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1.
Folia Morphol (Warsz) ; 79(1): 120-126, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31621055

RESUMEN

BACKGROUND: The styloid process (SP) refers to a cylindrical piece projecting from the inferior of the temporal bone, situated anterior to the stylomastoid foramen. It is an anatomic formation close to major vessels and nerves, and its excessive elongation results in pathologies leading to anatomical disorders, such as Eagle's syndrome. Several studies have been conducted on SP in relation to its close proximity to vessels and nerves, but there is no study that reveals its distance to important anatomical formations, such as the internal auditory meatus (IAM), carotid canal (CC), cochlea, tegmen tympani (TT) and tragus. In the current study, we aimed to investigate the incidence of Eagle's syndrome based on morphometric measurements of SP. MATERIALS AND METHODS: The patient files archived in the Radiology Department of Adiyaman University Training and Research Hospital were retrospectively examined. The study was carried out on the data of patients for whom specialist radiologists found no pathology findings on the computed tomography images. A total of 77 individuals (36 females and 41 males) aged 22 to 54 years were included in the study. The length of SP and its distances to IAM, cochlea, CC, TT and tragus were obtained using computed tomography radiological measurements. RESULTS: When the individual measurements performed on computed tomography images were evaluated in men and women, no significant difference was found concerning the distance between SP and various anatomic structures in close proximity to SP (p > 0.05). However, there was a statistically significant difference between the genders in length of the right SP (p = 0.003) and left SP (p = 0.006). CONCLUSIONS: This anthropometric study revealed the standard morphometric measurements of SP. We believe that the data obtained will help clinicians to identify and diagnose pathologies more easily.


Asunto(s)
Hueso Temporal/anatomía & histología , Adulto , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Tomografía Computarizada por Rayos X , Adulto Joven
2.
Childs Nerv Syst ; 35(8): 1381-1384, 2019 08.
Artículo en Inglés | MEDLINE | ID: mdl-31115645

RESUMEN

PURPOSE: To evaluate the characteristics and outcomes of strabismus in patients with hydrocephalus. METHODS: A retrospective chart review of patients with strabismus and hydrocephalus is performed in the Department of Pediatric Ophthalmology between 2012 and 2018. RESULTS: Seventeen patients between the ages of 6 months and 13 years met the criteria of strabismus and hydrocephalus. Although all had developmental delay, five patients out of 17 were premature (lower than 36 weeks of gestation). All patients had ventriculoperitoneal shunt placement for congenital hydrocephalus. Three patients had exotropia, whereas 14 had esotropia. Glasses were prescribed to 13 patients: hyperopic correction in 12 and myopic correction in one patient. Surgical correction with bimedial recession was performed in five patients. Four of them achieved successful ocular alignment. CONCLUSIONS: Children with hydrocephalus most likely have esotropia. Although good ocular alignment is achieved with surgical correction in some patients, some patients may benefit from glasses.


Asunto(s)
Esotropía/etiología , Hidrocefalia/complicaciones , Adolescente , Niño , Preescolar , Esotropía/epidemiología , Esotropía/terapia , Anteojos , Femenino , Humanos , Lactante , Masculino , Procedimientos Quirúrgicos Oftalmológicos/métodos , Estudios Retrospectivos
3.
Med Oral Patol Oral Cir Bucal ; 23(3): e282-e289, 2018 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-29680848

RESUMEN

BACKGROUND: The aim of this retrospective study was to compare the morphological features of neurovascular canals and foramina of patients with medication-related osteonecrosis of the jaws (MRONJ) and healthy individuals by using cone beam computed tomography (CBCT). MATERIAL AND METHODS: The CBCT images of 58 patients under bisphosphonate therapy diagnosed with MRONJ and age gender- matched controls were retrospectively evaluated. The diameter of mandibular and nasopalatine canal and mandibular, mental and lingual foramina were measured on several sections of CBCT. The value of mental index (MI) and panoramic mandibular index (PMI) were also assessed. RESULTS: The mean value of diametric measurements for all neurovascular canals and foramina in MRONJ patients were narrower than controls. Left mandibular foramen was the most affected area (p<0.001). There were significantly difference in all measurements of mental foramen, lingual foramen and mandibular incisive canal between two groups (p<0.05). PMI of MRONJ subjects were also significantly differences in both sides (p<0.05). CONCLUSION: In MRONJ patient, neurovascular canals and foramina are affected due to the alterations in bone remodeling. Therefore, the diametric measurement of neurovascular canals and assessment of MI and PMI on CBCT, is a potentially useful method for detection of early changes associated with bisphosphonate therapy and for predict areas where new necrosis may occur.


Asunto(s)
Enfermedades Maxilomandibulares/inducido químicamente , Enfermedades Maxilomandibulares/patología , Mandíbula/irrigación sanguínea , Mandíbula/inervación , Maxilar/irrigación sanguínea , Maxilar/inervación , Osteonecrosis/inducido químicamente , Osteonecrosis/patología , Anciano , Anciano de 80 o más Años , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Mandíbula/patología , Maxilar/diagnóstico por imagen , Maxilar/patología , Persona de Mediana Edad , Tamaño de los Órganos , Estudios Retrospectivos
4.
Niger J Clin Pract ; 20(8): 1010-1019, 2017 08.
Artículo en Inglés | MEDLINE | ID: mdl-28891547

RESUMEN

OBJECTIVE: The defective diagnosis of alveolar structures is one of most serious handicaps when assessing available periodontal treatment options for the prevention of tooth loss. The aim of this research was to classify alveolar bone defects in the maxillary molar region which is a challenging area for dental implant applications. To our knowledge, this is the first study of periodontal bone defect prevalence by using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: In this study, the remaining alveolar bone patterns of 669 maxillary molars of 243 patients with periodontal bone loss were investigated on four aspects and the furcation areas of teeth, and then they were classified into six main groups. Combined periodontal-endodontic lesions (CPELs) were also reported in another category. RESULTS: Following exclusion of 39 (5.8%) teeth with CPEL, the most common group was horizontal bone defects (71.4%) and the least seen group was three-walled vertical bone defects (1.9%) in all alveolar bone sides of teeth. Osseous crater was found at the rate of 6.7% on interdental alveolar bone. Dehiscence and fenestration were detected at rates of 2.7% and 3.3%, respectively. In the assessment of furcation areas, there was no furcation involvement in 61.4% of all teeth and the rate of Grade-II involvements was 26.2%. CONCLUSIONS: The most appropriate treatment option may be decided through accurate imaging of periodontal defect morphology. CBCT can provide comprehensive information about the remaining alveolar bone structures. In this way, the need for dental implant can be prevented in many cases and be replaced with a more conservative approach on the maxillary molar region.


Asunto(s)
Pérdida de Hueso Alveolar/clasificación , Pérdida de Hueso Alveolar/diagnóstico por imagen , Tomografía Computarizada de Haz Cónico , Enfermedades Maxilares/diagnóstico por imagen , Adulto , Toma de Decisiones Clínicas , Femenino , Defectos de Furcación/diagnóstico por imagen , Humanos , Masculino , Persona de Mediana Edad , Diente Molar , Pérdida de Diente/prevención & control , Adulto Joven
5.
J Food Sci ; 76(2): C324-33, 2011 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-21535753

RESUMEN

UNLABELLED: Strawberry samples with enzyme activity and without enzyme activity (stannous chloride added) were measured for real-time formation of lipoxygenase (LOX) derived aroma compounds after 5 min pureeing using selected ion flow tube-mass spectrometry (SIFT-MS). The concentration of (Z)-3-hexenal and (E)-2-hexenal increased immediately after blending and gradually decreased over time, while hexanal concentration increased for at least 5 min in ground strawberries. The formation of hexanal was slower than the formation of (Z)-3-hexenal and (E)-2-hexenal in the headspace of pureed strawberries. The concentration of LOX aldehydes and esters significantly increased during refrigerated storage. Damaging strawberries increased the concentration of LOX aldehydes but did not significantly affect the concentration of esters. The concentrations of many of the esters were strongly correlated to their corresponded acids and/or aldehydes. The concentration of LOX-generated aldehydes decreased during ripening, while fruity esters increased. Different varieties had different aroma profiles and esters were the greatest percentage of the volatiles. The aroma release of some of the LOX-derived aldehydes in the mouthspace in whole strawberries compared to chopped strawberries showed that these volatiles are formed in the mouth during chewing. The persistence of LOX-derived compounds was higher than esters after swallowing. The mouthspace after and before swallowing persistence ratio of esters decreased as the chain length of the acid part of the ester compounds increased in whole strawberries. PRACTICAL APPLICATION: The storage studies showed that the concentrations of fruity and fresh volatiles increased during ripening and storage while damaging only increases the fresh volatiles. The nose, mouth, and headspace information can be used in the flavor industry to improve the formula of natural strawberry flavor by considering human perception during eating.


Asunto(s)
Deglución , Conservación de Alimentos/métodos , Fragaria/enzimología , Masticación , Compuestos Orgánicos Volátiles/metabolismo , Adulto , Aldehídos/análisis , Ésteres/análisis , Femenino , Frutas/metabolismo , Humanos , Lipooxigenasa/metabolismo , Espectrometría de Masas , Olfato , Gusto , Compuestos de Estaño/metabolismo
6.
West Indian med. j ; 59(2): 215-218, Mar. 2010. tab
Artículo en Inglés | LILACS | ID: lil-672601

RESUMEN

Previous researchers have shown that there exists an interaction between gingival blood flow and gingival health. The purpose of this study was to compare the papillary blood flow at sites treated by a bridge with the blood flow at untreated sites. Twenty persons with resin-bonded fixed partial dentures were included in the study. The contralateral natural teeth of the site symmetrical to that of the restorations were used as controls. Blood flow was measured from the middle point of the papillae from both test and control sites by Laser Doppler Flowmetry (LDF). The plaque index, papillary bleeding index and probing depth measurements were recorded. There was a statistically significant difference between the test and control sites in papillary blood flow measurements and clinical indices (p < 0.05). Moreover, there was statistical significance between gingival blood flow measurements and papillary bleeding index in the experimental group (p < 0.05). In short, there exists an important relationship between resin-bonded fixed partial dentures and papillary blood flow. Although there were no correlations between LDF values and clinical parameters, it can be emphasized, within the limits of the study, that LDF readings have limited diagnostic value, at least when it comes to clinical performance of fixed prosthesis.


Investigadores anteriores han mostrado que existe una interacción entre el flujo de sangre gingival y la salud gingival. El propósito de este estudio fue comparar el flujo de sangre papilar en los sitios tratado por un puente, con el flujo de la sangre en los sitios no tratados. Veinte personas con prótesis dental parcial fija adherida con resina fueron incluidas en el estudio. Los dientes naturales contralaterales del sitio simétrico al de las restauraciones, se usaron como controles. El flujo de sangre se midió a partir del punto medio de las papilas de los sitios de prueba y de control, usando un medidor de flujo mediante Láser Doppler (LDF). Se registraron el índice de la placa, el índice de sangramiento papilar, y las mediciones para el examen de la profundidad. Hubo una diferencia estadísticamente significativa entre los sitios de la prueba y los de control en las mediciones del flujo de sangre papilar y los índices clínicos (p <0.05). Más aún: hubo una diferencia estadísticamente significativa entre las mediciones del flujo de sangre gingival y el índice de sangramiento papilar en el grupo del experimento (p <0.05). En resumen, existe una relación importante entre la prótesis dental parcial fija adherida con resina y el flujo de sangre papilar. Aunque no había ninguna correlación entre los valores de LDF y los parámetros clínicos, puede subrayarse - dentro de los límites del estudio - que las lecturas de LDF tienen un valor diagnóstico limitado, al menos cuando se trata del funcionamiento clínico de la prótesis fija.


Asunto(s)
Adulto , Femenino , Humanos , Masculino , Persona de Mediana Edad , Adulto Joven , Dentadura Parcial Fija con Resina Consolidada , Encía/irrigación sanguínea , Salud Bucal , Placa Dental , Flujometría por Láser-Doppler , Flujo Sanguíneo Regional
7.
West Indian Med J ; 59(2): 215-8, 2010 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-21275129

RESUMEN

Previous researchers have shown that there exists an interaction between gingival blood flow and gingival health. The purpose of this study was to compare the papillary blood flow at sites treated by a bridge with the blood flow at untreated sites. Twenty persons with resin-bonded fixed partial dentures were included in the study. The contralateral natural teeth of the site symmetrical to that of the restorations were used as controls. Blood flow was measured from the middle point of the papillae from both test and control sites by Laser Doppler Flowmetry (LDF). The plaque index, papillary bleeding index and probing depth measurements were recorded. There was a statistically significant difference between the test and control sites in papillary blood flow measurements and clinical indices (p < 0.05). Moreover there was statistical significance between gingival blood flow measurements and papillary bleeding index in the experimental group (p < 0.05). In short, there exists an important relationship between resin-bonded fixed partial dentures and papillary blood flow. Although there were no correlations between LDF values and clinical parameters, it can be emphasized, within the limits of the study, that LDF readings have limited diagnostic value, at least when it comes to clinical performance of fixed prosthesis.


Asunto(s)
Dentadura Parcial Fija con Resina Consolidada , Encía/irrigación sanguínea , Salud Bucal , Adulto , Placa Dental , Femenino , Humanos , Flujometría por Láser-Doppler , Masculino , Persona de Mediana Edad , Flujo Sanguíneo Regional , Adulto Joven
8.
Head Neck ; 23(10): 836-43, 2001 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-11592230

RESUMEN

BACKGROUND: Wide resection of tumors of the middle third of the face often results in complex three-dimensional defects and facial paralysis either due to removal of the facial nerve within the tumoral tissue or to extensive resection of the facial muscles. METHODS: We report the cases of three patients who underwent wide excision of tumors of the cheek region, operations that resulted in tissue defects and facial palsy. Defect reconstruction and facial reanimation was accomplished in one stage through functional muscle transplantation. RESULTS: Follow-up of more than 1 year showed good symmetry at rest and reanimation of the corner of the mouth in all cases, but one patient, in which the ipsilateral facial main trunk was used as motor nerve supply to the transplanted muscle, developed significant muscle contracture and binding of the cheek skin. CONCLUSIONS: Every effort should be made to optimize the functional and cosmetic outcomes of neurovascular muscle transfers through precise planning and careful execution of the intricate details of the surgical technique for muscle transplantation.


Asunto(s)
Parálisis Facial/cirugía , Neoplasias de Cabeza y Cuello/cirugía , Procedimientos de Cirugía Plástica , Complicaciones Posoperatorias/cirugía , Colgajos Quirúrgicos , Adolescente , Adulto , Parálisis Facial/etiología , Hamartoma/cirugía , Humanos , Masculino , Neoplasias Mandibulares/cirugía , Neurofibromatosis/cirugía , Osteosarcoma/cirugía
9.
J Biomed Mater Res ; 51(3): 500-3, 2000 Sep 05.
Artículo en Inglés | MEDLINE | ID: mdl-10880094

RESUMEN

A natural polysaccharide, chitosan (poly-N-acetyl glucosaminoglycan), which is a nontoxic and bioabsorbable polymer, has been shown to have hemostatic and antibacterial effects. An amino acid, taurine, is considered to be beneficial for regulating the inflammation process. The purpose of this study was to investigate the synergistic effects of taurine and chitosan in the experimental defects at the vestibular bone of maxillary canine teeth in six dogs. Chitosan films were prepared as delivery system with or without taurine and placed in the randomly chosen defects. Biopsies were performed on the postoperative seventh day and routine histological procedures were performed for light and electron microscopic evaluations. For each group, 30 different microscopic areas were examined and the numbers of macrophages and neutrophils in these areas were counted. The mean numbers of both macrophages and neutrophils were found statistically different between the chitosan film incorporated with taurine and free chitosan groups (p < 0.0001 p > 0.05). In addition to the increase in cell counts in both groups, the cytological alterations were more obvious in the chitosan film group incorporated with taurine. Accordingly, taurine appears to enhance the acceleration effect of chitosan on wound healing at early periods. This effect could be considered beneficial in tissue repair in destructive diseases like periodontitis.


Asunto(s)
Antioxidantes/administración & dosificación , Materiales Biocompatibles , Quitina/análogos & derivados , Taurina/administración & dosificación , Cicatrización de Heridas/efectos de los fármacos , Animales , Quitosano , Perros , Sistemas de Liberación de Medicamentos , Femenino , Macrófagos/patología , Ensayo de Materiales , Microscopía Electrónica , Neutrófilos/patología , Periodontitis/tratamiento farmacológico , Periodontitis/patología , Periodoncio/efectos de los fármacos , Periodoncio/lesiones , Periodoncio/fisiología
10.
Plast Reconstr Surg ; 105(4): 1304-13, 2000 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-10744219

RESUMEN

Conventional osteomyocutaneous flaps do not always meet the requirements of a composite defect. A prefabricated composite flap may then be indicated to custom create the flap as dictated by the complex geometry of the defect. The usual method to prefabricate an osteocutaneous flap is to harvest a nonvascularized bone graft and place it into a vascular territory of a soft tissue, such as skin, muscle, or omentum, before its transfer. The basic problem with this method is that the bone graft repair is dependent on the vascular carrier; the bone needs to be revascularized and regenerate. The bone graft may not be adequately perfused at all, even long after the transfer of the prefabricated flap. This study was designed to prefabricate an osteocutaneous flap where simply the bone nourishes the soft tissues, in contrast to the conventional technique in which the soft tissue supplies a bone graft. This technique is based on the principle of vascular induction, where a pedicled bone flap acts as the vascular carrier to neovascularize a skin segment before its transfer. Using a total of 40 New Zealand White rabbits, two groups were constructed as the experimental and control groups. In the experimental group, a pedicled scapular bone flap was induced to neovascularize the dorsal trunk skin by anchoring the bone flap to the partially elevated skin flap with sutures in the first stage. After a period of 4 weeks, the prefabricated composite flaps (n = 25) were harvested as island flaps pedicled on the axillary vessels. In the control group, nonvascularized scapular bone graft was implanted under the dorsal trunk skin with sutures; after 4 weeks, island composite flaps (n = 15) were harvested pedicled on the cutaneous branch of the thoracodorsal vessels. In both groups, viability of the bony and cutaneous components was evaluated by means of direct observation, bone scintigraphy, measurement of bone metabolic activity, microangiography, dye injection study, and histology. Results demonstrated that by direct observation on day 7, the skin island of all of the flaps in the experimental group was totally viable, like the standard axial-pattern flap in the control group. Bone scintigraphy revealed a normal to increased pattern of radionuclide uptake in the experimental group, whereas the bone graft in the control group showed a decreased to normal pattern of radioactivity uptake. The biodistribution studies revealed that the mean radionuclide uptake (percent injected dose of 99mTc methylene diphosphonate/gram tissue) was greater for the experimental group (0.49+/-0.17) than for the control group (0.29+/-0.15). The difference was statistically significant (p<0.01). By microangiography, the cutaneous component of the prefabricated flap of the experimental group was observed to be diffusely neovascularized. Histology demonstrated that although the bone was highly vascular and cellular in the experimental group, examination of the bone grafts in the control group revealed necrotic marrow, empty lacunae, and necrotic cellular debris. Circulation to the bone in the experimental group was also demonstrated by India ink injection studies, which revealed staining within the blood vessels in the bone marrow. Based on this experimental study, a clinical technique was developed in which a pedicled split-inner cortex iliac crest bone flap is elevated and implanted under the medial groin skin in the first stage. After a neovascularization period of 4 weeks, prefabricated composite flap is harvested based on the deep circumflex iliac vessels and transferred to the defect. Using this clinical technique, two cases are presented in which the composite bone and soft-tissue defects were reconstructed with the prefabricated iliac osteomyocutaneous flap. This technique offers the following advantages over the traditional method of osteocutaneous flap prefabrication. Rich vascularity of the bony component of the flap is preserved following transfer (i.e. (ABSTRACT


Asunto(s)
Trasplante Óseo/métodos , Microcirugia/métodos , Neovascularización Fisiológica/fisiología , Colgajos Quirúrgicos/irrigación sanguínea , Adulto , Animales , Huesos/irrigación sanguínea , Mejilla/lesiones , Traumatismos de la Mano/cirugía , Humanos , Masculino , Microcirculación/fisiología , Conejos , Flujo Sanguíneo Regional/fisiología , Reoperación , Traumatismos de los Tejidos Blandos/cirugía , Heridas por Arma de Fuego/cirugía
11.
Eur J Obstet Gynecol Reprod Biol ; 87(1): 35-7, 1999 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-10579614

RESUMEN

OBJECTIVE: Reassignment surgery of the female-to-male transsexual is a rarely performed surgical procedure that should involve a gynecologist's consultation and expertise. This study examines the experience with this type of surgery at Baskent University Hospital, Ankara, Turkey, from the gynecologists' point of view. STUDY DESIGN: Eight patients underwent laparoscopically assisted vaginal hysterectomy, bilateral salpingo-oophorectomy and total vaginectomy, followed by phallic construction. Patients were followed up for 9 to 30 months post-surgery. RESULTS: The average operative time for total vaginectomy and laparoscopically assisted vaginal hysterectomy and bilateral salpingo-oophorectomy was 2 h and 20 min. The estimated average blood loss was 250 ml. Other than one bladder perforation, which was repaired immediately and healed uneventfully, we encountered no operative or postoperative complications linked to the gynecologic surgery. CONCLUSION: Laparoscopy seems to be useful in female-to-male transsexual surgery in allowing the preservation of structures vital for phallic construction, such as inferior epigastric vessels and the rectus abdominis muscle. The application of vaginectomy awaits justification through long-term follow-up studies of transsexuals who have undergone colpocleisis.


Asunto(s)
Histerectomía Vaginal , Transexualidad/cirugía , Vagina/cirugía , Pérdida de Sangre Quirúrgica , Trompas Uterinas/cirugía , Femenino , Humanos , Laparoscopía , Ovariectomía , Factores de Tiempo
12.
Burns ; 25(6): 553-7, 1999 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-10498368

RESUMEN

The management of postburn lower eyelid ectropion is difficult, since the contraction of the skin graft may give rise to secondary deformities especially around the lateral 1/3 of the lower eyelid. In this paper, the results of reconstruction in lower eyelid ectropion with a laterally based orbicularis oculi myocutaneous flap from the upper eyelid in 7 young patients are presented. Satisfactory function and cosmesis were obtained in the evaluation of the patients up to 40 months follow-up. The method proved versatile as the donor scar was well-hidden in the supratarsal fold and the temporally based myocutaneous flap provided additional support to the lower eyelid by exerting an upward pull against the gravity. It is concluded that usage of this flap in postburn ectropion cases is worthwhile to avoid any recurrences. reserved.


Asunto(s)
Blefaroplastia/métodos , Ectropión/cirugía , Quemaduras Oculares/complicaciones , Párpados/cirugía , Colgajos Quirúrgicos , Adolescente , Adulto , Niño , Ectropión/etiología , Músculos Faciales/trasplante , Femenino , Estudios de Seguimiento , Humanos , Masculino , Músculos Oculomotores/trasplante , Estudios Retrospectivos
13.
J Oral Sci ; 41(2): 57-60, 1999 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-10453127

RESUMEN

Guided tissue regeneration procedures using resorbable membranes have become accepted therapy for treating periodontal defects. Resorbable collagen and synthetic polylactide and polyglycolide copolymer membranes have been found to support regeneration and preclude the need for surgical removal. This study was undertaken to assess and compare the initial attachment of human gingival fibroblast cells to four collagen-based membranes (fascia lata, fascia temporalis, dura mater, and Type I bovine collagen) and a synthetic polylactic acid-based membrane (resolut). Human gingival fibroblasts were grown from explants of normal tissue obtained during surgical reduction of retromolar tissues. Membrane specimens were placed in separate culture wells and incubated with fibroblasts for one hour. The number of adherent cells was evaluated by light microscopy using an ocular grid system and detailed examination was performed by scanning electron microscopy. The results of evaluation by light microscopy indicated that initial cell attachment was significantly less in the polylactic acid-based membrane group than in the collagen-based membrane groups (P < 0.01). However, no significant differences were found among the collagen membrane groups in terms of fibroblast attachment (P > 0.01). Scanning electron microscopy examination of fibroblasts cultured directly on barrier membranes indicated that the collagen-based membranes appeared to facilitate cell attachment, whereas the polylactic acid-based membrane exhibited a morphology that was not conducive to attachment of human gingival fibroblasts. Based on these limited in vitro results, it appears that collagen-based membranes offer greater potential than polylactic acid-based membranes for guided tissue regeneration at surgical sites.


Asunto(s)
Implantes Absorbibles , Encía/citología , Membranas Artificiales , Implantes Absorbibles/estadística & datos numéricos , Adhesión Celular , Células Cultivadas , Fibroblastos/citología , Regeneración Tisular Guiada Periodontal , Humanos , Microscopía Electrónica de Rastreo
14.
J Reconstr Microsurg ; 15(1): 31-5, 1999 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-10025528

RESUMEN

The problem of vessel-size discrepancy is still unsolved in microvascular-free tissue transfers. In an effort to develop a technique perioperatively to dilate smaller vessel diameters, the authors utilized a catheter customarily used in coronary angioplasties, the percutaneous transluminal coronary angioplasty (PTCA) catheter. Twenty New Zealand rabbits were divided into two groups: Group 1 consisted of 14 experimental animals; Group 2 of six control animals. In both groups, a segmental defect of 2 cm was created in the proximal portion of the femoral artery just below the inguinal ligament, where the vessel diameter is 2.0+/-0.1 mm. In Group 1 animals, an arterial graft was harvested from the superficial femoral artery in the contralateral lower extremity, where the vessel diameter is 1.0+/-0.1 mm. The arterial graft along its entire length was dilated, using a PTCA catheter up to 2 mm in diameter. The duration of dilation was 3 min with pressure applied at 2.5 atm. Before and following dilation, sections were obtained from both ends of the graft for histologic comparison. The grafts were then interposed within the defect and microvascular anastomoses were performed. In the control group, an arterial graft of the same length as in the experimental group was harvested from the contralateral upper femoral region, where the vessel diameter is 2.0+/-0.1 mm. These grafts were then interposed within the defect and microsurgically anastomosed. Seven days later, the patency of the anastomoses was evaluated in both groups. In 13 of 14 rabbits in the experimental group, the anastomoses were patent and the arterial grafts maintained their dilated diameters (2 mm). In all six control animals, the anastomoses were patent. A statistical comparison of vessel patency using Fischer's exact chi-square test showed no significant differences between the experimental and control groups (p = 0.7). Histologically, the dilated arteries demonstrated intact endothelial layers.


Asunto(s)
Angioplastia Coronaria con Balón , Arteria Femoral/cirugía , Procedimientos Quirúrgicos Vasculares/instrumentación , Anastomosis Quirúrgica/instrumentación , Anastomosis Quirúrgica/métodos , Animales , Modelos Animales de Enfermedad , Arteria Femoral/patología , Oclusión de Injerto Vascular/prevención & control , Supervivencia de Injerto , Conejos , Valores de Referencia , Factores de Tiempo , Trasplante de Tejidos/métodos , Grado de Desobstrucción Vascular , Procedimientos Quirúrgicos Vasculares/métodos
16.
Microsurgery ; 18(3): 189-91, 1998.
Artículo en Inglés | MEDLINE | ID: mdl-9727933

RESUMEN

A case of penile amputation in a heavy smoker who was treated by microsurgical replantation is presented. The penis was cut by a kitchen knife and the ischaemia time until revascularisation was 3 hours. Following successful microneurovascular repair the penis survived. However, a 3 cm portion of the ventral segment, including the corresponding urethral segment, sloughed. The adverse effects of nicotine on vascular anastomotic network in heavy smokers are well known and may be the cause of the partial necrosis in this case.


Asunto(s)
Amputación Traumática/cirugía , Pene/lesiones , Pene/cirugía , Reimplantación , Fumar/efectos adversos , Adulto , Humanos , Masculino , Necrosis , Pene/patología , Periodo Posoperatorio , Insuficiencia del Tratamiento
17.
Br J Plast Surg ; 51(7): 566-8, 1998 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-9924415

RESUMEN

Total, full thickness loss of the upper eyelid due to trauma, was reconstructed using the Mustardé total upper lid reconstruction method. The immobile flap was then anchored to the avulsed levator muscle at a second stage, using the technique described by Collin and O'Donnell for the correction of eyelid ptosis. We modified the technique by using two rows of anchor sutures instead of one and found it effective in raising the reconstructed eyelid in the traumatic case presented.


Asunto(s)
Blefaroplastia/métodos , Párpados/lesiones , Párpados/cirugía , Músculo Esquelético/cirugía , Accidentes de Tránsito , Anciano , Femenino , Humanos , Colgajos Quirúrgicos , Técnicas de Sutura
18.
Plast Reconstr Surg ; 99(6): 1666-74, 1997 May.
Artículo en Inglés | MEDLINE | ID: mdl-9145137

RESUMEN

The purpose of this study was to explore the possible use of an allogeneic vascular source for flap fabrication. Epigastric fascia with its superficial epigastric vessel pedicle was harvested from the donor rat and microsurgically revascularized in the recipient rat across a major histocompatibility barrier. ACI rats (Rtl-a) served as donors, and Lewis rats (Rtl-1) served as recipients. The recipient rat was immunosuppressed with a daily dose of 2 mg/kg cyclosporin A plus 5 mg/kg prednisone for 4 weeks. Three experiments were performed for skin, muscle, and bone studies. In experiment 1 (20 Lewis rats), placement of the allotransplanted fascia underneath the epigastric skin significantly improved the survival of a random epigastric skin flap raised 3 weeks later (7.35 +/- 0.65 cm2 versus 6.09 +/- 0.90 cm2, p < 0.05). Immunosuppression was discontinued 10 days after flap elevation with no observable additional skin necrosis. In experiment 2 (13 Lewis rats) and experiment 3 (14 Lewis rats), segments of isogeneic muscle and bone were grafted successfully on the allotransplanted fascia, respectively. The survival of these grafts was confirmed by metabolic bone activity, bone labeling, microangiography, and histologic studies and further confirmed 2 weeks after cessation of immunosuppression. An allotransplanted fascia as a vascular source proved in this model its capability to improve the survival of a random skin flap and to accept a free bone or muscle graft with temporary immunosuppression. These findings hold promise for possible use of an allogeneic vascular source in flap fabrication.


Asunto(s)
Fascia/trasplante , Refuerzo Inmunológico de Injertos , Supervivencia de Injerto , Inmunosupresores/administración & dosificación , Colgajos Quirúrgicos/inmunología , Animales , Trasplante Óseo/inmunología , Fascia/irrigación sanguínea , Histocompatibilidad , Masculino , Músculo Esquelético/trasplante , Ratas , Ratas Endogámicas ACI , Ratas Endogámicas Lew , Trasplante Homólogo/inmunología , Trasplante Isogénico/inmunología
20.
J Marmara Univ Dent Fac ; 2(4): 588-98, 1997 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-9569783

RESUMEN

The purpose of this research was to evaluate the effectiveness of combined root surface conditioning with tetracycline HCI, fibrin sealing system, guided tissue regeneration procedure and coronal sliding flap application in the treatment of localized gingival recessions. The present study was conducted on 10 patients with localized facial recessions of at least 3mm. A trapezium-shaped flap was elevated apically to the margin of the bone dehiscence and the root surface was thoroughly scaled by hand instruments and burs. Tetracycline HCI (pH 1.9) solution was then topically applied for 5 minutes and the root surface thoroughly rinsed with sterile saline. A collagen membrane was trimmed and shaped to cover the entire root surface and later removed and a fibrin sealing system injected onto the root surface. Immediately membrane was placed again on the root surface without applying any pressure. The flap was sutured in the coronal position to completely cover the root surface and membrane. Control group patients were treated with only coronal sliding flap operation. Sutures were removed 10 days after surgery. Patients were clinically reevaluated 6 months postoperatively. The mean amount of root surface coverage obtained was similar in the test and control groups (test = 71.7%; control = 68.55%) but the clinical attachment gain (test = 4.21mm; control = 2.86mm) and pocket depth variations (test = 1.14mm reduction; control = 0.07mm reduction) differed significantly (P < 0.001). This study found promising healing of localized gingival recessions to result from a combined use of tetracycline HCI root demineralization, fibrin sealing system application, guided tissue regeneration procedure and coronal sliding flap operation.


Asunto(s)
Colágeno/uso terapéutico , Adhesivo de Tejido de Fibrina/administración & dosificación , Recesión Gingival/terapia , Regeneración Tisular Guiada Periodontal/métodos , Membranas Artificiales , Acondicionamiento de Tejidos Dentales/métodos , Raíz del Diente , Administración Tópica , Adulto , Terapia Combinada , Femenino , Regeneración Tisular Guiada Periodontal/estadística & datos numéricos , Humanos , Masculino , Persona de Mediana Edad , Tetraciclina/administración & dosificación , Acondicionamiento de Tejidos Dentales/estadística & datos numéricos
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