Issue: Vojnosanit Pregl 2017; Vol. 74 (No. 12)
Analysis of occlusal characteristics of identical homozygous twins
Authors:
Esad Kučević, Jasna Pavlović, Srdjan D. Poštić, Tatjana Čutović, Jelena Todić
Background/Aim. Functionally stable occlusion is characterizedby optimal and orthopedic stable position of the condyle,
harmonious contact ratio of upper and lower teeth in the final
occlusal position of the mandible, optimal relationship of dental
arches at the eccentric movement of the lower jaw and stable
interocclusal space in physiological position. As there are no
ideal order of teeth and absolute intermaxilar harmony nor individually
acceptable standards or prototype of functionally optimal
occlusion, the aim of this study was to analyze occlusal
characteristics of identical twins. Methods. This clinicalepidemiological
and functional study involved 30 pairs of identical
twins, both males and females, aged 20 to 40 years. The
main criterion for the selection of participants was preserved
function of orofacial system, as a precondition for application
of the Peer Assessment Rating (PAR) index, which is the most
reliable tool for diagnosing malocclusion and evaluating occlusal
parameters: the distance between the contact points of agonists
of front segments of the dental arches, side occlusion of
the sagittal, vertical and transversal position, overjet, anterior
crossbite, deep and open bite, overbite of incisors and relationship
of middle dental arches. Results. Using t-test for independent
samples, no significant difference in the values of PAR
index, according to gender, was established. The average difference
of 0.833 between the twin groups (for male twins: ґ =
7.97, SD = 6.625; for female twins: ґ = 7.13, SD = 5.606) was
not statistically significant [t (58) = 0.526; p = 0.601; 95% confidence
interval: -2.339–4.005]. Conclusion. The lack of significant
differences in occlusal PAR index analysis in both the
same and different twin groups, implies the dominance of hereditary
factors.
