- Email: [email protected]
International Conference on management of fractures of the mandibular condyle. Groningen, The Netherlands, 5–6 September 1997
68
British
Journal
of Oral
and Maxillofacial
Surgery
activity of kallikrein in the selectively collected parotid saliva was not different in either of the groups. By contrast, the kallikrein activity seems to correlate with the size and duration of the defect. In view of the fact that the kallikrein system is involved in autoinflammatory processes and based on the present investigations, kallikrein seems to play an important role as a prognostic factor in osteoradionecrosis. To clarify this role should be the subject of further prospective studies.
diagnosis and following unsatisfactory therapy is reported. The surgical treatment by radical surgery, microsurgical defect closure and the histological features are discussed. Correspondence: Dr. med. Dr. med. dent. Thilo Prochno, Klinik und Pohklinik fur Mund-, Kiefer- und Gesichtschirurgie/Plastische Onerationen der Medizinischen FakultLt der HumboldtUniversitat zu Berlin (Charite), Schumannstr. 20/21, D-101 17 Berlin.
Mandibular
Mikrohiologische und immunhistologische Aspekte der prPpubertiiren Parodontitis beim Papillon-Lefevre-Syndrom. J. W. Kleinfelder, D. E. Lange, R F. Miiller, W. Bdcker. (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6).
A. Prietz.
bite force measurements in children. K. L. Gerlach, (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6).
In 125 children, aged 6 to 11 years, bite forces were measured among incisors, canines, bicuspids and molars. The results of 32 adults served as a control group. For the test a calibratable transducer was equipped with strain gauges whose resistivity changes in response to mechanical deformation. When this was connected to a Wheatstone bridge, bridge current changes could be determined during deformation and recorded with a single-channel recorder after electronic amplification. In this way masticatory forces could be measured directly. Depending on age, increasing loads were recorded between the incisors and molars, while the values between canines and bicuspids were decreasing. In the molar region the values ranged from 84 N at 6 years to 260 N at 11 years. This was equivalent to 20% and 62% of the mean values of the control group. Correspondence: Prof. Dr. Dr. K. L. Gerlach, Otto-von-GuerickeUniversitat Magdeburg, Medizinische Fakultat, Klinik fur Mund-, Kiefer- und Gesichtschirurgie, Leipziger Str. 44, D-39120 Magdeburg. Histological studies of resorbable poly-L-lactide screws in the GSttingen minipig. M. Fuchs, A. Schmid, Th. Krause, H.-A. Merten. (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6). In 20 minipigs an osteotomy of the lumbar spine at L-3 was fixed with resorbable implants made of poly-L-lactid. Up to 24 months postoperatively the cancellous bone surrounding the screws was examined histologically. Our investigations confirmed a long degradation period of poly-L-lactid and little inflammatory reaction particularly within the bone. The remodelling of the bone close to the screws ensues by the formation of osteons. Correspondence: Dr. med. Michael Fuchs, Klinik fur Unfallchirurgie, Plastische- und Wiederherstellungschirurgie, Universitlt Giittingen, Robert-Koch&rage 40, D-37075 Gottingen. Kutanes Leiomyosarkom T
Prochno,
F
Soost,
der Wange-Diagnostik turd Therapie. Audring. (Dtsch Z Mund Kiefer
H.
GesichtsChir 1996; 20: 6). Cutaneous leiomyosarcoma of the skin is a rare malignant tumour. A case of a second opinion based on an earlier incorrect histological
The following communication is a case history of an 11-year-old female patient suffering from Papillon-Lefevre syndrome. Since a massive occurrence of A. actinomycetemcomitans had been found in the subgingival microflora of the periodontal pockets, the patient was treated with repeated subgingival scaling, and an adjunct amoxicillin and metronidazol regimen. Fifteen months post-treatment clinical and radiographical improvement of the periodontal conditions is reported despite the recurrent finding of A. actinomycetemcomitans. An immunohistological examination of the gingival tissue showed a massive inflammatory infiltrate dominated by plasma- and immunoglobulin-producing cells resembling the typical histopathology of periodontal disease. Correspondence: Dr. Jiirg W. Kleinfelder, OA Poliklinik fur Parodontologie Westfalische Wilhelms-Universitat, Waldeyerstr. 30. D-48129 Miinster. International Conference on Management of Fractures of the Mandibular Condyle. Groningen, The Netherlands, 5-6 September 1997. (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6). Management of fractures of the mandibular condyle still deserves attention since there is no consensus on the most appropriate treatment modality. Is open reduction a superior method of treatment to closed reduction or is closed reduction a superior method of treatment to open reduction? Is it possible to predict which cases need open reduction and which cases need closed reduction? What is the best strategy for non-surgical management? What is the best surgical access and which osteosynthesis should be applied? The aim of this conference is to provide scientifically based answers on the many questions concerning management of fractures of the mandibular condyle. Issues like clinical and radiological diagnosis, surgical anatomy, surgical access,different osteosynthesis systems, rationale for surgical and non-surgical treatment, treatment outcome and management of non-successful treatment will be presented by an international faculty of experts. Facilities for practical exercises and (video) demonstrations are available. Correspondence: Dr. R. R. M. Bos, Department of Oral and Maxillofacial Surgery, University Hospital Groningen, PO Box 30.001, NL-9700 RB Groningen, The Netherlands. Tel. +31-50361 25 67. Fax +31-50-361 11 36.
British
Journal
of Oral
and Maxillofacial
Surgery
activity of kallikrein in the selectively collected parotid saliva was not different in either of the groups. By contrast, the kallikrein activity seems to correlate with the size and duration of the defect. In view of the fact that the kallikrein system is involved in autoinflammatory processes and based on the present investigations, kallikrein seems to play an important role as a prognostic factor in osteoradionecrosis. To clarify this role should be the subject of further prospective studies.
diagnosis and following unsatisfactory therapy is reported. The surgical treatment by radical surgery, microsurgical defect closure and the histological features are discussed. Correspondence: Dr. med. Dr. med. dent. Thilo Prochno, Klinik und Pohklinik fur Mund-, Kiefer- und Gesichtschirurgie/Plastische Onerationen der Medizinischen FakultLt der HumboldtUniversitat zu Berlin (Charite), Schumannstr. 20/21, D-101 17 Berlin.
Mandibular
Mikrohiologische und immunhistologische Aspekte der prPpubertiiren Parodontitis beim Papillon-Lefevre-Syndrom. J. W. Kleinfelder, D. E. Lange, R F. Miiller, W. Bdcker. (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6).
A. Prietz.
bite force measurements in children. K. L. Gerlach, (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6).
In 125 children, aged 6 to 11 years, bite forces were measured among incisors, canines, bicuspids and molars. The results of 32 adults served as a control group. For the test a calibratable transducer was equipped with strain gauges whose resistivity changes in response to mechanical deformation. When this was connected to a Wheatstone bridge, bridge current changes could be determined during deformation and recorded with a single-channel recorder after electronic amplification. In this way masticatory forces could be measured directly. Depending on age, increasing loads were recorded between the incisors and molars, while the values between canines and bicuspids were decreasing. In the molar region the values ranged from 84 N at 6 years to 260 N at 11 years. This was equivalent to 20% and 62% of the mean values of the control group. Correspondence: Prof. Dr. Dr. K. L. Gerlach, Otto-von-GuerickeUniversitat Magdeburg, Medizinische Fakultat, Klinik fur Mund-, Kiefer- und Gesichtschirurgie, Leipziger Str. 44, D-39120 Magdeburg. Histological studies of resorbable poly-L-lactide screws in the GSttingen minipig. M. Fuchs, A. Schmid, Th. Krause, H.-A. Merten. (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6). In 20 minipigs an osteotomy of the lumbar spine at L-3 was fixed with resorbable implants made of poly-L-lactid. Up to 24 months postoperatively the cancellous bone surrounding the screws was examined histologically. Our investigations confirmed a long degradation period of poly-L-lactid and little inflammatory reaction particularly within the bone. The remodelling of the bone close to the screws ensues by the formation of osteons. Correspondence: Dr. med. Michael Fuchs, Klinik fur Unfallchirurgie, Plastische- und Wiederherstellungschirurgie, Universitlt Giittingen, Robert-Koch&rage 40, D-37075 Gottingen. Kutanes Leiomyosarkom T
Prochno,
F
Soost,
der Wange-Diagnostik turd Therapie. Audring. (Dtsch Z Mund Kiefer
H.
GesichtsChir 1996; 20: 6). Cutaneous leiomyosarcoma of the skin is a rare malignant tumour. A case of a second opinion based on an earlier incorrect histological
The following communication is a case history of an 11-year-old female patient suffering from Papillon-Lefevre syndrome. Since a massive occurrence of A. actinomycetemcomitans had been found in the subgingival microflora of the periodontal pockets, the patient was treated with repeated subgingival scaling, and an adjunct amoxicillin and metronidazol regimen. Fifteen months post-treatment clinical and radiographical improvement of the periodontal conditions is reported despite the recurrent finding of A. actinomycetemcomitans. An immunohistological examination of the gingival tissue showed a massive inflammatory infiltrate dominated by plasma- and immunoglobulin-producing cells resembling the typical histopathology of periodontal disease. Correspondence: Dr. Jiirg W. Kleinfelder, OA Poliklinik fur Parodontologie Westfalische Wilhelms-Universitat, Waldeyerstr. 30. D-48129 Miinster. International Conference on Management of Fractures of the Mandibular Condyle. Groningen, The Netherlands, 5-6 September 1997. (Dtsch Z Mund Kiefer GesichtsChir 1996; 20: 6). Management of fractures of the mandibular condyle still deserves attention since there is no consensus on the most appropriate treatment modality. Is open reduction a superior method of treatment to closed reduction or is closed reduction a superior method of treatment to open reduction? Is it possible to predict which cases need open reduction and which cases need closed reduction? What is the best strategy for non-surgical management? What is the best surgical access and which osteosynthesis should be applied? The aim of this conference is to provide scientifically based answers on the many questions concerning management of fractures of the mandibular condyle. Issues like clinical and radiological diagnosis, surgical anatomy, surgical access,different osteosynthesis systems, rationale for surgical and non-surgical treatment, treatment outcome and management of non-successful treatment will be presented by an international faculty of experts. Facilities for practical exercises and (video) demonstrations are available. Correspondence: Dr. R. R. M. Bos, Department of Oral and Maxillofacial Surgery, University Hospital Groningen, PO Box 30.001, NL-9700 RB Groningen, The Netherlands. Tel. +31-50361 25 67. Fax +31-50-361 11 36.