Millimeter Marks And Probe Tip Diameter Standardisation From Commercially Available Periodontal Probes. A Comparative Study.

The periodontal probe is still the most important tool for a correct and reproducible periodontal diagnosis. The aim of this study was to verify the standardisation from millimeter marks and tip diameter of four currently marketed periodontal probes. 129 new probes were randomly acquired in the market: 9 Williams-Hu Friedy (group A), 50 Williams-Golgran (group B), 35 Williams-Neumar (group C) and 35 WHO-Hu Friedy (group D). Mark calibration was assessed by digital images that were analysed by an image analysis system. A digital caliper assessed the tip diameter. Blind duplicate measurements were undertaken. The calibration of mark measurements demonstrated that all probes used in this study were not precise, although groups A and D were more accurate than groups B and C (P 0.05). It can be concluded that some concern should arise regarding the standardisation of periodontal probes since they are relevant to minimise probing errors and consequently enhance the accuracy and reproducibility of periodontal probe-dependant measurements in clinical and epidemiological studies.33576

Effect Of Bismuth Subgallate (local Hemostatic Agent) On Wound Healing In Rats. Histological And Histometric Findings.

The aim of this research was to evaluate the effect of bismuth subgallate on wound healing. In 40 Wistar rats, two standard wounds (3.5 mm x 2 mm) were made using a biopsy punch on the back of each animal. Test wounds were filled with bismuth subgallate and control wounds with 0.9% saline. At 1, 4, 7, 11 and 18 days, the qualitative evolution of the granulation tissue morphology was observed and digitalized histologic images were evaluated. There were no significant histological differences between test and control. Histometrically, there were statistically significant differences between test and control (ANOVA--days 1 and 4; Student t test, p < 0.05--days 7, 11 and 18) in terms of the following parameters: area of ulceration--day 1; distance between epithelial edges--day 4; area of granulation tissue--days 7, 11 and 18. It was concluded that bismuth subgallate is biocompatible to the healing tissue, and did not interfere with the normal development of wound healing.131111