北京地区九十年代成人侧貌检查敏感指标的研究

目的 针对每一类错(牙合)进行软组织敏感指标筛选,以探讨简化繁杂临床诊断分析过程的方法。方法选择150例个体的X线头颅侧位片。其中正常(牙合)组60例、错(牙合)组90例(安氏Ⅰ类双牙弓前突、Ⅱ类、Ⅲ类错(牙合)各30例,男女各半),测量结果经SPSS8.0统计软件处理。结果 1.安氏Ⅰ类、Ⅱ类错(牙合)筛选出的敏感指标相同,共有6项,符合率为84.44％。2.安氏Ⅲ类错(牙合)筛选出敏感指标3项,符合率为96.67％。3.对以上软组织指标有影响的硬组织测量项目7项。结论 敏感指标的筛选为简化临床诊断过程提供了有益参考。     

人牙周膜细胞体外三维立体培养模型的建立

目的：建立人牙周膜细胞（PDLC）体外三维立体培养模型，初步探讨两种支架材料应用于牙周组织工程的可行性，为进一步研究牙周组织生理病理及牙周组织工程奠定实验基础。方法：组织块法培养人PDLC，传代扩增后，接种于珊瑚和珊瑚转化羟基磷灰石（CHA）两种三维支架上，体外继续培养3d，进行细胞计数和扫描电镜观察。结果：细胞在两种支架材料上均能形成良好贴附并增殖，扫描电镜可见两种支架材料均具有良好的多孔网状结构，细胞在支架材料上生长旺盛，伸展充分。结论：可通过将人PDLC接种到珊瑚或CHA上建立体外三维立体培养模型，珊瑚和CHA均有望成为牙周组织工程的支架材料。     

110例上海地区正常合汉族成人软组织侧貌的X线头影测量分析研究

本文对上海地区正常胎成人作了软组织侧貌的头影测量分析，认为侧貌形态的数值化测量，较目测或照片提供了更为可靠的疗效评价依据，其测量指标，对正颌外科手术设计，有重要的参考价值，甚至具有决定作用。     

全冠边缘材料与位置对人牙周组织的影响

目的 探讨全冠边缘材料和位置对人牙周组织的影响.方法 对需作全冠或双端固定桥修复并符合纳入标准的20例患者的30颗牙,在牙体预备前、全冠或双端固定桥黏固后7～8周,分别记录其颊侧牙龈的菌斑指数(PLI)、牙周探诊深度(PD)、龈沟出血指数(SBI),并测量其龈沟液(GCF)量、龈沟液的天冬氨酸转氨酶活性(AST活性).全冠或固定桥黏固前后分别测量冠边缘间隙.暂时冠和全冠黏固后对患者各行1次口腔健康教育.结果 全冠黏固后7～8周,全冠对应牙龈的PD、 SBI≥2频率、GCF量及AST活性没有明显变化, PLI≥1的频率明显下降.结论 具有良好的口腔卫生习惯、制作精良的全冠黏固后7～8周,金属边缘、烤瓷边缘、平龈冠边缘、龈下冠边缘均不会引起人牙龈的不良反应.     

The pH and titratable acidity of a range of diluting drinks and their potential effect on dental erosion

Objectives. To investigate, in vitro, the potential dental effects of diluting juices by measuring their acidity levels and to examine the effect dilution has on the potential erosive properties of the drinks.

Methods. Four commonly available diluting drinks were assessed for both pH and titratable acidity at a variety of dilutions, reflecting the range of concentrations over which such drinks may be consumed. Predetermined dilutions of citric acid and hydrochloric acid, with similar pH values to those of the drinks, were used as positive control acidic solutions. The pH measurements throughout the study were made using a pH electrode connected to an Orion EA940 IonAnalyser.

Results. All four drinks demonstrated a high degree of resistance to a rise in pH, indicating high intrinsic buffering capacity. The measured pH changed very little with increasing dilution ratio when compared to the citric and hydrochloric acid controls, even when considered extremely dilute. In contrast, the titratable acidity of each of the drinks reduced proportionally with increasing dilution, thereby reducing considerably its erosive potential.

Conclusions. While dilution had very little effect on the measured pH values, the titratable acidity reduced as the drink became more dilute. Since there appears to be a direct relationship between dilution and titratable acidity, the erosive potential of diluting juices may be reduced substantially by the addition of water. It remains unlikely, however, that the drinks would ever be consumed at a ‘safe’ level of dilution due to diminished taste and colour.     

Oral focal mucinosis

Oral focal mucinosis (OFM) is an uncommon clinicopathological entity which is considered to be the oral counterpart of cutaneous focal mucinosis and/or cutaneous myxoid cyst. It is comprised of a clinically elevated mass with a histological picture of localized areas of myxomatous connective tissue. The present study adds 15 new cases of OFM to the literature and analyzes their clinical, histological and histochemical features. Most of the lesions were located in the gingiva and alveolar mucosa. The nature of the lesion is unclear and it is suggested that the mucinous accumulation is the result of fibroblastic overproduction of hyaluronic acid.     

Orthodontic treatment of severely protruded maxillary anterior teeth in a middle age adult female

The multi-disciplinary concept of dental care in the adult patient, especially the middle age group, has recently received considerable attention in orthodontics. The author presents the orthodontic treatment of a middle age female with severe overjet. The patient was forty-one years and eleven months old female with a Class II, Division 1, malocclusion. Besides a severe skeletal discrepancy in the anterior-posterior relationship, the U1-SN was 123.5 degrees. There were spaces in the maxillary anterior segment and a large space was present between the canine and first premolar. The mandibular right first and second premolars occluded in lingual position. Begg plastic brackets were placed in the maxilla and C.A.T. brackets were placed in the mandible. The severe curve of Spee was eliminated by the use of a tandem depression archwire system in the mandibular arch. Both light wire mechanics and edgewise straight wire mechanics were used effectively during the treatment process. The active treatment period was three years. Overjet changed from 15.5mm to 6.0mm and overbite from 7.0mm to 3.3mm. The U1-SN and U1-AP were greatly reduced. The lower anterior teeth were labially inclined, increasing the IMPA from 96.5 degrees to 107.5 degrees. The periodontal tissue suffered no damage from the mechanical orthodontic procedures. The patient was significantly pleased with the treatment results.     

双抗胶原膜的临床抗菌抗降解观察

目的：评估自行研制用于引导牙周组织再生（ＧＴＲ）的双抗胶原膜（ＢＡＣＭ）在临床应用中实际抗菌能力和抗酶解性能。方法：对１２例牙周炎患者行体内药物释放试验，以高效液相色谱测其龈沟液四环素含量；应用扫描电镜观察ＧＴＲ术后１周取出的ＢＡＣＭ膜上的细菌附着情况。结果：牙周袋内放置四环素１５０μｇ，１周后龈沟液中药物浓度为２０．７８μｇ／ｍｌ，扫描电镜观察胶原膜纤维结构完好无损，ＢＡＣＭ上细菌数明显少于对照膜（ＧＬＣＭ）。结论：临床评估ＢＡＣＭ能显著减少细菌对胶原膜的附着，并具有一定抗胶原酶的性能。