Sample size (n) and mean age (years) in the Arara-Laranjal and Arara-Iriri villages.

<p>Sample size (n) and mean age (years) in the Arara-Laranjal and Arara-Iriri villages.</p

Dentition features in the Arara-Iriri and Arara-Laranjal groups for deciduous, mixed and permanent dentition.

<p>PR = Prevalence Ratio.</p>∞<p>PR Not computed (zero)/p-value for NA = Not available (ns) = not significant;</p>*<p>P<.05;</p>**<p>P<.01;</p>***<p>P<.001.</p

Descriptive statistics for tooth wear in the upper and lower jaw.

<p>Median (−), minimum and maximum values for the Arara-Laranjal (left side, n = 58) and Arara-Iriri (right side, n = 23) populations. P values were obtained using a Mann-Whitney test.</p

Kappa coefficient for diagnostic method.

<p>Kappa coefficient for diagnostic method.</p

Dental occlusion in a split Amazon indigenous population.

<p><b>A</b>) Normal occlusion as observed in a male individual from the Arara-Laranjal village. The lines indicate the upper canine tip occluding between the lower canine and lower 1^st premolar. <b>B</b>) Class III malocclusion associated with anterior and posterior crossbite in a male from the Arara-Iriri village. The lines indicate a misaligned upper canine tip occluding posterior to the lower canine and lower 1^st premolar.</p

95% prediction interval for indigenous and urban population.

<p>95% prediction interval for indigenous and urban population.</p

A single model including all 3 populations (Assurini + Xicrin-Kaiapó + Arara).

<p>A single model including all 3 populations (Assurini + Xicrin-Kaiapó + Arara).</p

The modified tooth wear examination.

<p>The index of occlusal wear for a 48-year- old indigenous person.</p