树脂加氟预防可摘局部义齿基牙龋的初步研究

目的：探索树脂加氟预防可摘局部义齿基牙龋的可行性,方法：对自制加氟自凝树脂进行横向弯曲,体外和体内释放试验。结果：氟对自凝树脂横向弯曲变形无不利影响;加氘树脂在生理盐水中持续低浓度释放氟离子,置于局部义齿中后,相邻基牙菌班内氟离子浓度较对照牙有显著升高（P＜0．01）,而唾液中氟离子浓度无明显变化（P＞0．01）,结论 ：树脂加氟可在一定时间内持续有效提高局部氟离子浓度。     

可摘局部义齿的基牙健康状况研究

可摘局部义齿的基牙健康状况研究余占海霍绥梅刘斌为了解可摘局部义齿（Ｒｅｍｏｖａｂｌｅｐａｒｔｉａｌｄｅｎｔｕｒｅｓ，简称ＲＰＤｓ）对基牙健康状况的影响，自１９９０年起，先后选择１２８例牙列缺损患者进行了ＲＰＤｓ修复，并定期对他们进行了为期１年的临床...     

可摘局部义齿基牙龋坏的初步分析

本文对87人,96件可摘义齿基牙龋坏的114颗牙进行了临床初步分析。结果显示戴牙时间越长基牙龋坏越重,主要原因是卡环对基牙的磨擦,卡环位置不当,人工牙与基牙之间的接触关系不良。为减少基牙的龋坏,本文提出了一些设计制作可摘义齿中值得注意的问题及预防基牙龋坏的措施。     

氟化物预防可摘局部义齿基牙龋坏的研究进展

可摘局部义齿是临床上修复牙列缺损的主要方法之一。但戴用后可引起口腔微生态失调,促进菌斑沉积,导致基牙龋病和牙周病发病率升高,基牙丧失而使修复失败。本文就基牙龋坏原因及如何预防基牙龋坏作一综述。     

可摘局部义齿卡环对基牙的影响

目的 研究可摘局部义齿卡环对基牙牙体牙周及义齿的修复效果的影响。方法 采用社会调查和门诊连续随访的形式,对被卡环损伤了的３９７颗基牙（１４６名患者的１７９件义齿）进行了调查分析。结果 基牙损伤与年龄、义齿使用时间、义齿类型及义齿质量有关。结论 戴牙时间越长,基牙发生损伤越重。主要原因是基牙与卡环的摩擦过多或卡环位置不当。     

老年人可摘局部义齿修复对基牙的影响

目的:分析研究老年人可摘局部义齿修复后对基牙的影响,探讨其原因及预防措施。方法:对95例牙列缺失后的老年人行冷弯卡环固位式可摘局部义齿修复,记录和比较戴可摘局部义齿后基牙和非基牙的龋坏率和缺失率,用χ2检验分析其结果有无差异,并对影响基牙的原因进行分析。结果:戴用可摘局部义齿5a后,基牙的患龋率(17.38%)显著高于非基牙(7.10%);因牙折、牙周病松动及龋坏无法保留而拔除的基牙缺失率(27.01%)也显著高于非基牙(7.79%)(P<0.01)。结论:冷弯卡环固位可摘局部义齿修复后在一定程度上可增加老年人基牙的患龋率和缺失率。     

用桩冠作基牙的可摘局部义齿修复

临床上常见一些患者全牙列缺损，但以上、下尖牙多见残留部分较完整的牙根，因而要求进行义齿修复。临床上亦有拔除残根后进行全口或半口义齿修复、根管治疗后覆盖义齿修复、附着体修复等。作者自1996年开始采用保留适合做桩冠、且能承担可摘局部义齿固位力的残根，先完成桩冠修复，再用该桩冠做基牙，进行可摘局部义齿修复，取得了良好效果。现介绍如下：1.选择适宜作可摘局部义齿基牙的残根，牙根需有足够的长度及粗细合适的根管，尖周情况良好，牙龈、牙周无炎症。行完善的根管治疗后进行桩冠修复，要求桩冠钉长度达根长2/3，直径达1/2根…     

可摘局部义齿基牙健康状况的远期临床观察

为了深入探讨可摘局部义齿（ＲｅｍｏｖａｂｌｅＰａｒｔｉａｌＤｅｎｔｕｒｅｓ,ＲＰＤｓ）对口腔微生态系进而对基牙健康状况的影响,以及影响特点和相关因素［１］,我们先后对１２８例牙列缺损患者进行了ＲＰＤｓ修复,并对患者进行了为期４年的临床追踪观察。现将...     

可摘局部义齿基牙牙周指数和牙菌斑细菌相对分布

临床研究已经证实[1～3] ,戴用可摘局部义齿 (Ｒｅ ｍｏｖａｂｌｅＰａｒｔｉａｌＤｅｎｔｕｒｅｓ ,ＲＰＤｓ)会破坏口腔微生态平衡 ,进而对基牙牙体、牙周组织健康造成不良影响。为了进一步探讨ＲＰＤｓ对口腔微生态系影响的微观变化及特点 ,作者先后为 2 8例第一磨牙缺失的患者进行ＲＰＤｓ修复 ,并就基牙牙周指数及菌斑细菌相对分布变化进行了为期 4年的动态检测分析。现报道如下 :1　资料和方法1.1　病例选择本组 2 8例患者 ,男 17例 ,女 11例 ,年龄 2 3～ 5 4岁 ,均为第一磨牙缺失 (任何一区 )。从未戴过义齿 ,基牙无龋或充填物 ,牙龈…     

老年人可摘局部义齿修复后对基牙牙周状况的影响

目的：研究老年人戴用可摘局部义齿对基牙牙周健康状况的影响。方法：对56例牙列缺失后的老年人行可摘局部义齿修复,3个月、12个月后复查并记录基牙与对侧同名牙的菌斑指数、牙龈指数、探诊出血指数、探诊深度等四项牙周指标。结果：患者戴用可摘局部义齿后基牙的四项牙周指标明显高于对照牙（P〈0．01）;老年患者戴用可摘局部义齿后的3个月内,基牙的牙周指数均明显升高（P〈0．01）,12个月时基牙的牙周状况趋于稳定状态。结论：老年人戴用可摘局部义齿可引起基牙的牙周指数增加。     

All-ceramic surveyed crowns for removable partial denture abutments

All-ceramic restorations may have limitations when used in combinations with other treatment modalities. Removable partial denture (RPD) abutment crowns are typically shaped to provide guide planes, rest seats, and retentive areas. Porcelain-to-metal crowns are routinely fabricated with retentive contours in the veneering porcelain, but until recently, the contours of the other portions of the restoration were developed in metal. This article describes the fabrication of all-ceramic crowns for RPDs with rest seats and guide planes in densely sintered aluminum oxide and retentive areas in veneering porcelain. Within the limitations outlined, this procedure allows the practitioner to use all-ceramic crowns in situations previously reserved for metal or metal-ceramic restorations.     

基牙牙周损伤影响可摘局部义齿应力分布的三维有限元分析

目的 探讨三维红外扫描用于可摘局部义齿三维有限元建模的可行性,并分析基牙牙周损伤对可摘局部义齿应力分布的影响,以期为临床提供参考.方法 利用齿科非接触式红外扫描仪和Simpleware软件对下颌肯尼迪分类法Ⅱ类缺损的可摘局部义齿进行三维建模,构建正常牙槽骨组、牙槽骨吸收组和牙槽骨吸收伴牙周膜增宽组三维有限元模型.使用Abaqus有限元分析软件,研究垂直加载和颊侧45°加载条件下3组牙槽骨的应力分布.结果 垂直加载和颊侧45°加载条件下,3组模型均在义齿近中基牙和剩余牙槽嵴远中出现应力集中;牙槽骨吸收伴牙周膜增宽组近中基牙的应力最大(分别为3.57和2.50 MPa),其次为牙槽骨吸收组(分别为3.21和2.41 MPa),正常牙槽骨组最小(分别为2.63和1.79 MPa).颊侧45°加载时3组模型剩余牙槽嵴远中颊侧和远中位点上的应力值均大于垂直加载.结论 基于三维红外扫描的有限元建模方法是可摘局部义齿有限元应力分析有效的建模方式.     

Movement of abutments by removable partial denture frameworks with a hemimaxillectomy obturator

A laboratory experiment was conducted to measure the amount of movement in each of two directions on each of seven teeth, induced by three common designs of retainer, under both splinted and unsplinted conditions.An analysis of variance on a four-way, completely crossed, fixed-effects model showed significant main effects for design, splintedness, and teeth involved. Also of significance were the interactions between the factors of splintedness and teeth and between design and splintedness. Most of the variability in tooth movement was due to differences among the seven teeth (49.3 per cent of variance) and to the interaction of splintedness and teeth (20.2 per cent of variance).     

Visualization of stress and strain related to removable partial denture abutments.

The following conclusions are based on the conditions set forth in this investigation and apply to forces acting through a vertical direction of application only: 1. The unilateral removable partial denture produced no more stress than the bilateral removable partial denture. 2. The fully active Dalbo removable partial denture resulted in the greatest stressbreaking action. 3. The rigid Dalbo removable partial denture resulted in the least ridge displacement. 4. The rigid Dalbo removable partial denture resulted in the greatest stress concentrations in the distal abutment. 5. None of the attachments tested resulted in a distribution of the stresses along the edentulous ridge. 6. The use of two abutments (double abutments) resulted in greater stress concentrations in the distal abutment than the use of single abutments. 7. Forces in the single abutment were resisted along the long axis of the root. 8. Forces in the double abutments were resisted along the long axis of the distal abutment.     

可摘局部义齿修复后患龋风险预测

目的:评估可摘局部义齿修复后与患龋风险大小的关系,为临床工作提供一定的理论指导。方法:记录临床行可摘局部义齿修复的180例患者。在试戴义齿完成后进行口腔检查、口腔健康问卷调查和龋病活跃性实验检测,所得结果由Cariogram系统进行龋危预测,根据预测结果受试者被分为高风险患龋组和低风险患龋组,评估患龋的风险因素并进行统计学分析。结果:两组受试者的唾液流量和缓冲能力差异不明显,但高风险患龋组变形链球菌计数、菌斑指数普遍较高且饮食习惯不良者较多,两组差异有统计学意义(P<0.05);高风险患龋组龋均明显多于低风险组。结论:临床工作中可通过口腔卫生宣教、定期复查督导患者,控制菌斑量,同时减少日常高糖食物的摄入量,可降低戴用RPD后的患龋风险;变形链球菌对龋病的发生有正相关作用,唾液流量和缓冲能力在龋病的发生过程中作用不明显。     

Fracture resistance of cingulum rest seats in CAD-CAM tooth-colored crowns for removable partial denture abutments

Statement of problem

The prevalent use of computer-aided design and computer-aided manufacturing (CAD-CAM) for tooth-colored ceramic materials has led to several case reports and retrospective clinical studies of surveyed crowns used to support removable partial dentures. How the specific contour of a cingulum rest seat affects the fracture resistance of these CAD-CAM tooth-colored materials is unknown.