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ARTICLE
Year : 2011  |  Volume : 9  |  Issue : 18  |  Page : 496-500

An analysis of tooth size, arch length and palatal rugae pattern in monozygotic and dizygotic twins - A comparative study


1 PG Student, Dept. of Public Health Dentistry, Ragas Dental College and Hospital, Uthandi, Chennai, India
2 Professor and Head, Dept. of Public Health Dentistry, Ragas Dental College and Hospital, Uthandi, Chennai, India
3 Reader, Dept. of Public Health Dentistry, Ragas Dental College and Hospital, Uthandi, Chennai, India

Correspondence Address:
S Aparna
PG Student, Dept. of Public Health Dentistry, Ragas Dental College and Hospital, Uthandi, Chennai
India
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Source of Support: None, Conflict of Interest: None


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Introduction: A twin is defined as one of two offspring born at the same birth. If a particular traitis correlated highly between monozygotic twins and less correlated between dizygotic twins, then there isa genetic contribution to variation on that particular trait. Aim and Objective: To analyse the tooth size, arch length and palatal rugae pattern in monozygoticand dizygotic twins and to compare these dental traits between the monozygotic co-twins and the dizygoticco-twins. Materials and Methods: The maximum mesiodistal and buccolingual dimensions of the crowns of28 permanent teeth, first incisor through second molar in each quadrant, of 9 pairs of monozygotic twinsand 21 pairs of dizygotic twins were recorded using calipers calibrated to 0.01 mm. The maxillary andmandibular arch length were determined by drawing a line from a point midway to the central incisorsperpendicular to the tangent touching the distal surfaces of the first permanent molars. The method ofrugae identification was based on the classification of Thomas et at (1983). This classification in includesnumber, length, shape and unification of rugae. Results: The monozygotic (MZ) twins showed greater correlation with respect to MesiodistalDimension MD (r = 0.928). Buccolingual Dimension BD (r = 0.904), maxillary arch length (r= 0.744),mandibular arch length (r=0.878), left rugae (r = 0.49) and right rugae (r = 0.592) than the dizygotic (DZ)twins. Conclusion: The remarkable similarity in the tooth size, arch length and palatal rugae pattern ofmonozygotic twins suggests a strong inheritability factor and that these may be useful as additional toolsfor zygosity determination along with other dental traits.


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