A review of selected dental literature on contemporary provisional fixed prosthodontic treatment: report of the Committee on Research in Fixed Prosthodontics of the Academy of Fixed Prosthodontics

One goal of the American Academy of Fixed Prosthodontics is regularly to publish comprehensive literature reviews on selected topics germane to the discipline of fixed prosthodontics. The following report is the result of this goal and focuses on provisional fixed prosthodontic treatment. Major subtopics include materials science and clinical considerations involving natural teeth and dental implants. The interrelationship between provisional and definitive fixed prosthodontic treatment is multifaceted and significant. Provisional therapy involves numerous materials and techniques that require special knowledge and technical experience. In this analysis, technical, clinical, and investigational articles are detailed and presented as a comprehensive literature review to provide contemporary guidelines. Referenced publications were found by conducting a Medline search and were limited to peer-reviewed, English-language articles published from 1970 to the present. Materials used with provisional treatment are discussed in terms of clinical selection and the influence of their physical properties on treatment outcome. Specific product names and manufacturers are included in this report only when they are cited in the original referenced publications.     

全国第六次口腔修复学学术会议纪要

由中华口腔医学会口腔修复学专业委员会主办,上海交通大学医学院附属第九人民医院口腔医学院承办的全国第六次口腔修复学学术会议于2009年10月27-28日在上海召开.会前中华口腔医学会口腔修复学专业委员会召开了换届大会,由张富强教授任中华口腔医学会第四届口腔修复学专业委员会主任委员.本次会议共收到论文384篇,注册参会代表495人,非注册参会代表253人,共748人.     

GI-Ⅱ型着色渗透玻璃渗透工艺与渗透深度关系的研究

目的　探讨不同的熔融渗透时间和温度下 ,玻璃在氧化铝中的渗透深度。方法　制作 Vita In-Ceram Alum ina和 GI- 氧化铝预烧体 ,分别用 A2和 IG2色玻璃进行渗透。按渗透时间不同分为 30、6 0、90、12 0、15 0和 180分钟组 ,渗透温度 110 0℃ ;按渗透温度不同分为 10 6 0、10 80、110 0、112 0和 1140℃温度组 ,渗透时间 1小时。用带标尺体视镜 (× 10 )分别测量各组的渗透深度。结果　渗透深度和时间的平方根呈线性关系 ,Vita和 GI- 组相关系数分别为 0 .9886和 0 .9932 ,回归方程分别为 d2 =0 .112 2 t- 0 .495 5和 d2 =0 .16 38t+0 .5 873;随渗透温度的升高 ,Vita的渗透速率增加 ,高于 110 0℃后下降 ,GI- 的趋势则相反。结论　 GI- 型玻璃具有较好的渗透性能 ,在 110 0℃的渗透温度下 ,推荐单冠和前牙桥体的渗透时间分别为 1小时和 3小时     

牙科可切削云母微晶玻璃呈色的研究

目的 研制用于牙科计算机辅助设计与辅助制作磨牙冠、可提供多种颜色选择的可切削四硅酸氟云母微晶玻璃。方法 采用正交设计技术，对影响微晶玻璃颜色的基础配方、色料组成及热处理制度进行筛选。结果 从基础配方中选择出影响呈色的2个主要因素：晶核剂F含量、Mg^2 ／K^ 比例；从多种色料中选择出主要色料CeO2；从热处理制度中选择出成核制度：650℃保持1h和晶化制度：1000℃或1050℃保持3h～4h,，结论 所研制的云母微晶玻璃，可提供4～5种牙科颜色，其切削性能良好，完全可以满足计算机辅助设计．辅助制作(CAD／CAM)系统的要求。     

Removal of overhanging amalgam: A comparative study of three instruments

This study compared the effects on tooth surface of three power-driven instruments commonly used to remove overhanging amalgam. Comparisons of methods of instrumentation were made on enamel, cementum, and amalgam. Cavitron, Roto Pro, and EVA system instruments were used. Findings showed significantly more abrasion on all surfaces in EVA groups compared with other groups. All surfaces in Roto Pro groups appeared to be smoother than in other groups. There appeared to be little difference between treated surfaces and control surfaces in the Cavitron group.     

新型美容牙科纤维／树脂复合材料桩钉的研制

目的 :研究高强玻璃纤维增强丙烯酸类树脂的力学性能 ;探索复合材料桩钉的成型方法。　方法 :用缠绕法制作预浸料 (S- GF/EAM树脂 ) ,用层压法制成单向纤维 /树脂复合材料 ,并测试其弯曲强度、弯曲模量和层间剪切强度。取适量的预浸料放入自制的模具中按复合材料成型工艺压制桩钉 ,并测试其纤维含量。　结果 :随着纤维含量增加 ,复合材料的弯曲强度和弯曲模量呈显著性增加 (P<0 .0 1) (弯曲强度 :1414.7± 6 4.5 Mpa,弯曲模量 :39.6± 1.6 Gpa) ,用模具压制的桩钉纤维含量为 (6 8.38± 1.6 7% )。　结论 :高强度玻璃纤维对丙烯酸树脂的弯曲性能具有增强作用。高强玻璃纤维 /EAM树脂复合材料桩钉可以满足临床需要。     

A conceptual framework for understanding outcomes of oral implant therapy

The use of implants has expanded so rapidly that its effectiveness for many clinical situations has not been firmly established. Dentists are responsible for making appropriate therapeutic recommendations for the management of partial and complete edentulism. These decisions require an understanding of the consequences or outcomes of treatment approaches. Outcome measures to evaluate the benefits of alternative therapies include longevity as well as physiologic, psychologic, and economic impacts. Future research should include outcome measures beyond implant prosthesis survival to more fully assess the practical impact of dental implants on the patient's oral health and to determine the most cost-effective approaches for managing completely and partially edentulous patients.     

A retrospective study of combined fixed–removable reconstructions with their analysis of failures

The survival rate and the reasons for failures of 130 combined fixed–removable reconstructions (CFR), incorporated in 112 patients, were assessed. Each CFR reconstruction was classified depending on its attachments: 76 reconstructions were attached with rigid, precise attachments, and constituted the rigid group; 54 reconstructions were attached with either semi-precision or individual attachments and were defined as the semi-rigid group. Of the 130 reconstructions, 41 were determined as complete successes, 39 as partial successes and 50 as failures, leading to 37 major repairs and to 13 new reconstructions. Three reconstructions failed due to technical reasons, 36 due to biological reasons and for 11 reconstructions, both categories of reasons were responsible for their failure. In total, technical reasons were counted 15 times in comparison to 73 biological reasons for those 50 failed reconstruction, with 29 fractured abutment teeth as the most common biological reason. Within the rigid group, 45 failed reconstructions were observed, whereas within the semi rigid group only 5 failures occurred, leading to an 8-year survival estimate (± SD) of 30·1% (± 6·9%) for the rigid group and 93·1% (± 3·9%) for the semi rigid group. Beside the attachment type, the anatomy of the partially edentulous tooth arch in form of the free-end situation and the dentate opposing jaw were identified as risk factors.