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Biomedical subjects

J Prein

Publications and source records attributed to J Prein.

At least 37 records · Page 2Linked to original sources
PubMed1987

Mandibular reconstruction using AO plates.

The AO plate represents an acceptable reconstructive choice for mandibular defects, with an 86.7 percent success rate demonstrated in this series. Because this method utilizes an alloplast which is precisely and quickly applied, virtually all patients requiring mandibular resection can be considered candidates for reconstruction. Adequate vascularized soft tissue coverage is essential to prevent plate extrusion and fistula formation. This is even more important for radiated patients. The pectoralis major myocutaneous flap provides muscle and skin for large anterior defects. Frequently, lateral defects can be closed primarily without using regional flaps. We suggest bone reconstruction to avoid potential plate fracture and to allow placement of functional dentures. Resections in elderly patients and for palliation will result in ideal cosmetic and functional results with the plate alone. If we exclude the four patients reconstructed with calcium hydroxyapatite and the AO plate, the morbidity rate is quite acceptable. With this group excluded, only four fistulas and eight plate exposures occurred. Only four plate removals were required to achieve wound closure. Evaluation of the titanium plate is in progress. It is hoped that better osseous and soft tissue integration will help to decrease wound complications. A large prospective review of postoperative radiotherapy patients using the new titanium plate has been designed to address this issue. The therapeutic choice between the AO plate and free vascularized bone graft reconstruction remains. The decision process is dependent on the technical skills of the surgeon, the treatment plan, the survival characteristics of the tumor, and the physiologic condition of the patient.

Bone Plates↗
PubMed1987

Rigid internal fixation of mandibular fractures--basics of AO technique.

The main advantages and purposes of the AO approach are early active pain-free functional movement; avoidance of intermaxillary fixation; safe, secured airways without tracheotomies, especially in polytraumatized patients; and shorter periods of hospitalization. However, it is also an approach that requires strict adherence to technique to ensure success and safety.

Adult↗
PubMed1986

Lipomatosis of the neck (Madelung's neck).

Benign symmetrical lipomatosis of the neck is a rare disease that has to be differentiated from goiter, sialadenitis, obesity or a lymphatic tumor. Most patients are severe alcoholics, but they may have other endocrine disorders, such as diabetes mellitus, hyperuricemia, or hyperlipidemia. Aside from the cosmetic disfigurement and consequent psychological stress, respiratory distress may be the indication for surgical treatment. Excision of the lipomatosis requires technical skill because the extensive and sometimes infiltrative growth makes dissection of muscle and nerves difficult. The computer tomogram provides good information on the extent of the disease. Three of our 5 patients died 2 1/2 to 6 years after the first operation because of their primary disease.

Adult↗
PubMed1979

Ameloblastic fibroma and its sarcomatous transformation.

A case of ameloblastic fibroma, and one of its more aggressive variety, the ameloblastic "fibrosarcoma", are presented. The clinical and morphologic differences are discussed. In our opinion, ameloblastic "fibrosarcoma" is a semimalignant tumor. Therefore we propose "proliferating ameloblastic fibroma" as a more appropriate designation.

Adolescent↗
PubMed1976

[Functionally stable osteosynthesis of the mandible by means of an excentric-dynamic compression plate. Results of a follow-up of 25 cases].

The stability of internal fixation is enhanced by axial compression on the fracture ends. If internal fixation of the mandible is achieved by a compression plate at the lower border of the mandible (compression side), distraction of the fracture ends on the occlusal side occurs which has to be counteracted without damaging the roots of the teeth on the occlusal side (traction side) or without damaging the inferior alveolar nerve. From experiments on models it was seen that an acceptable solution to this problem is given by the use of the combined compression plate and tension band plate or the "Excentric Dynamic Compression Plate" (EDCP). In this paper 25 clinical cases of internal fixation of the mandible by means of the EDCP are examined and discussed. The following relevant facts were reviewed on all patients: -- kind of trauma -- age -- dentition -- localization of the fracture -- local and general additional injuries -- time of operation -- material used for internal fixation -- type of occlusal immobilisation during operation -- use of antibiotics -- skin closure -- mobilisation -- hospital stay -- duration of work disability -- complications -- scarring -- neurological disablement -- malocclusion In this paper emphasis is layed upon internal fixation by means of the EDCP. The clinical evaluation of the 25 cases clearly demonstrates that the main indication for internal fixation with the EDCP is given in fractures of the horizontal ramus of the mandible, because in this localisation the plate has to be applied beneath the inferior alveolar nerve. A further indication for internal fixation with the EDCP are fractures of the angle of the mandible. In these cases the tension band principle by means of a tension banc archbar or a tension band plate cannot be applied, because of missing teeth on the proximal fragment, or a non erupted wisdom tooth. These indications can be summarized as follows: -- In fractures of the angle of the mandible--when ever possible compression plate and tension band plate, otherwise EDCP -- In fractures of the horizontal ramus--EDCP -- In fractures of the mandibular front--DCP.

Bone Plates↗
PubMed1975

Benign osteoblastoma.

The eighth case of a benign osteoblastoma of the jawbones is presented. The tumor showed early recurrence after imcomplete curettage. The tumor-bearing part of the mandible was resected and reconstructed with an autologous bone graft. The histologic features of the entire specimen proved its benighn character. The patient is doing well 2 years after surgical treatment.

Adolescent↗