Xerostomia and hyposalivation in patients with obstructive sleep apnoea.

Objective: (a) To report the xerostomia prevalence and severity in patients with obstructive sleep apnoea (OSA). (b) To assess the saliva pH in patients with OSA.

Design: Simultaneous cohort observational clinical study.

Comparative assessment of various composite materials and natural tooth tissue translucencies.

Objectives: The aim of this study was to compare the translucency levels of various composite materials that are positioned by their manufacturers as 'dentin,' 'opaque,' 'body,' and 'enamel' in relation to natural tooth tissues.

Methods: Sixteen commercial composite materials and 10 natural tooth tissue samples (enamel and dentin) were studied. The differences in color of dried and hydrated samples were measured on a black-and-white background using CIELab coordinates.