Mucocele of the glands of Blandin-Nuhn: clinical and histopathologic analysis of 26 cases

We investigated the clinical and histopathologic features of 26 cases of mucocele of the glands of Blandin-Nuhn. There was a female predominance, and most patients were younger than 20 years. Fifteen patients first visited a medical doctor and 9 visited a dentist before being referred to our department. The average duration from the time the lesion was first noticed to the patient's visit was 3.6 months. All lesions were located on the ventral surface of the tongue. In 17 patients, mucoceles were seen at the tip of the tongue, whereas 9 lesions occurred more posteriorly. Lesions were situated at the midline in 19 patients and laterally in 7 patients. All lesions presented as an exophytic mass, often with a polypoid appearance. All mucoceles were histopathologically of the extravasation type, suggesting that trauma may represent a frequent initiating factor.     

舌大小与开He相关性的研究

目的 研究舌大小与开He之间的关系。方法 采用B型超声成像方法分别测量正常He与开He患者的舌大小，通过牙He与正常He舌大小的比较，研究舌大小与开He的相关性。结果 开He患者的舌大小测量结果均值大于正常He者，而且这种差别有显著的统计学意义。结论 与正常He者比较，开He患者存在舌过大的特性。     

Terminology of facial morphology in the vertical dimension

Consideration of facial type plays an important role in the formulation of an orthodontic treatment plan and prognosis of treatment. Of particular importance is the vertical relationship, that is, whether an individual is long-faced (dolichofacial), or short-faced (brachyfacial). The vertical facial type provides a clue regarding the growth direction of the facial complex, and should be used with an anteroposterior classification to describe a patient's face. The potential for confusion in communicating vertical facial types exists due to the nature of the terminology in use. For example, the term dolichoprosopic as used in the Bimler analysis has an opposite meaning to the term dolichofacial. It would seem prudent that if such terminology is to be employed there should be some attempt at standardization, and at least an appreciation of the derivations of the terms, and their differences.     

Maxillary ameloblastoma. Case report and review of the literature

A case of maxillary ameloblastoma is presented. A non-healing, asymptomatic ulcerative lesion in the maxillary tuberosity region did not respond following relief of physical irritation. The clinical appearance of the lesion was compatible with that of a malignant tumour, but the histopathology was consistent with a diagnosis of ameloblastoma of the maxilla.     

Refractory chronic periodontitis: effect of oral tetracycline hydrochloride and root planing

Refractory chronic periodontitis of 16 patients was treated by root planing and adjunctive tetracycline hydrochloride therapy. The antibiotic was taken orally one hour before root planing and continued for six days at a dosage of 250 mg six hourly. The clinical data for each patient were recorded as the number of probing depths in each of the 1-3 mm, 4-6 mm and 7-10 mm ranges. The Multivariate Analysis of Variance (MANOVA) procedure for repeated measurements was used to analyse the data. The results demonstrated that the number of sites with probing depths of 4-6 mm and 7-10 mm associated with incisors, canines, premolars and molars decreased with a corresponding increase in the number of sites in the 1-3 mm range. Incisor and canine teeth showed a better response to treatment than premolars, which responded better than molars. The cases were followed for varying periods of time from six months to two years following antibiotic therapy. The probing depth reduction achieved following root planing and tetracycline hydrochloride therapy was maintained during this review period.     

Drug-induced palatal pigmentation

A bstract — Palatal pigmentations are rare in children. Four cases of palatal pigmentation associated with the prescribed use of the drug amodiaquine are tabulated and two are reported in detail. The wider clinical application of this anti-malarial drug and the potential for drug-induced palatal pigmentations are of dental interest. The pigmentation persists for an indefinite period after withdrawal of the drug.     

General hospital residency for dental undergraduates

A one-week full-time general hospital residency for a final year of 81 dental undergraduates has been greeted by the majority of students as being an invaluable experience. Such a residency programme could be structured to provide dental students with an even broader medical perspective during their training and thus allow for a greater clinical maturity on graduation. The present programme is outlined and discussed.     

MMP-9在复发性阿弗他溃疡中的表达及意义

目的:探讨基质金属蛋白酶(MMP-9)在复发性阿弗他溃疡中的表达及意义.方法:采用免疫组化和RT-PCR方法分别检测56例复发性阿弗他溃疡患者口腔黏膜组织中MMP-9的表达.结果:复发性阿弗他溃疡患者中MMP-9的表达明显的高于正常口腔黏膜组织,且重型患者的表达明显的高于轻型和疱疹型患者.结论:MMP-9的表达在复发性阿弗他溃疡患者中明显增高,提示其可能参与了病理过程.     

Root canal systems in mandibular first premolars with C-shaped root configurations. Part I: Microcomputed tomography mapping of the radicular groove and associated root canal cross-sections

The purpose of this study was to investigate the morphology of the radicular grooves and root canal cross-sections in mandibular first premolars that exhibit a C-shaped root. Eighty-six mandibular first premolars with C-shaped roots were scanned from the coronal to anatomical apex using microCT80. The location, length, and depth of the radicular grooves were measured. The cross-sectional morphology of root canal systems was evaluated at 11 levels. Results were subject to the Kruskal-Wallis test. Of the 86 C-shaped roots, a total of 93 radicular grooves were noted. Most of the grooves (78.5%) were located on the mesiolingual surface of the root. The C-shaped canal could vary considerably in shape at different levels, and the incidence of two canals at the middle and apical was 21% and 80%, respectively. This study shows that radicular grooves may present relevant morphologic variations in the root canal system when the C-shaped root is present.     

鼠哺乳期二(噁)英暴露对子代牙槽骨生长发育的影响

目的 研究鼠哺乳期二(噁)英类物质2,3,7,8-四氯二苯对二(噁)英暴露对大鼠仔鼠牙槽骨生长发育的影响.方法 60天龄2,3,7,8-四氯二苯对二(噁)英暴露组和对照组仔大鼠被处死,将其带有磨牙的上颌骨行树脂包埋,制备硬组织磨片并在荧光显微镜下观察,对两实验组牙槽骨的组织形态、荧光标记情况及组织形态计量学参数进行比较.结果 与对照组相比,二(噁)英暴露组牙槽骨骨小梁结构较为疏松,荧光标记较紊乱.实验组与对照组骨小梁宽度分别为(52.5±5.2)μm及(59.4±6.6)μm,二者差异有统计学意义(P<0.05);骨小梁数目分别为(3.27±0.23)mm-1及(3.75±0.29)mm-1,差异有统计学意义(P<0.01);骨小梁分离度分别为(217.3±37.6)μm及(177.6±33.8)μm,差异有统计学意义(P<0.05);矿化沉积率分别为(0.68±0.08)μm/d及(0.95±0.12)μm/d,差异亦有统计学意义(P<0.05).结论 二(噁)英类物质哺乳期暴露显著降低了大鼠仔鼠牙槽骨的质、量,并影响其空间构型.