Deutsche Zeitschrift fur Mund-, Kiefer- und Gesichts-Chirurgie最新文献

To minimize the effects of friction, the groove lengths of brackets and hence bracket widths should be selected accordingly. This implies that each tooth be seen not as one isolated tooth alone, but rather as part of the whole system. This basic consideration is of decisive importance for the optimum design of bracket size.

The insertion of bridging plates following mandibular resections is usually complicated by the unphysiological and incorrect axial position of the jaw stumps and by tensions resulting in necrosis of the covering tissues in the area of the reconstructive plate. With the aid of temporary intraoperative pin fixation using a minifixateur (small fixateur from the ASIF armamentarium for hand and forearm surgery) it was possible to maintain the physiological axial position of the jaw stumps during the operation.

A squamous cell carcinoma developed in a 66 year old patient in the region of a traumatically caused oro-antral fistula that has persisted for 40 years. The clinical course and histological findings are presented. Based on the few case reports in the literature the occurrence of malignancies in chronic traumatic fistulae is discussed. Reference is also made to causal relationships between such a fistula and malignancy under the aspect of forensic medical consultations.

Following part I "Fundamentals" and part II "Procedures", this third part presents the findings about language acquisition and the conditions governing this process in 315 CLP children. It has been shown that early language programs for CLP families leads to the linguistic rehabilitation of these children before they reach school age. Semantically and syntactically complex sentences at the age of 2-3 years results in good articulation at age 5-6. Early precision of articulation is usually associated with an increased risk for psychosomatic complications. The complexity of the cleft at birth is of minor importance for language acquisition, whereas early treatment, parents' compliance and avoidance of corrections and sensitizations are decisive for the successful course of the child's language development at the age of 5-6 years.

The aim of this study was to investigate the influence of different pins usually used for intraoperative root filling on periapical bone healing. In a specially designed animal experiment it was possible to evaluate biocompatibility simultaneously with the influence of varying materials on bone regeneration in standardized defects. Bioincompatible silver, acrylate and gutta percha root filling delay and impede bone regeneration. Biocompatible aluminium oxide ceramic and titanium pins do not have any influences on spontaneous bone regeneration. Reducing the defect, however, they do improve the conditions for complete bony regeneration.

In the present paper the long term results of 27 patients with clefts who had undergone primary osteoplasty at 3-10 months are presented in a cephalometric follow-up. A review of the literature shows that in comparison to cleft populations without primary osteoplasty there have been no differences in terms of maxillary development. Therefore primary osteoplasty cannot alone be made responsible for the disturbance of the growth of the maxilla as has been postulated in the early 70s. According to the Tübingen results consistent orthodontic therapy is necessary to prevent developmental anomalies.

Female WAG-Rij rats (160-180 g b.w.) were treated with Cisplatin (12.6 mg/kg b.w.) over 3 weeks. After chemotherapy a homologous freeze-dried carotid segment of 4 mm length was grafted in the right carotid artery. The evolution of the new prosthesis endothelium was observed by SEM. 4 weeks after the microsurgical treatment, the healing process and reendothelialization of the prosthesis was concluded in the control group. In the cisplatin group endothelial damages and irregularities of the pseudointima of the freeze-dried graft were found up to the sixth week after surgery. This may be the reason for thrombosis and a lower patency rate after chemotherapy.

Antithrombin III and protein C are the major inhibitors of the plasma clotting system. Since adequate thromboembolism protection requires a cofactor AT III for heparin to provide full antithrombotic coverage, the preoperative AT III and protein C levels in the plasma of 105 patients treated with marcumar are measured. The understanding of the physiological role of these inhibitors of the plasma clotting system and of the causes for their decrease should directly lead to the indications for laboratory analysis.

Most recently there seems to be a general turning away from the use of rectangular osteosynthesis miniplates in the treatment of maxillofacial fractures and in plastic surgery. Meanwhile a novel design based on circular arcs and connecting bars has been successfully employed. Its particular two-dimensional shape allows three-dimensional deformation without damaging the plates or the openings required for screw insertion. Apart from a reduced plate-bearing area and an increased torsional stability during adaptation to the bone surface, this new plate geometry and the complete system excells by its high tissue compatibility. This later characteristic is attributable to the choice of the bioinert material titanium, which has been processed into a special alloy.