Application of intraoral scanner to identify monozygotic twins.

ABSTRACT: BACKGROUND:DNA base identification is a proper and high specificity method. However, identification could be challenged in a situation where there is no database or the DNA sequence is almost identical, as in the case of monozygotic (MZ) twins. The aim of this study was to introduce a novel forensic method for distinguishing between almost identical MZ twins by means of an intraoral scanner using the 3D digital pattern of the human palate. METHODS:The palatal area of 64 MZ twins and 33 same-sex dizygotic (DZ) twins (DZSS) and seven opposite-sex dizygotic twins (DZOS) were scanned three times with an intraoral scanner. From the scanned data, an STL file was created and exported into the GOM Inspect® inspection software. All scans within a twin pair were superimposed on each other. The average deviation between scans of the same subject (intra-subject deviation, ISD) and between scans of the two siblings within a twin pair (intra-twin deviation, ITD) was measured. One-sided tolerance interval covering 99% of the population with 99% confidence was calculated for the ISD (upper limit) and the ITD (lower limit). RESULTS:The mean ISD of the palatal scan was 35.3??m?±?0.78??m. The calculated upper tolerance limit was 95??m. The mean ITD of MZ twins (406??m?±?15??m) was significantly (p?

SUBMITTER: Simon B 

PROVIDER: S-EPMC7532102 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature