梯度旋转下降法修复单侧完全性唇裂的初步研究

目的探讨梯度旋转下降法修复单侧完全性唇裂的术后效果。方法分析85例单侧完全性唇腭裂患儿的术前，术后即刻以及术后一年的面部石膏模型唇部指标，同时比较这85例单侧完全性唇腭裂患儿术后一年的唇部指标与相似年龄的45例单纯不完全性腭裂患儿的唇部指标。结果在术后即刻虽然健患侧唇高、健患侧唇宽的差值减小，但其健患侧仍不协调。术后一年，健患侧唇高和健患侧唇宽都达到协调。与对照组进行比较，唇高在术后一年恢复到正常值，而唇宽在一年后无论是健侧还是患侧，仍然低于正常值。结论采用梯度旋转下降法修复单侧完全性唇裂可以达到一个很好的唇部美观效果。     

金属表面处理对金-瓷结合强度的影响

本文对金属烤瓷修复体的金属四种不同的表面处理:粗化、清洗、除气,预氧化进行实验研究。提示金属烤瓷修复体的金属表面处理应完整地包括粗化、清洗、除气、预氧化。缺少任何一个步骤都会使金-瓷结合强度明显降低。     

上颌尖牙唇向错位34例临床矫治

为了对上颌尖牙唇向错位进行正确的矫治设计,作者根据错位的病因、X线头影测量结果,对34例上颌尖牙唇向错位病例,分别采用前牙片段方丝辅弓法,改良Richett's弓法,推磨牙向后法,拔除第2乳磨牙法,拔除第一双尖牙法,取得满意结果。作者认为在矫治上颌尖牙唇向错位时,应充分利用潜在间隙,根据X线头影测量结果及错位形成原因进行综合分析,选用最佳方法进行矫治。     

Major hematological diseases associated with cleft lip and palate.

OBJECTIVE: Cleft lip and palate is among the most common congenital anomalies. Its association with major blood disorders has rarely been reported. The purpose of this study was to report two patients who had major blood diseases associated with cleft lip and palate. PATIENTS AND RESULTS: From June 1995 to December 1997, there were 2700 patients with cleft lip, cleft palate, or both who received treatment at Chang Gung Memorial Hospital. Two of them were found to have major hematological disorders. In both cases, the disorder was detected by preoperative blood cell counts and white cell differentiation. Case 1 was a 21-year-old woman patient with repaired right cleft lip. She was admitted for alveolar bone grafting and closure of oronasal fistula. Abnormal presentation of blast cells was found, and subsequent bone marrow study confirmed acute lymphocytic leukemia. Case 2 was a 26-year-old man with left secondary cleft lip nasal deformity scheduled to receive staged reconstructive operations. An elevated platelet count was found and subsequently confirmed to represent essential thrombocytosis. In both cases, reconstructive operations for the cleft-related deformities were performed. CONCLUSIONS: Association of major hematological disorders and cleft lip, palate, or both is rare and is reported herein.     

Aneurysmal bone cyst of the mandible--a case report

Aneurysmal bone cysts originating in the craniofacial region have seldom been reported in Taiwan. A case of aneurysmal bone cyst arising in the right mandible of a 15-year-old Chinese boy was presented with both the roentgenographic and microscopic findings. In view of the high recurrent rate and the large destructive mandibular lesion, segmental resection with immediate bone grafting for reconstruction and a conscientious follow up regimen was employed. The etiology and pathogenesis of this interesting lesion remained unclear but several theories were reviewed and the differential diagnosis of this lesion was also discussed. Furthermore, immunoperoxidase staining for Factor VIII related antigen was performed to help differentiate between the aneurysmal bone cyst and a central hemangioma and then to elucidate the pathogenesis of the former.     

Reliability of a facebow transfer procedure.

The three-dimensional orientation of a maxillary cast mounting from a simulated-kinematic facebow transfer was evaluated in multiple trials among three operators on a single subject. The anterior and posterior anatomic facial reference points were marked on the subject. Each operator performed a separate series of trials to reset the anterior facebow component, the two posterior facebow components, and a control series with no resetting of any facebow components relative to the subject. The x, y, and z coordinates of three reference points on the maxillary cast were determined with a machinist microscope relative to a fixed reference after each facebow transfer. A range of differences between mountings of the maxillary cast were found between trials with all three methods used. These mounting errors were due to setting of the instrument and would be expected in routine clinical use of this instrument.     

下颌骨骨折动力加压固定断面应力分析

实验采用反射光弹模拟应力分析法,通过受力模型等差线条纹图观测、分析、量化换算,对下颌骨骨折轴向和偏心动力加压固定作断面压应力比较研究.结果显示两种固定状态下骨折断面均表现为挤压应力,沿骨折线应力分布不均匀,板周区和牙槽区呈压应力高峰带,最大应力分量在轴向和偏心加压分别为1.8MPa和2.3MPa(板周区),以及0.5MPa和1.0MPa(牙槽区),中间区受力较弱.轴向动力加压总压力为100N,偏心动力加压总压力为140N,后者比前者断面应力分布稍趋合理.