前咬合

The first three largest number of missing teeth is as follows: maxillary first molar, maxillary second molar and mandibular first molar. The first three largest number of resident teeth is as follows: mandibular cuspid, mandibular bicuspid and maxillary cuspid. The cases without occusal relationship account for 19.51%; and the cases which need occlusal reconstruction or occlusal elevation account for 19.51% of all the cases, while food impaction exists in 21.84% cases.

结果：本组老年人平均缺失牙齿9.10颗，缺失最多的前3位牙齿是上颌第一磨牙、上颌第二磨牙和下颌第一磨牙；余留最多的前3位牙齿是下颌尖牙、下颌第一双尖牙和上颌尖牙。19.51%的病例颌骨间无咬合接触关系，19.51%的病例修复时需咬合重建或咬合抬高；21.84%的病例修复前存在食物嵌塞。

Results With the titanium-miniplates, the fractures were satisfactorily fixed in all cases with satisfied occlusion, but one had local malocclusion that was rectified by intermaxillary traction.

结果 52例患者创口均Ⅰ期愈合，骨折愈合良好，51例恢复到术前咬合关系，有1例固定后出现咬合关系不良。经颌间牵引后恢复正常咬合关系。

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: To study the stress of mandible premolar under various loadings on its traumatic occlusal spots.

目的：研究不同载荷加载于下颌前磨牙临床常见的创伤性咬合点时牙体组织的应力分布。

These morphological differences may contribute to the mandibular prognathism.

这些形态的差异，可能与三级异常咬合者的下颚前突的脸部轮廓有关。

METHODS: A 3D finite element model of mandibular complete dentures supported by implants was established to analyze the stress status with protrusive or lateral occlusions.

建立种植全口固定义齿和种植全口覆盖义齿的三维有限元模型，然后进行侧方咬合平衡与不平衡、前伸咬合平衡与不平衡模拟加载分析。

Methods:The occlual contact characters of 32 cases with TMD and 30 controls were measured with T-Scanll system in the intercuspal occlusion position, the protrusive movment as well as lateral movement.

材料和方法：应用T—ScanⅡ咬合分析仪对32例TMD患者进行牙尖交错位、前伸及侧方运动的咬合检查并与正常组对照。

Results: Among the 47 cases, 33 cases were teeth pulpless tissue including 14 endodentically treated teeth and 14 cases were vital teeth with periodontitis, cracked tooth and occlusal traumatism.

结果：牙冠纵折多见后牙，以上颌第一磨牙为多见，其中无髓牙33例，牙折裂前有近一半曾作过根管治疗，活髓牙14例，存在不同程度的牙隐裂，牙周炎和咬合创伤。

All surgical procedures were consulted by Champy Method and AO principle. Results: No infection was found 58 cases had satisfied occlusion, 4 cases had unfavorable local malocclusion.

结果：62例患者中术后4例患者发生伤口感染，5例发生局部缝线裂开，其余均Ⅰ期愈合；58例恢复到术前咬合关系，仅4例患者出现局部咬合关系不良；术后张口度≥37 mm者56例；X线复查未发现骨愈合不良或假关节形成。

PURPOSE: To study the stresses and movement of central incisor with three-dimensional dynamic finite element method, in order to understand and describe the process of occluding.

目的：采用动态有限元方法模拟前牙咬合过程，分析上、下前牙在功能咬合过程中的运动和受力变化规律，为全程描述前牙生理咬合过程提供理论依据。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。