两种附着体义齿修复游离缺失的临床效果评价

目的 比较Mini-SGF附着体义齿和Preci-line附符体义齿修复游离缺失的临床效果。方法29例单侧或双侧游离缺失患者随机分成两组，A组13例患着（共34颗珠牙）行Mini-SGF附着体义齿修复，B组16例患者（共46颗基牙）行Preci-line附着体义齿修复，义齿完成后随防1～3结果随访3年，A、B两组29例患肯义齿围位和稳定均良好。修复后第3年A组有3颗、B组有4颗丛纤牙龈指数和牙齿动度为2度，牙槽骨有明显吸收．2组基牙的牙周指数、牙齿动度和牙槽骨明显吸收的发生率差异无计学意义（P〉0．05）。结论后牙游离缺失的患者采用Mini-SGF附着体义齿和Preei-line附着体义齿修复均可获得良好的临床效果。     

青年人正常牙牙动度参考值的研究

目的建立中国青年人正常牙牙动度参数的参考值范围。方法使用自行研制的FX-1型牙动度测量系统,对200名中国汉族青年人右侧上下领牙牙动度进行测量并归纳其参数范围。结果得到右侧上下领14颗牙的牙动度参数的正常范围,其牙动度参数的均值以下领前牙最大,下领第一磨牙最小。结论提取、量化正常牙牙动度参考值很有意义,可为临床诊断松动牙提供正常对照。牙动度均值越小牙齿越牢固。     

套筒冠义齿基牙状况变化的研究

套筒冠义齿多用于修复牙周病伴牙列缺损的病例,其基牙状况的变化是不容忽视的问题。本文将从基牙的应力变化、动度变化、固位力变化、牙槽骨变化和牙周维护等几方面进行综述。     

慢性牙周炎患者磁性附着体基牙牙周状况分析

目的 了解慢性牙周炎患者磁性附着体基牙的牙周状况。方法 选取2009年1月至2011年1月于中国医科大学附属口腔医院口腔修复门诊接受治疗的19例慢性牙周炎患者的45颗磁性附着体基牙作为研究对象,修复后随访观察3年,比较磁性附着体基牙在义齿修复前后的牙周袋探诊深度（PD）、牙齿松动度及义齿的稳定性状况。结果 磁性附着体基牙在口内3年的存留率达91.11%。磁性附着体基牙在义齿修复前及修复3年后的PD值分别为（2.17 ± 0.77）mm和（1.89 ± 0.67）mm,修复后较修复前的PD值减小,差异有统计学意义（P < 0.05）。部分基牙松动度在义齿修复3年后较修复前增大,可能与可摘局部义齿功能稳定性变差有关（P < 0.05）。结论 磁性附着体义齿对慢性牙周炎患者的弱基牙有保护作用。     

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目的了解慢性牙周炎患者磁性附着体基牙的牙周状况。方法选取2009年1月至2011年1月于中国医科大学附属口腔医院口腔修复门诊接受治疗的19例慢性牙周炎患者的45颗磁性附着体基牙作为研究对象,修复后随访观察3年,比较磁性附着体基牙在义齿修复前后的牙周袋探诊深度（PD）、牙齿松动度及义齿的稳定性状况。结果磁性附着体基牙在1：2内3年的存留率达91．11％。磁性附着体基牙在义齿修复前及修复3年后的PD值分别为（2．17±0．77）mm和（1．89±O．67）rnm,修复后较修复前的PD值减小,差异有统计学意义（P〈0．05）。部分基牙松动度在义齿修复3年后较修复前增大,可能与可摘局部义齿功能稳定性变差有关（P〈0．05）。结论磁性附着体义齿对慢性牙周炎患者的弱基牙有保护作用。     

下颌固定义齿不同松动度基牙应力分布的三维有限元分析

目的建立不同动度基牙的下颌固定义齿模型,探讨松动牙作为固定义齿基牙的合理性,以期为进一步的临床应用提供实验依据和指导。方法采用螺旋CT扫描,应用PHOTOSHOP CS2与ANSYS 11.0软件相结合建立下颌复合式固定桥模型。结果当3Ⅰ°松动时各基牙应力值显著增大且能观察到明显应力集中现象;当5或7松动时各基牙应力值也有不同程度的增加,但应力变化过程中并未观察到突然的应力增大现象。结论复合固定桥当两端基牙松动时,尤其是单根牙松动时,对基牙应力分布影响较大不宜单独作为基牙;而多根牙对应力分布的影响较小,可单独作为基牙;复合固定桥中间基牙有松动时,其松动度不论是Ⅰ度还是Ⅱ度都不会引起明显的应力集中,可选作基牙。     

卡环下基牙的铸冠修复

卡环下基牙的铸冠修复米延玲第四军医大学口腔医学院修复科可摘局部义齿的基牙患龋后，造成基牙损坏，影响义齿支持作用。对于牙体治疗后的基牙进行妥善、准确的冠修复，既可保护基牙，恢复义齿原有功能，又可减少患者不必要的开支，避免重作义齿。笔者采用下述方法，对支...     

高钉帽磁性附着体义齿在下颌牙槽嵴低平患者的应用

目的 高钉帽磁性附着体义齿在下颌牙槽嵴低平患者中的临床应用观察。方法 对15例下颌牙槽嵴低平患者采用高钉帽磁性附着体可摘义齿修复并进行2年的随访观察。结果 高钉帽磁性附着体可摘义齿修复患者的基牙牙槽骨吸收少,基牙松动度改变小,满意度高。结论 对于下颌低平牙槽嵴患者且基牙牙周情况良好的患者,高钉帽磁性附着体可摘义齿是一种较好的修复方式。     

牙种植体动度的研究进展

种植体动度是判断种植体预后的主要指标,也是基础研究中判断种植体-骨界面结合情况的重要依据。本文就牙种植体动度的分级方法、影响因素及测量方法等作一综述。     

固定义齿修复对牙周炎基牙的保护作用

目的：观察松动基牙固定修复的临床疗效。方法：随访 １９９４—１９９８年间 １３４例基牙松动 Ⅱ°左右采用金属烤瓷全冠、Ｎｉ—Ｃｒ合金铸造全冠修复的固定桥１５６件的患者，以义齿恢复功能和基牙健康状况作为评价指标。结果：１～２年义齿功能良好率为９５％，基牙健康率为９２％，３～４年义齿功能良好率为９０％，基牙健康率为８１％。结论：固定义齿修复既有利于保护牙周炎基牙健康，也有利于恢复咀嚼功能。     

Periodontal findings in patients 10 years after insertion of removable partial dentures

The purpose of this retrospective study was to evaluate the changes in the periodontal conditions of patients wearing different designs of removable partial dentures over long-term. Seventy-four patients treated with 101 mainly conical crown-retained dentures (CCRDs) or clasp-retained removable partial dentures (RPDs) or a combination of conical crown and clasp-retained dentures (CRPDs) were re-examined 10 years after insertion. Periodontal findings were compared with baseline values at insertion. A deterioration of the probing depths (PDs) and tooth mobility was found. The abutment teeth of the RPDs suffered more severe deterioration than the abutment teeth of the CCRDs and the CRPDs. The absence of a regular recall system for the patients may be responsible for this outcome.     

Periodontal status of teeth in contact with denture in removable partial denture wearers

The aims of the study were to determine the periodontal status of the teeth in contact with removable partial dentures (RPDs) and to compare them with other teeth in the opposing arch not related to any prothesis. The periodontal status was also assessed in relation to the age of the dentures. Four hundred and twenty-seven patients treated with RPDs from 1981 to 1986 were recalled for examination. Prior to prosthetic treatment they were given periodontal treatment and fillings when required. Initially all were given oral hygiene instructions and motivation. They were reviewed regularly only on a short-term basis. Eighteen patients were suitable for the present study comprising of eight males and 10 females whose mean age was 41 years. The RPDs were in use from 1.5 to 8 years (mean 4.6 years). The following parameters were assessed: Plaque index (PlI), Gingival index (GI), loss of attachment (LA) and tooth mobility. The wearing of RPDs resulted in higher PlI, GI and LA compared to the controls and these differences were statistically significant. There was an increased frequency of higher PlI, GI and LA with the increase in denture age. Minor changes in tooth mobility were observed. It was concluded that the wearing of RPDs was detrimental to periodontal health in patients whose oral hygiene was less than adequate.     

Usage and status of cobalt-chromium removable partial dentures 5-6 years after placement

The aim of this study was to describe the usage of cobalt-chromium (Co-Cr) removable partial dentures (RPDs) by patients 5-6 years after denture insertion and to find out the factors that affected their denture usage. A random sample of patients provided with Co-Cr RPDs from a dental teaching hospital in Hong Kong was selected. Patients were interviewed using a structured questionnaire concerning their assessment and use of the dentures. Those who had been constantly wearing their original RPDs were examined by one calibrated examiner under optimal clinical conditions. The response rate of the patients who could be contacted was 98%. The results from 189 patient interviews showed that usage of the RPDs declined with time and that half of the dentures had been discarded or replaced 5-6 years after insertion. These discarded RPDs had been in use for an average of 19.5 months. The main reason given by the patients for not using the RPDs was general dissatisfaction with the dentures in various combinations of comfort, fit and chewing ability and, less importantly, with food trapping and appearance. No statistically significant association between denture usage and their respective Kennedy classification was found. The status of the Co-Cr RPDs that had been constantly used for 5-6 years was generally good. The majority of these RPDs demonstrated fair to good cleanliness, stability and retention and had no defect of any sort.     

The influence of some demographic and clinical variables on psychosomatic traits of patients requesting replacement removable partial dentures

SUMMARY The purpose of this study was to investigate the influence of some demographic and clinical variables on psychosomatic traits of the patients who visited the prosthodontic section of the Dental Hospital at Tokyo Medical and Dental University for replacement of their removable partial dentures (RPDs). Sixty‐six patients with 50 maxillary and 44 mandibular RPDs completed the psychological measurements concerning their dentures using visual analogue scales (VAS). Female patients rated significantly lower satisfaction with the comfort of their dentures than males. Younger patients expressed less satisfaction with the aesthetics of their dentures than the older patients. The period of wearing the present denture significantly correlated with psychological measures of pain, comfort, and general satisfaction, suggesting that this clinical variable may be an important factor. There was no significant correlation between the patients' general satisfaction with dentures and the retention/stability scores assessed by the examiner.     

口腔卫生与可摘局部义齿基牙健康关系的研究

目的：观察可摘局部义齿（ｒｅｍｏｖａｂｌｅｐａｒｔｉａｌｄｅｎｔｕｒｅｓ，ＲＰＤｓ）基牙健康状况与患者口腔卫生的关系，以分析ＲＰＤｓ对口腔微生态系的影响因素。方法：根据有关标准和参考资料，测定患者简易口腔卫生指数、检查基牙牙体牙周组织发病情况、询问记录患者对义齿的使用保护情况及其口腔卫生习惯。结果：患者基础口腔卫生状况、对义齿使用保护情况及口腔卫生习惯，均与基牙健康密切相关，具有统计学意义。结论：患者口腔卫生状况与义齿基牙健康密切相关，而且是决定ＲＰＤｓ对口腔微生态系影响程度的重要因素。     

Oral health status of patients 5-6 years after placement of cobalt-chromium removable partial dentures

This study is a clinical survey of cobalt-chromium (Co-Cr) removable partial denture (RPD) wearers that aimed to investigate the effects of denture wearing on oral tissues. A random sample of patients who had received their dentures 5-6 years previously from a dental teaching hospital in Hong Kong was selected. Those who had been constantly wearing the RPDs were examined by one calibrated examiner under an optimal clinical setting. The patients' dental, periodontal and mucosal status were assessed. A total of 87 patients were examined. Mucosal lesions under the Co-Cr RPDs were uncommon in this study sample. However, there was a high prevalence of plaque, gingivitis and gingival recession, especially in dento-gingival surfaces in close proximity (within 3 mm) to the dentures. Thus, there is a special need for regular oral hygiene reinforcement, scaling and prophylaxis among RPD wearers. Despite a low caries incidence in the study sample, root caries were found to be associated with contact with the RPDs (P < 0.05) but coronal caries were not. It is recommended that coverage of the exposed root surfaces by RPD components should be avoided. Also, topical fluorides should be regularly applied onto exposed root surfaces as a preventive measure.     

Clinical application of removable partial dentures using thermoplastic resin—Part I: Definition and indication of non-metal clasp dentures

This position paper proposes a definition and naming standard for removable partial dentures (RPDs) using thermoplastic resin, and presents a guideline for clinical application. A panel of 14 experts having broad experience with clinical application of RPDs using thermoplastic resin was selected from members of the Japan Prosthodontic Society. At a meeting of the panel, “non-metal clasp denture” was referred as the generic name of RPDs with retentive elements (resin clasps) made of thermoplastic resin. The panel classified non-metal clasp dentures into two types: one with a flexible structure that lacks a metal framework and the other having a rigid structure that includes a metal framework. According to current prosthetic principles, flexible non-metal clasp dentures are not recommended as definitive dentures, except for limited cases such as patients with a metal allergy. Rigid non-metal clasp dentures are recommended in cases where patients will not accept metal clasps for esthetic reasons. Non-metal clasp dentures should follow the same design principles as conventional RPDs using metal clasps.     

A survey of treatment outcomes with removable partial dentures

The patient's satisfaction with removable partial denture (RPD) therapy has become an increasingly important factor in prosthetic treatment. This study examined patients' satisfaction with RPDs in relation to some socio-economic variables, patients' habits of wearing and cleaning RPDs, comfort of wearing RPDs and different RPDs characteristics. A questionnaire was devised for the purpose. Two hundred and five patients were required to assess satisfaction with RPDs. They graded RPDs, depending on the level of satisfaction, on scale ranging from 1 to 5. A dentist determined Kennedy classification, material and denture support, denture base shape, number of missing teeth and evaluated denture construction. Majority of the patients were satisfied with the prosthesis. The patients of a higher education level gave lower grades (P < 0.05) to aesthetics of maxillary RPDs. Almost half of the patients were wearing RPDs during the day. Most of the patients cleaned RPDs three times a day. A significant difference was found between the patients' grades for comfort of wearing mandibular RPDs and number of missing teeth and between hygiene of mandibular RPDs and habits of cleaning them. Majority of the patients treated with RPDs were satisfied with the prosthesis. Dissatisfaction was related to mastication, esthetics, number of missing teeth and maintenance of oral hygiene.     

Clinical examination and interleukin-1beta levels in gingival crevicular fluid in patients treated with removable partial dentures

PURPOSE: The purposes of this study were to investigate the periodontal status and susceptibility to periodontal disease progression of the teeth in contact with removable partial dentures (RPD) and to compare them with control teeth in mouths not restored with a partial denture, by means of both clinical parameters and interleukin (IL)-1beta levels in gingival crevicular fluid. MATERIALS AND METHODS: Twenty-eight periodontally healthy patients were selected for the study; 14 of them were treated with mandibular Kennedy Class I RPDs, and the other 14 patients were not restored for control. Clinical periodontal measurements were assessed, and crevicular fluid samples were collected from both abutment and control teeth to determine IL-1beta levels, which were measured by enzyme-linked immunosorbent assay. These procedures were performed both at baseline and 9 months after the insertion of the dentures. RESULTS: The wearing of RPDs resulted in statistically higher clinical scores and total IL-1beta levels compared to the baseline examination. In contrast, no statistically significant differences were found between baseline and 9-month examinations in the control group. CONCLUSION: RPDs are a risk factor for periodontal disease progression because of increased plaque accumulation associated with increased total IL-1beta levels and impaired clinical periodontal parameters.