ProFile ProTaper镍钛根管器械与不锈钢K锉预备弯曲根管的比较研究

目的：比较ProFile镍钛机用根管器械，ProTaper镍钛手用根管器械和不锈钢K锉用于弯曲根管预备时的根管拉直和根尖偏移，为ProFile和ProTaper的临床应用提供实验依据。方法：将正畸前减数拔除的30个下颌第一前磨牙随机分为3组，分别用不锈钢K锉、ProTaper镍钛手用根管器械、ProFile镍钛机用根管器械做根管预备，分析评价其根管拉直和根尖偏移情况。结果：不锈钢K锉组的根管拉直、根尖偏移显著大于ProTaper和ProFile预备组。结论：ProFile和ProTaper镍钛根管预备器械与传统的不锈钢器械相比更适合弯曲根管的根管预备。     

ProTaper与不锈钢K锉预备弯曲根管的对比研究

目的：对比ProTaper镍钛手用根管器械和不锈钢K锉进行弯曲根管预备时的根尖偏移和根充后密度。方法：将正畸减数拔除的下颌第一前磨牙20个随机分为2组,每组10个。分别用不锈钢K锉、ProTaper镍钛手用根管器械做根管预备,对比分析并评价根尖偏移和根充后密度情况。结果：两组根管偏移发生率和根充密度存在显著性差异。结论：ProTaper镍钛根管预备器械与不锈钢器械相比更适合弯曲根管的预备。     

机用镍钛Hero642与不锈钢K锉预备弯曲根管的比较研究

目的:比较机用镍钛器械Hero642和手用不锈钢K锉对弯曲根管的预备效果。方法:随机选择有弯曲根管的患牙髓炎和尖周炎的前磨牙和磨牙80个,分别采用机用镍钛器械Hero642和手用不锈钢K锉进行根管预备,采用侧方加压充填,比较根管弯曲度的变化。结果:Hero642组平均减小1.85°,K锉组平均减小9.26°,二者之间有显著性差异(P<0.01)。结论:Hero642能够更好地保持根管的原始走向,并且并发症少。     

机用镍钛Hero642与不锈钢K锉预备弯曲根管的比较研究

目的比较机用镍钛器械Hero 642和手用不锈钢K锉对弯曲根管的预备效果.方法随机选择有弯曲根管的患牙髓炎和尖周炎的前磨牙和磨牙80个,分别采用机用镍钛器械Hero 642和手用不锈钢K锉进行根管预备,采用侧方加压充填,比较根管弯曲度的变化.结果Hero 642组平均减小1.85°,K锉组平均减小9.26°,二者之间有显著性差异(P＜0.01).结论Hero642能够更好地保持根管的原始走向,并且并发症少.     

机用镍钛器械预备弯曲根管的临床应用

目的　研究机用镍钛器械ProFile、ProTaper和Hero 642在弯曲根管预备中的临床应用。方法　选取有弯曲 根管的牙髓炎或根尖周炎患牙80颗,分为A、B、C、D 4组,分别用ProFile、ProTaper、Hero 642和不锈钢K锉预备根管, 全部患牙均采用侧向加压法充填根管。根据X线片评价根管预备和充填的效果。结果　3种机用镍钛器械均能很 好地维持根管的弯曲度和走向,根管的锥度和流畅度佳,无根管偏移、根尖阻塞、台阶形成等并发症发生;术后疼痛 发生少且程度轻;ProTaper的操作时间比ProFile和Hero 642短;有2例镍钛器械折断。结论　机用镍钛器械ProFile、 ProTaper和Hero 642预备弯曲根管成形效果好,极少有根管内并发症发生,ProTaper比ProFile和Hero 642更快速高 效;临床操作中须注意预防器械折断。     

机用镍钛Hero642预备磨牙弯曲根管的临床研究

目的探讨机用镍钛器械Hero642应用于磨牙弯曲根管预备的效果。方法选择根管弯曲的磨牙86颗,先采用小号K锉疏通根管,将根尖部预备至15号后,再以机用镍钛器械Hero642完成根管预备,侧向加压充填根管,根据治疗前后的x线片评价根管预备和充填效果。结果86颗磨牙共有274个根管,264个根管形态良好,无台阶、根尖堵塞、根管偏移及侧壁穿孔等并发症发生。根充恰填256个,8个根管超充,10个根管未能完全扩通,无法到达根尖孔而欠充或做塑化治疗。结论手用锉疏通弯曲根管的根尖段后再以机用镍钛器械Hero642完成根管预备,可获得良好的成形效果且较少产生并发症。     

两种镍钛机动器械根管预备的比较研究

目的:评价两种镍钛机动器械预备后牙弯曲根管的效果。方法:选择根管弯曲度10°~20°之间,及>25°的单根管前磨牙各24个,包埋于Branmante模型中。采用Hero642和Profile镍钛机动系统进行根管预备。测定根管预备前后根尖、根中、根冠段的牙本质切削面积、形态因子,并记录操作时间和器械折断情况。结果:Hero642对根尖段及重度弯曲根管根中段的牙本质切削大于Profile,在根管预备过程中体现出较短的操作时间和器械折断率;根管预备后的截面形态在两者间无显著差异。结论:Hero642和Profile镍钛机动系统具有良好的根管成形作用,较高的工作效率,可作为临床上弯曲根管的预备器械。     

弯曲根管不同预备方法对其根管充填密封性的影响

目的 研究临床常用预备方法预备弯曲根管对其根管充填密封性的影响.方法 选取不同弯曲程度的离体单根管牙齿90颗,分别使用不锈钢K锉,机用ProTaper,Hero642进行根管预备.AH-PLUS根充糊剂加牙胶尖冷侧压法充填,染料浸泡,分光光度法定量分析微渗漏.结果 不锈钢K锉组预备出的根管,充填后根尖孔微渗量最大,显著大于其余两种镍钛器械预备出的根管(P＜0.05).不同根管弯曲程度对根管充填后根尖孔产生微渗漏的影响程度不同,随着根管弯曲程度增加,发生根尖孔染料微渗量增加(P＜0.05);不锈钢K锉预备的Ⅲ°弯曲根管充填后出现的根管微渗量最大.结论 当使用冷侧压法充填根管,镍钛器械预备的根管相比不锈钢预备的根管更有利于根管充填后根尖孔的密封,尤其对于弯曲根管.     

倒敞法结合2 种机用镍钛锉预备重度弯曲后牙根管的应用研究

目的:评价倒敞法结合Hero 642和ProTaper机用镍钛锉预备重度弯曲后牙根管的疗效.方法: 随机将100 颗患牙髓炎或根尖周炎、最大根管弯曲度≥25°的后牙分为2 组,各50 例.实验组(A组)采用倒敞法,而对照组(B组)不采用倒敞法机械预备.A组以机用开口锉根管中上端敞开后,手用K锉预备根尖,再先用镍钛器械Hero 642,后用ProTaper预备根管;B组则直接应用Hero 642和ProTaper冠向下法预备根管. 2 组均用侧压法充填根管.根据X线片情况,预备时间,器械折断、疼痛等并发症,评价根管预备和充填的疗效,1 年随访率95%.结果:A组倒敞法结合Hero 642和ProTaper机用镍钛锉预备重度弯曲后牙根管,锥度、流畅度好,术后疼痛少且程度轻,无器械折断;而B组发生器械折断3 支(P>0.05);充填恰充率、欠充率、流畅度、术后疼痛两者有显著性差异(P<0.05).结论: 倒敞法结合Hero 642和ProTaper机用镍钛锉预备重度弯曲后牙根管,成形、根充效果好,并发症少,最大限度发挥了各自优点,是预备重度弯曲后牙根管值得推广应用的有效方法.     

不同根管器械预备弯曲根管的实验研究

目的比较手用不锈钢K锉、手用ProTaper锉、机用ProTaper锉在预备中、重度弯曲根管时的成形能力及其对根尖孔形态特征的影响。方法将40个树脂根管模型分为A、B、C、D组,A、B、C组各12个树脂根管模型,其中每组20°根管和30°根管各6个;D组4个树脂根管模型,均为小于5°根管。分别以手用不锈钢K锉、手用ProTaper锉、机用ProTaper锉预备根管,数码相机摄片,运用专业图像分析软件Auto-CAD比较根管偏移及根尖孔形态。结果B组中轴偏移明显高于A组和C组（P<0.05）,其中C组与A组在个别根管段有显著差异（P<0.05）。预备后根尖孔B组各项值均显著高于其他各组,B3组根管值显著高于B2组（P<0.05）。相同根管弯曲度下C组值高于A组;不同弯曲度下30°根管值高于20°根管值,但均无显著性差异（P>0.05）。结论两种镍钛器械均产生根管偏移,根管弯曲度是偏移产生的主要原因;与不锈钢器械相比,镍钛器械能较好地保持原根管走向及根尖孔形态。     

Canal preparation with Hero 642 rotary Ni-Ti instruments compared with stainless steel hand K-file assessed using computed tomography

AIM: To compare ex vivo root canal preparation with conventional stainless steel K-files and Hero 642 rotary Ni-Ti instruments. METHODOLOGY: Mesiobuccal canals of 20 maxillary first molars (with angles of curvature between 25 degrees and 35 degrees ) were used. After preparation with Hero 642 rotary instruments and stainless steel K-files, the amount of transportation that occurred was assessed using computed tomography. The teeth were scanned by computed tomography before instrumentation. One millimetre thick slices were prepared from the apical end point to the pulp chamber. The first two sections were 3 mm from the apical end of the root (apical level) and 3 mm below the orifice (coronal level). A further section (mid-root level) was recorded, dividing the distance between the sections of apical and coronal levels into two equal lengths. Ten teeth were instrumented using Hero 642 rotary instruments and another 10 teeth were instrumented using stainless steel K-files. Following the completion of the instrumentation, the teeth were again scanned and compared with the cross-sectional images taken prior to canal preparation. Amount of transportation and centreing ability was assessed. Student's t-test was used for statistical analysis. RESULTS: Less transportation occurred with Hero 642 rotary instruments than stainless steel K-files at the mid-root and coronal levels (mid-root: P < 0.05 and coronal: P < 0.001). Hero 642 rotary instruments had better centreing ability than K-files at all three levels (apical: P < 0.05, mid-root: P < 0.05 and coronal: P < 0.001). CONCLUSIONS: Hero 642 rotary instruments transported canals less, especially at the middle and coronal thirds of the root canals than stainless steel K-files. Hero 642 instruments had better centreing ability.     

Hero 642对弯曲根管根管成形能力的评价

目的：评价机用镍钛锉Hero 642预备弯曲根管时的根管成形能力。方法：利用自主研制的《牙齿模拟根管辅助分析测量系统》软件,定量检测8个模拟根管在用Hero 642以冠下法预备前后的形态变化,并进行统计学分析。结果：机用镍钛锉Hero 642能够很好地保持根管的原始弯曲度。在预备至0.02锥度25#銼和30#锉时,Hero 642对弯曲根管的各部位切割均衡,根管几何中心线基本不移位。结论：机用镍钛锉Hero 642具有良好的根管成形能力。对于高度弯曲的根管,预备主锉仍可选择0.02锥度30^#锉。     

Shaping ability of progressive versus constant taper instruments in simulated root canals

AIM: To compare the shaping ability of progressive versus constant taper shaft designed instruments in simulated root canals. METHODOLOGY: Simulated L- and S-shaped resin canals were prepared by ProTaper (progressive taper) and high elasticity in rotation 642 (Hero 642) (constant taper) instruments (n = 10 canals in each case). The pre- and post-instrumentation images were recorded and assessment of the canal shape was completed with image pro plus 5.0. The width of resin removed was measured at 9 measuring points. Incidence of canal aberrations, instrument fracture, preparation time and change of working length were recorded. In addition, the change of curvature and centring ability were also assessed. The data were analysed statistically using Student's t-test or Fisher's exact-test. RESULTS: In both canal types, Hero 642 instruments prepared canals more rapidly (P < 0.01) and maintained working length significantly more accurately than ProTaper instruments (P < 0.05). In canals prepared with Hero 642 instruments, there was less change in curvature. Instrumentation with ProTaper results in transportation towards the outer aspect of the L-shaped curved canals in the apical part and the inner aspect of the S-shaped canals at the curve. Hero 642 instruments had a better centring ability in the apical part of the canal, but resulted in shapes with a poor taper. CONCLUSIONS: ProTaper and Hero 642 instruments prepared curved canals rapidly, maintained working length well and were relatively safe without creating perforations and danger zones. In both canal types, Hero 642 instruments maintained the original canal curvature better, and had a better centring ability in curved canals because of its constant taper design. The taper prepared by Hero 642 instruments in the coronal part of the canal was generally poor.     

镍钛器械对中重度弯曲根管成形能力的临床研究

目的:探讨机动镍钛器械Hero642结合ProTaper SX对弯曲根管的成形能力及其临床应用方法。方法:选取有中、重度弯曲根管的牙髓炎及根尖周炎患牙42颗,采用机动镍钛器械Hero642结合ProTaper SX预备根管,侧向加压充填技术充填根管,根据治疗前后的X线片评价根管预备和充填效果。结果:所有患牙均无台阶、根管偏移及侧壁穿孔等并发症发生,弯曲根管的弯曲度和走向未改变,术后疼痛发生少,有1例器械折断。结论:Hero642结合ProTaper SX的预备方法对中重度弯曲根管的成形效果好,值得临床推广应用。     

两种根管再治疗镍钛器械去除椭圆形弯曲根管内充填物的效果评价

目的:评价2种根管再治疗镍钛器械去除椭圆形弯曲根管内充填物的效果。方法:离体的80颗根管呈椭圆形且弯曲的下颌前磨牙经Hero642预备、热牙胶垂直加压充填后随机分为4组,分别用ProTaper Universal、R-Endo、Hero642和手用H锉去除根充物,测量各组根充物的残留量百分比和操作时间。结果:4组样本均有根充物残留,ProTaper Universal、R-Endo和Hero642组根充物残留量百分比、操作时间均少于手用H锉组(P<0.01),前3组间的差异无统计学意义(P>0.05)。结论:ProTaper Universal、R-Endo机动镍钛器械对椭圆形弯曲根管内充填物的清除效果优于手用器械,且可减少操作时间,但仍不能彻底清除根充物。     

Shaping ability of Hero 642 rotary nickel-titanium instruments and stainless steel hand K-Flexofiles in simulated curved root canals

OBJECTIVE: The purpose of this study was to compare the shaping ability of Hero 642 rotary nickel-titanium instruments with that of stainless steel hand K-Flexofiles. STUDY DESIGN: Simulated 28 degrees and 35 degrees curved canals were prepared with Hero 642 instruments by using a crown-down preparation and with K-Flexofiles by using a reaming working motion (n = 24 canals in each case). All canals were sequentially prepared up to size 35. Preinstrumental and postinstrumental images were taken, and assessment of the canal shapes was completed with a computer image analysis program. Material removal was measured at 20 measuring points, beginning 1 mm away from the apex. In addition, preparation time, changes of working length, and instrument failures were recorded. RESULTS: In comparison with stainless steel K-Flexofiles, rotary Hero 642 instruments achieved better canal geometry and showed less canal transportation, both in canals with 28 degrees curves and in canals with 35 degrees curves. Three Hero instruments separated, whereas none of the K-Flexofiles separated. In 28 degrees curved canals, Hero instruments were significantly faster (P <.01) and maintained working distance significantly better (P <.05) than K-Flexofiles. These differences were insignificant in 35 degrees curved canals. CONCLUSION: Hero 642 instruments prepared curved canals rapidly, without change in working length and with only minimal transportation toward the outer aspect of the curve.     

Curved molar root canal preparations using Hero 642 rotary nickel–titanium instruments

AIM: The Bramante method was used to study how the natural curvature of root canals was modified when using the Hero 642 nickel-titanium rotary system. METHODOLOGY: Twenty-four canals were selected in freshly extracted human mandibular molars. Every root canal had an angle of curvature greater than 20 degrees. Roots were embedded in clear casting resin using a plaster mould. Cross-sectional cuts were made in the apical, middle and coronal thirds of each root. A first group (control) of 12 curved root canals was prepared using stainless steel hand instruments and the step-back technique. A second group of 12 curved root canals was instrumented using the Hero sequence according to the manufacturer's instructions. For each sectioning level, the amount of dentine removed, the change of shape factor and the canal centre displacement were calculated with the aid of a digital image analysis system. The results were subjected to the Mann-Whitney U-test. RESULTS: No significant difference occurred in the amount of dentine removed, change of shape factor or canal centre displacement in the coronal and middle thirds of the curved canals. In the apical third, transportation was significantly higher (P=0.0171) with stainless steel hand instruments than with the Hero system. CONCLUSIONS: The original canal shape was maintained better in the apical third of curved canals when using the Hero system in a crown-down technique when compared to a hand preparation technique with stainless steel instruments.     

两种机用镍钛根管预备器械预备"S"形树脂根管的效果观察

目的探讨两种镍钛根管预备器械（ProTaper与Hero642）预备“S”形树脂根管的成形效果。方法将30个“S”形树脂根管模型分为3组，分别使用机用ProTaper（A组）、Hero642（B组）及ProTaper联合Hero642（C组）预备根管。使用扫描仪扫描获取根管图像，使用计算机软件测量预备后根管内、外侧树脂去除量和根管宽度。结果对比相同型号的器械对根尖部弯曲内侧、根尖孔外侧壁树脂去除量，C组与A组差异有统计学意义（P〈0．05），C组对根管内外侧壁的预备较均匀，预备后的根管宽度从根管口到根尖逐渐减小，优于B组预备的根管锥度。结论ProTaper联合Hero642预备“S”形树脂根管时能在维持根管原形的基础上形成锥度良好的管形。