安氏Ⅲ类错(秴)矫治后三种保持方式对牙周影响的研究

目的:研究三种不同保持方式对安氏Ⅲ类错(秴)矫治后牙周健康的影响.方法:30例安氏Ⅱ类错(骀)固定矫治结束的患者,分别使用Hawley保持器、舌侧固定保持器和唇侧高强纤维固定保持器,于戴入后3、6个月记录牙龈指数(GI)、龈沟出血指数(SBI)、菌斑指数(PLI).结果:Hawley保持器各项牙周指数差异无统计学意义.舌侧固定保持器GI、SBI、PLI在使用后均有显著性差异.唇侧固定保持器组GI、SBI中无明显差异,但PLI增高,有统计学差异.结论:Hawley保持器对牙周组织的影响最小,舌侧固定保持器不利于牙周维护.唇侧高强纤维固定保持器配合口腔卫生宣教更利于安氏Ⅱ类错(秴)术后的保持.     

Randomized clinical trial on single retainer all-ceramic resin-bonded fixed partial dentures: Influence of the bonding system after up to 55 months

Objectives

This study evaluated the clinical outcome of all-ceramic resin-bonded fixed partial dentures (RBFPDs) with a cantilevered single-retainer design.

Methods

Thirty anterior zirconia ceramic RBFPDs were inserted using either a phosphate monomer containing resin (Panavia 21 TC; N = 16) or an adhesive bonding system with a phosphoric acid acrylate primer (Multilink–Automix with Metal/Zirconia primer; N = 14).

Results

During a mean observation time of 41.7 months one debonding occurred in each group. Both RBFPDs could be rebonded successfully resulting in a three-year survival rate of 100%.

Conclusion

Independent of the bonding system cantilevered zirconia ceramic RBFPDs showed promising results during the first three years.

Clinical significance

Single-retainer zirconia ceramic RBFPD present an alternative treatment option offering good aesthetics, a minimal invasive preparation, a high biocompatibility and can even be used to treat juvenile patients who do not yet come into consideration for implant placement. No significant influence of the bonding system used was detected so far.     

透明压膜保持器与传统可摘保持器对牙周健康的影响

目的：观察透明压膜保持器是否影响牙周组织的健康。方法：62例正畸患者固定矫治结束、去掉固定矫治器。进行全口牙周洁治、牙面抛光后，测量临床牙周指标(PD、PLI、GI)作为基线水平；随机分为2组，分别戴入透明压膜保持器与传统可摘保持器，测量1周、1个月及3个月临床牙周指标。结果：戴入透明压膜保持器临床牙周指标显著增高(比传统可摘保持器)。结论：透明压膜保持器对牙周组织健康有影响，对戴入透明压膜保持器的患者加强口腔卫生保健是十分重要的。     

Static strength of molar region direct technique glass fibre-reinforced composite fixed partial dentures

The aim of this study was to determine static fracture force of fibre-reinforced composite (FRC) fixed partial dentures (FPD) with different retainer designs. The fabrication simulated the process to make directly made 3-unit maxillary molar FPD. Four types of retainers were tested (n = 5): conventional crown preparation (1.2 mm axially and 2.0 mm occlusally), slot preparation (3.5 mm high x 3.5 mm wide x 1 mm deep), no preparation with broad fibre abutment contact, and combination of the slot and broad fibre contact were performed. The FPD contained unidirectional E-glass FRC veneered with particulate reinforced composite. Dimensions of the FPDs were homogenized. FPDs were stored at 1 week 37 degrees C deionized water, thermocycled between 5 degrees C and 55 degrees C (5000 cycles, dwell time 10 s) and statically loaded to failure. The slot retainer design yielded the lowest mean load to initial and final failure (FF) (1284 and 1313 N, respectively), the crown retainer the highest mean load to initial failure at 1755 N, and the combination retainer resulted in the highest mean load to FF (1836 N) (anova, P < 0.001; Tukey multiple comparisons, 0.05 significance level). The results of this study suggest that the fabrication of direct FRC FPD does not necessarily require extensive preparation for the retainers.     

标准冠内固位体在口腔固定修复领域中的初步应用

目的：探讨成品专用固位体在口腔修复领域中应用的可行性。方法：用荷兰产微型气动弯手机和特制钻头在缺牙两侧基牙近远中面钻孔。将成品专用钛合金冠内固位体粘接在基牙邻面上，制取精确印模，灌制带专用固位体代型的工作模型，铸造抗力桥架并烤瓷人造牙制作固定桥，并将此固位体用于固位条件不良的全冠、桩冠、种植义齿的辅助固位。结果：共制作188例各类固定修复体，其中无冠式固定桥98例，配合全冠制作的固定桥62例，桩冠20例，人工种植牙1例，全冠7例。因适应症选择不当或不规范操作造成在20个月内共6例无冠式固定桥发生松动脱落。结论：此法具有磨牙少、痛苦小、省时简便等优点。也可用于辅助固位。     

血链球菌对磁性固位体耐腐蚀性能的影响

目的:比较磁性固位体在有、无血链菌存在的人工唾液中受腐蚀后金属离子的析出情况.方法:将磁性固位体分别置于装有人工唾液的培养瓶中,随机选取10瓶,加入血链球菌悬液.其余10瓶作为对照.培养瓶置于36℃培养箱内培养,分别于3d、10d和20d时取出5ml混悬液,送实验室检测混悬液中的Fe3 、Mn2 析出的量.分析磁性固位体金属腐蚀的情况.实验数据采用SPSS10.0软件包进行单因素配对t检验.结果:在含血链球菌的人工唾液中,磁性固位体受腐蚀释放出的Fe3 、Mn2 在3d、10d、20d时的检出量显著高于对照组(P＜0.01).结论:血链菌会明显破坏磁性固位体金属的耐腐蚀性.     

应用磁性固位体修复无牙颌上颌骨、颧骨、眼眶联合缺损恢复口腔功能的探讨

Combineddefectsincludingedentulousjaws，zygomaandorbitisuncommoninclinic，whichaffectpatients＇masticationfunction，languageandswallowingfunction，andcausemalformationoffaceandphysiologicalandpsychologicalinjuries犤１犦．From１９９９to２００１，werepairedcombineddefectsbyusingmagneticretain－er．Therapeuticeffectissatisfying．１Subjectandmethod１．１SubjectDuring１９９１～２００１，６outpatientswithjawdefectsenteredourstudy．Thesepatientsincluded４menand２womenaged５７～７３years（meanage：６…     

哈利氏保持器与压膜式保持器的临床比较研究

目的：通过观察哈利氏保持器与压膜式保持器在临床应用的情况,分析比较两种保持器的优缺点。方法：选择结束治疗期的正畸患者60例（拔牙患者）,分成两组（哈利氏保持器组和压膜式保持器组）,各自采用哈利氏保持器与压膜式保持器进行保持,分别对患者和医师在使用和制作保持器时6个方面的感受进行评分,评价两种保持器各自的优缺点。结果：佩戴舒适度方面、使用便利度方面、制作方便度上,压模式保持器更有优势,两组有统计学差异。耐用度上,哈利氏保持器更耐用。戴用时隐形度方面、牙列保持度方面,两组无差别。结论：两种保持器各有优缺点,除了开患者只能选择哈利氏保持器外,其它类型患者两种保持器都可使用。     

改良压膜透明保持器在安氏Ⅱ类错中的疗效观察

目的探讨改良透明压膜保持器在下颌后缩为主的安氏Ⅱ类错保持治疗中的临床疗效。方法选择48例年轻恒牙以下颌后缩为主的安氏Ⅱ类错患者,固定矫治结束后,随机分为2组,每组24例,分别采用普通透明保持器和改良式透明保持器。2年后观察矢状向的稳定性。结果改良式透明压膜保持器保持治疗2年后,配戴前、后的头影测量值改变在统计学上无显著性差异(P>0.05),前牙覆覆盖关系保持稳定并有减小趋势。普通透明压膜保持器组配戴前、后的头影测量值改变在统计学上有显著性差异(P<0.05)。结论改良式透明压膜保持器在年轻恒牙以下颌后缩为主的安氏Ⅱ类错患者矫治后保持中具有稳定上下颌关系的确切疗效。