Although offering superior resistance to corrosion, titanium is unable to withstand discoloration with exposure to peroxide or fluoride. The mechanism of this discoloration, however, remains to be clarified. The purpose of this study was to investigate the mechanism underlying discoloration of titanium with immersion in peroxide- or fluoride-containing solutions based on electrochemical quartz ...

AIM The focus of this study was to examine the staining potential of calcium hydroxide (Ca(OH)2) on tooth structure following the removal of AH26 root canal sealer. METHODS AND MATERIALS Fifty maxillary anterior teeth were prepared and obturated with AH26 and gutta percha. The sealers were then removed 24 hours later and the teeth were randomly divided into two groups. Ca(OH)2 was then placed...

global health research is essentially a normative undertaking: we use it to propose policies that ought to be implemented. to arrive at a normative conclusion in a logical way requires at least one normative premise, one that cannot be derived from empirical evidence alone. but there is no widely accepted normative premise for global health, and the actors with the power to set policies may use...

The differential diagnosis of bluish-gray pigmentation of the skin includes dermal melanocytosis, malignant melanoma and metallic discoloration. Of these disorders, metallic discoloration, which develops from deposits of fine metallic particles on the skin, is an uncommon dermatologic disease. We report a case of metallic discoloration of the right shin caused by titanium alloy prostheses in a ...

The objective of this study was to compare corrosion behavior in several titanium alloys with immersion in acidulated saline solutions containing hydrogen peroxide. Seven types of titanium alloy were immersed in saline solutions with varying levels of pH and hydrogen peroxide content, and resulting differences in color and release of metallic elements determined in each alloy. Some alloys were ...

BACKGROUND Aesthetic problems in adolescence can have a significant effect on their psychosocial development. Abnormalities in tooth color can lead to such problem especially if it affects anterior teeth. OBJECTIVE This study therefore assessed the effects of anterior tooth discoloration on the psychosocial well-being of adolescents with a view to providing information that will aid the preve...

A 54-YR-OLD woman with intractable leg pain secondary to lumbar stenosis elected to undergo L4–L5 decompressive laminectomy. General anesthesia was induced with fentanyl, lidocaine, and propofol (200 mg) and maintained with isoflurane and nitrous oxide. Tracheal intubation was facilitated with succinylcholine, and neuromuscular blockade was maintained with vecuronium. Within the first hour of t...

STATEMENT OF PROBLEM Flexural strength, hardness, surface roughness, discoloration, and abrasion resistance are important properties of veneering composite resins. Recently introduced veneering resins are purported to have enhanced mechanical properties due to their composition, but their long-term durability is not known. PURPOSE The purpose of this study was to test the impact of aging on 3...