Conditions inhibiting eruption of permanent first molars

Hidenobu Matsuzaki, Yoshinobu Yanagi, Naoki Katase, Hitoshi Nagatsuka, Marina Hara, Masakazu Ashida, Teruhisa Unetsubo, Akiko Sato, Mariko Fujita, Toshihiko Takenobu, Jun-Ichi Asaumi

Research output: Contribution to journalArticle

3 Citations (Scopus)


Purpose: The purpose of this study was to evaluate the radiological and histopathological findings of 11 patients with unerupted first molars to verify the factors obstructing spontaneous eruption. Methods: The patients' clinical, radiological, and histopathological data were evaluated retrospectively to determine histopathological diagnosis, radiographic findings, methods of surgical management, and postoperative course. Results: This study involved 4 male and 7 female patients (mean age=9.5 years old). Nine cases involved the mandible. The patients' histopathological diagnoses included 3 odontogenic tumors, 2 odontogenic cysts, and 6 hyperplastic dental follicles. Radiographically, 10 cases showed characterless enlargement of the follicular space, while only 1 displayed radiopaque bodies. One patient with a tumor underwent enucleation, and 1 with a cyst underwent cystectomy and tooth extraction. The others underwent wide excision or partial excision of the surrounding tissue at the top of the impacted tooth. Tumor relapse was observed in 3 cases. Conclusion: Surgeons should perform aggressive treatment for patients with unerupted teeth because spontaneous eruption is rare in cases involving non-neoplastic lesions such as hyperplastic dental follicles.

Original languageEnglish
Pages (from-to)67-70
Number of pages4
JournalPediatric Dentistry
Issue number1
Publication statusPublished - Jan 2013



  • Impacted
  • Molar
  • Odontogenic cycts
  • Odontogenic tumors
  • Unerupted

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Matsuzaki, H., Yanagi, Y., Katase, N., Nagatsuka, H., Hara, M., Ashida, M., Unetsubo, T., Sato, A., Fujita, M., Takenobu, T., & Asaumi, J-I. (2013). Conditions inhibiting eruption of permanent first molars. Pediatric Dentistry, 35(1), 67-70.