Human saliva is a biological fluid of great importance in the field of dissolution testing. However, until now, no consensus has been reached on its key characteristics relevant to dissolution testing. As a result, it is difficult to select or develop an in vitro dissolution medium to best represent human saliva. In this study, the pH, buffer capacity, surface tension, viscosity and flow rate o...

OBJECTIVES To investigate the salivary anionic changes of patients with nasopharyngeal carcinoma (NPC) treated by radiotherapy. MATERIAL AND METHODS Thirty-eight patients with T1-4, N0-2, M0 NPC received conventional radiotherapy. Stimulated whole saliva was collected at baseline and 2, 6 and 12 months after radiotherapy. Salivary anions levels were measured using ion chromatography. RESULT...

The aim of this study was to assess the surface characteristics and to compare the corrosion potential of metal brackets and wires in environments containing different media. Four brands of metal brackets and two types of orthodontic wires [stainless steel and nickel-titanium (NiTi)] were investigated. An electrochemical assay was used to compare the corrosion potential (V) of the brackets and ...

OBJECTIVES The purpose of this study was to evaluate the effect of salivary pH on the shear bond strength (SBS) of orthodontic brackets to tooth surface. MATERIALS AND METHODS Eighty intact premolars were randomly divided into four groups of 20. After bonding a bracket on each tooth, the groups one to four were stored in artificial saliva at a pH of 3.8, 4.8, 5.8, and 6.8, respectively for tw...

Objective: To examine the pH response to an acidic challenge in site-specific plaque following a six-week period of using toothpaste consisting of 1.5% arginine and 1450 ppm fluoride or just using 1450 ppm fluoride toothpaste alone, in relation to caries. Methods: Thirty-three healthy adults with no caries (caries-free) or ≥1 current manifest lesion (caries) participated in the study. Interprox...

High entropy alloys are a new type of multi-component material with improved mechanical properties that could be useful in medical implants. The corrosion behavior biomedical Ti70Zr20Nb7.5Ta2.5 alloy was examined and matched commercial Ti the traditional biomaterial Ti6Al4V artificial saliva. Moreover, impact different pH concentrations fluoride ions on also investigated. Ecorr decreases follow...

Aim: To assess the anticariogenicity of microwave-assisted 0.5% extract of Stevia rebaudiana leaves in high caries risk patients. Materials and methods: Forty-six patients with high risk for caries were selected. They were randomly assigned to two groups; group I was allocated for chlorhexidine (CHX) mouthwash (0.12% Perio-Aid) and group II for S. rebaudiana (0.5% extract of Stevia bio) mouthwa...