RESUMEN
PURPOSE: To compare bone healing in mandibular vertical body osteotomies (MVBO) after fixation with a resorbable 2.0mm-profile fixation system in the first and third postoperative months in rabbits. METHODS: Twenty hemimandibles of ten rabbits were divided into two groups according to duration of resorbable fixation-one or three months. The MVBOs were performed and one four-hole, resorbable, 2.0mm mini-plate fixation system was used on each side. The computed tomography (CT) scans, scanning electron microscopy (SEM), and histomorphometric outcomes of groups I and II were compared. RESULTS: Significant differences were found between the one- and three- month assessments in terms of newly formed bone ratio values (p<0.05). There was more new bone formation at the third month on both the CT and histomorphometric examinations. A better adaptation of the bone tissues to the resorbable mini-plate and screws was observed on SEM at three months. CONCLUSION: The resorbable mini-plates provided a fixation stable enough to allow immediate oral alimentation and callus formation in both groups.
Asunto(s)
Implantes Absorbibles , Fijadores Internos , Osteotomía Mandibular/rehabilitación , Cicatrización de Heridas/fisiología , Animales , Remodelación Ósea/fisiología , Huesos/patología , Huesos/ultraestructura , Femenino , Osteotomía Mandibular/instrumentación , Microscopía Electrónica de Rastreo/métodos , Modelos Animales , Osteogénesis/fisiología , Periodo Posoperatorio , Conejos , Tomografía Computarizada por Rayos X/métodosRESUMEN
ABSTRACT PURPOSE: To compare bone healing in mandibular vertical body osteotomies (MVBO) after fixation with a resorbable 2.0mm-profile fixation system in the first and third postoperative months in rabbits. METHODS: Twenty hemimandibles of ten rabbits were divided into two groups according to duration of resorbable fixation-one or three months. The MVBOs were performed and one four-hole, resorbable, 2.0mm mini-plate fixation system was used on each side. The computed tomography (CT) scans, scanning electron microscopy (SEM), and histomorphometric outcomes of groups I and II were compared. RESULTS: Significant differences were found between the one- and three- month assessments in terms of newly formed bone ratio values (p<0.05). There was more new bone formation at the third month on both the CT and histomorphometric examinations. A better adaptation of the bone tissues to the resorbable mini-plate and screws was observed on SEM at three months. CONCLUSION: The resorbable mini-plates provided a fixation stable enough to allow immediate oral alimentation and callus formation in both groups.
Asunto(s)
Animales , Femenino , Conejos , Cicatrización de Heridas/fisiología , Fijadores Internos , Implantes Absorbibles , Osteotomía Mandibular/rehabilitación , Osteogénesis/fisiología , Periodo Posoperatorio , Huesos/patología , Huesos/ultraestructura , Microscopía Electrónica de Rastreo/métodos , Tomografía Computarizada por Rayos X/métodos , Remodelación Ósea/fisiología , Modelos Animales , Osteotomía Mandibular/instrumentaciónRESUMEN
PURPOSE:To compare bone healing in mandibular vertical body osteotomies (MVBO) after fixation with a resorbable 2.0mm-profile fixation system in the first and third postoperative months in rabbits.METHODS:Twenty hemimandibles of ten rabbits were divided into two groups according to duration of resorbable fixation-one or three months. The MVBOs were performed and one four-hole, resorbable, 2.0mm mini-plate fixation system was used on each side. The computed tomography (CT) scans, scanning electron microscopy (SEM), and histomorphometric outcomes of groups I and II were compared.RESULTS:Significant differences were found between the one- and three- month assessments in terms of newly formed bone ratio values (p<0.05). There was more new bone formation at the third month on both the CT and histomorphometric examinations. A better adaptation of the bone tissues to the resorbable mini-plate and screws was observed on SEM at three months.CONCLUSION:The resorbable mini-plates provided a fixation stable enough to allow immediate oral alimentation and callus formation in both groups.(AU)