目的：分析上颌第一磨牙根管弯曲位置、方向及弯曲度。
Objective: To analyse the root canal curvature frequency, position, direction and degree of the maxillary first molars.
目的研究上颌第一磨牙根管口形态和位置关系，为根管治疗时寻找根管口提供解剖学依据。
Objective To study the shape and location of root canal orifice in maxillary first permanent molar and provide a morphological basis for locating canal orifice in endodontic therapy.
结论腭穹隆形状、牙尖斜度和人工牙的排列位置对上颌全口义齿牙槽骨的应力集中状况有明显的影响作用。
Conclusion the palatal vault, cusp inclination and the position of artificial teeth have apparent influence upon the stress concentration on the alveoli dentales maxillae.
下颌骨对上颌骨乃至颅骨的位置关系。
The position relation between mandible and maxilla or cranioaural.
随着生长，男女上颌相对于颅底的位置无显著变化，而下颌突度增加；
With growth, the maxillary position which related to the cranial base was remained relatively constant while the mandible continually protruded forward.
观测到眶下孔数目为单孔的占93％，呈卵园形，有副孔的占7％，并测量了它们在上颌骨的确定位置。
The results show that 93% of the suborbital foramen is an oval-shaped mono-foramen and 7% has a paraforamen, their exact positions on the maxilla being measured.
结果：16例上颌埋伏阻生前牙均顺利萌出至正常位置，牙髓活力测试正常。未见龈退缩、邻牙牙根吸收和支抗丧失等常见并发症。
Results: All impacted anterior maxillary teeth of the 16 cases were successfully moved into alignment with pulpal vitality , and no postoperative complications were found.
方法根据患者的年龄和发育阶段、上颌尖牙的形态、位置以及萌出间隙等情况，对2 1例上颌尖牙阻生患者采取了不同的矫治方法。
Methods According to age, the stage of the patients, the shape and the position, and the eruption space, twenty-one patients were treated with the different orthodontic methods.
方法：根据肿瘤位置不同，分别采用（1）上颌窦前壁拆装；
Methods:Based on the sites of the tumors, following approaches were adopted:(1)the anterior maxillary sinus wall disassemble approach;
方法：根据肿瘤位置不同，分别采用（1）上颌窦前壁拆装；
Methods:Based on the sites of the tumors, following approaches were adopted:(1)the anterior maxillary sinus wall disassemble approach;
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