Related Experiment Video
Updated: Jun 13, 2026

Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
Published on: March 29, 2018
Dental caries experience in young Australian Army recruits 2008
M S Hopcraft1, K E Yapp, G Mahoney
1Melbourne Dental School, Cooperative Research Centre for Oral Health Science, The University of Melbourne, Victoria. m.hopcraft@unimelb.edu.au
Background:
Recent studies have shown a substantial decline in caries experience in Australian Army recruits between 1996 and 2002-2003, and in Australian adults between 1987-1988 and 2004-2006. However, studies in children have reported an increasing trend in caries experience between 1998 and 2002. The aim of this study was to investigate caries experience in Australian Army recruits in 2008.
Methods:
A cross-sectional study involving 1084 Australian Army recruits was conducted from January to May 2008. Data were obtained from a clinical dental examination with bitewing radiographs, and a questionnaire elicited socio-demographic data and history on lifetime exposure to fluoridated drinking water.
Results:
Mean DMFT scores were 3.16, 4.08, 5.16 and 7.11 for recruits aged 17-20, 21-25, 26-30 and 31-35 years, respectively. Recruits with a lifetime exposure to fluoridated drinking water had a mean DMFT of 3.02, while recruits with no exposure had a mean DMFT of 3.87.
Conclusions:
Caries experience in Australian Army recruits aged 17-25 years increased between 2002-2003 and 2008. Recruits with lifetime exposure to fluoridated drinking water had 25 per cent less caries experience compared with recruits who had no exposure to fluoridated drinking water after adjusting for the effects of age, gender, education and socio-economic status.
Related Concept Videos
Teeth
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 and...
Tooth Anatomy
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 grinding food.
Development of the Oral Microbiota
Oral Cavity
Teeth: The teeth are the hardest structures in our bodies. Humans have two sets of teeth throughout their lifetime: deciduous (baby) teeth and permanent teeth. Each tooth consists of several parts: the crown (visible part), the root (embedded in the jaw), enamel (hard outer...
Cognitive Dissonance
The Oral Microbiota