萨拉·艾玛德
背景：由于骨骼和牙齿是具有相似结构和起源的组织，因此两者可能会受到相似代谢紊乱的影响，并且相同的过程可能导致骨质流失和牙齿问题。因此，我们的目的是评估与骨矿物质密度（BMD）相关的牙齿和牙周状况。
本研究的目的是利用有限元分析评估不同热机械处理对弯曲和扭转条件下旋转锉机械行为的影响。眼眶骨折是面部创伤后常见的情况。然而，并非所有情况都需要手术修复。目前修复的标准各不相同，具体取决于 CT 表现、临床特征和患者的偏好。本研究调查了过去 3 年来在诺斯威克公园医院口腔颌面外科就诊的眼眶骨折患者及其后续治疗情况。评估实验制备的纳米羟基磷灰石 (NHAP) 和市售无定形磷酸钙 (ACP) 再矿化剂对漂白牙釉质化学分析的影响。
本研究的目的是评估三种不同浓度的番石榴提取物对链球菌和乳酸菌的影响
方法： Fifty-nine women older than 30 that had undergone dual-energy X-ray absorptiometry during 2016-2017, in Shiraz, Iran, were given dental (decayed, missing, filled teeth/DMFT) and periodontal examination (periodontal disease index/PDI, oral hygiene index/OHI). Their BMD based on T-score and Z-score was also recorded. Data were statistically analyzed using SPSS (22). Chi-square, independent samples t-test, regression test and ANOVA were used and P0.05). A geometric model of a file (25/.06) with triangular cross section was created. The file FE model was built using CAD software. The same FE file model was used to create four models with different material properties, the data for the M-wire, CM wire, R-phase and NiTi alloys were obtained from the literature. The mechanical behavior of the four models under bending and torsion was analyzed mathematically in solid works software package.
Data was collected retrospectively from 01/01/2015 to 22/11/2018. All patients within the Trust who had CT and X-Ray facial bones, CT orbits and MRI orbits were included. From this data, patients who had orbital fractures were identified. The hospital records were then reviewed, noting which patients had surgical management, the reasons for repair and timing of repair. Non-surgical cases and post operative complications were also recorded. Thirty-five upper anterior bovine teeth were prepared for this study. The teeth had their roots removed at the Cemento-Enamel Junction (CEJ), and the pulp chambers were sealed using acrylic-resin. The teeth were randomly divided into two main groups; the control group (n=7), which did not receive any bleaching treatment (baseline), and the experimental group (n=28); which was further divided into two subgroups (n=14) representing the photo-activated and chemically-activated in-office bleaching agents that were applied to the enamel surface according to their manufacturer instructions. Each subgroup was further divided into two divisions (n=7) receiving the experimentally prepared NHAP and the commercially available ACP remineralizing agents. The chemical analysis of the calcium and phosphorus ion levels was performed using an environmental energy dispersive x-ray analysis (EDX). Guava extract was prepared by extracting it from the plant leaves in the laboratory of Faculty of Pharmaceutical Department and three concentration was obtained (1%, 0.5%, 0.25%). Plaque and salivary samples were obtained from volunteer’s children patients and Streptococcus mutans and Lactobacillus bacteria was assessed. The efficacy of the three concentrations was evaluated against those bacteria through a well-diffusion method employing 10 ml of each solution per well.
Result: There was a negative correlation between DMFT and T-score of spine and femur (r=-0.280, p=0.032 and r=-0.284, p=0.029 respectively). No association was found between PDI and T-scores or Z-scores for BMD (p>0.05). Also, there was a significant negative correlation between number of missing teeth and T-score of both femoral and spinal regions (r=-0.277, p=0.034 & r=-0.390, p=0.002 respectively); however, such an association was not found with Z-scores (p= 0.430 and p= 0.081 respectively). Additionally, a strong positive correlation was observed between OHI and DMFT. (r=0.440, p=0.008).
The results showed that both photo-activated and chemically-activated in-office bleaching systems had slightly affected the chemistry of enamel surface. There was no statistically significant difference between both bleaching agent groups.
Our results showed that there was a significant difference on using the extracts on Streptococcus mutans diameter inhibition zone in 0.25% and 1% concentrations. While on using the 0.5% concentration, there was no significant difference. Regarding the Lactobacillus diameter inhibition zone, there was a significant inhibition zone after using guava extract in different concentration including 1% and 0.25% while the 0.5% concentration showed no significant difference.
Conclusion: In this investigation, a negative association between BMD and oral health condition was found. It suggests that inadequate bone mass could coexist with a worse oral health condition; nevertheless, further studies are required to confirm that. Thermomechanical treatment of rotary instruments resulted in improving the flexibility and the torsional resistance of these files.
目前，还没有严格的、基于证据的指南使我们能够明确决定眼眶骨折的治疗方法。实践可能差异很大，应基于风险收益分析。我们的结果将阐明我们部门的指导方针，并可能帮助其他人清楚地了解修复眼眶骨折的频率和时间。漂白程序后应用实验性 NHAP 再矿化剂并没有显着改变漂白牙釉质表面的钙和磷离子水平。
1% 的番石榴提取物显示出最高的细菌抑菌圈平均值，其次是 0.5%，而最低值出现在 (0.25%)。