I N a paper which I read before the King County Dental Society April 2, 1918, published in the August issue of the JOURN AL of the same year, I took up in a general way some of the most frequent causes of malocclusion, as I observed them in my own practice. The publication of that paper caused some little discussion by men who read it, and to further substantiate some of the conditions which I have mentioned, I am writing this paper, illustrated with a number of malocclusions which I believe present positive etiologic factors that are so clear that they can not be misinterpreted for anything else. Under the head of constitutional conditions, I stated "rickets" was a disease that was very liable to cause malocclusion and which produced typical conditions that could be very easily recognized in most cases. Rickets is a disease which may manifest itself at any time in the life of the individual, the malocdusion will present certain characteristics depending upon what time the child acquires the disease. One of the earliest symptoms of rickets is that the deciduous teeth are lost early and the permanent teeth erupt late. Given such a clinical history in any case, malocclusion is always sure to develop, and when the two conditions go together, complicated by the constitutional disturbance as found in rickets, malocclusion of the most severe type is very liable to occur. With
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