António Duarte Sola Pereira da Mata

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This study investigated the effects of diabetes mellitus (types I and II) on human salivary gland function compared to healthy age-matched controls. The results have shown that both type I and type II diabetic patients secrete significantly (p < 0.05) less resting and stimulated saliva compared to healthy age-matched controls (AMC). It was also found that(More)
INTRODUCTION Apical constriction has been proposed as the most appropriate apical limit for the endodontic working length. Despite being the most used, some limitations are attributed to the radiographic method of working length determination. It lacks precision because it is based on the average position of the apical constriction. The electronic apex(More)
This study investigates the effect of perturbation of extracellular magnesium [Mg2+]o on basal and acetylcholine (ACh), noradrenaline (NA) and phenylephrine (PHE)-evoked amylase secretion from isolated rat parotid gland segments. Both zero (0 mM) and elevated (5 mM and 10 mM) [Mg2+]o can significantly (P < 0.05) inhibit basal and secretagogue-evoked amylase(More)
The objective of this study is to compare salivary hydrogen peroxide (HP) release kinetics and potential toxicity of systemic exposure of four different whitening products. A double-blind, randomized controlled trial was conducted in a Portuguese dental faculty clinic. Two hundred forty volunteers were randomized to eight intervention groups. Participants(More)
PURPOSE This study compared the microtensile bond strengths (μTBS) of two etch-and-rinse (ER) (OptiBond FL [OBFL]; Prime & Bond NT [PBNT]) and three self-etching (SE) (Clearfil SE Bond [CSEB]; Xeno III [XIII]; Xeno V+ [XV+]) adhesives systems to bur-prepared human enamel considering active (AA) and passive (PA) application of the self-etching systems. (More)
INTRODUCTION The anatomy of the maxillary C-shaped molar has been the subject of several case reports although no true prevalence research has ever been conducted. The aim of this observational study was to evaluate and characterize the incidence of these morphologies using cone-beam computed tomographic (CBCT) technology. METHODS Patients having(More)
OBJECTIVE The purpose of this study was to evaluate the prevalence of first and second C-shaped mandibular molars in a Western European population of Portuguese Caucasians. MATERIALS AND METHODS Patients having both routine panoramic radiograph and presurgical cone-beam computed tomography (CBCT) exams were selected. The CBCT examination was performed at(More)
The parotid glands are highly active secretory systems subjected to continuous stress, which in turn, can lead to several pathophysiological conditions. Damage of the parotid glands are caused by radical oxygen species (ROS) as by-products of oxygen metabolism. This study investigated the effect of hydrogen peroxide (H2O2) on Carbachol (CCh)-evoked(More)
This study investigated the effects of extracellular Mg2+ ([Mg2+]o) on basal and acetylcholine (ACh)-evoked amylase secretion and intracellular free Ca2+ ([Ca2+]i) in rat parotid acinar cells. In a medium containing 1.1 mM [Mg2+]o, ACh evoked significant increases in amylase secretion and [Ca2+]i. Either low (0 mM) or elevated (5 and 10 mM) [Mg2+]o(More)