In the case of high-translucency laminates, luting agents with different activation methods might be used. However, even in thin sections, decreasing the translucency of the laminate led to significant loss of light penetration, indicating a decreased likelihood of the physical activation of the resin cement.

Aim: The aim of this study was to evaluate the influence of the translucency of ceramic on water sorption and solubility of resin cements over time. Methods: Lithium disilicate ceramic slides (15x15x1 mm), A1 in color and with different translucencies (high-medium-low) were manufactured; and a glass slide with similar dimension was used as control. Under every slide, 15 specimens (8x0.5 mm) from each resin cement were prepared: light-cured (RelyX Veneer); conventional dual-cured (RelyX ARC); and self-adhesive dual-cured (Rely-X U200). The specimens were then sub-divided according to the period of evaluation (immediately, after 6 and 12 months of storage) (n=5). To evaluate the loss or gain of mass, the specimens were dried until a constant mass was reached. Subsequently, they were divided according to the respective period of storage at 37°C in distilled water and weighed immediately following removal from water. After each period, specimens underwent a new dehydration. Values from water sorption and solubility were calculated and statistically analyzed (Anova 3-way/Tukey test). Results: The lower translucency resulted in greater water sorption and solubility for all cements, regardless of the experimental period. The self-adhesive dual-cured cement showed higher water sorption under all experimental periods and had worse values after 1 year aging. Differences among solubility could only be detected after aging, and the light-cured material had higher values after 6 and 12 months. Conclusions: It could be concluded that the low degree of translucency can negatively influence the passage of light and interfere on the durability of the resin cement. The conventional dual-cured resinous agent seemed to be less affected by such condition.

<strong>Introdução</strong>: a prevalência de doenças endócrino-metabólicas, como, por exemplo, o hiperparatireoidismo, tem crescido com a melhoria da expectativa de vida da população e pode levar a alterações no sistema estomatognático. <strong>Objetivo<em>: </em></strong>relatar um caso clínico de um paciente com diagnóstico de tumor marrom associado ao hiperparatireoidismo. <strong>Metodologia<em>: </em></strong>a metodologia adotada neste artigo foi o relato de caso, através da revisão de prontuário de um paciente atendido no ambulatório da disciplina de Estomatologia II na Faculdade de Odontologia da Universidade Federal da Bahia. <strong>Resultados<em>: </em></strong>Clinicamente, observou-se um aumento de volume da hemiface esquerda  e, radiograficamente, pôde-se observar imagem radiopaca envolvendo processo alveolar e seio maxilar esquerdo. Além disso, os exames laboratoriais mostraram elevados níveis do hormônio paratireoidiano. <strong>Conclusão<em>: </em></strong>as características clínicas, radiológicas e histológicas das lesões de tumor marrom devem ser analisadas junto à condição sistêmica do indivíduo, a fim de propiciar correto diagnóstico e intervenção precisa