Last Modified

• March 21, 2019

Creator

• Olmsted, Matthew J.
  • Affiliation: School of Dentistry, Department of Orthodontics

Abstract

• Hypodontia is a common clinical challenge in orthodontics and dentistry. It occurs as a syndrome--ectodermal dysplasia (ED) and as non-syndromic tooth agenesis (NSTA). This study quantifies patterns of agenesis and tooth morphology between ED (n=37) and NSTA (n=81) groups. 118 radiographs and 58 dental casts were measured for presence/absence and mesiodistal width of permanent teeth. In addition, the conicity of the maxillary incisors was determined using a novel index. 88 affected (ED or NSTA) individuals were genotyped using 1474 SNPs of candidate genes (AXIN2, BMP4, EDA, MSX1, and PAX9). Multivariate analyses determined that specific SNPs in BMP4 and MSX1 best explain the genetic differences between the two groups. When compared to NSTA, ED had reduced tooth widths, more conical maxillary incisors, and a higher occurrence of missing teeth (p<0.05), excluding mandibular second premolars. The new measure of conicity detected differences between control, ED, and NSTA groups.

Date of publication

• May 2011

DOI

• https://doi.org/10.17615/zqnj-m921

Resource type

• Masters Thesis

Rights statement

• In Copyright

Note

• "... in partial fulfillment of the requirements for the degree of Master of Science in the School of Dentistry (Orthodontics)."

Advisor

• Frazier-Bowers, Sylvia

Degree granting institution

• University of North Carolina at Chapel Hill

Language

• English

Publisher

• University of North Carolina at Chapel Hill

Place of publication

• Chapel Hill, NC

Access

• Open access

Parents:

This work has no parents.

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	Phenotype characterization and candidate genotyping of hypodontia in ectodermal dysplasia (ED) and non-syndromic groups	2019-04-08	Public	Press to Select an action Download