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The change in inclination of impacted mandibular third molars
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P26 - Poster session: Monday, April 26, 1999
Conclusion These findings indicate that reduction of TM expression, increased microvessel density, and MMP-7 positive expression seem to be related with a poor outcome for the patients of oral squamous cell carcinoma.
Material and methods 41 patients in whom a routine orthopantomography was undertaken, a radiopaque cyst-like lesion was detected in the floor of the maxillary antrum. The same patients underwent occipitomental view of the skull.
6. The Change in Inclination of Impacted Mandibular Third Molars
Results Of those, cysts were diagnosed in only 17 cases. In 10 cases they appeared radiographically as sinusitis and in 14 cases it was not possible to detect any pathology.
Venta, L, Turtola, L., Ylipaavalniemi, P. University of Helsinki and Finnish Student Health Service, Helsinki, Finland The aim of this longitudinal study was to follow-up the change of inclination in mandibular third molars from age 20 to 32 years. The subjects were drawn from a follow-up study of oral health in university students carried out at the Finnish Student Health Service in Helsinki, Finland. Number of impacted mandibular third molars followed up was 21 (10 male, 11 female) in 14 subjects. Panoramic radiographs were taken and clinical examination was carried out at mean age of 20.7 years (10.5 years) and 32.6 years (10.6 years). The inclination of the third molar was measured as the angle between the occlusal surface of the third molar and the occlusal plane (determined by the occlusal surfaces of the first and the second molars). A questionnaire was used at the end of the study to inquire about symptoms of patients during the follow-up. Statistics included the chisquared test and the t-test. The results showed that a change of more than 5 degrees in inclination had taken place for 76% of the mandibular third molars. The mean change of inclination was 19 degrees (_+11.5 degrees). The teeth changed their inclination both in the distal and in the mesial direction. All teeth that moved were initially inclined in a mesial direction. According to the questionnaire~ 67% of the subjects had been asymptomatic during the follow-up study. It is concluded that considerable changes in inclination of impacted mandibular third molars occurs after the normal age of eruption.
7. Orthopantomography Versus Occipitomental View for the Detection of Cysts of the Floor of the Maxillary Antrum
Conclusion It is concluded that orthopantomography should be recommended for the detection of cysts of the floor of the maxillary antrum as a method of choice.
8. Neovascularized Bone Flap in Rats: Experimental Study on Osteogenesis and Chondrogenesis
Matsui, R., Tabata, M., Sugihara, If. First Department of Oral and Maxillofacial Surgery, Kagoshima University Dental School, Kagoshima, Japan
Purpose This study evaluates the possibility of usefulness of neovascularized bone flap for treatment of unfavorable conditions, such as mandible or other facial bone defects for cancer, trauma, infection. Materials and methods Lewis rats, weighing an average of 400 gm, were anesthetized with intraperitoneal injections of sodium pentobarbital. The femoral artery and vein were dissected and elevated with muscle, and the distal end of the vascular bundle was ligated by 5-0 silk. The graft of iliac crest was harvested and then morselized with a bone cutter into 3 • mm chips. The bone chips were then gently packed into the circular piece of atelocollagen (MEIPAC | Meiji Co, Tokyo) circumferendally around the vesses and sutured by 5-0 silk. The rats were divided into three groups in accordance with autologous iliac bone (Group 1), allogenic freeze-dried bone (-100~ 72 hr; Group 2), allogenic boiled bone (100~ hr; Group 3). All flaps were reharvested at 2, 4, 8, and 12 weeks for histological, radiographic, and histochemical observation.
Rakocevic, Z., Stajcic, Z. Faculty of Stomatology, University of Belgrade, Yugoslavia Occipitomental view is known to be a reliable method for the detection of lesions in the maxillary antrum. It is even recommended as a method of choice in most textbooks of dento-maxillofacial radiology. Aim
The aim of this paper was to compare its value with orthopantomography for the detection of the cysts of the floor of the maxillary antrum.
Results All wounds healed uneventfully without evidence of infection or graft dislodgement. Group 1: At 4 weeks after transplantation, endochondral ossification was observed around the transplanted bone. At 12 weeks, new bone formation was evident around the vascular pedMe, and well-developed bone marrow was observed. Group 2: At 4 weeks, chondrocytes appeared on the transplanted bone and newly formed vessels were proliferated. At 8 weeks, chondrogenesis was markedly observed. Group 3: Osteogenesis and chondrogenesis were not observed. Chondrogenesis started at 4 weeks in Group 2 and overex-
P26 - Poster session: Monday, April 26, 1999
Conclusion These findings indicate that reduction of TM expression, increased microvessel density, and MMP-7 positive expression seem to be related with a poor outcome for the patients of oral squamous cell carcinoma.
Material and methods 41 patients in whom a routine orthopantomography was undertaken, a radiopaque cyst-like lesion was detected in the floor of the maxillary antrum. The same patients underwent occipitomental view of the skull.
6. The Change in Inclination of Impacted Mandibular Third Molars
Results Of those, cysts were diagnosed in only 17 cases. In 10 cases they appeared radiographically as sinusitis and in 14 cases it was not possible to detect any pathology.
Venta, L, Turtola, L., Ylipaavalniemi, P. University of Helsinki and Finnish Student Health Service, Helsinki, Finland The aim of this longitudinal study was to follow-up the change of inclination in mandibular third molars from age 20 to 32 years. The subjects were drawn from a follow-up study of oral health in university students carried out at the Finnish Student Health Service in Helsinki, Finland. Number of impacted mandibular third molars followed up was 21 (10 male, 11 female) in 14 subjects. Panoramic radiographs were taken and clinical examination was carried out at mean age of 20.7 years (10.5 years) and 32.6 years (10.6 years). The inclination of the third molar was measured as the angle between the occlusal surface of the third molar and the occlusal plane (determined by the occlusal surfaces of the first and the second molars). A questionnaire was used at the end of the study to inquire about symptoms of patients during the follow-up. Statistics included the chisquared test and the t-test. The results showed that a change of more than 5 degrees in inclination had taken place for 76% of the mandibular third molars. The mean change of inclination was 19 degrees (_+11.5 degrees). The teeth changed their inclination both in the distal and in the mesial direction. All teeth that moved were initially inclined in a mesial direction. According to the questionnaire~ 67% of the subjects had been asymptomatic during the follow-up study. It is concluded that considerable changes in inclination of impacted mandibular third molars occurs after the normal age of eruption.
7. Orthopantomography Versus Occipitomental View for the Detection of Cysts of the Floor of the Maxillary Antrum
Conclusion It is concluded that orthopantomography should be recommended for the detection of cysts of the floor of the maxillary antrum as a method of choice.
8. Neovascularized Bone Flap in Rats: Experimental Study on Osteogenesis and Chondrogenesis
Matsui, R., Tabata, M., Sugihara, If. First Department of Oral and Maxillofacial Surgery, Kagoshima University Dental School, Kagoshima, Japan
Purpose This study evaluates the possibility of usefulness of neovascularized bone flap for treatment of unfavorable conditions, such as mandible or other facial bone defects for cancer, trauma, infection. Materials and methods Lewis rats, weighing an average of 400 gm, were anesthetized with intraperitoneal injections of sodium pentobarbital. The femoral artery and vein were dissected and elevated with muscle, and the distal end of the vascular bundle was ligated by 5-0 silk. The graft of iliac crest was harvested and then morselized with a bone cutter into 3 • mm chips. The bone chips were then gently packed into the circular piece of atelocollagen (MEIPAC | Meiji Co, Tokyo) circumferendally around the vesses and sutured by 5-0 silk. The rats were divided into three groups in accordance with autologous iliac bone (Group 1), allogenic freeze-dried bone (-100~ 72 hr; Group 2), allogenic boiled bone (100~ hr; Group 3). All flaps were reharvested at 2, 4, 8, and 12 weeks for histological, radiographic, and histochemical observation.
Rakocevic, Z., Stajcic, Z. Faculty of Stomatology, University of Belgrade, Yugoslavia Occipitomental view is known to be a reliable method for the detection of lesions in the maxillary antrum. It is even recommended as a method of choice in most textbooks of dento-maxillofacial radiology. Aim
The aim of this paper was to compare its value with orthopantomography for the detection of the cysts of the floor of the maxillary antrum.
Results All wounds healed uneventfully without evidence of infection or graft dislodgement. Group 1: At 4 weeks after transplantation, endochondral ossification was observed around the transplanted bone. At 12 weeks, new bone formation was evident around the vascular pedMe, and well-developed bone marrow was observed. Group 2: At 4 weeks, chondrocytes appeared on the transplanted bone and newly formed vessels were proliferated. At 8 weeks, chondrogenesis was markedly observed. Group 3: Osteogenesis and chondrogenesis were not observed. Chondrogenesis started at 4 weeks in Group 2 and overex-