Comparison of effects of different fluoride containing prophylactics on the growth of Streptococcus mutans on titanium surfaces - an in vitro study.

The combined use of high fluoride (F-) concentration and acidic pH can weaken the corrosion resistance of titanium (Ti). Caries prophylactic products contain high amounts of F- and are applied at a low pH. The aim of our study was to determine whether the different forms of applied flouride has different effects on the growth of Streptococcus mutans on different titanium surfaces. Titanium with polished surface were treated with a gel (pH: 4,8) containing 1,25% olaflur, a rinse (pH: 4,4) containing 0,025% olaflur or a 1% aqueous solution of NaF at a pH of 4,5. Control discs were not treated. All discs were incubated with S. mutans for 21 days. To assess the amount of S. mutans protein assay analysis was performed at 5, 10 and 21 days. Scanning electron microscopic (SEM) investigations were also executed. By the 21st day significant differences could be observed in the bacterial protein quantity. The between group- comparisons showed that the rinse and gel were superior to NaF or control group (p < 0,01 and p < 0,05). Furthermore signs of corrosion could be observed in the group of gel treated discs. The results suggest that amine-fluoride content mouthwashes might be a suitable choice for prevention to the patients with dental implants.

[Navigation in implantology: Accuracy assessment regarding the literature]. / Navigáció alkalmazása az implantológiában: Összefoglaló áttekintés a pontossági adatok alapján.

Our objective was to assess the literature regarding the accuracy of the different static guided systems. After applying electronic literature search we found 661 articles. After reviewing 139 articles, the authors chose 52 articles for full-text evaluation. 24 studies involved accuracy measurements. Fourteen of our selected references were clinical and ten of them were in vitro (modell or cadaver). Variance-analysis (Tukey's post-hoc test; p < 0.05) was conducted to summarize the selected publications. Regarding 2819 results the average mean error at the entry point was 0.98 mm. At the level of the apex the average deviation was 1.29 mm while the mean of the angular deviation was 3,96 degrees. Significant difference could be observed between the two methods of implant placement (partially and fully guided sequence) in terms of deviation at the entry point, apex and angular deviation. Different levels of quality and quantity of evidence were available for assessing the accuracy of the different computer-assisted implant placement. The rapidly evolving field of digital dentistry and the new developments will further improve the accuracy of guided implant placement. In the interest of being able to draw dependable conclusions and for the further evaluation of the parameters used for accuracy measurements, randomized, controlled single or multi-centered clinical trials are necessary.