四种根尖倒封闭材料边缘微渗漏的定量比较研究

目的　比较研究四种牙体修复材料的根尖倒封闭性能。方法　用标准纸尖法和染料渗透法相结合 ,定量分析离体牙根尖倒封闭术后不同时间的边缘微渗漏情况。结果　染料浸透 7d、14d、2 8d时 ,各试验组间边缘微渗漏差异有极显著性 (P <0 .0 0 0 1) ,玻璃离子组边缘微渗漏情况明显优于合金组 (P <0 .0 5 ) ;2 8d时 ,各试验组根管内纸尖吸液体积均值的大小顺序为 :银汞合金组 >镓合金组 >自凝型GIC组 >光固化型GIC组 (P <0 .0 5 )。结论　光固化型玻璃离子粘固剂比其它三种材料具有更好的根尖倒封闭性能     

根尖倒充填术微渗漏的研究进展

根尖倒充填术扩大了保留牙齿的适应证的范围,提高了患者的生活质量,但是对决定手术能否成功的关键因素—根尖倒充填微渗漏的研究结果仍然不统一。本文从根尖切除方法、根尖切除斜度、根尖切除后术区处理、根尖倒充填材料等方面加以综述。     

根尖倒充填术后根尖微渗漏的影响因素

根尖倒充填术后根尖发生微渗漏是导致根尖手术失败常见的原因之一。根尖倒充填术后根尖微渗漏的影响因素有很多,包括根尖切除方法及根尖窝洞预备,对根尖牙本质表面的处理,不同的根尖倒充填材料,以及根管是否充填和pH值等。本文对此作一综述。     

不同根尖倒充填材料的微渗漏研究

目的 评价MTA、玻璃离子水门汀、复合树脂3种根尖倒充填材料根尖封闭性能.方法 60颗实验牙沿釉牙骨质界截冠,冷侧压法充填根管后,切除根尖3 mm.实验组超声倒预备3 mm,分别以MTA、玻璃离子水门汀、复合树脂做倒充填,固化后上段取出牙胶.对照组保留根尖3 mm牙胶.连接于改良葡萄糖定量检测微渗漏模型,分别在1、2、4、7、10、15、20、30 d测定从冠方向根方渗漏的葡萄糖的量.结果 MTA、玻璃离子水门汀、复合树脂3种材料葡萄糖渗漏量均小于0.60 μl/24 h,从第4 d起,MTA的渗漏量显著低于玻璃离子水门汀和复合树脂(P＜0.05).结论 MTA、玻璃离子水门汀、复合树脂3种材料短期内的根尖封闭性均较好,MTA优于其它两种材料.     

Er,Cr:YSGG激光切割对牙根尖封闭效果影响的微渗漏研究

目的 :探讨Er,Cr:YSGG激光进行根尖切除、预备后对倒充填材料密合性的影响 ,为此激光在临床上的应用提供重要的理论及实验依据。方法 :将 32个新拔除的单根离体牙随机分成 4组。去除牙冠 ,常规根管充填。第 1组 ,不做任何处理 ,作为阳性对照组 ;第 2组 ,手机切割组 ,手机进行根尖切除、预备后 ,银汞合金倒充填 ;第 3组 ,激光照射组 ,2WEr,Cr:YSGG激光于无水条件下照射根尖区 6s;第 4组 ,激光切割组 ,4WEr,Cr:YSGG激光于喷水条件下进行根尖切除、预备后 ,银汞合金倒充填。采用微渗漏实验对此激光切割后的牙根尖封闭效果进行评估。结果 :与阳性对照组相比 ,激光照射组的染料微渗漏深度无显著改善 (P >0 .0 5 ) ;与手机切割组相比 ,激光切割组的染料微渗漏深度有所减少 ,但并无显著性差异 (P >0 .0 5 )。结论 :Er,Cr:YSGG激光进行根尖切除、预备与常规手机预备具有同样的根尖封闭效果 ,因此有望在根尖倒充填术中取代手机 ,应用于口腔临床。     

GuttaFlow根管充填系统根尖封闭的微渗漏研究

目的评价GuttaFlow常温流动牙胶根管充填系统的根尖封闭性能。方法实验牙沿釉牙骨质界截冠,逐步后退法根管预备,2.5%次氯酸钠冲洗,分别以GuttaFlow常温流动牙胶和SystemB联合ObturaⅡ热牙胶充填系统充填根管。采用改良葡萄糖定量检测微渗漏模型测定第1、2、4、7、10、15、20、30d从冠方向根方渗漏的葡萄糖量。结果GuttaFlow常温流动牙胶和SystemB联合ObturaⅡ热牙胶充填系统的根尖封闭性能均较好,第7d起,GuttaFlow常温流动牙胶的封闭能力显著优于SystemB联合ObturaⅡ热牙胶充填系统(P<0.05)。结论GuttaFlow常温流动牙胶根管充填系统观察期内具有较好的根尖封闭能力。     

新型硅酸钙基生物材料用于根尖倒充填的封闭性能和粘接强度的研究

目的:评价和比较硅酸钙基生物材料iRoot BP Plus和MTA作为根尖倒充填材料的封闭性和粘接强度.方法:收集因正畸或牙周病新鲜拔除的单根离体牙93颗,截去牙冠后行常规根管预备、根管充填,切除根尖3mm后行根尖倒预备,随机分为3组:A组(iRoot BP Plus组)、B组(MTA组)、C组(GIC组),分别行根尖...     

根尖倒充填材料的研究进展

根尖倒充填术的目的是严密封闭根尖孔与根尖周组织的交通，预防根尖微渗漏，常用于非手术治疗失败，不能用常规方法进行根管治疔术且要尽量保留患牙的病例。由于大量材料已应用于根尖倒充填，本文对各种以往在临床和动物实验中常用的根尖倒充填材料作一简要综述。     

窝沟封闭边缘微渗漏研究进展

窝沟封闭术是现已公认的一项有效预防牙面窝沟裂隙龋的方法。窝沟封闭后边缘微渗漏的存在可影响封闭效果。笔者就影响窝沟封闭边缘微渗漏的各种因素相关研究进展进行综述。     

MTA用于根端囊肿根尖倒充填的临床评价

目的:观察根端囊肿术中应用MTA根尖倒充填的临床疗效。方法:临床确诊为根端囊肿病例共30例,病灶牙均为上颌前牙,术前常规根管治疗并超充填牙胶尖,术中刮除囊壁后去除病灶牙根尖3 mm,最后应用MTA根尖倒充填并封闭根尖孔区。结果:30例患牙均取得成功,术后3年无复发,且病灶牙与颌骨均愈合良好。结论:根端囊肿术中应用MTA根尖倒充填取得较好的临床疗效,且操作方便,无不良刺激反应,是一种较理想的治疗方法。     

The use of MTA in teeth with necrotic pulps and open apices1

Abstract – Three clinical cases have been treated with the use of an apical plug of MTA for apexification. All three cases were central incisors that had suffered premature interruption of root development as a consequence of trauma. According to the treatment protocol, the root canals were rinsed with 5% NaOCl; then, calcium hydroxide paste was placed in the canals for 1 week. Consequently, the apical portion of the canal (4 mm) was filled with MTA. The remaining portion of the root canals was then closed with thermoplastic gutta‐percha. At 6‐month and 1‐year follow‐up period the clinical and radiographic appearance of the teeth showed resolution of the periapical lesions. MTA appears to be a valid option for apexification with its main advantage being the speed at which the treatment can be completed.     

Reinforcement of Simulated Immature Permanent Teeth after Mineral Trioxide Aggregate Apexification

Objectives

The objectives of this study were to compare the fracture resistance of simulated human immature teeth that have undergone mineral trioxide aggregate (MTA) apexification and have been root-filled with fiber post, composite resin, MTA, or gutta-percha.

VITAPEX糊剂在根尖诱导成形术中的疗效观察

目的　观察Vitapex糊剂在根尖诱导形成术中的疗效。方法　随机选择门诊64例牙髓坏死根尖未发育的年轻恒牙。根管预备,消毒后用Vitapex糊剂进行根尖诱导,随访3年。结果　成功24例(占37·5%),进步37例(占 57·81%),失败3例(占4·69%),总有效为61例(占95·31%)。结论　Vitapex糊剂是一种较理想的根尖诱导制剂。     

MTA用于年轻恒牙活髓切断的临床观察

目的观察MTA在年轻恒牙活髓切断术中的临床疗效。方法随机选择7-13岁患儿79颗牙根未发育完全而露髓的患牙,随机分为2组,分别用MTA和氢氧化钙作为活髓切断后的盖髓药物,随访观察两组疗效的差异,并采用χ2、U检验作统计学分析。结果MTA组成功率96%,氢氧化钙组成功率71%,两组有显著性差异(P<0.05)。结论MTA是良好的活髓保存药物,用于活髓切断时疗效优于氢氧化钙。     

三氧化矿物凝聚体修补髓室底穿孔的疗效观察

髓室底穿孔在牙髓病治疗中常见,但预后较差.临床上常用光固化氢氧化钙进行修补,但由于充填物边缘微渗漏易导致穿孔区炎症复发使疗效不理想.我院采用三氧化矿物凝聚体(MTA)修补髓室底穿孔42 例,观察1 年以上,成功率明显优于常规修补材料.MTA具有较好的封闭性、生物相容性,是一种良好的髓室底穿孔修复材料,值得临床推广应用.     

用罗丹明B染料比较MTA、GIC和银汞合金的根尖封闭性

目的:用罗丹明B染料比较MTA、GC Fuji Ⅱ(GIC)和银汞合金的根尖封闭性.方法:将离体牙分别用以栽上3种材料进行根尖倒充填后,用0.2%罗丹明B溶液染色,再将牙体纵劈,置于解剖显微镜下测量洞壁染料渗透最大深度并拍照.SPSS10.0统计软件进行分析.结果:MTA组的渗漏深度显著小于银汞合金组(P＜0.05),而银汞合金组的渗漏深度显著小于GC Fuji Ⅱ组(P＜0.05).结论:3种材料中,MTA的根尖封闭效果最好,其次为银汞合金,而Fuji Ⅱ的效果最差.     

Treatment of a non-vital immature incisor with mineral trioxide aggregate (MTA)

Abstract  – A case of severe crown fracture and luxation in the upper permanent incisors of a 9-year-old boy is reported. The treatment of one of the injured teeth included apexification with calcium hydroxide and endodontic treatment with gutta-percha obturation. The other incisor was also treated with calcium hydroxide, but as there was no apical stop after 3 years of treatment, it was decided to use a new root-end filling material: mineral trioxide aggregate (MTA). At follow-up 12 months later, the tooth was asymptomatic and radiographically showed the initial repair of the radiolucent apical lesion.     

Marginal adaptation of mineral trioxide aggregate (MTA) compared with amalgam as a root-end filling material: a low-vacuum (LV) versus high-vacuum (HV) SEM study

AIM: To compare the marginal adaptation of mineral trioxide aggregate (MTA) or amalgam root-end fillings in extracted teeth under low-vacuum (LV) versus high-vacuum (HV) scanning electron microscope (SEM) viewing conditions. METHODOLOGY: Root-end fillings were placed in 20 extracted single-rooted maxillary teeth. Ten root ends were filled with MTA and the other 10 root ends were filled with amalgam. Two 1 mm thick transverse sections of each root-end filling were cut 0.50 mm (top) and 1.50 mm (bottom) from the apex. Gap size was recorded at eight fixed points along the dentine-filling material interface on each section when uncoated wet (LV wet (LVW)) and dry under LV (0.3 Torr) in a JEOL JSM-5800 SEM and backscatter emission (LV dry uncoated (LVDU)). The sections were then air-dried, gold-coated and gap size was recorded once again at the fixed points under HV (10(-6) Torr; HV dry coated (HVDC)). Specimen cracking, and the size and extent of the crack were noted. RESULTS: Gap sizes at fixed points were smallest under LVW and largest under HVDC SEM conditions. Gaps were smallest in MTA root-end fillings. A General Linear Models Analysis, with gap size as the dependent variable, showed significant effects for extent of crack in dentine, material and viewing condition (P = 0.0001). CONCLUSIONS: This study showed that MTA produced a superior marginal adaptation to amalgam, and that LVW conditions showed the lowest gap size. Gap size was influenced by the method of SEM viewing. If only HV SEM viewing conditions are used for MTA and amalgam root-end fillings, a correction factor of 3.5 and 2.2, respectively, may be used to enable relative comparisons of gap size to LVW conditions.     

MTA治疗成年患者根尖孔未闭合患牙的疗效评价

目的 评价无机三氧化聚合物（MTA）治疗成年患者根尖孔未闭合患牙的临床疗效。方法 选取成年患者根尖孔未闭合的前牙及前磨牙共41颗,随机分为2组,试验组21颗牙,在完成根管预备和消毒后,在手术显微镜下将MTA充填于根尖孔及根管下段,厚约3-5 mm,硬固后采用热牙胶完成根管中上段的充填;对照组20颗牙,采用氢氧化钙类根管糊剂Vitapex行根尖诱导成形术,定期复查,在根尖部有硬组织形成后完成根管治疗。记录患者就诊次数、治疗周期及治疗效果。结果 试验组术后X线片显示15颗患牙适充,6颗牙超充约0.5-2 mm,根管内充填物致密;平均就诊次数3.5次,平均治疗周期11.8 d,复查时多数患牙窦道闭合,根尖周病变明显缩小或消失,无新的暗影出现;对照组11颗患牙诱导成功,根尖有硬组织形成,9颗牙无明显根尖屏障形成,平均就诊次数6次,平均治疗周期306.8 d。结论 与根尖诱导成形术比较,MTA治疗成年患者根尖孔未闭合患牙的周期短,疗效好。