Abstract
Background The authors conducted a retrospective cohort study to investigate external apical root resorption (EARR) and alveolar bone loss (ABL) after protraction of the mandibular molars by using miniscrews. Methods The authors protracted 51 mandibular molars in 37 adults into an edentulous area by using sliding mechanics with a lever arm or a miniscrew-supported root spring. The authors measured root length and alveolar bone height on panoramic radiographs and corrected according to the crown length registration method. The authors measured the amounts of crown movement (CM) and root movement (RM) on the superimposed lateral cephalometric radiographs along the mandibular occlusal plane. The authors used a linear mixed model to determine the risk factors for EARR and ABL. Results All edentulous spaces closed successfully in an average of 31.7 months, and the average CM and RM were 4.97 and 8.64 millimeters, respectively, with an RM:CM ratio of 2.81. The root length decreased significantly by 0.80 mm (5.53%), but EARR of more than 2 mm occurred in only 4.0% of molars. The alveolar bone height was reduced significantly by 0.56 mm, but ABL of more than 2 mm occurred in only 2.0% of molars. Linear mixed model results revealed that EARR and ABL correlated only with RM and age, respectively. Conclusions Protraction of the mandibular molars into an edentulous area by using miniscrews was effective and safe, especially in younger adults. Practical Implications Protraction of the mandibular molars can be considered as an alternative treatment to conventional prosthetic treatment in the restoration of edentulous space, especially in young adults, if patients accept longer treatment duration.
| Original language | English |
|---|---|
| Pages (from-to) | 820-829 |
| Number of pages | 10 |
| Journal | Journal of the American Dental Association |
| Volume | 146 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2015 Nov |
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All Science Journal Classification (ASJC) codes
- Dentistry(all)
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Mandibular molar protraction as an alternative treatment for edentulous spaces : Focus on changes in root length and alveolar bone height. / Kim, Sung Jin; Sung, Eui Hyang; Kim, Jin Wook; Baik, Hyoung Seon; Lee, Kee Joon.
In: Journal of the American Dental Association, Vol. 146, No. 11, 11.2015, p. 820-829.Research output: Contribution to journal › Article
TY - JOUR
T1 - Mandibular molar protraction as an alternative treatment for edentulous spaces
T2 - Focus on changes in root length and alveolar bone height
AU - Kim, Sung Jin
AU - Sung, Eui Hyang
AU - Kim, Jin Wook
AU - Baik, Hyoung Seon
AU - Lee, Kee Joon
PY - 2015/11
Y1 - 2015/11
N2 - Background The authors conducted a retrospective cohort study to investigate external apical root resorption (EARR) and alveolar bone loss (ABL) after protraction of the mandibular molars by using miniscrews. Methods The authors protracted 51 mandibular molars in 37 adults into an edentulous area by using sliding mechanics with a lever arm or a miniscrew-supported root spring. The authors measured root length and alveolar bone height on panoramic radiographs and corrected according to the crown length registration method. The authors measured the amounts of crown movement (CM) and root movement (RM) on the superimposed lateral cephalometric radiographs along the mandibular occlusal plane. The authors used a linear mixed model to determine the risk factors for EARR and ABL. Results All edentulous spaces closed successfully in an average of 31.7 months, and the average CM and RM were 4.97 and 8.64 millimeters, respectively, with an RM:CM ratio of 2.81. The root length decreased significantly by 0.80 mm (5.53%), but EARR of more than 2 mm occurred in only 4.0% of molars. The alveolar bone height was reduced significantly by 0.56 mm, but ABL of more than 2 mm occurred in only 2.0% of molars. Linear mixed model results revealed that EARR and ABL correlated only with RM and age, respectively. Conclusions Protraction of the mandibular molars into an edentulous area by using miniscrews was effective and safe, especially in younger adults. Practical Implications Protraction of the mandibular molars can be considered as an alternative treatment to conventional prosthetic treatment in the restoration of edentulous space, especially in young adults, if patients accept longer treatment duration.
AB - Background The authors conducted a retrospective cohort study to investigate external apical root resorption (EARR) and alveolar bone loss (ABL) after protraction of the mandibular molars by using miniscrews. Methods The authors protracted 51 mandibular molars in 37 adults into an edentulous area by using sliding mechanics with a lever arm or a miniscrew-supported root spring. The authors measured root length and alveolar bone height on panoramic radiographs and corrected according to the crown length registration method. The authors measured the amounts of crown movement (CM) and root movement (RM) on the superimposed lateral cephalometric radiographs along the mandibular occlusal plane. The authors used a linear mixed model to determine the risk factors for EARR and ABL. Results All edentulous spaces closed successfully in an average of 31.7 months, and the average CM and RM were 4.97 and 8.64 millimeters, respectively, with an RM:CM ratio of 2.81. The root length decreased significantly by 0.80 mm (5.53%), but EARR of more than 2 mm occurred in only 4.0% of molars. The alveolar bone height was reduced significantly by 0.56 mm, but ABL of more than 2 mm occurred in only 2.0% of molars. Linear mixed model results revealed that EARR and ABL correlated only with RM and age, respectively. Conclusions Protraction of the mandibular molars into an edentulous area by using miniscrews was effective and safe, especially in younger adults. Practical Implications Protraction of the mandibular molars can be considered as an alternative treatment to conventional prosthetic treatment in the restoration of edentulous space, especially in young adults, if patients accept longer treatment duration.
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UR - http://www.scopus.com/inward/citedby.url?scp=84945283225&partnerID=8YFLogxK
U2 - 10.1016/j.adaj.2015.04.025
DO - 10.1016/j.adaj.2015.04.025
M3 - Article
C2 - 26514887
AN - SCOPUS:84945283225
VL - 146
SP - 820
EP - 829
JO - Journal of the American Dental Association
JF - Journal of the American Dental Association
SN - 0002-8177
IS - 11
ER -