CT辅助咽后壁瓣手术设计

目的 建立CT辅助设计咽后壁瓣的方法,以提高治疗效果。方法 应用CT测量26例腭咽闭合不全者在静止和发“i”时腭咽腔的宽度和长度,观察分析咽后壁瓣成形术所需的宽度、长度和咽后壁瓣蒂的位置和与软腭的附着位置。结果 静止时腭咽腔的宽度15.10-37.25mm,平均27.01mm,长度12.54-30.39mm,平均22.10mm;发“i”时腭咽腔的宽度为9.11-34.06mm,平均17.69mm;咽后壁瓣蒂的位置都在第一颈椎平面或以上;与软腭的附着位置大部分在软腭的中后1/3处。结论 CT作为一种定量评价腭咽闭合功能的方法,能够辅助设计咽后壁瓣手术方法。     

牙体预备对牙龈结合上皮损伤后的超微结构观察

目的 :研究烤瓷修复体牙体预备对牙龈结合上皮损伤后 ,牙龈结合上皮在透射电镜下形态学变化的特点。方法 :将 16只家兔的 3 2颗上前牙分别用金刚砂车针和手术刀破坏左侧上前牙的牙龈结合上皮 (JE) ,以右侧同名牙为对照 ,分别于 1、2周取材 ,利用透射电镜观察结合上皮的组织学改变 ,并对 2实验组进行对比观察。结果 :金刚砂车针处理组和手术刀处理组 2周后牙龈结合上皮附着恢复 ,两处理组无明显差别 ,与未经手术处理的JE比较 ,处理组主要超微结构变化是线粒体空泡化 ,基膜不完整。结论 :牙体预备对牙龈结合上皮的损伤 ,可导致结合上皮的超微结构改变     

Antibody responses against Porphyromonas gingivalis infection in patients with early-onset periodontitis

BACKGROUND, AIMS: The aim of this study was to evaluate antibody responses against Porphyromonas gingivalis (P. gingivalis) infection in early-onset periodontitis (EOP) patients to elucidate further the host-parasite interactions in the pathogenesis of EOP. METHOD: 16 P. gingivalis-infected EOP and 20 adult periodontitis (AP) patients, and 18 periodontally healthy subjects (HS) participated in this study. Serum immunoglobulin G (IgG) antibody levels and avidities against extracted P. gingivalis whole cells were measured. The components of P. gingivalis outer membrane antigens (OMA) reacting to patients' sera were analysed from the molecular weights by Western blotting. Serum antibody levels against P. gingivalis lipopolysaccharide (LPS) were also measured. The ability of the patients' sera to block interleukin-1beta (IL-1beta) production by human mononuclear cells in response to P. gingivalis LPS was examined. RESULTS: Antibody levels were positively correlated with antibody avidities in both EOP and AP patients (r=0.91, r=0.72, p<0.0005, respectively), while not significantly so in HS (r=0.09). There was variability in the antigen recognition of P. gingivalis OMA in EOP and AP patients. Smear and 53-kDa protein were more frequently recognized by sera of EOP and AP patients rather than that of HS (p<0.05). The smear was partly diminished by absorption with P. gingivalis LPS, indicating the smear antigen was partly composed of LPS. There was high correlation between antibody levels against P. gingivalis whole-cell extracts and LPS in EOP and AP patients (r=0.81, p=0.0002, r=0.87, p<0.0001, respectively), while not significant in HS (r=0.22). The sera of EOP and AP patients with high IgG titre to P. gingivalis LPS blocked IL-1beta production more effectively than that of the patients with low IgG titre to P. gingivalis LPS. CONCLUSIONS: These results indicate that EOP patients' antibody response against P. gingivalis infection does not differ significantly from that of AP patients. The person-to-person heterogeneous antibody production against P. gingivalis LPS could contribute to our understanding of the relationship between the defensive ability of EOP patients and their chronic infection with this pathogen.     

MRI在口腔颌面部肿块诊断中的应用

作者对38例发生在口腔颌面部肿块患者采用MRI检诊。结合缅针穿吸缅胞学检查，并与CT扫描对比研究。结果提示：对口腔颌面部肿块。管状瘤或临床怀疑肿瘤有颅底、眶尖、翼腭窝、咽侧、颈部大血管神经累及者。MRI扫描成像清晰。软组织分辨率高。能早期发现骨质侵蚀。作者还对MRI在监测颌面部癌瘤切除术后局部是否复发进行初步观察。     

Evaluation of formocresol versus ferric sulphate primary molar pulpotomy: a systematic review and meta-analysis

AIM: To present a systematic review of the effects of formocresol and ferric sulphate when used as medicaments in pulpotomized primary molar teeth. METHODOLOGY: The study list was obtained by using MEDLINE, the Cochrane Library, EMBASE and SCI search. Only those papers which met the inclusion criteria were accepted. The quality of studies used for meta-analysis was assessed by a series of validity criteria according to Jadad's scale. A systematic review and meta-analysis were performed. RESULTS: Eleven clinical studies comprising four randomized-clinical trials (RCTs), four controlled clinical trials (CCTs) and three retrospective studies were included. The results of the meta-analysis of six prospective clinical trials suggested that the two popular pulpotomy medicaments were not significantly different in terms of clinical outcomes, radiographic findings, prevalence of apical and furcal destruction, internal root resorption or pulp canal obliteration. The relative risk (RR) value and 95% CI for those parameters were 0.72 (0.43-1.23), 0.87 (0.59-1.30), 0.67 (0.27-1.66), 1.77 (0.56-5.58) and 1.41 (0.63-3.15), respectively. The overall clinical and radiographic success rates based on the data of treatments with ferric sulphate from the 11 studies included ranged from 78% to 100% (mean 91.6 +/- 8.15%) and from 42% to 97% (mean 73.5 +/- 18.40%), respectively. CONCLUSIONS: In primary molar teeth with exposure of vital pulps by caries or trauma, pulpotomies performed with either formocresol or ferric sulphate have similar clinical and radiographic success. Ferric sulphate may be recommended as a suitable replacement for formocresol.     

A comparative morphologic study of Carabelli cusp between Chinese and Japanese students.]

The study of teeth,dentition and occlusion is helpful to guide oral medical clinic and the study of anthropology.Our department of Osaka Dental University and had many items of research work about teeth,dentition and occlusion between Chinese and Japanese students.This article reports the study of Carabelli cusp.The results revealed:(1)the rate of Carabelli cusp is higher in Japanese than in Chinese and is higher in male than in female.(2)the rate of Carabelli cusp of the first maxillary molar of both side is very high.(3)The rate of Carabelli cusp is related to the height and the type of cusp numbers.These all illustrated the occurence of Carabeiil cusp were influenced by race, individual and the development of teeth.     

Power spectral analysis of electromyographic signal of masticatory muscles at rest position and habitual clench

Thirteen normal subjects were selected for this investigation. At the vertical dimension of rest position and habitual clench, their myoelectric activities of the masseter, anterior and posterior temporal, and digastric muscles on the left and right sides were simultaneously sampled and processed by computer, and the mean power frequency (MPF) and the mean amplitude (MA) of the myoelectric signal were calculated. At rest position, the temporal muscles were major muscles and the MPF differences of various masticatory muscles were not significant. At habitual clench, with the increase in MA, the MPF of various muscles increased. The results show that MPF may have application in describing a central tendency of myoelectrical signal frequency distribution and in evaluating recruitment of motor units. MPF and MA are the quantitative indices reflecting masticatory muscle function.     

术前正畸对骨性Ⅲ类错颌患者颞下颌关节影响的锥形束CT研究

目的 探讨术前正畸对行正畸-正颌联合治疗的骨性Ⅲ类错颌患者颞下颌关节（TMJ）的影响。方法 选取24例行正畸-正颌联合治疗的骨性Ⅲ类错颌患者,分别在术前正畸完成前后检查并记录关节症状,并行锥形束CT（CBCT）扫描,在三维方向测量髁突各径值（d）、髁突高度（h）、不同角度下关节间隙（L）、双侧髁突间距（R）及各髁突角度值,比较和分析不同时期TMJ症状及骨性结构的变化情况。结果 术前正畸前后关节症状无明显改变;颞下颌关节骨性结构在三维方向上的各测量指标均无显著变化（P>0.05）。结论 在正畸-正颌联合治疗过程中,术前正畸不会对患者TMJ产生明显影响。     

三种丙烯酸树脂牙和丙烯酸牙托粉的结合强度实验研究

为了探求人造牙从基托上脱落下来的原因,本文作者对三种丙烯酸树脂牙和三种丙烯酸牙托粉的拉伸结合强度和剪切结合强度进行了测试,结果表明,材料和不同品牌材料的匹配都会影响人造牙与基托的结合强度;塑料牙盖嵴面打磨粗糙后,可显著增强塑料牙与基托树脂的结合强度。