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Bone allografts are commonly used for bone regeneration. The aim of this study was evaluate the efficacy of a freeze dried bone matrix (FDBM) in critical size defect (CZD) rat calvaria. Eighteen Wistar female rats (body weight 150 ± 50 g) with CZD (5mm) were divided in two groups: group 1, using freeze dried bone matrix; and group 2, only with coagulum. All samples were evaluated on the 1st, 3rd and 6th weeks post-surgery by soft X-ray, histological and histometric studies. Soft X-ray results showed a radiolucent image with many irregular radiopaque areas. Histologically, bone regeneration was initiated from the 3rd week, when a thin layer of new woven bone could be seen adjacent to the matrix. At the 6th week, lamellar bone covered over half (61.8 %) of the defect area. The lack of FDBM resorption allowed its incorporation to the new regenerated bone. This behavior is important in circumstances where it is necessary not only to stimulate bone regeneration but also increase the volume in affected areas, such as during the placement of dental implants. The results obtained in this research are encouraging for the use of freeze dried bone matrix as a bone graft material.Fil: Jammal, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET- Tucumán. Planta Piloto de Procesos Industriales Microbiológicos (i); Argentina; Universidad Nacional de Tucumán. Facultad de Odontología; Argentina;Fil: Missana, Liliana Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET- Tucumán. Planta Piloto de Procesos Industriales Microbiológicos (i); Argentina; Universidad Nacional de Tucumán. Facultad de Odontología; Argentina;Fil: Takabatake, Kiyofumi. Okayama University. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Japón;Fil: Takagi, Shin. Okayama University. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Japón;Fil: Nagatsuka, Hitoshi. Okayama University. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Japón

Freeze Dried Bone Matrix on Rat Critical Size Defect Regeneration