AIM: To study the root fracture resistance after root canal preparation with Ni-Ti rotary instruments and stainless hand instruments by means of meta-analysis.METHODS: Literature was researched in CNKI and CBMDisc, Pu...AIM: To study the root fracture resistance after root canal preparation with Ni-Ti rotary instruments and stainless hand instruments by means of meta-analysis.METHODS: Literature was researched in CNKI and CBMDisc, Pub Med, CALIS, Proquest, Web of Scienceand 11 kinds of Chinese or English dentistry journals. Retrieval time on Internet was in all years and hand retrieval time was from January 2013 to October 2013. The literatures were selected through reading abstracts and full texts by two reviewers independently and Revman 5 software was used to analysize the literature. RESULTS: Six articles met the inclusion criteria. According to Meta-analysis of tooth root bending properties, total standardized mean difference(SMD) was 0.63(95%CI:-0.24-1.50, P > 0.05). That indicated there was no statistically significant between the two groups. Subgroup analysis was carried out. SMD were 2.22(95%CI: 0.23-4.20, P < 0.05) and-0.61(95%CI:-1.05--0.17, P < 0.05) when the premolar teeth with a single canal or the mesiobuccal roots of molars were used as the materials for tests to compare the effects of different root canal preparation methods on root fracture resistance. That only indicated that there were statistically significant in two subgroups.CONCLUSION: In vitro experiments, the effects on the fracture resistance of root had no statistical difference with Ni-Ti rotary instruments and stainless steel hand instruments in root canal preparation.展开更多
The aim of this study was to analyze the specific influence of root canal anatomy on the accessibility of working length during root canal therapy. Four hundred seventy-six root canal therapy cases （amounting to a to...The aim of this study was to analyze the specific influence of root canal anatomy on the accessibility of working length during root canal therapy. Four hundred seventy-six root canal therapy cases （amounting to a total of 1 005 root canals） were examined. The anatomy risk factors assessed in each case included： tooth type （tooth location）, root canal curvature, and root canal calcification, as well as endodontic retreatment. The investigation examined the correlation between each of these anatomic factors and the working length, with statistical analysis consisting of Chi-square tests and multiple logistic regression analysis. In an independent factor analysis, tooth type （tooth iocation）, root canal curvature, canal calcification, and endodontic retreatment were determined to be the primary risk factors. In a multiple-factor regression model, root curvature and canal calcification were found to most significantly influence root canal working length accessibility （P〈0.05）. Root canal anatomy increases the difficulty of root canal preparation. Appropriate consideration of tooth anatomy will assist in accurate determination of preparation difficulty before instrumentation. This study alerts clinical therapists to anatomical factors influencing the working length accessibility, and allows for a direct estimate of success rate given in situ measurements of tooth factors during the root canal treatment procedure.展开更多
Summary： This study was aimed to evaluate the effectiveness of solution form of 17% ethylenediaminetetraacetic acid （EDTA） on removing smear layer of root canals at different exposure time periods and to provide sc...Summary： This study was aimed to evaluate the effectiveness of solution form of 17% ethylenediaminetetraacetic acid （EDTA） on removing smear layer of root canals at different exposure time periods and to provide scientific basis for EDTA as a choice of root canal irrigation in clinical practice. Twenty-five single-rooted teeth were randomly divided into 5 groups： control group （group A） was given 2.5% NaOC1, and 4 experimental groups were given 2.5% NaOC1 and 17% EDTA, including groups B, C, D and E with exposure time of 1, 3, 5 and 7 min, respectively. After preparation of the root canals, the teeth were split along their longitudinal axis, and the root sections were examined under scanning elec- tron microscope for evaluation of smear layer removal and erosion on the surface of the root canal walls. The specimens in group B showed presence of smear layer on the walls of the root canal with no statistical difference from that in group A （P〉0.05）. In groups C and D, partial removal of smear layer was obtained, and there was no significant difference between the two groups （P〉0.05）, but there was significant difference in removal of smear layer between group C and group B （P〈0.05）. Root canal walls in group E specimens showed almost complete removal of smear layer, and the removal of smear layer was significantly different from that in group D （P〈0.01）. There was no significant change in the structure of the surface of root canal for each sample. It was concluded that combined irrigation with 17% EDTA and 2.5% NaOC1 could remove the smear layer with no significant alteration in dentinal structure when the chelating agent was applied for 7 min. At 3 and 5 min of application, partial removal of smear layer was observed and at 1 min negligible removal of smear layer was achieved.展开更多
目的比较不同机用镍钛器械在后牙根管治疗中的临床应用效果。方法回顾性分析2021年1月至2021年6月于河南中医药大学第一附属医院口腔科行磨牙根管治疗的72例患者的临床资料,根据采用机用镍钛器械的不同分为A组、B组和C组各24例。所有患...目的比较不同机用镍钛器械在后牙根管治疗中的临床应用效果。方法回顾性分析2021年1月至2021年6月于河南中医药大学第一附属医院口腔科行磨牙根管治疗的72例患者的临床资料,根据采用机用镍钛器械的不同分为A组、B组和C组各24例。所有患者均接受后牙根管治疗,A组采用Wave One Gold机用镍钛器械治疗,B组采用Protaper Gold机用镍钛器械治疗,C组采用Protaper Universal机用镍钛器械治疗。比较三组每个根管预备时间、根管充填质量、临床疗效、牙根微裂情况及术后疼痛情况。结果A组患者的每个根管预备时间为(29.35±4.20)s,明显短于B组的(87.42±8.56)s和C组的(88.23±8.79)s,差异有统计学意义(P<0.05),但B组、C组患者的每个根管预备时间比较差异无统计学意义(P>0.05);A组、B组、C组患者的根管充填质量合格率分别为92.13%、96.47%、94.81%,治疗的总有效率分别为95.83%、91.67%、95.83%,牙根微裂发生率分别为4.17%、4.17%、8.33%,差异均无统计学意义(P>0.05);术后24 h内,三组患者的术后疼痛分级比较差异无统计学意义(P>0.05)。结论Wave One Gold、Protaper Universal、Protaper Gold机用镍钛器械在后牙根管治疗中疗效确切,相比于Wave One Gold,Protaper Universal、Protaper Gold的预备时间较长,且三者均不会明显增加牙根微裂发生率与术后疼痛程度。展开更多
文摘AIM: To study the root fracture resistance after root canal preparation with Ni-Ti rotary instruments and stainless hand instruments by means of meta-analysis.METHODS: Literature was researched in CNKI and CBMDisc, Pub Med, CALIS, Proquest, Web of Scienceand 11 kinds of Chinese or English dentistry journals. Retrieval time on Internet was in all years and hand retrieval time was from January 2013 to October 2013. The literatures were selected through reading abstracts and full texts by two reviewers independently and Revman 5 software was used to analysize the literature. RESULTS: Six articles met the inclusion criteria. According to Meta-analysis of tooth root bending properties, total standardized mean difference(SMD) was 0.63(95%CI:-0.24-1.50, P > 0.05). That indicated there was no statistically significant between the two groups. Subgroup analysis was carried out. SMD were 2.22(95%CI: 0.23-4.20, P < 0.05) and-0.61(95%CI:-1.05--0.17, P < 0.05) when the premolar teeth with a single canal or the mesiobuccal roots of molars were used as the materials for tests to compare the effects of different root canal preparation methods on root fracture resistance. That only indicated that there were statistically significant in two subgroups.CONCLUSION: In vitro experiments, the effects on the fracture resistance of root had no statistical difference with Ni-Ti rotary instruments and stainless steel hand instruments in root canal preparation.
基金supported by State Key Laboratory of Oral Diseases and Department of Endodontics and Operative Dentistry, West China School of Stomatology, Sichuan Universitysupported by the Key Clinical Program of the Ministry of Health of China (2010)National Key Clinical Program of China (2010)
文摘The aim of this study was to analyze the specific influence of root canal anatomy on the accessibility of working length during root canal therapy. Four hundred seventy-six root canal therapy cases （amounting to a total of 1 005 root canals） were examined. The anatomy risk factors assessed in each case included： tooth type （tooth location）, root canal curvature, and root canal calcification, as well as endodontic retreatment. The investigation examined the correlation between each of these anatomic factors and the working length, with statistical analysis consisting of Chi-square tests and multiple logistic regression analysis. In an independent factor analysis, tooth type （tooth iocation）, root canal curvature, canal calcification, and endodontic retreatment were determined to be the primary risk factors. In a multiple-factor regression model, root curvature and canal calcification were found to most significantly influence root canal working length accessibility （P〈0.05）. Root canal anatomy increases the difficulty of root canal preparation. Appropriate consideration of tooth anatomy will assist in accurate determination of preparation difficulty before instrumentation. This study alerts clinical therapists to anatomical factors influencing the working length accessibility, and allows for a direct estimate of success rate given in situ measurements of tooth factors during the root canal treatment procedure.
基金supported by the Fundamental Research Funds for the Central Universities,China(No.2010JC030)
文摘Summary： This study was aimed to evaluate the effectiveness of solution form of 17% ethylenediaminetetraacetic acid （EDTA） on removing smear layer of root canals at different exposure time periods and to provide scientific basis for EDTA as a choice of root canal irrigation in clinical practice. Twenty-five single-rooted teeth were randomly divided into 5 groups： control group （group A） was given 2.5% NaOC1, and 4 experimental groups were given 2.5% NaOC1 and 17% EDTA, including groups B, C, D and E with exposure time of 1, 3, 5 and 7 min, respectively. After preparation of the root canals, the teeth were split along their longitudinal axis, and the root sections were examined under scanning elec- tron microscope for evaluation of smear layer removal and erosion on the surface of the root canal walls. The specimens in group B showed presence of smear layer on the walls of the root canal with no statistical difference from that in group A （P〉0.05）. In groups C and D, partial removal of smear layer was obtained, and there was no significant difference between the two groups （P〉0.05）, but there was significant difference in removal of smear layer between group C and group B （P〈0.05）. Root canal walls in group E specimens showed almost complete removal of smear layer, and the removal of smear layer was significantly different from that in group D （P〈0.01）. There was no significant change in the structure of the surface of root canal for each sample. It was concluded that combined irrigation with 17% EDTA and 2.5% NaOC1 could remove the smear layer with no significant alteration in dentinal structure when the chelating agent was applied for 7 min. At 3 and 5 min of application, partial removal of smear layer was observed and at 1 min negligible removal of smear layer was achieved.
文摘目的比较不同机用镍钛器械在后牙根管治疗中的临床应用效果。方法回顾性分析2021年1月至2021年6月于河南中医药大学第一附属医院口腔科行磨牙根管治疗的72例患者的临床资料,根据采用机用镍钛器械的不同分为A组、B组和C组各24例。所有患者均接受后牙根管治疗,A组采用Wave One Gold机用镍钛器械治疗,B组采用Protaper Gold机用镍钛器械治疗,C组采用Protaper Universal机用镍钛器械治疗。比较三组每个根管预备时间、根管充填质量、临床疗效、牙根微裂情况及术后疼痛情况。结果A组患者的每个根管预备时间为(29.35±4.20)s,明显短于B组的(87.42±8.56)s和C组的(88.23±8.79)s,差异有统计学意义(P<0.05),但B组、C组患者的每个根管预备时间比较差异无统计学意义(P>0.05);A组、B组、C组患者的根管充填质量合格率分别为92.13%、96.47%、94.81%,治疗的总有效率分别为95.83%、91.67%、95.83%,牙根微裂发生率分别为4.17%、4.17%、8.33%,差异均无统计学意义(P>0.05);术后24 h内,三组患者的术后疼痛分级比较差异无统计学意义(P>0.05)。结论Wave One Gold、Protaper Universal、Protaper Gold机用镍钛器械在后牙根管治疗中疗效确切,相比于Wave One Gold,Protaper Universal、Protaper Gold的预备时间较长,且三者均不会明显增加牙根微裂发生率与术后疼痛程度。
