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Öğe The effects of osteoformin on mineralisation and quality of newly formed bone during mandibular distraction osteogenesis in rabbits(MOSBY-ELSEVIER, 2009) Pampu, A. Alper; Ozkaynak, Ozkan; Senel, Figen Cizmeci; Cankaya, Mustafa; Dolanmaz, Dogan; Ersoz, Safak; Avunduk, Mustafa CihatObjective. The aim of this experimental study was to evaluate the effects of osteoformin on mineralization and quality of newly formed bone during distraction osteogenesis in rabbits. Study design. Distraction rate was as 1 mm/day for 5 days. In the experimental group, 100 mu g/kg osteoformin in 100 mu L/kg phosphate-buffered saline (PBS) was injected into the distraction area at day 1 and day 7 after surgery. In the control group, only 100 mu L/kg PBS was injected on the same days. On day 42, the animals were killed. Results. Bone mineral density and bone mineral content values increased significantly in the experimental group (P < .05). Newly formed bone areas, number of vessels and osteoblasts were significantly greater in experimental group (P < .05). The number of fibroblasts were also greater, but it was not significant statistically (P < .05). The number of osteoclasts was significantly lower in experimental group (P < .05). Conclusion. The results of this study show that osteoformin improves healing of regenerate in distraction osteogenesis in rabbits. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 108: 833-837)Öğe Experimental Evaluation of the Effects of Zoledronic Acid on Regenerate Bone Formation and Osteoporosis in Mandibular Distraction Osteogenesis(W B Saunders Co-elsevier Inc, 2006) Pampu, A. Alper; Dolanmaz, Doğan; Tüz, Hakan H.; Karabacakoğlu, AydınPurpose: The aim of this study was to evaluate the effects of systemically administered zoledronic acid (ZA) on the bone mineral density (BMD) and bone mineral content (BMC) at mandibular distraction sites in rabbits. Materials and Methods: Eighteen New Zealand white rabbits were randomly divided into 2 groups. Bone lengthening was performed in the left portion of the mandible through distraction osteogenesis at a rate of 0.5 mm every 12 hours for 5 days. While the experimental group rabbits were administered intravenous 0.1 mg/kg ZA, control group rabbits were given only saline infusion during operation. All animals were sacrificed at the end of the consolidation period of 28 days. The mandibles of all animals were removed and both the anterior and posterior pin regions of the regenerate and regenerate region were evaluated by dual energy x-ray absorptiometry (DEXA). BMD and BMC data were statistically analyzed. Results: Except for 1 rabbit from the experimental group that had an infection at the external pin region, all animals showed complete clinical healing. When the values in the group receiving ZA were compared with those of the control group, it was observed that the BMD values of the anterior pin region of regenerate, regenerate region, and posterior pin region increased by 23%, 20%, and 31%, respectively; and BMC values increased by 22%, 24%, and 32%, respectively. When data of these regions were compared, both BMD and BMC were found statistically different in all regions (P <.05). Conclusion: Results of this study showed that ZA had positive effects on new bone formation at and around the distraction gaps of the lengthened rabbit mandibles by distraction osteogenesis.Öğe Histomorphometric evaluation of delayed changes in masseter muscle after lengthening the rabbit mandible by distraction osteogenesis(WILEY, 2009) Tuez, H. H.; Dolanmaz, D.; Pampu, A. Alper; Kisnisci, R. S.; Guenhan, OeThe aim of the study was to evaluate the delayed responses and changes of gradually lengthened masseter muscles of rabbit mandibles. Unilateral lengthening of rabbit mandibles was performed in 18 New Zealand rabbits for 7 days at the rate of 1 mm day(-1). Mandibles of animals were removed at months 3, 4, and 6 after distraction. Biopsy samples of distracted and contralateral side masseter muscles were histopathologically evaluated and mean area of muscle fibers (MAF) was evaluated with histomorphometric methods. Results were statistically analyzed. Mild to moderate atrophy of the fibers, and necrosis and myophagocytosis in some areas were the leading features at month 3 and which were decreased at month 4 in distracted side-muscle specimens, with no statistically significant differences when compared with non-distracted side muscles at the same periods. Almost completely, normal fibers were detected in distracted muscle specimens at month 6. Evidence of myopathic changes was found to disappear at month 6 and no significant difference was found in the MAF of distracted side muscles. This study showed that the masseter muscle could adapt to gradual lengthening of the mandible within 6 months. Regenerative features and some degree of atrophic changes that could be observed at months 3 and 4 disappeared at month 6, with adaptation of the fibers.Öğe Histomorphometric evaluation of the effects of zoledronic acid on mandibular distraction osteogenesis in rabbits(W B SAUNDERS CO-ELSEVIER INC, 2008) Pampu, A. Alper; Dolanmaz, Dogan; Tuez, Hakan H.; Avunduk, M. Cihat; Kisnisci, Reha S.Purpose: To assess the effect of systemic administration of zoledronic acid (ZA) on mineralization of newly formed bone and to determine strain-related osteoporosis on surrounding bone during lengthening of immature rabbit mandible. Materials and Methods: Eighteen New Zealand white rabbits were divided randomly into 2 groups, and bone lengthening was carried out in the left portion of the mandible through distraction osteogenesis with a rate of 0.5 mm every 12 hours for 5 days. The experimental group was administered 0.1 mg/kg ZA intravenously. The control group was given saline infusion only during operation. All animals were sacrificed at the end of the 28-day consolidation period. The mandibles of all animals were removed and regenerate was evaluated. Osteoblasts, osteoclasts, collagen fibers, and fibroblasts were marked within 0.1-mm(2) area and newly formed bone area was measured within 0.5-mm(2) area. All data were analyzed using Mann-VAiitney U test. Results: Although irregular bone destruction spots were seen in the control group, the experimental group showed regular ossification areas and significant difference between osteoblast and osteoclast numbers (P < .05). In the regenerate zone, there was considerable difference between the 2 groups in terms of osteoblast, osteoclast, and collagen amounts (P < .05). Additionally, newly formed bone areas and fibroblast count were higher in experimental group. Conclusions: The results of this study showed that ZA had positive effects on the new bone formation, which may potentially shorten the consolidation period. (c) 2008 American Association of Oral and Maxillofacial Surgeons.
