混合牙列期提前拔除下颌第一乳磨牙对继承恒牙萌出的影响

目的 探索提前拔除下颌第一乳磨牙对加速继承恒牙萌出的影响，产生有利于序列拔牙的萌出顺序。方法 筛选13例牙列拥挤的患儿，当其下颌第一双尖牙根长超过1／2时，拔除一侧的下颌第一乳磨牙。用患儿的对侧牙做对照组。结果 拔牙侧有9例患儿第一双尖牙先于尖牙萌出，4例患儿尖牙先于第一双尖牙萌出；对照侧尖牙均先于第一双尖牙萌出。结论 提前拔除下颌第一乳磨牙，可使第一双尖牙先于尖牙萌出。但在第一双尖牙被阻碍或尖牙无阻碍的情况下．难以达到促萌目的。     

发育性偏颌畸形的整形外科矫治

目的探讨发育性偏颌畸形的外科矫治方法。方法通过对21例发育性偏颌畸形患者的畸形部位与程度，分别采用LefortⅠ型截骨、下颌升支矢状劈开、颏部水平截骨、下颌骨外板截除、下颌骨外板移植等项整形手术治疗，并就该类患者颌面结构特征、手术方式的选择及疗效进行了回顾性分析。结果自1997年7月至2003年10月共治疗发育性下颌偏斜畸形21例，根据不同的类型采用相应的手术方法，获得了满意面部形态和殆功能。结论发育性偏颌畸形，根据不同类型运用相应的措施，通过恢复面部骨性轮廓支架和殆关系，配合术前术后的正畸治疗，可获得满意的临床效果。     

下颌角截骨术与下颌角外板矢状劈开术联合矫治低角型下颌角肥大

目的：下颌角肥大有多种式术可选,对于低角型下颌角肥大,往往一种式术很难达到满意的矫治效果,本文选择了一组低角型下颌角肥大患者,来研究下颌角截骨术与下颌角外板矢状劈开术联合应用治疗低角型下颌角肥大的治疗效果。方法：选择本科室2005年8月～2005年11月间治疗的24例低角型下颌角肥大患者,完善术前检查与分析。在全麻下应用下颌角截骨术与下颌角外板矢状劈开术进行联合矫治。术后观察治疗效果,并在8周后对所有患者进行随访,调查患者满意度。结果：所有24例患者矫治后Ⅰ期愈合,所有患者下颌角角度增大,两下颌角间宽度明显减小,达到了下颌角的正常美学标准。8周后随访,所有患者均对治疗效果表示满意。结论：下颌角截骨术与下颌角外板矢状劈开术联合应用,可有效地矫治低角型下颌角肥大,使患者下颌角达到一个理想的美学标准。     

下颌第一磨牙三维有限元模型的建立

目的：建立下颌第一磨牙三维有限元模型。方法：通过螺旋CT扫描的方法，利用Mimics、Geomagic Studio 7等图像处理软件，HyperMesh网格自动划分软件，通过特定的MSC．MARC有限元软件建立下颌第一磨牙三维有限元模型。结果：准确的建立了牙本质、牙釉质、髓腔、牙槽骨、牙周膜等组织形态的三维有限元模型。结论：本实验建模方法可行性强，方便快捷，具有良好的生物力学与几何力学相似性。为临床口腔医师提供了一种简捷而精确的有限元建模方法。     

Stereotactic endoscopic treatment of colloid cysts of the third ventricle

Summary In order to avoid invasive procedures (transfrontal, transcallosal) in the surgical treatment of colloid cysts the stereotactic aspiration technique was introduced by Bosch, RÄhn and Backlund in 1978. The viscosity of the intracystic colloid and the displacement of the cyst away from the aspiration needle are possible reasons for unsuccessful aspiration. GT-guided stereotactic endoscopic technique gives the opportunity to fenestrate the cyst wall under direct visual control.After CT-guided stereotactic puncture of the right lateral ventricle with the foramen of Monro as target a steerable endoscope is introduced and the foramen of Monro is passed. The wall of the cyst is fenestrated and coagulated by means of monopolar (or laser) coagulation.Using this technique we have treated four patients with colloid cysts. Immediately postoperatively all of them were relieved of their complaints and have been symptomfree for a mean follow up period of twelve months. Studies of cerebrospinal fluid flow patterns, performed prior to and every six months after the endoscopic intervention, confirmed a remarkable reduction of foraminal obstruction.     

Multiple Implants for First Molar Prosthodontics

Problems that can occur when single implants are utilized to restore first molar teeth include the frequent loosening of screws, as well as screws and/or implant breakage. These may result from torquing and rotational movements of the prosthesis during masticatory and parafunctional mandibular movements. When sufficient bone and mesio-distal restorative space is present, the placement of two implants should be considered.     

保留下齿槽神经的颌骨切除兼植骨术

本文报告保留下齿槽神经血管束的下颌骨部分切除并即刻植骨修复新的手术方法5例.术后颜面部外形基本对称,6个月后对患侧下唇及颏部进行物理及电刺激等手段测试温、触、痛觉,功能恢复满意。     

Visualisation of the mandibular canal by different radiographic techniques

6 mandibles were radiographically examined bilaterally to visualise the mandibular canal. 5 imaging techniques were used: periapical radiography, panoramic radiography, hypocycloidal tomography, spiral tomography and computed tomography (CT). Panoramic radiographs were obtained with 2 different X-ray machines. The CT-examinations comprised direct images and standard reconstructions based on axial slices. The specimens were subsequently sectioned for contact radiography. The visibility of the mandibular canal was estimated by 3 observers at special reference points on all radiographs and classified as clearly visible, questionable visibility or not visible. The contact radiographs served as the "gold standard". The inter-observer and the intra-observer agreement were assessed by calculating the overall agreement and the x value. Direct coronal computed tomography, as well as spiral and hypocycloidal tomography, gave better visualisation of the mandibular canal than periapical and panoramic radiography.     

Guided tissue regeneration in the treatment of furcation defects in mandibular molars

The present investigation was designed to evaluate the regenerative potential of the periodontal tissues in degree III furcation defects at mandibular molars using a treatment procedure based on the principle of guided tissue regeneration. The patient sample included 21 patients, 26-65 years of age, who presented periodontal lesions in the right and left molar regions including "through and through" furcation defects. After an initial examination, each patient was subjected to a series of full-mouth scaling and root planing. 2-3 months later, they were recalled for a baseline examination. The furcation-involved molars were randomly assigned in each patient to either a test or a control treatment procedure. The test procedure included the elevation of muco-periosteal flaps at the buccal and lingual aspects of the molars. Granulation tissue was removed and the exposed root surfaces were debrided and planed. The width and the height of the entrance openings to the furcation defects were assessed. A teflon membrane was adjusted to cover the entrances to the defects (buccal and lingual) and was retained in the manner described by Pontoriero et al. (1988). The flaps were repositioned on the outer surface of the membrane and secured by sutures which were removed after 10 days. Following surgery, the patients were instructed to rinse the mouth twice daily for 4 weeks with chlorhexidine gluconate. The membranes were removed after a healing period of 1-2 months. A surgical procedure identical to the test procedure was performed in the control tooth regions with the exception of the placement of membranes.(ABSTRACT TRUNCATED AT 250 WORDS)