Mandibular molar protraction as an alternative treatment for edentulous spaces: Focus on changes in root length and alveolar bone height

Sung Jin Kim, Eui Hyang Sung, Jin Wook Kim, Hyoung Seon Baik, Kee Joon Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

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 languageEnglish
Pages (from-to)820-829
Number of pages10
JournalJournal of the American Dental Association
Volume146
Issue number11
DOIs
Publication statusPublished - 2015 Nov

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Root Resorption
Alveolar Bone Loss
Crowns
Bone and Bones
Young Adult
Linear Models
Cephalometry
Dental Occlusion
Mechanics
Cohort Studies
Therapeutics
Retrospective Studies

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

Cite this

@article{30042f8de37e49b1a1588baa8e9f1bb6,
title = "Mandibular molar protraction as an alternative treatment for edentulous spaces: Focus on changes in root length and alveolar bone height",
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.",
author = "Kim, {Sung Jin} and Sung, {Eui Hyang} and Kim, {Jin Wook} and Baik, {Hyoung Seon} and Lee, {Kee Joon}",
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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 journalArticle

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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