下颌尖牙高[牙合]型[牙合]板配合直丝弓矫治器治疗前牙深覆[牙合]深覆盖临床观察

目的：总结下颌尖牙高[牙合]型[牙合]板配合直丝弓矫治器治疗前牙深覆[牙合]深覆盖的临床疗效。方法：选择Angle Ⅰ类错[牙合]上颌前牙有散在间隙伴深覆[牙合]深覆盖病例15例,男7例,女8例。年龄18～22岁。均采用国产直丝弓托槽,先行上颌牙固定矫治。同时下颌配戴尖牙高[牙合]型[牙合]板打开咬合,矫治前拍摄头颅侧位定位片,待咬合打开,后牙有接触时再拍摄头颅侧位定位片,选择头影测量指标22项,对测量结果进行T检验。结果：MP—SN,S-Ar—Go,Y—axis在戴尖牙高[牙合]型[牙合]板治疗前后均有显著性差异,N—Me,ANS—Me也有显著性差异,下颌平面角增大,下颌有后旋趋势,有利于改善低角型面形。U6-PP,L6-PP增大,有显著性差异,上下后牙均有升高,有利于打开咬合,解除深覆[牙合]。U1-PP增大有显著性差异,提示上前牙伸长,L1-Mp有减小的趋势,没有显著性差异,下前牙有压低的可能。U1-SN,UI—NA,U1-PP有非常显著差异,上颌前牙明显内收,深覆盖明显改善。结论：下颌尖牙高[牙合]型[牙合]板配合直丝弓矫治器是-种治疗前牙深覆[牙合]深覆盖的有效方法。     

47例重度深覆合深覆盖外科治疗的临床分析

重度深覆合深覆盖伴上前牙拥挤的病例临床常见 ,它严重影响美观和咀嚼功能。目前牙外科正畸是解决这一问题的有效办法 ,但相对其它前牙错位畸形而言 ,手术难度大 ,治疗效果不甚理想 ,因此临床治疗中较难把握。现将我科 1 993年～ 1 999年所做牙外正畸术中 47例重度深覆合深覆盖伴上前牙拥挤的病例进行分析。1　资料和方法　　 47例均为前牙深覆盖超过 8mm(最高距离1 2 mm)深覆合均为 3度 (其中 2 4例下前牙已及上颌腭侧牙龈 ) ,上前牙不同程度拥挤 ,下前牙拥挤不明显。其中男性 2 6例 ,女性 2 1例 ,年龄最大 42岁 ,最小 1 8岁 ,平均年龄 2 7…     

减数下颌切牙在正畸-种植修复联合治疗中的设计和应用

目的评价正畸-种植修复联合治疗患者减数下颌单个切牙矫治的临床疗效,探讨其适合的病例选择标准及临床操作要点。方法从148例正畸-种植修复联合治疗病例中选出涉及减数下颌单个切牙矫治的21例患者,男9例,女12例,平均年龄32．1岁。所有患者均存在缺失数目不等的上颌前牙。21例患者均存在针对具体矫治目标而需要考虑的前牙牙量不调。其中7例接受了上下颌矫治,14例仅接受了下颌固定矫治器治疗。正畸治疗和种植修复完成后,对21例患者的前牙咬合关系和牙齿排列进行临床疗效评价。结果21例下切牙拔牙间隙完全关闭,相邻牙齿牙冠无倾斜,X线全口曲面断层片显示拔牙间隙关闭处两侧牙齿牙根平行。所有患者治疗后下前牙排列整齐,前牙覆[牙合]覆盖关系正常,后牙段维持了治疗前的排列和与[牙合]关系。下切牙间隙关闭处未出现和邻近牙位明显差异的“黑三角间隙”。正畸治疗后上前牙种植牙处覆盖平均2mm。种植医师对正畸治疗后的前牙[牙合]关系满意。结论对存在Bolton指数不调,上前牙牙量较小,下前牙中度拥挤或伴有下牙轻度前突的Ⅰ类或轻度Ⅲ类正畸-种植修复联合治疗患者,设计减数单个下切牙治疗,可以获得正畸和种植均满意的牙齿排列和前牙[牙合]关系。     

固定修复重建改善重度成人前牙深覆的研究

目的：总结重建改善成人重度深覆修复方法的综合应用和临床体会。方法：对9例重度前牙深覆伴不同程度牙体牙列缺损的患者,综合应用固定义齿修复,通过适度增高垂直距离的重建方式改善患者的咬合关系。结果：重建以后全部患者牙列形态良好,咬合稳定,咀嚼功能及前牙美观均得到明显改善,经过半年至1年观察,无患者出现颞下颌关节不适主诉。结论：在患者已存在牙体牙列缺损需要修复时,采取适当增加垂直高度的修复性重建方法,可在修复牙体牙列缺损的同时,有效改善成年重度前牙深覆患者的咬合关系、咀嚼功能和美观,是一种较理想的选择。     

4～6岁幼儿乳前牙重度内倾型深覆[牙合]矫治后下颌骨生长发育状态观察

目的：观察4-6岁乳前牙重度内倾型深覆[牙合]幼儿采用上颌[牙合]垫舌簧矫治器与小平导板进行矫治后下颌骨生长发育的特征。方法：对30例4～6岁乳前牙重度内倾型深覆[牙合]患儿采用上颌[牙合]垫舌簧矫治器与小平导板进行矫治,矫治前后进行头影测量分析,进行统计学检验。结果：内倾型深覆[牙合]患儿经正畸矫治后下颌后缩,下颌长度发育不足及上下面高比例失调等情况明显改善,治疗前后比较差异有显著性。结论：早期矫治重度内倾型深覆[牙合]合有助于患儿下颌骨水平向的生长发育。     

正畸结合固定修复前牙重度磨耗的临床研究

目的探讨正畸助萌技术结合固定修复对前牙重度磨耗者进行[牙合]重建的临床效果。方法对前牙重度磨耗的患者，采用正畸助萌技术伸长磨牙，适度增加[牙合]间距离，以便恢复前牙解剖形态，行前牙烤瓷固定修复。结果验重建后，牙列形态与咬合获得恢复，咀嚼功能良好。随访6～24个月无复发。结论正畸助萌结合固定修复是一种用于前牙重度磨耗[牙合]重建的有效方法，既可改善咀嚼功能和美观，又可保存后牙的牙体组织。     

影响深覆(牙合)矫治后疗效稳定性的因素

传统观点认为覆[牙合]可为下颌的前伸运动提供引导，是维持良好的下颌后方铰链轴位所必需的。深覆[牙合]常被视为牙龈退缩、牙齿松动、咀嚼时下颌运动干扰及颞下颌关节紊乱病的病因。但矫治深覆[牙合]较困难，矫治后患者的覆[牙合]关系易复发至治疗前的状态。深覆[牙合]矫治后的稳定性一直是正畸医师关注的问题，大量研究表明，深覆[牙合]的复发不易预测，存在较多影响深覆[牙合]矫治后稳定性的因素。现对影响深覆[牙合]矫治后长期稳定性的可能因素进行综述。     

压低辅弓有效改正成人前牙深覆(牙合)的正畸治疗

目的 探讨自制压低辅弓对成人前牙深覆(牙合)的临床疗效及其作用机制。方法选择16例前牙深覆(牙合)的成年患者,采用直丝固定矫治器结合自制压低辅弓打开其咬合,通过X线头影测量分析患者矫治前、后前牙深覆(牙合)的变化,再结合治疗前后的临床检查和X线检查评价治疗效果。结果患者治疗后上前牙垂直向平均压入2mm,矢状向无明显唇倾...     

上前牙缺失并重度深覆牙合的正畸与修复

上前牙缺失并重度深覆牙合的正畸与修复暨南大学医学院口腔系（５１０６３２）谢黎上前牙缺失伴重度深覆牙合患者，由于下前牙切缘咬在上前牙舌隆突上或牙颈部，严重者直接咬在上颌硬腭粘膜上，使龈组织发生创伤。下颌前伸及侧向运动受障碍，下颌只具有铰链运动，严重影响...     

正畸结合高强纤维夹板在牙周病治疗中的应用

目的：评价正畸结合超强玻璃纤维夹板治疗牙周病的临床效果。方法：14例成人牙周病继发牙[牙合]畸形患者,在控制牙周炎症的基础上,应用固定矫治技术进行牙[牙合]畸形的矫治,并采用超强玻璃纤维加树脂作为固定牙周夹板。结果：随访1～3年,牙齿排列整齐,前牙覆[牙合]覆盖关系正常,牙周状况明显改善,有效地巩固了牙[牙合]畸形的矫治效果,增强了美观。结论：正畸治疗是牙周病综合治疗的重要组成部分,可以恢复牙列外形,达到改善和恢复咀嚼功能的目的;超强纤维牙周夹板的应用可有效地保持错[牙合]畸形的矫治效果,保存松动患牙。     

Osteochondroma of the mandibular condyle. Report of a case and review of the literature

Osteochondroma (osteocartilaginous exostosis) is a rare tumour in the region of the mandibular condyle. Much confusion seems to exist in the literature in differentiating these tumours from condylar chondromas as well as from condylar hyperplasias. A case of condylar osteochondroma with a review of the literature is presented.     

The effect of age and prosthodontic status on the clinical and electromyographic assessment of the interocclusal rest space

Statement of problem

Clinicians are aware that the vertical dimension of occlusion and the interocclusal rest space (IRS) are 2 major factors that require consideration in the management of patients needing oral reconstructive procedures. However, how the dimensions vary with age and prosthetic status is unclear.

Congenital double upper lip: A case report and review of the literature

Congenital double lip is a rare developmental anomaly which usually involves the upper lip more than the lower lip. It may occur in isolation or as a part of Ascher’s syndrome. Sometimes upper and lower double lips occur simultaneously.The occurrence of double lip may result in facial deformity especially when the patient attempts to talk, smile or even show the teeth. It may also interfere with speech or mastication. Although surgery may be undertaken to facilitate speech and mastication, the majority of cases are operated for cosmetic reasons.A case of congenital double upper lip, which was surgically treated after orthodontic treatment, for cosmetic reasons, is reported. The different surgical approaches to the management of double upper lip are reviewed with a note on timing of surgery in patients who have concurrent orthodontic or prosthodontic problems.Although the majority of cases of double lip are treated by Plastic Surgeons and Oral and Maxillofacial Surgeons, it is important to make dentists aware of this condition since they may be the first clinicians to encounter patients with this abnormality.     

Oral cancer and precancer as diseases of the aged

Some cancers, especially sarcomas, favor younger age groups, whereas others, particularly carcinomas, are most likely to develop in older age groups. The relative frequency, mortality and morbidity rates are defined using lip and tongue cancer as examples. The paper demonstrates how oral cancer rates increase with age. For tongue cancer there is a worsening of the prognosis with advancing age. The synergistic effect of tobacco and alcohol and its relation to age is also dealt with. For leukoplakia there is also a higher rate with increasing age, although there is a shift towards younger ages when compared with oral cancer. Tobacco, age and leukoplakia are also discussed. The increased cancer and precancer rate in older people may be due to age changes in the oral mucosa making it more vulnerable to the action of carcinogens.     

Biochemical and immunohistochemical studies of the protein expression and localization of decorin and biglycan in the temporomandibular joint disc of growing rats

To analyze the growth-related changes in extracellular matrix components, biochemical/immunohistochemical techniques were used to examine the protein expression and localization of two small leucine-rich proteoglycans, biglycan and decorin, in the temporomandibular joint discs of growing rats. Western blotting showed that the protein expression of decorin increased with age, but that of biglycan gradually decreased. An immunohistochemical study showed that staining for decorin was weak and homogeneously distributed in the discs from birth to 2 weeks. Regional differences in staining for decorin became prominent at 4, 8 and 16 weeks; decorin was more abundant in the peripheral area (the periphery of the band and the attachment) than in the central area (the intermediate zone and central area of the posterior band). In contrast, staining for biglycan was evenly distributed throughout the disc until 4 weeks, and after that became rather intense in the anterior and posterior bands. These results demonstrate that there are growth-related changes and regional differences in the expression of biglycan and decorin in the temporomandibular joint discs of growing rats, which probably reflect changes in the biomechanical environment caused by the development of orofacial functions.     

Differential lectin-bindings in normal and precancerous epithelium and squamous cell carcinoma of the oral mucosa

In order to establish a useful and objective marker of malignancy of oral mucosa, the binding sites for Ulex europaeus agglutinin I (UEA-I). Bandeiraea simplicifolia agglutinin I (BSA-I) and peanut agglutinin (PNA) were comparatively examined in the surgical materials from the normal, dysplastic and cancerous epithelium of the oral mucosa by a novel lectin-antilectin immunoperoxidase method. Based on the staining patterns of the normal keratinized epithelium, UEA-I was regarded as the marker for the prickle cells, BSA-I for the cells in the upper prickle to the horny layers, and PNA for those in the basal layer. As the degree of dysplasia advanced, all layers of epithelium came to react with UEA-I and PNA, whereas the BSA-I binding was negative. Positive reactions for UEA-I and PNA were seen in most carcinoma cells other than the keratinizing foci stained by BSA-I. The results indicate that a UEA-I-positive reaction in the basal cells, a PNA-positive in the prickle cells and loss of receptor for BSA-I occur in the course of malignant transformation of oral mucosa, and that these lectins may be regarded as useful markers of oral epithelial cytoplasmic differentiation.     

Prime ＆ Bond NT粘结剂对银汞合金充填微渗漏及密合度的影响

目的探讨Prime&Bond NT粘结剂对银汞合金充填微渗漏及密合度的影响.方法前磨牙120个,随机分为2组,分别进行微渗漏实验及密合度实验.每组中又分为空白对照组、EDTA组和实验组.每个样本的中央制备深3 mm、直径2 mm的窝洞,空白对照组进行常规银汞合金充填;EDTA组使用10%EDTA处理窝洞后充填银汞合金;实验组在EDTA组的处理基础上采用Prime&Bond NT粘结剂进行粘结性充填,分别采用染料渗入法及扫描电镜进行微渗漏及密合度观察.结果实验组的微渗漏率及洞壁与充填体间的间隙明显小于EDTA组(P<0.01);EDTA组又小于空白对照组(P<0.05).结论Prime&Bond NT粘结剂能增加洞壁与银汞合金充填体间的密合度,减少微渗漏.     

成人骨性Ⅱ类错畸形上气道与上、下颌骨形态分析

目的: 应用锥形束CT（CBCT）分析骨性Ⅱ类错畸形患者上气道与上、下颌骨形态的相关关系。方法: 选择骨性Ⅱ类及骨性Ⅰ类错畸形成年患者各33例进行CBCT扫描,保存为Dicom文件,导入Mimics 19.0软件中进行三维重建,对2组患者上气道与上、下颌骨数据进行测量。采用SPSS 19.0软件包进行统计学分析,比较成人骨性Ⅱ类错与个别正常间上气道与上、下颌骨形态、结构的差异,以及骨性Ⅱ类错畸形患者上气道与上、下颌骨测量项目的相关关系。结果: 骨性Ⅱ类错组和个别正常组上气道形态与上、下颌骨测量结果比较,15个测量项目有显著差异(P<0.05)。骨性Ⅱ类错组上气道形态与下颌骨长度存在相关性的项目有10个,骨性Ⅱ类错组上气道形态与上颌骨宽度各测量项目中有显著相关性的项目有13个,骨性Ⅱ类错组上气道形态与下颌骨宽度各测量项目中有显著相关性的项目有3个。结论: 骨性Ⅱ类错畸形患者上气道与上、下颌骨之间具有相关关系。骨性Ⅱ类成人患者的上气道与上、下牙弓宽度也有一定相关关系。