牙列

Three cross-sections were made through crown and gingiva of the model tooth. Curve functions of axial buccal crown and gingiva contour of each section were acquired by means of curve fitting, and the angle of emergence pofile was calculated, which represents the degree of undercut.

以下颌第二前磨牙为研究对象，在牙列模型上通过牙冠部、牙龈作3个纵断面，用曲线拟和的方法得到每个断面的牙齿轴面外形及相应牙龈外形的曲线方程，以此分析两者之间的关系并计算牙冠起始外形角度，即倒凹程度的大小。

Results:In normal occlusion,the size of cuspid and bicuspid group was correlated with that of mandibular incisor group in accord with the principle of Moyers prediction.

结果：正常的尖牙、双尖牙组与下切牙组高度相关，符合Moyers预测机理，但错的尖牙、双尖牙组一般与同牙列的切牙加第一磨牙组高度正相关。

Results The incidence of wedge-shaped defects reached 97.3 %,and the frequency of involved teeth was:first premolar,second premolar,first molar,cuspid.

结果 该组老年人楔状缺损的发病率为97 。3 %，且随年龄递增；楔状缺损的好发部位和缺损程度第一双尖牙列首位，其次为第二双尖牙，第一磨牙；其中第一磨牙比以往人们认为的尖牙更好发楔状缺损。

Objective To study the effects of environmental and genetic factors on dental crowding, and to further study on the influencing factors on permanent dentition.

目的 通过双生子研究遗传和环境因素对恒牙列拥挤形成所起的作用，以进一步研究恒牙列拥挤的影响因素。

The BLB implant system is suitable for the defect of denture or the edentulous jaw in the clinics.

BLB种植体植入后骨整合形成良好，适合于常见的牙列缺损及牙列缺失的种植修复，是一种较理想的种植体。

ABSTRACT:OBJECTIVETo study the correlation between anatomic structure of the inferior alveolar nerve canal and dental implantation by measuring mandible innervation esemplarsMETHODS The intramandibular course of mandibular canal and its dimendion were measured in 15 mandibles with teeth; the relationship between blood vessel and nerve was observed in 5 fresh samples in which the artery was filled; and then the data were analyzed by statisticsRESULTSThe mandibular canal was close to the lingual side and the inferior margin of the mandible, the mandibular canal and the 10mm underside of mandible were parallel in the region of the first and the second molars, it runned outboard to genal aperture when it was hereabout genal aperture, and the blood vessel lay above nerve in the mandibular canalCONCLUSIONIn implant operation performed according to normal anatomy, injury to inferior alveolar nerve may be avoided.

［目的］探讨下颌管的解剖结构与牙种植的关系［方法］选取15具牙列完整的成人离体下颌骨标本和5具经过动脉血管内灌注的新鲜标本，测量下颌骨在每个牙位截面上有关牙槽嵴及下颌管的相关数据，进行统计学分析［结果］牙槽嵴顶以及下方10mm宽度由前向后逐渐增宽；牙槽嵴由上向下逐渐增宽；下颌管位于下颌骨体内下方走行中偏舌侧，并近下颌骨下缘，在下颌第1，2磨牙区下颌管走行与下颌下缘成平行状，在近颏孔处转向外和向颊侧出颏孔；下颌管内血管位于下牙槽神经之上［结论］牙种植术中按正常解剖部位并且侧重颊侧骨板操作，可避免损伤下牙槽神经；如果术中下颌管内突然涌出大量新鲜血液，则提示若继续手术可能损伤下牙槽神经。

Because this produces peculiar tooth jaw face to misshape, constant expression is mid development undesirable reach cave, length of direction of around of bone of the upper jaw and perpendicular direction height shorten, tooth bend is narrow, the tooth lists jam, occlusive relation is disorder, anterior teeth or complete tooth bend are enclothed instead, before mandible true sex or false sex dash forward. 2 use DO method at the back of art of Jiao Zhi cleft palate in the portion caves at the back of art of abnormal cleft palate in the portion caves abnormal treatment method is very much, if Kettle reports block is mental,raise fight a way, the face guard method that Tind Lund uses, wang Ketao [1] uses Peng body to get together 4 fluorine ethylene fills up repair misshapes this kind etc.

因此产生特有的牙颌面畸形，常表现为面中部发育不良及凹陷，上颌骨前后方向长度及垂直方向高度变短，牙弓狭窄，牙列拥挤，咬合关系紊乱，前牙或全牙弓反覆盖，下颌真性或假性前突。2利用DO术矫治腭裂术后面中份凹陷畸形腭裂术后面中份凹陷畸形治疗方法很多，如Kettle报道枕颏支抗法，Tind lund采用的面罩法，王克涛[1]采用膨体聚四氟乙烯充填修复此类畸形等。

Objective We provided the reference for diagnoses in Othodontics of total dental space analysis. Method This study randomly collected 140 Chinese students(60 male, 80 female) who were from eithteen to twenty five years old with third molars completely erupted.

正畸诊断和治疗应考虑全牙齿及其周围环境的影响，解除牙列中各个区域的牙量骨量不调，但目前国内正畸医师在错畸形的诊断、治疗中，比较注重牙弓前、中段的牙量骨量分析，却忽略了牙弓后段的分析[1] 。

Objective: Dentition defect is commonly seen in prosthetic dentistry. Understanding the stress state of the intraoral tissues and dentures is important for designing of the denture.

目的：牙列缺损是口腔修复科常见的疾病之一，了解牙列缺损及缺损修复后口腔内各组织及义齿的受力状况，有助于进行合理的修复设计。

Clinical medium usually run into some serious tooths week the tooth row of patient's defection and damage, its artificial teeth repairs an opposite difficulty, can choose a cone form set tube hat artificial teeth, even if tooth week blaze a patient the tooth row only remain 1~5 natural tooths, can also repair.

临床中常常碰到一些严重的牙周病患者的牙列缺损，其义齿修复相对困难，可选择圆锥形套筒冠义齿，即便牙周炎病人牙列仅剩1~5颗天然牙，也可修复。

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。