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Artifacts from dental implants in magnetic resonance imaging in the head and neck region
566 Free Papers—Poster Presentations of this method were as follows: 1) sufficient number of cells for observation can be obtained; 2) the quality is not reduced by drying or smearing procedures; 3) although the oral mucosa bleeds easily, such bleeding does not result in unclear regions; 4) observation is possible even in cases in which a cancerous background, such as necrotic tissue or cancer-related findings (such as Candida infection), is not resolved completely; 5) deep-layer squamous cells can be collected relatively easily even in tumours presenting exophytic type; and 6) this method causes less cellular overlap and is useful for morphological analyses, immunohistochemical staining and molecular biological analyses. Conclusion: The observations discussed above indicate that liquid-based cytology is a highly useful system.
year. Histological examination showed a feature of chronic osteomyelitis. The bone lesion was gradually expanded by 2004. Therefore, we tried combination therapy with hyperbaric oxygen and pamidronate. The patient received hyperbaric oxygen for 1 hour and intravenous infusion of pamidronate (45 mg) simultaneously. No side effect was observed. Three days after the therapy, pain was completely resolved. There have been no symptoms for 3 years and accumulation in 99m-Tc scintigraphy was reduced. Conclusion: Combination therapy with hyperbaric oxygen and pamidronate is very useful for mandibular DSO, supporting former evidence.
doi:10.1016/j.ijom.2009.03.591
P120 Artifacts from dental implants in magnetic resonance imaging in the head and neck region
P119 Diffuse sclerosing osteomyelitis of the mandible treated with hyperbaric oxygen and pamidronate: a long-term follow-up M. Urade ∗ , K. Noguchi, K. Moridera, S. Hashitani, H. Kishimoto Department of Oral and Maxillofacial Surgery, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
Introduction: Diffuse sclerosing osteomyelitis (DSO) of the mandible is a chronic inflammatory disease of bone refractory to conventional treatments including antibiotics, curettage and decortication, and shows a prolonged clinical course resulting in a resection of the mandible. In recent years, several reports suggested that bisphosphonates are useful for mandibular DSO. We present a case of DSO of the mandible with clinical course of 15 years successfully treated with hyperbaric oxygen and pamidronate, an amino-bisphosphonate. Case Report: A 61-year-old woman was referred to our clinic with a chief complaint of continuous pain and swelling of the right side of the mandible in 1993. On clinical examination, the patient had spontaneous pain and diffuse swelling. Orthopantomography showed an area of diffuse sclerosis with occasional osteolysis in the right side of the mandible. The clinical diagnosis was DSO. The patient received the administration of antibiotics and analgesics and curettage repeatedly. Although the symptoms were transiently relieved, they recurred twice or 3 times a
doi:10.1016/j.ijom.2009.03.592
M. Kumagai 1,∗ , S. Osada 2 , K. Hanzawa 2 1 Department of Oral and Maxillofacial Surgery, Tohoku Kosai Hospital, Sendai, Japan 2 Department of Radiology, Tohoku Kosai Hospital, Sendai, Japan
Background and Objectives: Although in previous studies, artifacts on magnetic resonance imaging (MRI) caused by dental implants were reported to be minor, in those studies, only T1-weighted and T2-weighted images were used. Other sequences used in the head and neck region, for example, fat suppressed T2weighted images (T2-SPIR), useful for studying musculoskeletal infection, and diffusion weighted image (DWI), used to diagnose acute cerebral ischemia, have not been investigated. To recognise the nature of artifacts in those sequences, the following experimental images were examined. Methods: Soft splints to hold implants (Astra-Tech® 5.0 ST 11 mm) were prepared for a volunteer. Keeping implants inside the oral cavity, MRI with the following sequences were taken: (maxillofacial region) T1-weighted, T2-weighted and T2-SPIR images (brain) T1-weighted, T2weighted, T2* images, DWI and magnetic resonance angiography. Results: In the maxillofacial region, in line with previous reports, the artifacts in T1-weighted and T2-weighted images were in a limited area. In T2-SPIR images, the artifacts were wider than those in T1-weighted and T2-weighted images, but were still limited around the implant. In the
brain region, in all sequences we checked in this study, artifacts were not recognised. Conclusion: The nature of artifacts from implants in MRI differed depending on the image sequences. In the sequences we checked in this study, the artifacts were seen only in a limited area. doi:10.1016/j.ijom.2009.03.593
P121 Spontaneous bone regeneration after enucleation of jaw cyst: a radiographic analysis J.H. Yim ∗ , J.H. Lee Department of Oral and Maxillofacial Surgery, Dankook Dental Hospital, Sinbu-dong, Dongnam-gu, Cheonan-si, Chungnam, Korea
Background and Objectives: A bone graft procedure is widely used as a treatment method for fast recovery of defected area after enucleation of cysts. Although autograft, allograft, xenograft and alloplastic material are used as grafts when performing bone graft procedures, each of them has advantages as well as disadvantages. However, some recent literatures report that it is possible to recover defected areas caused by enucleation of relatively large jaw cysts, without using bone grafts. A retrograde research was carried out on patients who had enucleation of jaw cysts without having bone graft procedures. The aim of the study was to find out whether spontaneous recovery of defected area with time occurred and what the contributing factors were. Methods: In total, 194 patients were considered as patients. 180 of them had been diagnosed as having cystic lesion and had enucleation of cysts without having bone grafts, while 14 of them had been diagnosed as having unicystic ameloblastoma and had the same enucleation procedures without having bone grafts. Out of these 194 patients, 74 patients who had no wound dehiscence and who were available for follow-up studies were selected. They were classified into two groups according to the size of radiolucent area in the preoperative panoramic radiographs: in one group, it was larger than 3 × 4 cm, while in the other group, it was smaller than 3 × 4 cm. Follow-up panoramic radiographs were taken immediately after the surgery, then after 3, 6, 9 and 12 months. On those radiographs, changes in size and density of the defected areas were observed using the Gray-level histogram of Adobe Photoshop v7.0. Correlation between bone regeneration and factors such as the type and size
year. Histological examination showed a feature of chronic osteomyelitis. The bone lesion was gradually expanded by 2004. Therefore, we tried combination therapy with hyperbaric oxygen and pamidronate. The patient received hyperbaric oxygen for 1 hour and intravenous infusion of pamidronate (45 mg) simultaneously. No side effect was observed. Three days after the therapy, pain was completely resolved. There have been no symptoms for 3 years and accumulation in 99m-Tc scintigraphy was reduced. Conclusion: Combination therapy with hyperbaric oxygen and pamidronate is very useful for mandibular DSO, supporting former evidence.
doi:10.1016/j.ijom.2009.03.591
P120 Artifacts from dental implants in magnetic resonance imaging in the head and neck region
P119 Diffuse sclerosing osteomyelitis of the mandible treated with hyperbaric oxygen and pamidronate: a long-term follow-up M. Urade ∗ , K. Noguchi, K. Moridera, S. Hashitani, H. Kishimoto Department of Oral and Maxillofacial Surgery, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
Introduction: Diffuse sclerosing osteomyelitis (DSO) of the mandible is a chronic inflammatory disease of bone refractory to conventional treatments including antibiotics, curettage and decortication, and shows a prolonged clinical course resulting in a resection of the mandible. In recent years, several reports suggested that bisphosphonates are useful for mandibular DSO. We present a case of DSO of the mandible with clinical course of 15 years successfully treated with hyperbaric oxygen and pamidronate, an amino-bisphosphonate. Case Report: A 61-year-old woman was referred to our clinic with a chief complaint of continuous pain and swelling of the right side of the mandible in 1993. On clinical examination, the patient had spontaneous pain and diffuse swelling. Orthopantomography showed an area of diffuse sclerosis with occasional osteolysis in the right side of the mandible. The clinical diagnosis was DSO. The patient received the administration of antibiotics and analgesics and curettage repeatedly. Although the symptoms were transiently relieved, they recurred twice or 3 times a
doi:10.1016/j.ijom.2009.03.592
M. Kumagai 1,∗ , S. Osada 2 , K. Hanzawa 2 1 Department of Oral and Maxillofacial Surgery, Tohoku Kosai Hospital, Sendai, Japan 2 Department of Radiology, Tohoku Kosai Hospital, Sendai, Japan
Background and Objectives: Although in previous studies, artifacts on magnetic resonance imaging (MRI) caused by dental implants were reported to be minor, in those studies, only T1-weighted and T2-weighted images were used. Other sequences used in the head and neck region, for example, fat suppressed T2weighted images (T2-SPIR), useful for studying musculoskeletal infection, and diffusion weighted image (DWI), used to diagnose acute cerebral ischemia, have not been investigated. To recognise the nature of artifacts in those sequences, the following experimental images were examined. Methods: Soft splints to hold implants (Astra-Tech® 5.0 ST 11 mm) were prepared for a volunteer. Keeping implants inside the oral cavity, MRI with the following sequences were taken: (maxillofacial region) T1-weighted, T2-weighted and T2-SPIR images (brain) T1-weighted, T2weighted, T2* images, DWI and magnetic resonance angiography. Results: In the maxillofacial region, in line with previous reports, the artifacts in T1-weighted and T2-weighted images were in a limited area. In T2-SPIR images, the artifacts were wider than those in T1-weighted and T2-weighted images, but were still limited around the implant. In the
brain region, in all sequences we checked in this study, artifacts were not recognised. Conclusion: The nature of artifacts from implants in MRI differed depending on the image sequences. In the sequences we checked in this study, the artifacts were seen only in a limited area. doi:10.1016/j.ijom.2009.03.593
P121 Spontaneous bone regeneration after enucleation of jaw cyst: a radiographic analysis J.H. Yim ∗ , J.H. Lee Department of Oral and Maxillofacial Surgery, Dankook Dental Hospital, Sinbu-dong, Dongnam-gu, Cheonan-si, Chungnam, Korea
Background and Objectives: A bone graft procedure is widely used as a treatment method for fast recovery of defected area after enucleation of cysts. Although autograft, allograft, xenograft and alloplastic material are used as grafts when performing bone graft procedures, each of them has advantages as well as disadvantages. However, some recent literatures report that it is possible to recover defected areas caused by enucleation of relatively large jaw cysts, without using bone grafts. A retrograde research was carried out on patients who had enucleation of jaw cysts without having bone graft procedures. The aim of the study was to find out whether spontaneous recovery of defected area with time occurred and what the contributing factors were. Methods: In total, 194 patients were considered as patients. 180 of them had been diagnosed as having cystic lesion and had enucleation of cysts without having bone grafts, while 14 of them had been diagnosed as having unicystic ameloblastoma and had the same enucleation procedures without having bone grafts. Out of these 194 patients, 74 patients who had no wound dehiscence and who were available for follow-up studies were selected. They were classified into two groups according to the size of radiolucent area in the preoperative panoramic radiographs: in one group, it was larger than 3 × 4 cm, while in the other group, it was smaller than 3 × 4 cm. Follow-up panoramic radiographs were taken immediately after the surgery, then after 3, 6, 9 and 12 months. On those radiographs, changes in size and density of the defected areas were observed using the Gray-level histogram of Adobe Photoshop v7.0. Correlation between bone regeneration and factors such as the type and size