Man-Suk Baek1, Yoon-Jeong Choi2, Hyung-Seog Yu3, Kee-Joon Lee4, Jinny Kwak1, Young-Chel Park5. 1. Graduate student, Department of Orthodontics, Oral Science Research Center, Instititute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea. 2. Clincial and research assistant professor, Department of Orthodontics, Oral Science Research Center, Instititute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea. 3. Professor, Department of Orthodontics, Oral Science Research Center, Instititute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea. 4. Associate professor, Department of Orthodontics, Oral Science Research Center, Instititute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea. 5. Professor, Department of Orthodontics, Oral Science Research Center, Instititute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea. Electronic address: ypark@yuhs.ac.
Abstract
INTRODUCTION: Anterior open bite results from the combined influences of skeletal, dental, functional, and habitual factors. The long-term stability of anterior open bite corrected with absolute anchorage has not been thoroughly investigated. The purpose of this study was to examine the long-term stability of anterior open-bite correction with intrusion of the maxillary posterior teeth. METHODS: Nine adults with anterior open bite were treated by intrusion of the maxillary posterior teeth. Lateral cephalographs were taken immediately before and after treatment, 1 year posttreatment, and 3 years posttreatment to evaluate the postintrusion stability of the maxillary posterior teeth. RESULTS: On average, the maxillary first molars were intruded by 2.39 mm (P<0.01) during treatment and erupted by 0.45 mm (P<0.05) at the 3-year follow-up, for a relapse rate of 22.88%. Eighty percent of the total relapse of the intruded maxillary first molars occurred during the first year of retention. Incisal overbite increased by a mean of 5.56 mm (P<0.001) during treatment and decreased by a mean of 1.20 mm (P<0.05) by the end of the 3-year follow-up period, for a relapse rate of 17.00%. Incisal overbite significantly relapsed during the first year of retention (P<0.05) but did not exhibit significant recurrence between the 1-year and 3-year follow-ups. CONCLUSIONS: Most relapse occurred during the first year of retention. Thus, it is reasonable to conclude that the application of an appropriate retention method during this period clearly enhances the long-term stability of the treatment.
INTRODUCTION: Anterior open bite results from the combined influences of skeletal, dental, functional, and habitual factors. The long-term stability of anterior open bite corrected with absolute anchorage has not been thoroughly investigated. The purpose of this study was to examine the long-term stability of anterior open-bite correction with intrusion of the maxillary posterior teeth. METHODS: Nine adults with anterior open bite were treated by intrusion of the maxillary posterior teeth. Lateral cephalographs were taken immediately before and after treatment, 1 year posttreatment, and 3 years posttreatment to evaluate the postintrusion stability of the maxillary posterior teeth. RESULTS: On average, the maxillary first molars were intruded by 2.39 mm (P<0.01) during treatment and erupted by 0.45 mm (P<0.05) at the 3-year follow-up, for a relapse rate of 22.88%. Eighty percent of the total relapse of the intruded maxillary first molars occurred during the first year of retention. Incisal overbite increased by a mean of 5.56 mm (P<0.001) during treatment and decreased by a mean of 1.20 mm (P<0.05) by the end of the 3-year follow-up period, for a relapse rate of 17.00%. Incisal overbite significantly relapsed during the first year of retention (P<0.05) but did not exhibit significant recurrence between the 1-year and 3-year follow-ups. CONCLUSIONS: Most relapse occurred during the first year of retention. Thus, it is reasonable to conclude that the application of an appropriate retention method during this period clearly enhances the long-term stability of the treatment.
Authors: J T Zupnik; M Ioshida; M Yatabe; A C O Ruellas; L R Gomes; S Aronovich; E Benavides; S P Edwards; B Paniagua; L H S Cevidanes Journal: Int J Oral Maxillofac Surg Date: 2019-02-01 Impact factor: 2.789