Abstract

Background/purpose: Whether third molars contribute to or aggravate relapse, particularly in the mandibular dental arch, after orthodontic treatment remains controversial. Orthodontic clinicians vary widely in their practice regarding prophylactic third molar removal after orthodontic treatment. The present study systematically reviewed and meta-analyzed the available literature, and assessed the impact of third molar removal on the relapse of mandibular dental arch alignment after orthodontic treatment. Materials and methods: Relevant literature was searched on online databases, namely Pubmed, Embase, and Cochrane. Outcomes of post-orthodontic mandibular relapse were evaluated in terms of the Little's irregularity index, intermolar width, and arch length. Statistical analysis was conducted using the Review Manager software (Version 5.3, The Cochrane Collaboration, Oxford, England). Results: Our initial search strategy yielded 360 citations, of which three retrospective studies were selected. The Little's irregularity index (weighted mean difference = 0.80, 95% confidence interval = 0.13-1.47, P = 0.02) differed significantly between the erupted third molar extraction group and agenesis third molar group; whereas the arch length and intermolar width did not. No outcome differed significantly between the impacted third molar extraction group and agenesis third molar group. Conclusion: Removal of the mandibular third molars is recommended for alleviating or preventing long-term incisor irregularity.

Original languageEnglish
JournalJournal of Dental Sciences
DOIs
Publication statusPublished - 2018

Fingerprint

Third Molar
Orthodontics
Meta-Analysis
Recurrence
Dental Arch
Incisor
PubMed
England
Therapeutics
Software
Retrospective Studies
Databases
Confidence Intervals

Keywords

  • Little's irregularity index
  • Post-orthodontic mandibular relapse
  • Prophylactic third molar removal
  • Third molars

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

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title = "Impact of third molars on mandibular relapse in post-orthodontic patients: A meta-analysis",
abstract = "Background/purpose: Whether third molars contribute to or aggravate relapse, particularly in the mandibular dental arch, after orthodontic treatment remains controversial. Orthodontic clinicians vary widely in their practice regarding prophylactic third molar removal after orthodontic treatment. The present study systematically reviewed and meta-analyzed the available literature, and assessed the impact of third molar removal on the relapse of mandibular dental arch alignment after orthodontic treatment. Materials and methods: Relevant literature was searched on online databases, namely Pubmed, Embase, and Cochrane. Outcomes of post-orthodontic mandibular relapse were evaluated in terms of the Little's irregularity index, intermolar width, and arch length. Statistical analysis was conducted using the Review Manager software (Version 5.3, The Cochrane Collaboration, Oxford, England). Results: Our initial search strategy yielded 360 citations, of which three retrospective studies were selected. The Little's irregularity index (weighted mean difference = 0.80, 95{\%} confidence interval = 0.13-1.47, P = 0.02) differed significantly between the erupted third molar extraction group and agenesis third molar group; whereas the arch length and intermolar width did not. No outcome differed significantly between the impacted third molar extraction group and agenesis third molar group. Conclusion: Removal of the mandibular third molars is recommended for alleviating or preventing long-term incisor irregularity.",
keywords = "Little's irregularity index, Post-orthodontic mandibular relapse, Prophylactic third molar removal, Third molars",
author = "Cheng, {Hsin Chung} and Peng, {Bou Yue} and Hsieh, {Hsueh Yin} and Tam, {Ka Wai}",
year = "2018",
doi = "10.1016/j.jds.2017.10.005",
language = "English",
journal = "Journal of Dental Sciences",
issn = "1991-7902",
publisher = "中華牙醫學會",

}

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T1 - Impact of third molars on mandibular relapse in post-orthodontic patients

T2 - A meta-analysis

AU - Cheng, Hsin Chung

AU - Peng, Bou Yue

AU - Hsieh, Hsueh Yin

AU - Tam, Ka Wai

PY - 2018

Y1 - 2018

N2 - Background/purpose: Whether third molars contribute to or aggravate relapse, particularly in the mandibular dental arch, after orthodontic treatment remains controversial. Orthodontic clinicians vary widely in their practice regarding prophylactic third molar removal after orthodontic treatment. The present study systematically reviewed and meta-analyzed the available literature, and assessed the impact of third molar removal on the relapse of mandibular dental arch alignment after orthodontic treatment. Materials and methods: Relevant literature was searched on online databases, namely Pubmed, Embase, and Cochrane. Outcomes of post-orthodontic mandibular relapse were evaluated in terms of the Little's irregularity index, intermolar width, and arch length. Statistical analysis was conducted using the Review Manager software (Version 5.3, The Cochrane Collaboration, Oxford, England). Results: Our initial search strategy yielded 360 citations, of which three retrospective studies were selected. The Little's irregularity index (weighted mean difference = 0.80, 95% confidence interval = 0.13-1.47, P = 0.02) differed significantly between the erupted third molar extraction group and agenesis third molar group; whereas the arch length and intermolar width did not. No outcome differed significantly between the impacted third molar extraction group and agenesis third molar group. Conclusion: Removal of the mandibular third molars is recommended for alleviating or preventing long-term incisor irregularity.

AB - Background/purpose: Whether third molars contribute to or aggravate relapse, particularly in the mandibular dental arch, after orthodontic treatment remains controversial. Orthodontic clinicians vary widely in their practice regarding prophylactic third molar removal after orthodontic treatment. The present study systematically reviewed and meta-analyzed the available literature, and assessed the impact of third molar removal on the relapse of mandibular dental arch alignment after orthodontic treatment. Materials and methods: Relevant literature was searched on online databases, namely Pubmed, Embase, and Cochrane. Outcomes of post-orthodontic mandibular relapse were evaluated in terms of the Little's irregularity index, intermolar width, and arch length. Statistical analysis was conducted using the Review Manager software (Version 5.3, The Cochrane Collaboration, Oxford, England). Results: Our initial search strategy yielded 360 citations, of which three retrospective studies were selected. The Little's irregularity index (weighted mean difference = 0.80, 95% confidence interval = 0.13-1.47, P = 0.02) differed significantly between the erupted third molar extraction group and agenesis third molar group; whereas the arch length and intermolar width did not. No outcome differed significantly between the impacted third molar extraction group and agenesis third molar group. Conclusion: Removal of the mandibular third molars is recommended for alleviating or preventing long-term incisor irregularity.

KW - Little's irregularity index

KW - Post-orthodontic mandibular relapse

KW - Prophylactic third molar removal

KW - Third molars

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