It has been suggested that salivary flow rate decreases with age. As is known, the presence of a thin salivary film layer is essential for the comfort of the mucosa beneath a denture base and for denture retention. The purpose of this study was to determine the flow rates, viscosity and the pH of resting and stimulated whole saliva before and after prosthetic treatment in complete denture wearing patients. Saliva was collected under clinical conditions between 08.00 and 10.00 hours. The flow rates of whole saliva were measured at three stages: (i) resting and stimulated saliva before prosthetic treatment; (ii) immediately after the first wearing of the complete denture; and (iii) resting and stimulated saliva after 2 or 3 months of wearing the complete denture. Saliva production was stimulated by chewing paraffin wax. Flow rate was calculated as collected volume/collection time. It was found that there was a significant difference between resting and stimulated whole salivary flow rates before and after complete denture wearing.
Within the limitations of this study, the intraoral colorimeter exhibited successful in vivo repeatability; however, the color difference detection performance of the device varied depending on the translucency of the specimens.
Background: There is limited knowledge on the effect of scan body (SB) material type, torque value, and sterilization on linear displacements of implant SBs.Purpose: To evaluate the effect of material type, torque value, and sterilization on linear displacements of SBs during screw tightening by using digital image correlation (DIC) analysis.Materials and Methods: One polyetheretherketone (PEEK, Zfx Intraoral Scan Body) and one titanium SB (Ti, MPS Zimmer Scanbody R1410) were tightened with 5 Ncm torque on two implants (Zimmer TSV ⌀4.7 mm) by using a digital torque limiting device. SBs' initial spatial positions relative to the implants were recorded by using 3D DIC technique. Measurements were repeated after initially increasing torque value to 10 Ncm and then to 15 Ncm, and these steps were repeated for a total of 10 PEEK and 10 Ti SBs on both implants (n = 20). All SBs were then sterilized 25 times by using an autoclave (STATIM 5000 S G4) according to manufacturer's rec-
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