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The Heredity of Cephalogram’s Landmark Position in Javanese Population


Goenawan Brotosaputro, Agus Harjoko, Suharto, Munakhir Mudjosemedi, Cendrawasih Andusyana Farmasyanti


Vol. 18  No. 4  pp. 13-19


The heredity of children’s physical characteristics from parents has been well documented, while the heredity of cephalogram’s position of Javanese population from a generation to the next has not been yet studied. This research was conducted on 129 cephalograms from 43 families of Javanese population consisting of father, mother, and one biological child. Based on five cephalogram landmarks: Nasion, Orbitale, PointA, Sella, and Porion, a triangle was formed to find the measure of each angle subsequently. The triangle similarity theory is used to compare each angle of a child's triangle with its parent with a standard deviation threshold of 129 cephalograms for each angle. The children triangle could be said similar to the parent's triangle if the margin of each angle is smaller or equal to the standard deviation. The results showed that only one child had ten similar triangles to the parents, as much as 28 families had 5 or more similar triangles to the parents, and the rest had less than five similar triangles. In other words, out of 43 families, 29 families (67%) with 5 or more triangles were similar to their parents' triangles. The comparison also conducted to the parent triangles of 43 families with the children triangle to obtain inconsistency number. In average, 19 triangles (45%) of 43 children are not similar to the parent triangles. From these results, it could be concluded that the comparison of each family and cross-family had 67% and 55% similarity respectively. These results were obtained due to Javanese people had similar physical characteristics. Thus further research was needed by comparing with other ethnic group populations.


heredity cephalogram landmark triangle similarity Javanese population.