Resumen de Periodontal Repair in Surgically Created Intrabony Defects in Dogs: Influence of the Number of Bone Walls on Healing Response
Chong-Kwan Kim, Chang-Sung Kim, Seong-Ho Choi, Jung-Kiu Chai, Kyoo-Sung Cho, Ik-Sang Moon, Ulf M.E. Wikesjö
Periodontal Repair in Surgically Created Intrabony Defects in Dogs: Influence of the Number of Bone Walls on Healing Response Chang-Sung Kim Department of Periodontology, Research Institute for Periodontal Regeneration, Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.
Seong-Ho Choi Department of Periodontology, Research Institute for Periodontal Regeneration, Oral Science Research Center, College of Dentistry, Brain Korea 21 Project for Medical Science, Seoul, Korea.
Jung-Kiu Chai Department of Periodontology, Research Institute for Periodontal Regeneration, Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.
Kyoo-Sung Cho Department of Periodontology, Research Institute for Periodontal Regeneration, Oral Science Research Center, College of Dentistry, Brain Korea 21 Project for Medical Science, Seoul, Korea.
Ik-Sang Moon Department of Periodontology, Research Institute for Periodontal Regeneration, Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.
Ulf M.E. Wikesjö Laboratory for Applied Periodontal and Craniofacial Regeneration, Department of Periodontology, Temple University, School of Dentistry, Philadelphia, PA.
Dr. Chong-Kwan Kim Department of Periodontology, Research Institute for Periodontal Regeneration, Oral Science Research Center, College of Dentistry, Brain Korea 21 Project for Medical Science, Seoul, Korea.
Background: The objective of this study was to histologically evaluate periodontal healing following flap surgery in intrabony periodontal defects to determine the influence of the number of bone walls on periodontal regeneration.
Methods: One-, 2-, and 3-wall intrabony periodontal defects were surgically produced at the proximal aspect of mandibular premolars in either right or left jaw quadrants in six beagle dogs. Mucoperiosteal flaps were positioned and sutured to their presurgery position following defect preparation. The animals were euthanized at 8 weeks post-surgery, and block sections of the defect sites were collected for histologic and histometric analysis.
Results: Bone and cementum regeneration was positively correlated to the number of bone walls limiting the intrabony periodontal defects. The junctional epithelium averaged (± SD) 1.5 ± 0.2, 1.2 ± 0.3, and 0.9 ± 0.2 mm for the 1-, 2-, and 3-wall defects, respectively, with the 3-wall defects being significantly different from the 1-wall defects (P <0.05). Cementum regeneration averaged 1.2 ± 0.6, 2.0 ± 0.6, and 2.8 ± 0.5 mm for the 1-, 2-, and 3-wall defects, respectively; all groups were significantly different from each other (P <0.05). Bone regeneration averaged 1.5 ± 0.5, 1.7 ± 0.6, and 2.3 ± 0.5 mm for the 1-, 2-, and 3-wall defects, respectively, with the 3-wall defects being significantly different from the 1-wall defects (P <0.05).
Conclusions: The results suggest that the number of bone walls is a critical factor determining treatment outcomes in intrabony periodontal defects. One- and 3-wall intrabony defects appear to be reproducible models to evaluate candidate technologies for periodontal regeneration. J Periodontol 2004:75:229-235.
KEYWORDS: Animal studies, periodontal diseases/surgery, periodontal regeneration, surgical flaps, wound healing
