[Etiology and diagnostics of upper canine tooth retention].

Upper canines have significant esthetical and functional roles in the dental arch. Upper canine retention is a frequent anomaly as the germ develops rather far from its final place. Moreover, the neighboring teeth may narrow the place of the canine because of its late eruption.

[Mixed odontogenic tumors in children and adolescents].

Mixed odontogenic tumors in the jaws of children and adolescents usually cause dentition anomalies. The typical forms of these are ameloblastic fibroma, ameloblastic fibroodontoma, complex odontoma and compound odontoma. In the present study mixed odontogenic tumor cases are presented in patients under 20 years of age.

Skull base chordoma mimicking a preauricular neoplasm in a child: clinicopathological features and biological behaviour.

Introduction: The extreme rarity of chordomas in childhood, the slow growing nature of these tumours and the diverse symptoms may cause many diagnostic problems.

Patient: A 9-year-old girl presented with an unusual manifestation of a skull base chordoma. The clinical and pathological features were analysed.

[Gardner syndrome. Case reports].

The authors discuss 3 cases of Gardner-syndrome, outlining malignized large intestine polyposis, multiplex osteomas and the different skin tumours as the main features. The earliest symptoms suspecting the clinical picture are usually dental and/or mandibular lesions and draw the attention to the highly malignant polyposis.

[Gardner syndrome--on the basis of three cases].

Based on the 3 cases, the authors describe the Gardner-syndrome which is not so well-known in Hungary. The most important features of the Gardner syndrome are the malignized large intestine polyposis, the multiplex osteomies and the different skin tumours. The earliest symptoms suspecting the clinical picture, are usually dental and/or mandibular lesions.

[The value of beta-tricalcium-phosphate (CERASORB) in pre-prosthetic surgery].

Short- and medium-term experience with a pure-phase beta-tricalcium phosphate bone-substitute material (Cerasorb) is reported on the basis of clinical, radiological (panorama, 2-3D CT records) and histological examination on 52 patients. The treatment modes on these patients included the filling of cysts, sinus grafting, augmentation and the filling of parodontal lesions. Disturbance of wound healing was not observed in any of the cases, and both the radiological and the histological examinations revealed that transformation of the implanted beta-tricalcium phosphate into bone could be detected as early as in the second month.

Five-year 224-patient prospective histological study of clinical applications using a synthetic bone alloplast.

Clinical and histologic evaluations of a synthetic bone were performed in 224 patients in a well monitored environment. This material (Bioplant HTR, Bioplant Inc., South Norwalk, CT) was used to obliterate cysts, treat periodontal defects, correct jawbone contours and deficiencies, and gain sufficient support for the placement of dental implants in maxillary subantral augmentation.

[Experience with the clinical use of HTR (hard tissue replacement) polymer. Sinus elevation, human histological studies].

The HTR polymer was employed under clinical circumstances. Results supported that the HTR polymer may well be employed for bone replacement. The forming of the support tissue between the plastic granulums has been accompanied with biopsies.

[Dental x-ray pictures made by parallel and right-angle technics].

The long cone and its belonging film holder-centralizing system made by the Kentzler-Kaschner Dental GmbH (Ellwangen-Jagst, GFR) is well suitable to the right-angle technique. The system can simply be adapted to a number of X-ray apparatus. These technique decreases the distortion, the magnification and the radiation dose, increases the contrast of the pictures.

An animal model of radionuclide venography.

Experimental venous thrombi were created in 19 dogs, using either thrombin or sodium morrhuate. Eighteen thrombi (95%) were identified by radionuclide venography; however, an 85% false-positive rate was found when nonoperated limbs were studied. The models employed were considered unsuitable for studying the accuracy of labeled particles in diagnosing deep venous thrombosis for the reasons discussed in the text.