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A generational comparison of changes in mandibular third molars.
1Department of Radiology, Kyushu Dental College, Kitakyushu, Japan.
Summary
Generational differences show increased abnormal eruption angles in mandibular third molars. These impacted teeth are now closer to the mandibular canal, posing potential risks.
Area of Science:
- Dentistry
- Oral and Maxillofacial Radiology
Background:
- Recent increases in embedded mandibular third molar cases noted.
- Investigated generational shifts in third molar impaction and eruption patterns.
Purpose of the Study:
- To compare the occurrence and angulation of mandibular third molars between two distinct student generations.
- To assess changes in proximity to the mandibular canal over time.
Main Methods:
- Analysis of 670 panoramic radiographs from two student cohorts (1970s and 1990s).
- Statistical comparison of third molar eruption angles and positions relative to the mandibular canal.
Main Results:
- Significant statistical differences observed in third molar eruption angles between the 1970s and 1990s groups.
- Mandibular third molars in the 1990s group exhibited significantly more abnormal eruption angles (P < 0.05).
- Third molars in the 1990s group were significantly closer to the mandibular canal (P < 0.05).
Conclusions:
- Mandibular third molar eruption patterns have changed significantly between the 1970s and 1990s.
- Increased impaction and proximity to the mandibular canal in recent generations may necessitate altered surgical approaches.