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The changes of root length and form in immature teeth after orthodontic treatment  

Kim, Heyon-A (Department of Orthodontics, Pusan National University)
Park, Soo-Byung (Department of Orthodontics, Pusan National University)
Publication Information
The korean journal of orthodontics / v.34, no.3, 2004 , pp. 241-251 More about this Journal
Abstract
Previous studies have focused on the causes of root resorption after orthodontic treatment and treatment methods to reduce this phenomenon, and have been mainly associated with developed, mature roots. As parents become increasingly interested in their children's' dentition, orthodontists are performing fixed orthodontic treatment on patients of less than 10 years and before the completion of the immature root. Thus, the author evaluated the changes of root length and root form of maxillary immature incisors after orthodontic treatment, compared with those of mature teeth, and investigated the correlation according to gender, treatment duration, and displacement of incisors. The sample consisted of an immature root group of twenty-eight persons (between 8 and 10 years old) and a mature root group of thirty-one persons (between 11 and 15 years old). The crown and root length of the maxillary four incisors were measured with a periapical radiograph, changes in root length and crown-root ratio were calculated, and root form was classified according to a scoring system. The results were as follows. 1. The development of immature roots was not affected by orthodontic treatment and mostly showed normal root length and apical form. 2. Root length of immature teeth was sustained or became shorter, partially in long treatment duration or with open bite patients. Even though the teeth reached their normal root length, they demonstrated a blunt form. 3. Most of the mature roots showed mild resorption, and the form of mature roots was more blunt than the developed form of the immature roots (p<0.05). 4. The developed form of the immature roots was statistically related to treatment duration, while the form of the mature roots was significantly related to the displacement of incisors (p<0.05). 5. In contrast, other variables such as gender, classification of malocclusion, changes in overbite, and changes of U1 to SN showed no correlation with the root resorption of both groups.
Keywords
Immature root; Change of root length; Root apical shape; Crown-root ratio;
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  • Reference
1 Linge BO, Linge L. Apical root resorption in upper anterior teeth. Eur J Orthod 1983 : 5 : 173-83
2 Kennedy DB, Joondeph DR, Osterberg SK, Little RM. The effect of extraction and orthodontic treatment on dentoalveolar support. Am J Orthod 1983 : 84 : 183-90
3 Dougherty HL. The effect of mechanical forces upon the mandibular buccal segments during orthodontic treatment. Part I. Am J Orthod 1968 : 54 : 29-49
4 Linge L, Linge BO. Patient characteristic and treatment variables associated with apical root resorption during orthodontic treatment. Am J Orthod Dentofac Orthop 1991 : 99 : 35-43
5 McLaughlin KD. Quantitative determination of root resorption during orthodontic treatment. Am J Orthod 1964 : 50 : 143
6 Chung-Ju Hwang, Young-yoon Song. A radiographic study on root resorption in the Malocclusion patients before orthodontic treatment. Korea J Orthod 1999 : 29 : 219-37
7 Harris EF, Hassankiadeh S, Harris JT. Maxillary incisor crown-root relationships in different angle malocclusions. Am J Orthod Dentofac Orthop 1993 : 103 : 48-53
8 Harris EF, Hassankiadeh S, Harris JT. Maxillary Incisor crown-root relationships in different angle malocclusions. Am J Orthod Dentofac Orthop 1993 : 103 : 48-53
9 Dougherty HL. The effect of mechanical forces upon the mandibular buccal segments during orthodontic treatment. Part II. Am J Orthod 1968 : 54 : 83-103
10 Levander E, Malmgren O. Evaluation of the risk of root resorption during orthodontic treatment : a study of upper incisors. Eur J Orthod 1988 : 10: 30-8
11 DeShields RW. A study of root resorption in treated Class II Division 1 malocclusion. Angle Orthod 1969 : 39 : 231-45
12 Rosenberg MN. An evaluation of the incidence and amount of apical root resorption and dilacerations occurring in orthodontically treated teeth, having incompletely formed roots at the beginning of Begg treatment. Am J Orthod 1972 : 61: 524-5
13 Parker RJ, Harris EF. Directions of orthodontic tooth movements associated with external apical root resorption of maxillary central incisor. Am J Orthod Dentofac Orthop 1998 : 114: 677-83
14 Brezniak N, Wasseristein A. Root resorption after orthodontic treatment : Part 2. Literatane review. Am J Orthod Dentotac Orthop 1993 : 103 : 138-46   DOI   ScienceOn
15 Sameshima GT, Sinclaic PW. Predicting and preventing root resorption : Part II. Treatment factors. Am J Orthod Dentofac Orthop2001 : 119 : 511-5
16 Alexander SA. Levels of root resorption associated with continuous arch and sectional arch mechanics. Am J Orthod Dentofac Onhop. 1996 : 110 : 321-4
17 Rygh P. Orthodontic root resorption studied by electron microscopy. Angle Orthod 1977 : 47 : 1-16
18 Sameshima GT, Asgarifar KO. Assessment of root resorption and root shape periapical vs panoramic films. Angle orthod 2001 : 71 : 185-9
19 VonderAhe G. Postretention status of maxillary incisors with rootend resorption. Angle Orthod 1973 : 43 : 247-55
20 Baumund S, Korn EL, Boyd RL. Apical root resorption in orthodontically treated adults. Am J Orthod Dentofac Orthop 1996 : 110: 2311-20
21 Newman WG. Possible etiologic factors in external root resorption. Am J Orthod 1975 : 67 : 522-39
22 Janson GRP. et. al. A radiographic comparison of apical root resorption after orthodontic treatment with 3 different fixed appliance technique. Am J Orthod Dentofac Orthop 1999 : 118 : 262-73
23 Blake M, Woodside DG, Pharoah MJ. A radiographic comparison of apical root resorption after orthodontic treatment with the edgewise and speed appliances. Am J Orthod Dentofac Orthop 1995 : 108 : 76-84
24 Slagsvold O, Bjercke B. Autotransplantation of premolars with partly-formed roots. A radiographic study of root growth. Am J Orthod Dentofac Orthop 1974: 66 : 355-66
25 Phillips JR. Apical root resorption under orthodontic therapy. Angle Orthod 1955 : 25 : 1-12
26 Stenvik A, Mjor IA. Pulp and dentic reactions to experimental tooth Intrusion. A histologic study of the initial changes. Am J Orthod 1970 : 57 : 370-85
27 Harry MR, Sims MR. Root resorption in bicuspid intrusion : A scanning electromicroscopic study. Angle Orthod 1982 : 52 : 235-58   PUBMED
28 McFadden WM, Engstrom C, Engstrom H . A study of the relationship between incisor intrusion and root shortening. Am J Orthod Dentofac Orthop 1989 : 96 : 390-6
29 Massier M, Malone AJ. Root resorption in human permanent teeth. Am J Orthod 1954 : 40 : 619-33