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[The study on third molar changes following second molar extraction (1)].

Y K Ryu1

  • 1Dept. of Orthodontics, College of Dentistry, Yonsei University.

Taehan Ch'Ikkwa Uisa Hyophoe Chi
|December 1, 1990
PubMed
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Tooth eruption after molar extraction depends on the angle and developmental stage at extraction. Lower third molar eruption is more favorable with smaller pre-extraction angles and earlier Nolla stages.

Area of Science:

  • Dentistry
  • Orthodontics
  • Oral Surgery

Background:

  • Third molar eruption is a complex process influenced by various factors.
  • Extraction of second molars can impact the development and eruption pathway of adjacent third molars.

Purpose of the Study:

  • To evaluate the effect of second molar extraction on third molar changes.
  • To determine the influence of pre-extraction angulation and Nolla's developmental stages on third molar eruption following second molar extraction.

Main Methods:

  • Orthopantomograms were used to observe changes in third molars after second molar extraction.
  • Study included 96 cases of upper second molar extraction and 74 cases of lower second molar extraction.
  • Subjects were analyzed based on pre-extraction angulation (under/above 25 degrees) and Nolla's stages (4-5 vs. 6-8).

Related Experiment Videos

Main Results:

  • Favorable upper third molar eruption was observed in both angulation groups (under/above 25 degrees).
  • Lower third molar eruption was more favorable with pre-extraction angles under 25 degrees.
  • Favorable upper third molar eruption occurred in both Nolla's Stage 4-5 and Stage 6-8 groups.
  • Lower third molar eruption was more favorable in the Nolla's Stage 4-5 group compared to Stage 6-8.

Conclusions:

  • Pre-extraction angulation and Nolla's developmental stage significantly influence third molar eruption after second molar extraction.
  • Lower third molars benefit from earlier extraction (Nolla's Stage 4-5) and smaller angulation (<25 degrees) for favorable eruption.
  • Understanding these factors aids in predicting and managing third molar development post-extraction.