Abstract
The problem, which dentition the molar teeth belong to, have been studied by many authors without any definite solution. Having found some defects in previous reports, I adopted a new method in research and confirmed the fact that pig's molar teeth develop from the deciduous dental lamina.Fetuses and newly born pigs were used as materials for my research work. I observed care-fully the specimens which unfixed materials were dissected so as to leave the epithelial part only, serial sections and some reconstruction models.By the experimental research, I obtained the result that dental lamina, which had developed the deciduous molar teeth, extended backward connecting with the oral epithelium and then developed into the molar teeth in the same process the other deciduous molar teeth had developed.
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