The efficacy of hydrothermally obtained carbonated hydroxyapatite in healing alveolar bone defects in rats with or without corticosteroid treatment

Background/Aim. Autogenous bone grafting has been the gold standard in clinical cases when bone grafts are required for bone defects in dentistry. The study was undertaken to evaluate multilevel designed carbonated hydroxyapatite (CHA) obtained by hydrothermal method, as a bone substitute in healing bone defects with or without corticosteroid treatment in rats as assessed by histopathologic methods. Methods. Bone defects were created in the alveolar bone by teeth extraction in 12 rats. The animals were initially divided into two groups. The experimental group was pretreated with corticosteroids: methylprednisolone and dexamethasone, intramuscularly, while the control group was without therapy. Posterior teeth extraction had been performed after the corticosteroid therapy. The extraction defects were fulfilled with hydroxyapatite with bimodal particle sizes in the range of 50-250 mu m and the sample from postextocactional defect of the alveolar bone was analyzed pathohystologically. Results. The histopatological investigations confirmed the biologic properties of the applied material. The evident growth of new bone in the alveolar ridge was clearly noticed in both groups of rats. Carbonated HA obtained by hydrothermal method promoted bone formation in the preformed defects, confirming its efficacy for usage in bone defects. Complete resorption of the materials particles took place after 25 weeks. Conclusion. Hydroxyapatite completely meets the clinical requirements for a bone substitute material. Due to its microstructure, complete resorption took place during the observation period of the study. Corticosteroid treatment did not significantly affect new bone formation in the region of postextractional defects

Avascular Necrosis of Stapes Crura in One Case of Operated Otosclerosis

Unilateral otosclerosis combined with avascular necrosis of stapes crura is a rare entity. It should be considered in a case of high grade otosclerosis. Symptoms are the same as in patients who suffer from common otosclerosis. Patients complain on progressive hearing loss and tinnitus. The diagnosis is made clinically by conventional audiologic evaluation and radiologically by x-ray mastoid Schuller’s view and CT scan. HRCT scan makes visible all parts of ossicular chain and gives surgeon some information about ossicular chain damage. Surgery with stapedotomy and stapes prosthesis implantation in a case of otosclerosis with avascular necrosis of stapes crura can be success therapy to improve patient’s hearing

The efficacy of hydrothermally obtained carbonated hydroxyapatite in healing alveolar bone defects in rats with or without corticosteroid treatment

Background/Aim. Autogenous bone grafting has been the gold standard in clinical cases when bone grafts are required for bone defects in dentistry. The study was undertaken to evaluate multilevel designed carbonated hydroxyapatite (CHA) obtained by hydrothermal method, as a bone substitute in healing bone defects with or without corticosteroid treatment in rats as assessed by histopathologic methods. Methods. Bone defects were created in the alveolar bone by teeth extraction in 12 rats. The animals were initially divided into two groups. The experimental group was pretreated with corticosteroids: methylprednisolone and dexamethasone, intramuscularly, while the control group was without therapy. Posterior teeth extraction had been performed after the corticosteroid therapy. The extraction defects were fulfilled with hydroxyapatite with bimodal particle sizes in the range of 50-250 mu m and the sample from postextocactional defect of the alveolar bone was analyzed pathohystologically. Results. The histopatological investigations confirmed the biologic properties of the applied material. The evident growth of new bone in the alveolar ridge was clearly noticed in both groups of rats. Carbonated HA obtained by hydrothermal method promoted bone formation in the preformed defects, confirming its efficacy for usage in bone defects. Complete resorption of the materials particles took place after 25 weeks. Conclusion. Hydroxyapatite completely meets the clinical requirements for a bone substitute material. Due to its microstructure, complete resorption took place during the observation period of the study. Corticosteroid treatment did not significantly affect new bone formation in the region of postextractional defects

Anatomical and functional study of the musculus psoas major and nervus femoralis in correlation with pelvic diameters

Background/Aim. The iliopsoas muscle [musculus (m.) iliopsoas] originates from the Greek word psóa, which means loin and represents the only muscle in the body with anatomical preconditions to simultaneously and directly contribute to the stability and movement of the trunk, pelvis, and legs. M. iliopsoas belongs to the inner thigh muscle group and forms part of the posterior abdominal wall. This muscle is the major flexor of the hip joint, and it is functionally essential for proper posture, walking, running, and other physical activities. The aim of this study was to determine the relationship between the anatomical parameters of the pelvis and nervus (n.) femoralis, as well as the relationship between the same pelvic parameters and m. psoas major. Methods. The study was conducted at the Faculty of Medicine, University of Belgrade, on cadaveric material of the Institute of Anatomy “Niko Miljanić”. For measurement purposes, 14 cadavers were used, seven of which were male and seven female, aged 67–79 years. The measuring instruments used in this study were a ruler and an electronic digital caliper (measuring range 0–500 mm, resolution 0.01 mm). Statistical data processing was performed in the SPSS 11.0 program using the Mann-Whitney U test. Results. The results of this study indicate a significant statistical difference in pelvic width between male and female cadavers, which was observed in the reduction of the bituberal line in females, while the parameters of the bispinal line showed no significant difference between the two genders. The decrease of the bituberal line in females was followed by an increase in the width of the proximal origin with a statistically significant decrease in the length of the proximal origin of the m. psoas major. Furthermore, the vertical distance of n. femoralis from the exit point of the muscle to the bispinal line was significantly reduced in the male cadavers. Conclusion. Based on our results, we can assume that, in most cases, due to the smaller bituberal and bispinal line or narrower pelvis, a shorter proximal attachment of the m. psoas major will occur with greater width (L2–L5 level) in the female than in the male gender, resulting in a longer vertical distance of n. femoralis. Such results indicate a close correlation between the anatomical parameters of the m. psoas major, which may affect the distance of n. femoralis exit from the muscle

Anatomical and functional study of the musculus psoas major and nervus femoralis in correlation with pelvic diameters

Background/Aim. The iliopsoas muscle [musculus (m.) iliopsoas] originates from the Greek word psóa, which means loin and represents the only muscle in the body with anatomical preconditions to simultaneously and directly contribute to the stability and movement of the trunk, pelvis, and legs. M. iliopsoas belongs to the inner thigh muscle group and forms part of the posterior abdominal wall. This muscle is the major flexor of the hip joint, and it is functionally essential for proper posture, walking, running, and other physical activities. The aim of this study was to determine the relationship between the anatomical parameters of the pelvis and nervus (n.) femoralis, as well as the relationship between the same pelvic parameters and m. psoas major. Methods. The study was conducted at the Faculty of Medicine, University of Belgrade, on cadaveric material of the Institute of Anatomy “Niko Miljanić”. For measurement purposes, 14 cadavers were used, seven of which were male and seven female, aged 67–79 years. The measuring instruments used in this study were a ruler and an electronic digital caliper (measuring range 0–500 mm, resolution 0.01 mm). Statistical data processing was performed in the SPSS 11.0 program using the Mann-Whitney U test. Results. The results of this study indicate a significant statistical difference in pelvic width between male and female cadavers, which was observed in the reduction of the bituberal line in females, while the parameters of the bispinal line showed no significant difference between the two genders. The decrease of the bituberal line in females was followed by an increase in the width of the proximal origin with a statistically significant decrease in the length of the proximal origin of the m. psoas major. Furthermore, the vertical distance of n. femoralis from the exit point of the muscle to the bispinal line was significantly reduced in the male cadavers. Conclusion. Based on our results, we can assume that, in most cases, due to the smaller bituberal and bispinal line or narrower pelvis, a shorter proximal attachment of the m. psoas major will occur with greater width (L2–L5 level) in the female than in the male gender, resulting in a longer vertical distance of n. femoralis. Such results indicate a close correlation between the anatomical parameters of the m. psoas major, which may affect the distance of n. femoralis exit from the muscle.Publisher PDFPeer reviewe