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Evaluation of morphology condylar in patients class ii undergoing orthognathic surgery using cone beam computed tomography
e110
Oral Presentation
The management of bony margins is controversial. The evidence will be presented and critically evaluated. Regional session: Europe. http://dx.doi.org/10.1016/j.ijom.2015.08.695 Evaluation of bone regeneration process between bone grafting and cortical bone repositioning G. Martinez-de la Cruz 1,∗ , K. Yamauchi 1 , S. Nogami 1 , B. Hirayama 1 , Y. Shimizu 2 , T. Takahashi 1
Dolphin Imaging® software for analysis 2D and 3D in the coronal and sagittal planes. This study showed no statistically significant changes in condylar volume and condylar area that were measured. However, four linear measurements showed significant alterations, three of them being associated with rotational condylar displacement in the fossa and one measure related to condylar height in right condyle suggesting condylar resorption. It was concluded that at least 9 months after surgery, condylar remodeling, physiological and adaptive, were observed as well as changing the morphology of the condyle and its spatial position in the articular fossa.
1 Division of Oral and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan 2 Division of Oral Pathology, Tohoku University Graduate School of Dentistry, Sendai, Japan
http://dx.doi.org/10.1016/j.ijom.2015.08.697
Background: Bone graft disadvantages are widely known. Dynamic methods as distraction osteogenesis have recently been suggested as novel option for bone augmentation, however it also has disadvantages such as longer treatment period and costs. Objectives: Evaluate the capabilities of bone formation by cortical bone repositioning (CBR) as a new method of static bone augmentation and compare with conventional bone graft. Materials and methods: Six Japanese white rabbits (12 sides) were divided into 3 groups according to time of sacrifice. A rectangular shaped cortical bone from the mandibular body was cut with a micro saw, half of the block was positioned as a bone graft above the original bone surface beside the defect and the other half remained only elevated above the defect, the block was fixed using two titanium screws, one on each side. Rabbits were sacrificed at 2, 5 and 8 weeks after operation, newly formed bone was evaluated radiographically, histologically, and histomorphometric analysis was performed. Results: At 2 weeks more granulation tissue was found in the bone graft side, by the 5 and 8 weeks similar amount of new bone was found in both sides, CBR side showed resorption and inclination towards the defect. Histomorphometric analysis revealed a 17% decrease of the block in the CBR side by the 5 week compared to a 9% in the bone graft side, by the 8 week it was 28% in the CBR compared to 18% in the bone graft. Conclusions: CBR has potential for bone augmentation, however further studies are required.
K. Matsunaga 1,2,∗ , N. Nakamura 2 , K. Matsumoto 2 , T. Kibe 2 , K. Kume 2 , S. Hamada 1
http://dx.doi.org/10.1016/j.ijom.2015.08.696 Evaluation of morphology condylar in patients class ii undergoing orthognathic surgery using cone beam computed tomography 1,∗
2
G.M. Mascarenhas de Souza , V.A. Castro , K.L.S. Marques 2 , W. Miranda 2 , A.I. Trindade Neto 1 , C.J. Prado 2 , D. Zanetta-Barbosa 2 1
Department of Oral and Maxillofacial Surgery, Santa Izabel Hospital, Salvador, BA, Brazil 2 Federal University of Uberlândia, Dental School, Postgraduate Program in Dentistry, Uberlândia, MG, Brazil Changes in condylar morphology after orthognathic surgery are more frequent in class II deformities associated with condylar hypoplasia and high mandibular plane angle. The aim of this study was to evaluate linear, angular, area and volumetric changes in condylar morphology after surgery. The computed tomography images of 23 Class II patients were exported to the
A case of reconstructed unilateral upper lip deformity due to progressive hemifacial atrophy with a cross-lip vermilion flap
1
Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Kinki University, Japan 2 Department of Oral and Maxillofacial Surgery, Field of Oral and Maxillofacial Rehabilitation, Kagoshima University, Graduate School of Medical and Dental Sciences, Japan
Background: Progressive hemifacial atrophy is a disease whereby the soft and hard tissues of the unilateral trigeminal nerve domain progressively degenerate. We encountered a patient with the unilateral lip atrophy due to progressive hemifacial atrophy, who had undergone reconstruction of the unilateral upper lip in our hospital. We report the progress and summary. Patient: The patient was a 22-year-old female. She had difficulty closing her mouth due to the unilateral lip atrophy. Methods: We performed reconstruction of the upper lip on the atrophic side with a cross-lip vermilion flap of the non-atrophic lower lip, and released the flap at 14 days postoperatively. Findings: The survival of the mucosal flap was favorable postoperatively. Slight drooping of the upper lip on the affected side gradually developed after the operation. Subsequently, we performed minor correction of the upper lip on the affected side at 5 months postoperatively. Atrophy and deformity of the upper lip on the affected side were not recognizable and the form of the lip and function of lip closure on the affected side were satisfactory at 2 years postoperatively. Conclusion: To correct the form and function in the presence of the upper lip atrophy, the use of a cross-lip vermilion flap of the non-atrophic lower lip could become a useful reconstructive method. http://dx.doi.org/10.1016/j.ijom.2015.08.698
Oral Presentation
The management of bony margins is controversial. The evidence will be presented and critically evaluated. Regional session: Europe. http://dx.doi.org/10.1016/j.ijom.2015.08.695 Evaluation of bone regeneration process between bone grafting and cortical bone repositioning G. Martinez-de la Cruz 1,∗ , K. Yamauchi 1 , S. Nogami 1 , B. Hirayama 1 , Y. Shimizu 2 , T. Takahashi 1
Dolphin Imaging® software for analysis 2D and 3D in the coronal and sagittal planes. This study showed no statistically significant changes in condylar volume and condylar area that were measured. However, four linear measurements showed significant alterations, three of them being associated with rotational condylar displacement in the fossa and one measure related to condylar height in right condyle suggesting condylar resorption. It was concluded that at least 9 months after surgery, condylar remodeling, physiological and adaptive, were observed as well as changing the morphology of the condyle and its spatial position in the articular fossa.
1 Division of Oral and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan 2 Division of Oral Pathology, Tohoku University Graduate School of Dentistry, Sendai, Japan
http://dx.doi.org/10.1016/j.ijom.2015.08.697
Background: Bone graft disadvantages are widely known. Dynamic methods as distraction osteogenesis have recently been suggested as novel option for bone augmentation, however it also has disadvantages such as longer treatment period and costs. Objectives: Evaluate the capabilities of bone formation by cortical bone repositioning (CBR) as a new method of static bone augmentation and compare with conventional bone graft. Materials and methods: Six Japanese white rabbits (12 sides) were divided into 3 groups according to time of sacrifice. A rectangular shaped cortical bone from the mandibular body was cut with a micro saw, half of the block was positioned as a bone graft above the original bone surface beside the defect and the other half remained only elevated above the defect, the block was fixed using two titanium screws, one on each side. Rabbits were sacrificed at 2, 5 and 8 weeks after operation, newly formed bone was evaluated radiographically, histologically, and histomorphometric analysis was performed. Results: At 2 weeks more granulation tissue was found in the bone graft side, by the 5 and 8 weeks similar amount of new bone was found in both sides, CBR side showed resorption and inclination towards the defect. Histomorphometric analysis revealed a 17% decrease of the block in the CBR side by the 5 week compared to a 9% in the bone graft side, by the 8 week it was 28% in the CBR compared to 18% in the bone graft. Conclusions: CBR has potential for bone augmentation, however further studies are required.
K. Matsunaga 1,2,∗ , N. Nakamura 2 , K. Matsumoto 2 , T. Kibe 2 , K. Kume 2 , S. Hamada 1
http://dx.doi.org/10.1016/j.ijom.2015.08.696 Evaluation of morphology condylar in patients class ii undergoing orthognathic surgery using cone beam computed tomography 1,∗
2
G.M. Mascarenhas de Souza , V.A. Castro , K.L.S. Marques 2 , W. Miranda 2 , A.I. Trindade Neto 1 , C.J. Prado 2 , D. Zanetta-Barbosa 2 1
Department of Oral and Maxillofacial Surgery, Santa Izabel Hospital, Salvador, BA, Brazil 2 Federal University of Uberlândia, Dental School, Postgraduate Program in Dentistry, Uberlândia, MG, Brazil Changes in condylar morphology after orthognathic surgery are more frequent in class II deformities associated with condylar hypoplasia and high mandibular plane angle. The aim of this study was to evaluate linear, angular, area and volumetric changes in condylar morphology after surgery. The computed tomography images of 23 Class II patients were exported to the
A case of reconstructed unilateral upper lip deformity due to progressive hemifacial atrophy with a cross-lip vermilion flap
1
Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Kinki University, Japan 2 Department of Oral and Maxillofacial Surgery, Field of Oral and Maxillofacial Rehabilitation, Kagoshima University, Graduate School of Medical and Dental Sciences, Japan
Background: Progressive hemifacial atrophy is a disease whereby the soft and hard tissues of the unilateral trigeminal nerve domain progressively degenerate. We encountered a patient with the unilateral lip atrophy due to progressive hemifacial atrophy, who had undergone reconstruction of the unilateral upper lip in our hospital. We report the progress and summary. Patient: The patient was a 22-year-old female. She had difficulty closing her mouth due to the unilateral lip atrophy. Methods: We performed reconstruction of the upper lip on the atrophic side with a cross-lip vermilion flap of the non-atrophic lower lip, and released the flap at 14 days postoperatively. Findings: The survival of the mucosal flap was favorable postoperatively. Slight drooping of the upper lip on the affected side gradually developed after the operation. Subsequently, we performed minor correction of the upper lip on the affected side at 5 months postoperatively. Atrophy and deformity of the upper lip on the affected side were not recognizable and the form of the lip and function of lip closure on the affected side were satisfactory at 2 years postoperatively. Conclusion: To correct the form and function in the presence of the upper lip atrophy, the use of a cross-lip vermilion flap of the non-atrophic lower lip could become a useful reconstructive method. http://dx.doi.org/10.1016/j.ijom.2015.08.698