Tooth size and arch dimensions in a hypodontia patient group

Higgins, Shane Anthony (2017). Tooth size and arch dimensions in a hypodontia patient group. University of Birmingham. M.Sc.

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Abstract

Aim
To compare the tooth size and arch dimensions of subjects with hypodontia to a nonhypodontia control group and to establish if there are racial differences between White British and South Asian subjects.
Methods
Mesio-distal tooth size and arch dimensions of 186 hypodontia subjects and 62 control subjects were measured. Thirty-one subjects per hypodontia category (mild, moderate, severe) were analysed for each racial group (White British and South Asian) and compared to 31 non-hypodontia control subjects. Mesio-distal tooth size was measured using a Mitutoyo™ digital calliper accurate to 0.01mm. Arch dimensions (intercanine width, intermolar width and arch length) were measured using the ArchMaker 1.1 software program.
Results
Multiple linear regression showed that mean standardised tooth size was 0.69 standard deviations lower in mild hypodontia subjects compared to the control group (C.I. -0.89, -0.49, p<0.001). Moderate hypodontia subjects were 1.01 standard deviations smaller (C.I. -1.20, - 0.81, p<0.001) and severe subjects were 1.59 standard deviations smaller (C.I. -1.79, -1.40, p<0.001), respectively. There were no statistically significant differences in tooth size between White British and South Asian subjects (p=0.165). Racial group did not influence the effect of hypodontia on tooth size (p=0.206). Large individual variation in arch dimensions was observed in hypodontia subjects with an overall tendency for reduced dimensions. No significant differences in arch dimensions existed between White British and South Asian subjects and racial group did not influence the effect of hypodontia on arch dimensions.
Conclusion
Tooth size and arch dimensions are reduced in hypodontia patients with no racial differences between White British and South Asian subjects. The results of this study emphasise the complexity of treating this condition. These factors should be carefully considered in the treatment planning process to ensure an optimal outcome for the patient.

Type of Work:

Thesis (Masters by Research > M.Sc.)

Award Type:

Masters by Research > M.Sc.

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