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【目的】研制一种新型的高强度钙云母牙科切削陶瓷材料。【方法】筛选材料配方, 通过玻璃熔制、晶化热处理, 得到玻璃陶瓷, 用X 射线衍射分析玻璃陶瓷的晶相成分, 并用三点抗弯法测量材料的强度。【结果】得到了含钙云母的新型切 削陶瓷, 其三点抗弯强度最高达到(210.2±14.7)MPa 。【结论】通过改变金云母玻璃陶瓷内部的晶体结构可以得到新型具有 较高强度的牙科切削陶瓷。

【目的】评价3 种烤瓷贴面(PLV)牙体预备的近期临床效果。【方法】根据贴面形态和覆盖牙体范围将PLV 牙体 预备分为I 型、L 型和U 型3 种, 用于着色牙和前牙间隙、缺损等修复, PLV 采用长石质PLV 瓷系统制作, 双重固化树脂粘结 系统粘结, 观察6 ～ 22 个月, 考察3 种牙体预备类型的适应证、最终美学效果、粘接强度及牙本质敏感性等。【结果】35 例203 个瓷贴面修复后形态、颜色满意, 美学效果佳;无脱落, 仅局部崩折2 例, 近期粘接效果满意;备牙时牙本质暴露率达95.16 %, 粘固后牙本质过敏症状不同程度缓解。【结论】合理选择适应证、足够的牙体制备及高强度树脂粘结系统, 可保证3 种牙体预 备类型均能使PLV 获得良好的外形、满意的颜色及可靠的临床近期粘接强度;但牙本质过敏问题应予重视。

【目的】了解磁性固位的下颌种植覆盖义齿的应力状况及其分布规律, 为磁性固位体的临床应用提供生物力学 依据。【方法】采用二维光弹应力分析法, 分析圆柱形种植体在垂直向和侧向加载条件下种植体— 骨界面的应力状况。【结 果】种植体应力主要为均匀分布的压应力, 最大应力位于种植体根尖部, 颈部应力相对较小, 未见明显弯曲应力。【结论】磁 性固位种植义齿的种植体应力分布符合生物力学要求, 有利于种植体的长期成功。

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Copyright of Command Control & Simulation / Zhihui Kongzhi yu Fangzhen is the property of Command Control & Simulation Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Prevention & Treatment For Stomatological Diseases is the property of Journal of Prevention & Treatment For Stomatological Diseases Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To compare the safety and prognosis of drug-coated balloon (DCB) angioplasty and conventional balloon angioplasty in treating symptomatic intracranial atherosclerotic stenosis. Methods The patients with symptomatic severe intracranial atherosclerotic stenosis who were treated at The Affiliated Hospital of Qingdao University from March 2020 to April 2022 were retrospectively analyzed. Patients were divided into the DCB group and the conventional balloon group according to the treatment method. The general clinical data, efficacy, and safety endpoints, including perioperative complications, clinical outcomes, and imaging results during follow-up, were compared between the two groups. Results A total of 49 patients were included in the study, including 30 in the DCB group and 19 in the conventional balloon group. There were no significant differences in baseline data and perioperative complications, as well as stroke recurrence rate, restenosis rate and mortality within 6 months after surgery between the two groups (P>0.05). The DCB group exhibited a lower degree of restenosis at 14.50% (9.55%-23.42%), as compared to 30.00% (15.42%- 37.61%) in the conventional balloon group, with a statistically significant difference (P=0.027). Conclusions In comparison to conventional balloon treatment, DCB treatment is considered safe for symptomatic severe intracranial atherosclerotic stenosis and can effectively reduce the progress of target vessel restenosis. [ABSTRACT FROM AUTHOR]

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