Related Experiment Video
Updated: Aug 30, 2025
07:26
Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
Published on: August 22, 2022
1.5K
Sexual dimorphism in deciduous tooth crown size: Variability within and between groups.
1Department of Anthropology, University of Oregon, Eugene, Oregon, USA.
Summary
Sexual dimorphism in deciduous teeth is low and shows little variation across global populations. This finding is important for identifying sex in archaeological and forensic contexts.
Area of Science:
- Anthropology
- Forensic Science
- Odontology
Background:
- Sexual dimorphism in deciduous teeth is less studied than in permanent teeth.
- Deciduous tooth crown size is utilized for sex identification in sub-adults.
- Understanding this dimorphism is crucial for archaeological and forensic applications.
Purpose of the Study:
- To document variations in sexual dimorphism within and between global populations.
- To analyze sexual dimorphism in deciduous tooth crown size.
- To compare dimorphism patterns with permanent teeth.
Main Methods:
- Compiled mean deciduous tooth crown size data from 37 published groups.
- Calculated percent sexual dimorphism (SD) using mesiodistal (MD) and buccolingual (BL) dimensions.
- Employed statistical analyses including significance tests, correlation, regression, and cluster analysis.
Main Results:
- Overall mean percent sexual dimorphism (%SD) was low (1.77%) across 26 groups.
- No significant difference in %SD between MD (1.68%) and BL (1.72%) dimensions.
- Incisors, canines, and molars exhibited the most dimorphism in deciduous teeth.
Conclusions:
- Deciduous tooth crown size exhibits lower and more variable sexual dimorphism than permanent teeth.
- Developmental, chromosomal, and hormonal factors may influence these differences.
- Sexual dimorphism in deciduous teeth is not associated with ethnicity in the global sample.
Related Concept Videos
01:15Teeth
596
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
596
01:21Tooth Anatomy
922
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
922
01:21Testing a Claim about Mean: Unknown Population SD
3.6K
A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used;...
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used;...
3.6K
01:46Types of Selection
41.3K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
41.3K
01:20Mate Choice
10.3K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
10.3K