Search results for " flaps"

Experimental investigations on a model of cryogenic edema.

1987

The role of mechanisms underlying formation and progression of vasogenic brain edema is investigated. On this purpose, cerebral edema was produced by cortical freezing in two different brain situations in rabbits (with or without replacement of bone flap). BBB (Blood-Brain Barrier) breakdown was evaluated by observation of Evans blue extravation, while a histopathological evaluation was carried out by light and transmission electron microscopy. Water content of brain tissue was determined by the wet/dry weight ratio method. Comparison of extension and intensity of cerebral edema between these two groups of animals shows a statistically significant difference: there was evidence of higher wa…

Comparison of two different lingual flap advancement techniques and vascular structure identification: a human cadaver study.

2022

Background: One of the most frequent complications in guided bone regeneration (GBR) is wound dehiscence, which compromises treatment outcomes. Thus, primary tension-free suture is essential to avoid wound dehiscence. The purpose of this study was to compare the extension of 2 different mandibular flaps in human cadaveric specimens, and to measure the size of the supraperiosteal blood vessels. Material and methods: Five freshly unfrozen human cadaveric specimens were used. Arteries and veins were marked and bilateral classical lingual flaps (extending from the second premolar to the retromolar area) were prepared. In one side, the mylohyoid muscle was detached to increase the coronal extens…

Searching for the right timing of surgical delay: angiogenesis, vascular endothelial growth factor and perfusion changes in a skin-flap model.

2009

Summary Background The angiogenic potential of vascular endothelial growth factor (VEGF) and its oxygen pressure-dependent regulation suggest a strong connection between this growth factor and the ‘delay phenomenon'. In this study we focused on the chronological changes in VEGF concentration and flap perfusion in order to optimise the duration of surgical delay. Methods The VEGF concentration in skin and underlying muscle was measured in oversized, random-pattern flaps on 38 male Sprague-Dawley rats after 3, 5 or 7 days of surgical delay. Additionally, flaps were raised 5 or 7 days past preconditioning. The effect on flap perfusion was measured using indocyanine green fluoroscopy and the si…

Perforator mapping in the trunk: a guide for freestyle flap surgery and an introduction to the sustainable anatomical study

2012

Introduction: Freestyle Perforator flaps minimize flap harvest morbidity and can be harvested anywhere in the body if perforators anatomy is well known. A study of trunk perforator vessels has been performed on recycled CT scans avoiding cadaver investigations or unnecessary radiation exposure. Materials and Methods: 200 CT scans, performed for the study of liver or pancreatic disease, were examined. No unnecessary radiation was administered. Previous abdominal surgery was reason of exclusion. The trunk between the xyphoid process and Downloaded by: Biomedische Bibliotheek 193.191.170.2 - 10/8/2014 8:35:28 AM Abstracts Eur Surg Res 2012;49:130–216 215 the umbilicus was studied. On axial sca…

The Double-Door Tongue Flap for Total Cheek Muscosa Defects

1988

Lining of total cheek mucosa defects can be accomplished by opening the tongue along its lateral border and preparing two myomucosa flaps that can be swung upward and downward like a double door to be sutured into the defect. The tongue is released 3 weeks later in a second-stage operation. The operation is quick and easy compared with other methods to achieve lining for such defects. Tongue function is not impaired after healing of the second-stage operation.

Eine neue experimentelle Methode zur Behandlung von Beckenwandrezidiven gynäkologischer Malignome

1989

Pelvic side wall recurrences of gynecological malignancies subsequent to primary or adjuvant radiation therapy have a bad prognosis, although in almost half of the cases, distant metastases are not present at the time of diagnosis of the local tumor progression. A radical operative resection of the pelvic wall recurrence is rarely possible and a second conventional percutaneous or intracavitary irradiation with a tumoricidal dose is no longer feasible, because of the limited radiation tolerance of the surrounding pelvic tissue. The different forms of chemotherapy applied at present are not curative. Based on considerations of tumor and radiation biology, we propose a new experimental treatm…

Treatment of Gingival Recession: When and How?

2021

Gingival recession is a common finding in daily clinical practice. Several issues may be associated with the apical shift of the gingival margin such as dentine hypersensitivity, root caries, non-carious cervical lesions (NCCLs), and compromised aesthetics. The first step in an effective management and prevention program is to identify susceptibility factors and modifiable conditions associated with gingival recession. Non-surgical treatment options for gingival recession defects include establishment of optimal plaque control, removal of overhanging subgingival restorations, behaviour change interventions, and use of desensitising agents. In cases where a surgical approach is indicated, co…

Management of Descemet's membrane haemorrhage after canaloplasty

2019

Objective, Noninvasive Evaluation of Velopharyngeal Function in Cleft and Noncleft Patients

1998

Objective The purpose of this study was to investigate a new diagnostic method that provides an approach to noninvasive, objective measurement of velopharyngeal movement by acoustic determination of epipharyngeal volume changes with velopharyngeal muscle function. Design This was a case control study, using consecutive samples. Setting This study took place at the Cleft Palate Rehabilitation Center of the University of Mainz, Germany. Patients Subjects were 29 consecutive cleft lip and palate (CLP) patients and 31 controls (21 patients with dysgnathia and 10 healthy volunteers). Intervention A series of transnasal acoustic measurements (pressure wave: 55 dB for 2 milliseconds) of epipharyng…

Anatomic basis for the dorsal radial flap of the thumb: clinical applications

1996

The pattern of the dorsal arterial supply of the thumb was studied by the dissection of 25 thumbs of fresh cadavers. A constant vascular axis was found, originating at the radial a. and communicating at the level of the middle third of the proximal phalanx with the arterial palmar circuit. The constant presence of this vascular axis and its connection with the palmar circuit permits the mobilisation of a dorsal metacarpal skin flap, with a distal pedicle and a reversed flow, that can be used for covering dorsal and palmar losses of substance in the thumb.