دکتر حسنا ابراهیمی‌زاده

Background: This study aimed to assess the microhardness and morphology of permanent dentin following the application of Iranian and foreign-made desensitizing toothpastes. Methods: This in vitro, experimental study evaluated 48 dentin samples prepared of the extracted sound human permanent molars. Dentin samples were randomly divided into three groups (n=16) and subjected to the application of Pooneh Iranian desensitizing toothpaste, Colgate Sensitive Pro-Relief (Poland), and no intervention (negative control). Each dentin sample was then immersed in 5 mL of a demineralizing solution for 10 hours and underwent a demineralization/remineralization cycle (pH cycling) for 14 days. The mean microhardness of the samples was measured at baseline after demineralization and after 14 days. One sample of each toothpaste group was selected for the scanning electron microscopy (SEM) assessment of dentin morphology. Finally, repeated-measures ANOVA was used to analyze the effect of time and type of toothpaste on microhardness using SPSS, version 21.

Aim : According to the large number of studies, there seems to be a significant relation between hyperdivergence growth pattern and temporomandibular disorders. However, it is not clearly scrutinized which morphological factors can contribute to the development of
temporomandibular disorders.The aim of this study was to investigate the relation between some skeletal and facial morphologic features of hyperdivergent facial growth pattern patients and temporomandibular disorders.