尖牙

AIM:To determine the efficiency of surgical o perating microscopein locating the se- cond mesiobuccal canal of perm anent upper first molar.

上颌第一恒磨牙在口腔内萌出较早，其龋病和尖周病的发病率较高，然而有资料统计其根管治疗的成功率较低。

Values o f main apical stress in Angle II1 were generally higher than those of normal oc cl usion.

结果：正常牙合各牙根尖主应力方向基本均偏向远中舌侧，安氏Ⅱ类则更偏向远中颊侧。

Root canal therapy is the basic and most optimal curing method of pulp diseases and apical diseases.

根管治疗术是牙髓病和根尖周病的基本治疗方法和最佳选择。

Methods A modified Bramante muffle was used and 22 chinese mandibular second molars with Cshaped root or seperated roots were sectioned into four pieces perpendicularly distance from apex to 3,3.5,8 mm,respectively.The crosssectional anatomical morphology was observed and the minimum root canal wall thickness of each section was measured.

使用改良Branmante体外模型，将具有C形牙根或两个独立牙根中国人下颌第二恒磨牙各22颗，在距根尖3，5.5，8 mm处将样本锯为四段，观察C形根管横断面形态，测量断面最小根管壁厚度。

Objective To observe Calcium Hydr Oxide Paste and Formo Cresol on the disinfection effects of infected root canals.

根管治疗是目前国际公认的治疗牙髓病和根尖周病的首选方法。

Objective:Analyzes two kind of roots to be sufficient cataplasm to the young permanent teeth root point induction forming curative effect.

目的：分析两种根充糊剂对年轻恒牙的根尖诱导成形疗效。

Compared with most other jurisdictions, English courts are not just wife-friendly but sharp-toothed and clear-sighted.

与其它大多数国家的司法部门相比，英国的法院并不仅限于倾向妻子一方，他们还牙尖嘴利，目光如炬。

Based on the present histological and previous molecular biological studies, the special structure at the apical end is obviously different from the cervical loop giving rise to Hertwig's epithelial root sheath, in human, mouse and rat molar tooth germs.

作者所作的组织学和分子生物学实验结果表明，人类、大鼠及小鼠磨牙牙胚中这种根尖末端特殊的结构与颈环区Hertwig上皮根鞘结构明显不同。

Objective To evaluate clinical effect of the handling ProTaper Nickel-titanium rotary instruments in preparation of canals of posterior teeth.Methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling ProTaper rotary instruments using step-down technique,and by K files using step-back technique for control.All teeth were obturated with lateral condensation methods.The efficiency of preparation was analyzed with ra-diographs before and after operation.

目的 评价手用ProTaper预备后牙根管的临床效果方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用ProTaper 锥度镍钛旋转器械逐步伸入法预备根管，对照组用K锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗后的X线片，评价后牙根管预备效果。

Methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling ProTaper rotary instruments using step-down technique,and by K files using step-back technique for control.All teeth were obturated with lateral condensation methods.The efficiency of preparation was analyzed with ra-diographs before and after operation.

选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用ProTaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用K锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的X线片，评价后牙根管预备效果。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。