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Arch Oral Biol. 2018 Mar;87:191-195. doi: 10.1016/j.archoralbio.2017.12.020. Epub 2017 Dec 23.

Histological and chemical analyses of mesiodens development and mineralization.

Author information

1
Barzilai Medical University Center, Ashkelon, 7830604, Israel. Electronic address: mo.awady@hotmail.com.
2
Department of Pediatric Dentistry, The Hebrew University - Hadassah School of Dental Medicine, Jerusalem, Israel. Electronic address: motim@ekmd.huji.ac.il.
3
Barzilai Medical University Center, Ashkelon, 7830604, Israel. Electronic address: ornitc@bmc.gov.il.
4
Barzilai Medical University Center, Ashkelon, 7830604, Israel. Electronic address: uri-z@smile.net.il.

Abstract

OBJECTIVE:

This study aimed to compare the developmental timing and mineralization quality of mesiodentes, i.e., supernumerary teeth located mainly in the midline of the maxilla between the central incisors, with the developmental timing and mineralization quality of permanent and primary central incisors.

DESIGN:

Sixteen mesiodentes, nine permanent and seven primary central incisors were collected. The location of the neonatal line was determined using a light microscope at 10× or 20× enlargements. Chemical composition of the enamel at two locations was analyzed using energy dispersive X-ray spectrometer.

RESULTS:

Neonatal lines were observed in eight out of 16 mesiodentes, in all primary central incisors and in none of the permanent central incisors. Chemical analyses showed that mesiodentes mineralization was impaired, resulting in higher amount of organic ions and reduced inorganic ions. Discriminant analysis showed minimal overlap of mesiodentes with either primary or permanent centrals.

CONCLUSIONS:

Mesiodentes development begins before birth in 50% of the cases but later than the primary centrals. Mineralization of mesiodens is impaired with less mineral content and higher organic content. The results showed that mesiodentes are a special group of teeth with defective morpho-differentiation and mineralization, with little similarity to primary or permanent central incisors.

KEYWORDS:

Chemical analysis; Enamel; Mesiodentes; Supernumerary teeth

[Indexed for MEDLINE]

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