BAB I INTRODUCTION
Tooth is part of the body that is very resistant to mutilation process of nature, either in physical and also chemical Mokhtar, 1982; Ardan 1997. The most
found part from the body of the Homo fossil is the tooth. As adjustment to the environment changes, for example function and culture
during evolution process, tooth change its form. In pre-historic men, function of mastication was very hard because harsh type of food. Finding of fire and another
food processing, food type become more soft and cut in small pieces. Tooth form change, for example groove pattern at occlusal surface of molar. Form of tooth
morphology is created in such a manner to fulfill its function Harsanur, 1991. Change of gene in a population, happened during the time, alighted from one
generations to the next generation called as evolution Wolpoff, 1980 Function of anterior teeth is to cut the food, and posterior teeth especially
molar is to refine food before its swallowed. To refine the food, surface of tooth should be more wide. The function of groove at the occlusal surface is as a food
channel towards external without accentual irritation to the ginggiva margin. Base pattern of molar before evolution of hominid is 5 bulge and fisur
connecting it. This pattern is primitive molar tooth pattern. Gregory and Helman called it ” Dryopithecus Pattern” or form ” Y5”. Along with run of evolution, various
1
other pattern are: +5; Y4; +4; and Y3 pattern Anderson, 1962. This functional change is more to the more posteriordistaltooth.
This study was done on the lower jaw because the more change form of bulge and groove pattern are in lower jaw molar von Koenigswald, 1958, and because a
lot of hominid fossils collection for this study are collection of Centre Of Research And Development of Geology Bandung PPPG are mandible specimen Aziz,
2001.
BAB II MATERIAL AND METHOD
Kategori