The etiology of osseous deformities of the head, face, jaws and teeth . Fig. Fig. ixi. When the diameter of the upper arch is greater than that ofthe lower, its laterals may be found within the line of thecentrals and cuspids. In this case the lower incisors musteither strike over the upper, which occurs when there is aproper relation of diameters of upper and lower maxillae, orelse they may strike behind the upper laterals, which canoccur only when the upper arch has a greater diameter thanthe lower. THE HEAD, FACE, JAWS AND TEETH 441 6. A rotation of 90°, so that the lateral is at rio^
The etiology of osseous deformities of the head, face, jaws and teeth . Fig. Fig. ixi. When the diameter of the upper arch is greater than that ofthe lower, its laterals may be found within the line of thecentrals and cuspids. In this case the lower incisors musteither strike over the upper, which occurs when there is aproper relation of diameters of upper and lower maxillae, orelse they may strike behind the upper laterals, which canoccur only when the upper arch has a greater diameter thanthe lower. THE HEAD, FACE, JAWS AND TEETH 441 6. A rotation of 90°, so that the lateral is at rio^ht angleswith a line passing through centrals and cuspids, can occuronly when there is no obstruction to the movement of eitherroot or cutting-edge and where there is no proper occlusion.(Fig. 188.) 7. Occasionally a lateral is found wholly inside of thearch. The cause is twofold. Sometimes the lateral iserupted so tardily that the cuspid pushes it out of its , again, even though it is erupted, in due time thegreater relative (Fig. 189) size and strength of the cuspi
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjecthead, bookyear1894
