Shahid, Fazal
(2015)
Determination of tooth size and arch dimension in a pakistani population: a novel approach utilizing digital
model.
Masters thesis, Universiti Sains Malaysia.
Abstract
The prime aim of this thesis is to develop the norms for tooth size, tooth size ratio
(Bolton index), arch dimension, arch length and arch perimeter on subjects of
Angle‘s class I (normal) occlusion in Pakistani population. This thesis describes the
validity and reliability of digital model measurements, geomorphometrics norms of
tooth size and arch dimension analysis by conventional digital caliper and digital
stereomicroscope, measurement for Bolton‘ tooth size ratio (intermaxillary tooth size
discrepancy) investigation, tooth size and intermaxillary tooth size discrepancy via
circumferential tooth size measurements.
In order to establish standard norms for the Pakistani population, we investigated the
tooth size and arch dimension using conventional digital caliper (DC) and digital
stereomicroscope (SM). The sample consisted of 128 subjects ranging in age from 18
to 24 years. Dental models of each subject for maxillary and mandibular arches were
scanned via Hirox digital stereomicroscope for the fabrication of the digital models,
and the tooth size and arch dimensions were measured via SM scanned digital
models. Sex differences were assessed, and interrelationships between different
variables were explored within the study group. For the data obtained by SM
techniques, the men had statistically significant larger arch dimensions and
geomorphometrics norms of tooth size than the women (p<0.05).
For the Bolton‘ tooth size ratio (intermaxillary tooth size discrepancy), the sum of
anterior tooth size and overall tooth size via SM methods showed statistically
significant result in relation sexual disparities (p<0.05). No significant sexual
disparities for Bolton‘s anterior ratios (BAR) and Bolton‘s overall ratios (BOR) were
observed.
This study has established a new reference database of tooth size and arch
dimensions via SM for first time on Pakistani population. These norms for tooth size
and tooth size ratio will be helpful for clinical treatment planning in dentistry and
forensic dentistry.
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