Melanotic neuroectodermal tumour of infancy: an immunohistochemical and ultrastructural study

Two cases of melanotic neuro-ectodermal tumour of infancy (MNTI)—a rare neoplasm arising in the first year of life—are reported, with the results of immunohistochemical and ultrastructural examination. The tumours consisted of a biphasic cell population in a fibrous stroma. The small, darkly staining cells comprising the first population stained positively for synaptophysin, showing them to be neuroblasts, and the large epithelioid cells comprising the second cell population stained positively with the antibodies HMB-45 and NKI-Beteb, showing them to be melanocytes. Ultrastructural examination of the second case confirmed the biphasic nature of the tumour cells, with secretory granules and neurofilaments in the neuroblastic population, and melanosomes in the epithelioid population. These results add to the evidence supporting the neural crest origin of MNTI and confirm its formation from two distinct cell lines. Both cases have responded to local excision, with no recurrence more than a year after initial treatment.     

Salivary clearance of sugar before and after insertion of fixed orthodontic appliances

This study was conducted for the purpose of establishing the possible influence of orthodontic therapy with fixed appliances on salivary clearance of sugar. Fifteen consecutive patients between the ages 12 and 17 years took part in the investigation. Unstimulated salivary flow rate, residual volume of saliva in the mouth after swallowing (RESID), and salivary clearance of sugar was determined on two occasions, before treatment commenced and after a minimum of 3 weeks of appliance wear. Analysis of the data showed that both RESID and salivary flow rate exhibited significantly increased levels during orthodontic therapy. The insertion of fixed appliances did not seem to have any effect on the rate of salivary clearance of sugar. It was assumed that this finding could be a consequence of the combined effects of the changes in salivary flow rate and RESID.     

Removal of overhanging amalgam: A comparative study of three instruments

This study compared the effects on tooth surface of three power-driven instruments commonly used to remove overhanging amalgam. Comparisons of methods of instrumentation were made on enamel, cementum, and amalgam. Cavitron, Roto Pro, and EVA system instruments were used. Findings showed significantly more abrasion on all surfaces in EVA groups compared with other groups. All surfaces in Roto Pro groups appeared to be smoother than in other groups. There appeared to be little difference between treated surfaces and control surfaces in the Cavitron group.     

Das Göttinger Fotostatverfahren

Zusammenfassung Methode zur Anfertigung exakt auswertbarer Fotos ohne Zephalostatgerät, auch für enge räumliche Verhältnisse geeignet. Verwendet wird Polizei-Adapter für Planfilm in Verbindung mit Linhof-Technika; die Orientierung erfolgt über eine Mattscheiben-Horizontale nach neuartigen Gesichtsmarkierungen. Es wird empfohlen, gegebenenfalls verschiedene Lippenhaltungen zu dokumentieren.

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Summary A method is described of making clinical photos without any cephalostatic instrument. Police Adapter for flat film together with Linhof-Technika is used; the orientation is given by means of a horizontal focusing screen in accordance with new face markings. It is advisable to document different lip postures.

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Résumé Il s'agit d'une méthode permettant de faire des photographies exactes sans l'aide d'un céphalostat et dans des conditions spatiales réduites. Le Polizei-Adapter pour film plat est utilisé avec la Linhof-Technika. L'orientation est donné par un verre dépoli horizontal en relation avec de nouveaux marquages faciaux. Il est recommandé de noter le cas échéant, différentes postures des lèvres.

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Mit 8 Abbildungen

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Herrn Prof. Dr. Dr. Th. Kirsch zum 60. Geburtstag     

Pilomatrixoma of the preauricular region

Pilomatrixoma is a relatively rare benign skin neoplasm, which is generally present as a single, asymptomatic dermal or subcutaneous nodule, which occurs most often in the first 2 decades of life with a higher incidence in females. The usual sites are the face and upper extremities. This paper describes a case of such a tumour presenting in the right preauricular region of a 14-year-old Japanese girl.     

The life of Henry Jeanneret (1802–1886). Pioneer Australian dentist

Henry Jeanneret was a pioneer Australian dentist, perhaps the first in this country to promote the discipline of dentistry as distinct from medicine and general surgery. This profile describes his early life and training, his emigration to Australia, his clinical practice in Sydney and in Van Diemen's Land, and his contributions to natural history, particularly in the field of botany.     

Myositis ossificans traumatica of the masseter muscle: Review of the literature and report of two additional cases

Myositis ossificans traumatica of the masseter muscle is uncommon. The condition is benign and results in reactive heterotopic bone formation, usually producing limitation of opening of the jaws. Radiographic and microscopic examination can confirm the diagnosis. Treatment of myositis ossificans traumatica of the masseter muscle is surgical, with other modalities used when occurring in other muscles of the body     

Characteristics of ''best'' and ''worst'' clinical teachers as perceived by university nursing faculty and students

This study identified and compared characteristics of 'best' and 'worst' clinical teachers as perceived by university nursing faculty and students. The Nursing Clinical Teacher Effectiveness Inventory (NCTEI) was distributed to 201 volunteer subjects. This survey instrument, developed by the authors, contains 48 clinical teacher characteristics grouped into five categories. Each participant was asked to rate, using the NCTEI, the 'best' and them the 'worst' clinical teacher from past observations. Results showed both groups perceived that being a good role model was the highest rated characteristic for 'best' teachers and the 'lowest' rated characteristic for 'worst' teachers. Faculty and students' perceptions were fairly similar as to highest rated characteristics of 'best' clinical teachers. Less agreement was noted about the characteristics of 'worst' clinical teachers. When categories of clinical teacher characteristics were compared, there were significant differences between the ratings of faculty and students for 'best' clinical teachers, but none for 'worst' clinical teachers.     

Treatment Strategies for Missing Maxillary Central Incisor—An Orthodontist's Perspective

The loss of maxillary central incisors at an early age has psychological, esthetic, and functional implications. Multiple treatment options are available for replacing missing central incisors. The management demands a multidisciplinary approach involving the orthodontist, prosthodontist, and periodontist. Treatment planning requires consideration of a variety of clinical and nonclinical factors. This clinical report attempts to demonstrate different strategies for the management of unilaterally and bilaterally missing central incisors.