Keegan Spivey (northcourt73)

BACKGROUND There is some cases of perforation and undesirable properties of some primary molars stainless steel crowns. AIM The aim of this study was to compare the physical and mechanical properties of different commercial brands of these crowns. METHODS In an in vitro study, 10 stainless steel tooth crowns of the second primary mandibular molars size 6 of 4 different commercial brands (a total of 280 crowns) were evaluated. These crowns were included KTR Pre-trimmed and Crimped Nichro Stainless Steel Primary Molar Crowns (KTR, China); 3M Stainless Steel Primary Molar Crowns (ESPE, St paul; USA); NuSmile SSC Pre-contoured (Inc, Houstone, TX; USA) and Kids crown (Shinghung, Seoul; Korea). Corrosion and galvanic corrosion, wear, microhardness, compressive strength, fatigue strength of crowns and weight percent of elements were investigated. RESULTS The highest rate of microhardness, compressive and Fatigue strength of the crowns were made by Nu Smile > 3M > Kids Crown > KTR respectively. The highest rate of corrosion potential in corrosion and Galvanic corrosion tests was in KTR > Kids crowns > 3M > Nu smile respectively. The order of crown wear was KTR > Kids Crown > 3M > Nu Smile respectively. The highest amount of nickel element was found in the Nu Smile crown and the highest amount of chrome in the 3M crown with a significant difference with others (p less then 0.001). The KTR and Kids crowns lacked molybdenum. CONCLUSION The results showed that Nu Smile crown has better physical and mechanical properties than other evaluated crowns in this study. Copyright © 2019 Zhaleh Bamdadian, Nilgoon Pasdar, Abdolhamid Alhavaz, Shahram Ghasemi, Ali Bijani.BACKGROUND Temporomandibular dysfunction (TMD) is a term that encompasses a set of chronic painful conditions, and dysfunction in the orofacial region involving the muscles of mastication, the temporomandibular joints (TMJ) and related structures. It can affect individuals of any age. AIM We investigated the prevalence of temporomandibular disorder (TMD) and its association with anxiety and depression. METHODS Cross sectional study that conducted among 105 dental students (age 20-35 years). The assessment instruments were the Fonseca Anamnestic Questionnaire and the Hospital Anxiety and Depression Scale. RESULTS TMD was present in 52 (49.5%) students, and anxiety or depression was present in 53 (50.5%) students. The results of the HAD scale showed that 92 (83.4%) students had some level of anxiety or depression, 38 (36.2%) were border line for anxiety or depression, and 80 (76.2%) were diagnosed with anxiety or depression while regarding to the association of TMD with gender, 9 of 48 (17.3%) were males and 39 (82.7%) were females (P-value = 0.001). CONCLUSION Our study revealed a high prevalence of TMD. The women had a higher prevalence of TMD. Also, we reported the higher prevalence of anxiety and depression among TMD students. Copyright © 2019 Ahmed Wallan Alahmary.AIM This study aimed to investigate and assess primary and secondary dental implant stability during the osseointegration period. METHODS A total of 77 implants were placed in 42 patients with 26 males and 16 females. The study was conducted by comparing the resonance frequency analysis (RFA) values of the implants inserted in the lower jaw. RFA was done immediately after implant insertion and after 12 weeks. Results were statistically evaluated using SPSS Statistics for Windows, Version 7.1. Level of significance was set at P less then 0.05. RESULTS Significant differences were detected between the primary and secondary stability values, respectively. Maximum RFA value of 88 and the minimum value of 52 were observed. Stability values increased during the following three months, and all implants were successfully integrated without complication. CONCLUSION Our results indicate and suggest that there is a strong linear correlation between implant stability and ISQ values that can be directly e