In Vitro Effects of Four Porcelain Surface Treatment Methods on Adhesion of Lactobacilli Acidophilus

Objective: Adhesion of Lactobacillus acidophilus (L. acidophilus) to dental porcelain surface may lead to gingival inflammation and secondary caries. Surface roughness is among the factors affecting this adhesion. The purpose of this study was to evaluate the effects of four different  surface treatment methods on adhesion of L. acidophilus to dental porcelain.Methods: Sixty specimens (3x10mm) were fabricated of Noritake porcelain and divided into 4 groups (n=15) treated with one of the following four surface finishing techniques:    1. Auto-glazing;2. Over-glazing; 3. Polishing with Kenda kit and 4. No surface treatment (non-glazed specimens). Specimens were inoculated with bacterial suspension containing 1x106colony forming units per milliliter (CFU/mL) and L. acidophilus adhesion to the surfaces was evaluated using a spectrophotometer. Data were analyzed using one-way ANOVA and Tukey’s HSD test.Results: The mean bacterial adhesion was 0.1440 (0.00429) to auto-glazed specimens, 0.0750 (0.00256) to over-glazed specimens, 0.1800 (0.00325) to polished specimens and 0.7064 (0.00408) to the non-glazed specimens. The differences in this regard among groups were statistically significant (p<0.001).Conclusion: Over-glazed specimens caused the lowest and non-glazed specimens caused the highest bacterial adhesion. The glazed surfaces caused less adhesion than the polished surface

Investigating the relation between removable denture prosthesis and sublingual varices

Objective: In this research, the scientific and practical question, whether or not people with sublingual varices were more exposed to dental prosthesis than those who did not have sublingual varices, was answered. Materials and Methods: The case-control study was done by referring to the Kahrizak Alborz charity sanatorium. A list of seniors over 60 years were prepared and referred to each of them after justifying the plan and obtaining their consent were analyzed, sampled. The case group was those who suffered from sublingual varices and the control group were those who did not have sublingual varices and in terms of age, sex, smoking, high blood pressure and leg varice were similar to those of the case. Varices detection was evaluated by clinical examination and according to the standard method. Sublingual varices were examined and recorded based on age, sex, dental prosthesis, smoking, leg varices, blood pressure, literacy level. Exposure level of two groups with denture prosthetics were Judged by the statistics with chi-square test, Fisher exact, and odds ratio. Results: A total of 141 patients with sublingual varices and 141 controls were studied. The subjects were two groups. Exposure to denture in the control group was 65 (46%) and in the case group 100 (71%). Conclusion: It seems that having removable denture prosthesis increases the chance of developing sublingual varices.       &nbsp