Tooth size discrepancies and arch parameters among different malocclusions in a Jordanian sample

Area of Science:

• Orthodontics
• Dental Anthropology

Background:

• Understanding variations in dentition and arch dimensions is crucial for diagnosing and treating malocclusions.
• Previous research has indicated gender and ethnic differences in tooth morphology and arch form.

Purpose of the Study:

• To determine mean mesiodistal tooth width, Bolton ratios, arch length, and arch width in different malocclusions within a Jordanian sample.
• To investigate potential correlations between malocclusion types and these dental and archometric parameters.

Main Methods:

• A sample of 140 orthodontic models from Jordanian students (aged 13-15) representing Class I, II (div 1 & 2), and III malocclusions were analyzed.
• Mesiodistal tooth width, arch width, and length were measured; Bolton ratios were calculated.
• Statistical analysis included Student's t-test and analysis of variance to compare groups.

Main Results:

• Females exhibited smaller teeth than males.
• Class III malocclusion showed larger teeth compared to other categories.
• Class II division 1 presented the narrowest maxillary arch; mandibular intercanine width was larger in Class III.
• No significant differences in Bolton ratios were observed across malocclusions.
• Arch length and width varied significantly between different malocclusion groups.

Conclusions:

• Significant differences in tooth size exist between genders and among malocclusion types.
• Arch dimensions (width and length) also demonstrate variations related to malocclusion.
• These findings contribute to understanding population-specific dental morphology for improved orthodontic treatment planning.