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
We studied whether obturing canals and restoring endodontic occlusal access cavities on upper premolars could provide acceptable resistance and pattern to fracture.Eighteen upper premolars were divided equally into 3 ...We studied whether obturing canals and restoring endodontic occlusal access cavities on upper premolars could provide acceptable resistance and pattern to fracture.Eighteen upper premolars were divided equally into 3 groups.Group 1 consisted of intact controls;group 2 had access cavities and root canal preparations;group 3 as in group 2 but obturated with gutta-percha and AH26,and the access cavity restored with glass ionomer and composite.Specimens were submitted to compressive strength testing using the Hounsfield Universal H50KM testing machine with a load cell of 2000 Newtons and a crosshead speed set at 1.0 mm/min until fracture.The results from the compressive strength tests showed that intact controls （1105.83±90.93 MPa） and restored premolars （936.67±44.67 MPa） were significantly different from premolars with unrestored access cavities 568.33±105.49 MPa.There was no significant difference between intact controls and restored premolars.The predominant fracture pattern for intact teeth was an oblique fracture.For premolars that had endodontic access cavities,restored or unrestored,the most common fracture pattern was a vertical fracture.The restoration of occlusal access cavities with glass ionomer and composite provided fracture resistance close to that of intact controls,but when restored teeth fractured,they were predominantly non-restorable.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
目的研究根管预备、充填及纤维桩预备对根管壁微裂产生的影响。方法收集150颗离体前磨牙,并随机分为四个大组[1组(n=10)、2组(n=20)、3组(n=40)、4组(n=80)]及15个小组(1组,2组25#、2组40#,3组A25#、3组B25#、3组A40#、3组B40#,4组AX25#...目的研究根管预备、充填及纤维桩预备对根管壁微裂产生的影响。方法收集150颗离体前磨牙,并随机分为四个大组[1组(n=10)、2组(n=20)、3组(n=40)、4组(n=80)]及15个小组(1组,2组25#、2组40#,3组A25#、3组B25#、3组A40#、3组B40#,4组AX25#、4组AX40#、4组AT25#、4组AT40#、4组BX25#、4组BX40#、4组BT25#、4组BT40#,n=10)。1组:即对照组,不进行预备;2组:均分为两组,一组预备至WaveOne25#,另一组预备则预备至40#;3组:将样本与2组一样进行分组预备,之后进一步分为2个小组,进行冷牙胶侧压充填(A)及热牙胶连续波充填(B);4组:将样本与3组一样进行分组预备及充填,之后将不同方法充填后的样本进一步分为2小组进行RelyXTM(X)和RTD(T)纤维桩预备。将所有的样本从距离根尖3、5、7 mm处垂直于牙体长轴截断,在显微镜下观察微裂发生情况,并进行比较分析。结果1组及2组中均并未有裂纹存在。充填后,3组A与3组B的裂纹数目比较差异无统计学意义(P>0.05)。置入纤维桩后,4组A的牙本质裂纹明显较4组B多,且差异具有统计学意义(22/120 VS 10/120,P<0.05)。在与根尖距离7 mm处,相较于RelyXTM纤维桩,RTD纤维桩预备后牙本质产生更多裂纹,差异具有统计学意义(9/120 VS 23/120,P<0.05)。4组的裂纹总发生率高于1组、2组、3组(P<0.05),说明纤维桩置入后,牙本质裂纹较仅进行牙体预备和充填明显增多。结论纤维桩的预备主要导致根管壁裂纹的产生,冷侧压充填后进行纤维桩预备比热牙胶充填后进行桩体预备更容易产生根管壁裂纹。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We studied whether obturing canals and restoring endodontic occlusal access cavities on upper premolars could provide acceptable resistance and pattern to fracture.Eighteen upper premolars were divided equally into 3 groups.Group 1 consisted of intact controls;group 2 had access cavities and root canal preparations;group 3 as in group 2 but obturated with gutta-percha and AH26,and the access cavity restored with glass ionomer and composite.Specimens were submitted to compressive strength testing using the Hounsfield Universal H50KM testing machine with a load cell of 2000 Newtons and a crosshead speed set at 1.0 mm/min until fracture.The results from the compressive strength tests showed that intact controls （1105.83±90.93 MPa） and restored premolars （936.67±44.67 MPa） were significantly different from premolars with unrestored access cavities 568.33±105.49 MPa.There was no significant difference between intact controls and restored premolars.The predominant fracture pattern for intact teeth was an oblique fracture.For premolars that had endodontic access cavities,restored or unrestored,the most common fracture pattern was a vertical fracture.The restoration of occlusal access cavities with glass ionomer and composite provided fracture resistance close to that of intact controls,but when restored teeth fractured,they were predominantly non-restorable.
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。
文摘目的研究根管预备、充填及纤维桩预备对根管壁微裂产生的影响。方法收集150颗离体前磨牙,并随机分为四个大组[1组(n=10)、2组(n=20)、3组(n=40)、4组(n=80)]及15个小组(1组,2组25#、2组40#,3组A25#、3组B25#、3组A40#、3组B40#,4组AX25#、4组AX40#、4组AT25#、4组AT40#、4组BX25#、4组BX40#、4组BT25#、4组BT40#,n=10)。1组:即对照组,不进行预备;2组:均分为两组,一组预备至WaveOne25#,另一组预备则预备至40#;3组:将样本与2组一样进行分组预备,之后进一步分为2个小组,进行冷牙胶侧压充填(A)及热牙胶连续波充填(B);4组:将样本与3组一样进行分组预备及充填,之后将不同方法充填后的样本进一步分为2小组进行RelyXTM(X)和RTD(T)纤维桩预备。将所有的样本从距离根尖3、5、7 mm处垂直于牙体长轴截断,在显微镜下观察微裂发生情况,并进行比较分析。结果1组及2组中均并未有裂纹存在。充填后,3组A与3组B的裂纹数目比较差异无统计学意义(P>0.05)。置入纤维桩后,4组A的牙本质裂纹明显较4组B多,且差异具有统计学意义(22/120 VS 10/120,P<0.05)。在与根尖距离7 mm处,相较于RelyXTM纤维桩,RTD纤维桩预备后牙本质产生更多裂纹,差异具有统计学意义(9/120 VS 23/120,P<0.05)。4组的裂纹总发生率高于1组、2组、3组(P<0.05),说明纤维桩置入后,牙本质裂纹较仅进行牙体预备和充填明显增多。结论纤维桩的预备主要导致根管壁裂纹的产生,冷侧压充填后进行纤维桩预备比热牙胶充填后进行桩体预备更容易产生根管壁裂纹。
