Gerd Gehrke

Publications of Gerd Gehrke

• Influence of lip closure on alveolar cleft width in patients with cleft lip and palate.

  Authors: Wolfgang Eichhorn, Marco Blessmann, Oliver Vorwig, Gerd Gehrke, Rainer Schmelzle, Max Heiland

  Head & face medicine. 01/2011; 7:3.

  The influence of surgery on growth and stability after treatment in patients with cleft lip and palate are topics still under discussion. The aim of the present study was to investigate the influenceThe influence of surgery on growth and stability after treatment in patients with cleft lip and palate are topics still under discussion. The aim of the present study was to investigate the influence of early lip closure on the width of the alveolar cleft using dental casts. A total of 44 clefts were investigated using plaster casts, 30 unilateral and 7 bilateral clefts. All infants received a passive molding plate a few days after birth. The age at the time of closure of the lip was 2.1 month in average (range 1-6 months). Plaster casts were obtained at the following stages: shortly after birth, prior to lip closure, prior to soft palate closure. We determined the width of the alveolar cleft before lip closure and prior to soft palate closure measuring the alveolar cleft width from the most lateral point of the premaxilla/anterior segment to the most medial point of the smaller segment. After lip closure 15 clefts presented with a width of 0 mm, meaning that the mucosa of the segments was almost touching one another. 19 clefts showed a width of up to 2 mm and 10 clefts were still over 2 mm wide. This means a reduction of 0% in 5 clefts, of 1-50% in 6 clefts, of 51-99% in 19 clefts, and of 100% in 14 clefts. Early lip closure reduces alveolar cleft width. In most cases our aim of a remaining cleft width of 2 mm or less can be achieved. These are promising conditions for primary alveolar bone grafting to restore the dental bony arch.

• Primary osteoplasty using calvarian bone in patients with cleft lip, alveolus and palate.

  Authors: Wolfgang Eichhorn, Marco Blessmann, Philipp Pohlenz, Felix A S Blake, Gerd Gehrke, Rainer Schmelzle, Max Heiland

  Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery. 09/2009;

  PURPOSE: The results of primary bone grafting in terms of initial cleft width, existence or absence of a lateral incisor and scar formation in the donor area are compared. METHODS: After primaryPURPOSE: The results of primary bone grafting in terms of initial cleft width, existence or absence of a lateral incisor and scar formation in the donor area are compared. METHODS: After primary osteoplasty with calvarian bone at an average age of 24 months (4-56 months) radiographic assessment was carried out in 31 patients with 40 alveolar clefts. The bone formation in the grafted area was assessed using dental radiographs taken at 66 months on average (13-114 months) after primary bone grafting. According to the Abyholm classification patients were assigned to 4 groups (indices I-IV) with indices I and II being rated as a success. RESULTS: We observed success (indices I and II) in 76% and poor results (index IV) in 14%. The causes for the poor results were an alveolar cleft width of 11-12mm in three cases, an extraction of a decayed deciduous tooth 17 months after bone grafting in one case and a traumatic transplant loss in another case. The non-existence of a lateral incisor and a broad cleft are related to poor results. CONCLUSION: Based on the results presented, primary bone grafting using calvarial bone seems to be a promising alternative in bridging narrow alveolar defects. This method allows early intervention at an age in which children do not recognize themselves as cleft patients. The preservation of the deciduous teeth is equally important regarding their functional stimulus for bone development.

• Conditioning of myocutaneous flaps.

  Authors: Wolfgang Eichhorn, Felix A S Blake, Philipp Pohlenz, Gerd Gehrke, Rainer Schmelzle, Max Heiland

  Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery. 02/2009;

  PURPOSE: The improvement of the ischaemic tolerance of myocutaneous flaps is of clinical importance and hence the subject of numerous investigations. METHODS: In an attempt to increase the ischaemicPURPOSE: The improvement of the ischaemic tolerance of myocutaneous flaps is of clinical importance and hence the subject of numerous investigations. METHODS: In an attempt to increase the ischaemic tolerance, 20 myocutaneous flaps (rectus abdominis muscle) in pigs were elevated and perfused with various, established solutions prior to the onset of ischaemia. The flaps were elevated, utilizing the superior epigastric vessels as the pedicle. Ten flaps were flushed with the University of Wisconsin solution, five with the Euro-Collins solution and the last five with a Ringer-Lactate solution, prior to the 6h long, normothermic ischaemia. On the day of operation, the first, third, fifth, seventh and tenth postoperative day clincical examinations and thermography were performed as well as biopsies. Additionally, on the tenth postoperative day, the rate of necrosis was determined morphometrically as the average of three measurements. RESULTS: Ten days after surgery, the flaps pretreated with the University of Wisconsin solution displayed a vital surface area of 89%, the Euro-Collins solution 23% and the Ringer-Lactate solution 14%. Histologically, muscle tissue proved to be more susceptible to ischaemia than skin. CONCLUSION: Regarding the rectus abdominis flap in a pig model, the University of Wisconsin solution proved superior in the prevention of ischaemic injury compared with the Euro-Collins solution and Ringer Lactate. In accordance with the literature, muscle tissue proved to be more susceptible to ischaemia than skin in our study.

• Survived crossbow injuries.

  Authors: Manfred George Krukemeyer, Willi Grellner, Gerd Gehrke, Emil Koops, Klaus Püschel

  The American journal of forensic medicine and pathology : official publication of the National Association of Medical Examiners. 10/2006; 27(3):274-6.

  The Hamburg University Institute of Legal Medicine presents 2 cases of injuries of crossbow arrows where the patients survived. Crossbows are used nowadays as sports and hunting weapons. They areThe Hamburg University Institute of Legal Medicine presents 2 cases of injuries of crossbow arrows where the patients survived. Crossbows are used nowadays as sports and hunting weapons. They are freely obtainable, and since people without practice can shoot them, there are constant injuries and fatal cases. Crossbow arrows have a high penetration force and can even pierce bone. Depending on the tip of the arrow used, they bore or cut through tissue, here damage to the tissue being restricted to the direct surroundings. Due to the elasticity of the tissue, the arrow shaft in the wound track may have the effect of an incomplete tamponade so that major hemorrhaging is prevented. In this condition, the injured person may be conscious and capacitated. From the medical viewpoint, crossbow arrows should therefore be invariably left in the wound, secured against displacement during transport, and only removed in the hospital.

• Conditioning of myocutaneous flaps

  Authors: Wolfgang Eichhorn, Felix A.S. Blake, Philipp Pohlenz, Gerd Gehrke, Rainer Schmelzle, Max Heiland

  Journal of Cranio-Maxillofacial Surgery.

  PurposeThe improvement of the ischaemic tolerance of myocutaneous flaps is of clinical importance and hence the subject of numerous investigations.MethodsIn an attempt to increase the ischaemicPurposeThe improvement of the ischaemic tolerance of myocutaneous flaps is of clinical importance and hence the subject of numerous investigations.MethodsIn an attempt to increase the ischaemic tolerance, 20 myocutaneous flaps (rectus abdominis muscle) in pigs were elevated and perfused with various, established solutions prior to the onset of ischaemia. The flaps were elevated, utilizing the superior epigastric vessels as the pedicle. Ten flaps were flushed with the University of Wisconsin solution, five with the Euro-Collins solution and the last five with a Ringer-Lactate solution, prior to the 6 h long, normothermic ischaemia. On the day of operation, the first, third, fifth, seventh and tenth postoperative day clincical examinations and thermography were performed as well as biopsies. Additionally, on the tenth postoperative day, the rate of necrosis was determined morphometrically as the average of three measurements.ResultsTen days after surgery, the flaps pretreated with the University of Wisconsin solution displayed a vital surface area of 89%, the Euro-Collins solution 23% and the Ringer-Lactate solution 14%. Histologically, muscle tissue proved to be more susceptible to ischaemia than skin.ConclusionRegarding the rectus abdominis flap in a pig model, the University of Wisconsin solution proved superior in the prevention of ischaemic injury compared with the Euro-Collins solution and Ringer Lactate. In accordance with the literature, muscle tissue proved to be more susceptible to ischaemia than skin in our study.

• Primary osteoplasty using calvarian bone in patients with cleft lip, alveolus and palate

  Authors: Wolfgang Eichhorn, Marco Blessmann, Philipp Pohlenz, Felix A.S. Blake, Gerd Gehrke, Rainer Schmelzle, Max Heiland

  Journal of Cranio-Maxillofacial Surgery.

  PurposeThe results of primary bone grafting in terms of initial cleft width, existence or absence of a lateral incisor and scar formation in the donor area are compared.MethodsAfter primaryPurposeThe results of primary bone grafting in terms of initial cleft width, existence or absence of a lateral incisor and scar formation in the donor area are compared.MethodsAfter primary osteoplasty with calvarian bone at an average age of 24 months (4–56 months) radiographic assessment was carried out in 31 patients with 40 alveolar clefts. The bone formation in the grafted area was assessed using dental radiographs taken at 66 months on average (13–114 months) after primary bone grafting. According to the Abyholm classification patients were assigned to 4 groups (indices I–IV) with indices I and II being rated as a success.ResultsWe observed success (indices I and II) in 76% and poor results (index IV) in 14%. The causes for the poor results were an alveolar cleft width of 11–12 mm in three cases, an extraction of a decayed deciduous tooth 17 months after bone grafting in one case and a traumatic transplant loss in another case. The non-existence of a lateral incisor and a broad cleft are related to poor results.ConclusionBased on the results presented, primary bone grafting using calvarial bone seems to be a promising alternative in bridging narrow alveolar defects. This method allows early intervention at an age in which children do not recognize themselves as cleft patients. The preservation of the deciduous teeth is equally important regarding their functional stimulus for bone development.