mas também para preveni-los. Os fios faciais e corporais podem ser indicados para tratar fotoenvelhecimento, assimetria facial, rugas finas e grossas, sulcos, ptoses leves a moderadas da face, do pescoço e áreas de todo o corpo. O procedimento guiado por ultrassonografia (PGUS) é um conceito de localização anatômica, em tempo real, para procedimentos que demandam uma precisa visualização de estruturas nobres, como também, grânulos causados pelo uso do polimetilmetacrilato (PMMA), material muito usado durante décadas em procedimentos estéticos e que pode ser o agente causal de várias complicações, frente as modernas técnicas da Harmonização Facial (HF). Dessa forma, as intercorrências relacionadas a inserção adequada dos fios, acabam sendo quase que totalmente evitadas com PGUS, dando maior segurança para a realização desses procedimentos. Assim, este artigo busca evidenciar a importância da ultrassonografia (US) para a HF e demonstrar sua notoriedade como método de diagnóstico e auxiliar em procedimentos realizados pela HF.
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