Tracy Cheung1, Juyoung Park2, Deborah Lee3, Catherine Kim3, Jeffrey Olson3, Shadi Javadi4, Gregory Lawson5, James McCabe6, Won Moon7, Kang Ting8, Christine Hong9. 1. Resident, Section of Orthodontics, School of Dentistry, University of California at Los Angeles, Los Angeles, Calif. 2. Graduate student, Division of Oral Biology, University of California at Los Angeles, Los Angeles, Calif. 3. Graduate student, School of Dentistry, University of California at Los Angeles, Los Angeles, Calif. 4. Assistant project scientist, Section of Orthodontics, School of Dentistry, University of California at Los Angeles, Los Angeles, Calif. 5. Director, Pathology and Laboratory Medicine, Division of Laboratory Animal Medicine, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, Calif. 6. Training manager, Division of Laboratory Animal Medicine, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, Calif. 7. Clinical associate professor, Section of Orthodontics, School of Dentistry, University of California at Los Angeles, Los Angeles, Calif. 8. Chair and professor, Section of Orthodontics, School of Dentistry, University of California at Los Angeles, Los Angeles, Calif. 9. Assistant professor, Section of Orthodontics, School of Dentistry, University of California at Los Angeles, Los Angeles, Calif. Electronic address: chong@dentistry.ucla.edu.
Abstract
INTRODUCTION: Although current techniques for accelerated tooth movement often involve invasive surgical procedures, micro-osteoperforations (MOPs) using mini-implants may facilitate orthodontic tooth movement without raising flaps, reduce surgical risks, and increase patient acceptance. In this study, we evaluated the effectiveness of mini-implant-facilitated MOPs in inducing accelerated tooth movement and investigated the potential risks for root resorption. METHODS: Five MOPs were placed on the left side around the maxillary first molars in 6 rats using an automated mini-implant driver, whereas the right side received no MOPs as the control. Closed-coiled springs were secured from incisors to first molars for orthodontic tooth movement. Tooth movement was measured, and samples underwent radiologic and histologic analyses. RESULTS: The MOP side exhibited a 1.86-fold increase in the rate of tooth movement with decreased bone density and bone volume around the first molars compared with the control side. Hematoxylin and eosin and tartrate-resistant acid phosphatase analyses showed increased numbers of osteoclasts as well as new bone formation. Three-dimensional volumetric analysis of all 5 roots of the maxillary first molars demonstrated no statistically significant difference in root volumes. CONCLUSIONS: Mini-implant-facilitated MOPs accelerated tooth movement without increased risk for root resorption and therefore may become a readily available and efficient treatment option to shorten orthodontic treatment time with improved patient acceptance. Copyright Â
INTRODUCTION: Although current techniques for accelerated tooth movement often involve invasive surgical procedures, micro-osteoperforations (MOPs) using mini-implants may facilitate orthodontic tooth movement without raising flaps, reduce surgical risks, and increase patient acceptance. In this study, we evaluated the effectiveness of mini-implant-facilitated MOPs in inducing accelerated tooth movement and investigated the potential risks for root resorption. METHODS: Five MOPs were placed on the left side around the maxillary first molars in 6 rats using an automated mini-implant driver, whereas the right side received no MOPs as the control. Closed-coiled springs were secured from incisors to first molars for orthodontic tooth movement. Tooth movement was measured, and samples underwent radiologic and histologic analyses. RESULTS: The MOP side exhibited a 1.86-fold increase in the rate of tooth movement with decreased bone density and bone volume around the first molars compared with the control side. Hematoxylin and eosin and tartrate-resistant acid phosphatase analyses showed increased numbers of osteoclasts as well as new bone formation. Three-dimensional volumetric analysis of all 5 roots of the maxillary first molars demonstrated no statistically significant difference in root volumes. CONCLUSIONS: Mini-implant-facilitated MOPs accelerated tooth movement without increased risk for root resorption and therefore may become a readily available and efficient treatment option to shorten orthodontic treatment time with improved patient acceptance. Copyright Â
Authors: S Susan Baloul; Louis C Gerstenfeld; Elise F Morgan; Roberto S Carvalho; Thomas E Van Dyke; Alpdogan Kantarci Journal: Am J Orthod Dentofacial Orthop Date: 2011-04 Impact factor: 2.650
Authors: Lei Wang; Won Lee; De-Lin Lei; Yan-Pu Liu; Dennis-Duke Yamashita; Stephen L-K Yen Journal: Am J Orthod Dentofacial Orthop Date: 2009-12 Impact factor: 2.650