整体铸造和分瓣铸造桩核冠修复的临床对比观察

目的　比较整体铸造和分瓣铸造桩核冠修复后牙严重缺损的临床效果。方法　对 5 1颗经过完善根管充填后的严重缺损的后牙 ,35颗进行整体铸造桩核冠修复 ,16颗进行分瓣铸造桩核冠修复 ,并随访观察 2～ 3年。结果　两组桩核冠修复的临床效果无显著性差异 (P >0 .0 5 )。结论　整体铸造和分瓣铸造桩核冠用于修复后牙严重缺损均可取得良好的临床效果     

插销式和分瓣式铸造桩核冠修复的临床研究

我们在临床上采用插销式和分瓣式铸造桩核冠对严重缺损的后牙进行修复治疗,取得满意效果,现报告如下.     

纤维桩与插销桩修复磨牙严重缺损的临床研究

目的比较2种桩核材料用于磨牙严重缺损的修复效果。方法80颗磨牙缺损患牙随机分为2组,分别进行玻璃纤维桩核冠修复和铸造插销式分体桩核冠修复,2年后对修复效果进行评价。结果玻璃纤维桩组出现1颗冠折;插销式分体桩组所有患牙均未出现冠松动脱落、冠桩脱落、冠折、根折、桩折,2组差异无统计学意义(P<0.05)。结论对于磨严重牙缺损患者,选用玻璃纤维桩核冠修复或铸造插销式桩核冠修复均可,但对于缺损严重合并牙根条件差的患牙,选用玻璃纤维桩需慎重。     

新型内插销式桩核冠应用于咬合过紧患者残根修复的临床研究

目的:评价新型内插销式桩核冠应用于深覆伴重度牙体缺损患者的修复疗效。方法:随机选择深覆患者36颗磨牙残冠,采用新型内插销式桩核冠固定义齿修复经过4年临床随访,观察其在深覆伴重度牙体缺损患者的应用效果。结果:新型内插销式桩核冠固定义齿保存了重度牙体缺损患者的残根残冠,有效提高咀嚼效率。结论:新型内插销式桩核冠固定义在深覆患者重度牙体缺损修复方面具有独特优势。     

单根管与多根管铸造桩核用于磨牙残冠修复的比较研究

目的比较单根管与多根管铸造桩核冠修复磨牙残冠的临床效果。方法选择140例患者的153颗磨牙残冠,在修复前行完善的根管治疗,其中92颗采用单根管整体铸造桩核冠修复,61颗采用插销式铸造的多根管桩核冠修复。对修复后两年的复查结果进行临床效果评价。结果单根管固位修复体桩核松动1个,其余桩核X线片显示桩核与根管结合紧密,修复效果良好。多根管分体插销式铸造桩核冠无松动。修复的临床效果无显著性差异(P>0.05)。结论采用单根管铸造桩核修复磨牙残冠不仅制作简单,而且与多根管分体桩核修复无显著性差异,同样可取得良好的临床效果。     

平行与层叠铸造分瓣桩核冠修复的临床对比观察

目的：比较平行与层叠铸造分瓣桩核冠修复牙冠大部分缺损的恒磨牙,并观察比较两种桩核冠临床修复的效果。方法：对52颗经过完善根管治疗的大面积缺损的磨牙,均采用铸造分瓣桩核冠,其中27颗采用平行分瓣桩核冠修复,25颗采用层叠分瓣桩核冠修复,随访3年。结果：平行分瓣桩核冠修复与层叠分瓣桩核冠修复方法的成功率依次是96.3%和92.0%,两组之间经χ2检验,无显著性差异。结论：采用平行分瓣桩核冠和层叠分瓣桩核冠修复牙冠大部分缺损的磨牙,均可取得良好的临床效果。     

磨牙插销式铸造桩核修复的临床研究

目的研究插销式铸造桩核修复磨牙残根、残冠的效果。方法对36颗磨牙进行插销式铸造桩核修复。结果36颗磨牙经1年的随访,修复效果好。结论插销式铸造桩核修复磨牙残根、残冠的多根具有较好的临床效果。     

后牙残根残冠的利用与修复

目的探讨后牙残根残冠修复的临床效果。方法对185例210颗后牙残根残冠经过完善的根管治疗后进行铸造桩核修复,再根据缺牙情况作为全冠或者固定桥,附着体、套筒冠的基牙利用,临床观察2年。结果185例210颗患牙修复后成功202颗,失败8颗,成功率96.1%。结论经过完善的根管治疗后铸造桩核冠修复可使后牙残根残冠得以保留并发挥功能。     

直接法与间接法分瓣桩核冠修复磨牙的临床观察

目的:观察直接法与间接法制作分瓣桩核冠修复严重缺损磨牙的临床效果。方法:对42颗经过完善根管充填后的严重缺损的磨牙,19颗行间接法制作分瓣桩冠修复,23颗行直接法制作分瓣桩核修复,并随访3年。结果:两组桩核冠修复的临床效果无显著性差异(P>0.05)。结论:直接法与间接法制作分瓣桩核冠修复严重缺损磨牙均可取得良好的临床效果。     

插销式铸造分体桩核冠修复磨牙残根的临床观察

目的评价插销式铸造分体桩核在磨牙残根金属烤瓷冠修复中的作用。方法选择38例患者51颗磨牙残根,行完善根管治疗后,用寒天琼脂、藻酸盐联合制取根管印模间接法制作插销式分体铸造桩核,并进行金属烤瓷冠修复。结果经3年临床观察,成功48颗(96%),失败2颗(4%),1颗为根折裂,1颗为牙周袋形成。结论适应证的选择及牙体预备和根管印模技术是插销式分体铸造桩核烤瓷冠治疗成功的关键。     

老年人后牙残根残冠的铸造桩核冠修复

目的:本文旨在探寻和评价老年人后牙残根残冠的铸造桩核冠修复的临床效果.方法:对老年人可保留的后牙残根残冠,经过完善的根管治疗以后进行牙体预备,取印模、灌制模型,制作铸造桩核(多根牙时,加斜插式移动钉),临床粘结.在铸造桩核上进行全冠制备,取印模,完成全冠的制作,临床试戴、抛光、粘结,完成桩核冠修复.结果:1～3年随访观察,铸造桩核冠与牙体组织密合度良好,修复体无松动,冠周牙龈未见异常反应,X线片示无可见继发龋.结论:铸造桩核冠可以视为一种有效的方法,修复老年人残根残冠,以维持他们的正常咀嚼功能和口腔健康.     

分体栓道式铸造桩核在磨牙残冠残根中的应用

目的：观察分体栓道式铸造桩核在磨牙残冠残根修复中的作用。方法：选择牙根分叉较大的磨牙残冠残根，经完善根管充填后，制作分体栓道式铸造桩核，然后精密铸造金属全冠修复。结果：随诊120例128颗牙，观察时间最短6个月，最长8年，冠无松动、固位好，能够承受正常咬合力，行使正常咀嚼功能。无发生根管折裂，患无明显不适感。结论：该方法能减少患牙的拔除率，提高了残冠残根的远期临床效果。     

两种桩核冠修复磨牙残根的临床观察

目的:观察分瓣铸造桩核冠和成品螺纹桩树脂核冠在磨牙残根修复中的效果。方法:对69例严重缺损的磨牙,32例进行分瓣铸造桩核冠修复(A组),37例进行螺纹桩树脂核冠修复(B组),术后对其中61例残根随访2~3年。结果:54例使用良好(A组26例,B组28例),A组和B组的成功率分别为86%和90%,总成功率为88.5%。结论:两种桩核冠用于磨牙残根修复均可取得良好的临床效果。     

完全性斜折牙修复的临床疗效分析

目的：探讨3种完全性斜折裂牙修复的最佳治疗方式。方法：对128例龈上冠折、齐龈冠折、龈下冠根折患牙,视牙体缺损分别行全冠、铸造桩核冠、预成桩核冠修复,观察3种折裂类型的修复效果。结果：龈上冠折修复成功率为96．7％,齐龈冠折成功率为90．5％,龈下冠根折为69．6％。对于龈下冠根折,用预成桩树脂核成功率为84．6％,铸造桩核成功率为57．1％。结论：龈上冠折和齐龈冠折修复效果优于龈下冠根折,对龈下冠根折用预成桩树脂核比铸造桩核成功率要高。全冠修复完全性斜折裂牙是保存牙齿的有效方法。     

Effects of post-core design and ferrule on fracture resistance of endodontically treated maxillary central incisors

STATEMENT OF PROBLEM: Studies concerning the effects of post-core design and ferrule on the fracture resistance of endodontically treated teeth remain controversial. PURPOSE: The purpose of this study was to investigate in vitro the effects of post-core design and ferrule on the fracture resistance of root canal treated human maxillary central incisors restored with metal ceramic crowns. MATERIAL AND METHODS: Forty-eight extracted human maxillary central incisors were endodontically treated and divided into 4 groups of 12. The following treatments were evaluated: group A: restored with metal ceramic (porcelain fused to metal [PFM]) crowns as control; group B: 2-mm ferrule/custom cast post-core/PFM crowns; group C: no ferrule/custom cast post-core/PFM crowns; and group D: 2-mm ferrule/prefabricated post and resin core/PFM crowns. Each specimen was subjected to load (N) on the lingual surface at a 135-degree angle to the long axis with a MTS 810 material testing machine until fracture at a crosshead speed of 0.02 cm/min. One-way analysis of variance and nonparametric chi-square test were used to compare the results. A significant analysis of variance result was followed by Newman-Keuls pairwise multiple comparisons (P<.05). RESULTS: There were significant differences among the 4 groups studied (P<.01). Group B had the highest fracture strength (1793.59 +/- 387.93 N). There was no significant difference among the fracture resistances of the other 3 groups (group A: 958.49 +/- 286.02 N; group C: 992.98 +/- 291.00 N; group D: 994.94 +/- 285.04 N). CONCLUSION: Within the limitations of this study, not all of the post-core structures tested improved the strength of the endodontically treated teeth. Those prepared with a 2-mm dentin ferrule more effectively enhanced the fracture strength of custom cast post-core restored endodontically treated maxillary central incisors.     

Fracture resistance of pulpless teeth restored with post-cores and crowns.

OBJECTIVES: The present study was designed to test the null hypothesis that there is no difference in the fracture resistance of pulpless teeth restored with different types of post-core systems and full coverage crowns. METHODS: Extracted human upper premolars were restored with a fiber post, prefabricated metallic post or cast metallic post-core. Teeth with full crown preparations without post-core restorations served as a control. All teeth were restored with full coverage crowns. A 90-degree vertical or 45-degree oblique load was applied to the restored teeth with a crosshead speed of 0.5 mm/min, and the fracture loads and mode of fracture were recorded. RESULTS: Under the condition of vertical loading, the fracture load of teeth restored with the cast metallic post-cores was greatest among the groups (two-factor factorial ANOVA and Scheffe's F test, P<0.05). All fractures in teeth restored with all types of post-core systems propagated in the middle portions of roots, including the apices of the posts. Under the condition of oblique loading, the fracture load of teeth restored with pre-fabricated metallic posts was significantly smaller than that in other groups. Two-thirds of fractures in the fiber post group propagated within the cervical area, while most fractures in other groups extended beyond the middle of the roots. SIGNIFICANCE: From the results of the present investigations, it was concluded that under the conditions of vertical and oblique loadings, the combination of a fiber post and composite resin core with a full cast crown is most protective of the remaining tooth structure.     

老年患者后牙残根残冠的保存与修复治疗

目的:研究老年患者后牙残根残冠行桩核全冠修复的效果.方法:对103例60岁以上老人的174颗后牙残根残冠进行根充治疗,制作桩核后行金瓷或金属全冠修复,对修复体的卫生、使用情况及基牙牙周健康状况进行为期5年的随访观察.结果:发现3颗全冠和2颗桩核脱落,6颗基牙因松动拔除,13颗基牙出现较重的牙周炎症,4颗基牙发生根面龋,另有4颗基牙动度明显增加,93%的义齿使用良好.结论:后牙桩核全冠修复,不仅能恢复口腔功能,可促进老年患者的健康.但口腔卫生至关重要.     

磨牙牙体缺损桩核冠与全冠修复的应力对比研究

目的对比分析磨牙牙体大面积缺损桩核冠和全冠修复后,存留牙体组织的应力状况,为磨牙牙体缺损的修复设计提供参考。方法分别建立上下颌磨牙大面积缺损桩核冠修复和牙体充填后全冠修复2种修复方式的三维有限元分析模型,模拟牙齿在咀嚼过程的受力情况,计算分析上述2种修复状况下,存留牙体组织的应力分布状况。结果磨牙桩核冠修复后应力集中区在根管口和牙颈部;全冠修复后,应力集中在牙颈部,全冠修复后牙颈部的最大应力小于桩核冠修复后根管口的最大应力。结论磨牙大面积缺损修复时,若牙体预备后存留壁厚度不小于1.5mm,全冠修复较桩核冠修复更有利于利用牙齿固有结构保存存留牙体组织的抗力性。     

三种桩核系统修复后牙体组织抗折裂强度的体外实验研究

目的:比较纤维根管桩核系统和金属铸造桩核修复后牙体组织的抗折裂强度和折裂模式。方法:对30个离体上颌中切牙进行常规根管治疗后截除牙冠，分别用AESTHETI—PLUS纤维桩核系统、C—POST纤维桩核系统、Cr-Co铸造金属桩核进行桩核及烤瓷冠恢复外形，包埋于底座后在INSTRON测试仪上进行抗折裂强度的测试，记录试件折裂时测试机上的读数以及试件折裂的模式，应用SPSS软件进行统计分析。结果:三种桩核系统修复后的牙体组织抗折裂强度均能达到临床要求，AESTHETI—PLUS纤维桩核修复后牙体抗折裂强度高于C—POST纤维桩核系统和Cr-Co铸造金属桩核系统，后两者之间无显著差异；AESTHETI—PLUS纤维桩核和C—POST。纤维桩核系统修复后牙体的折裂模式与Cr-Co铸造金属桩核有明显的差异。结论:AESTHETI—PLUS纤维桩核系统和C—POST纤维桩核系统具有一定的临床应用前景，但其机械性能仍需进行进一步研究。