. Injuries and diseases of the jaws : the Jacksonian prize essay of the Royal College of Surgeons of England, 1867. vol. viii., a case of deformity of the jaw de-pendent upon enlargement of the tongue in which he con-sidered that a partial dislocation of the jaw was produced,and where benefit was derived from the use of an elasticsupport. 430 DEFORMITIES OF THE JAWS. The influence of the habit of sucking the thumb uponthe position of the front teeth is generally acknowledged,and the practice if persisted in, may produce very con-siderable deformity of the jaws. Some drawings illustratinga pape
. Injuries and diseases of the jaws : the Jacksonian prize essay of the Royal College of Surgeons of England, 1867. vol. viii., a case of deformity of the jaw de-pendent upon enlargement of the tongue in which he con-sidered that a partial dislocation of the jaw was produced,and where benefit was derived from the use of an elasticsupport. 430 DEFORMITIES OF THE JAWS. The influence of the habit of sucking the thumb uponthe position of the front teeth is generally acknowledged,and the practice if persisted in, may produce very con-siderable deformity of the jaws. Some drawings illustratinga paper on this subject, by Mr. A^asey, in the PathologicalTransactions, vol. vi., show the resulting deformity ex-tremely well. Dr. Thomas Ballard has also called attentionto the deformity resulting from the habit of tongue-sucking, to which he attributes many of the ailmentsof cliildren. The influence of cicatrices outside the mouth in pro-ducing deformity of the jaw by their contraction in earlylife is well ascertained, and every surgeon must have metwith painful examples of the kind. Fig. 201, from Mr. Fig. Tomes work, shows the condition of the lower jaw in ayoung woman twenty-two years of age, her chin havingbeen drawn down towards the sternum by a broad cicatrix,consequent upon a burn received when five years old. In all these cases the deformity partakes of the samecharacter, and if seen early enough is to some extentamenable to treatment. The slighter cases depending uponthumb-sucking are usually treated by the dental surgeon,who in rectifying the position of the teeth necessarily im-proves the condition of the jaw. In the more severe cases,constant support by an elastic band making traction uponthe jaw will be of much service, as in the cases of Dr, DEFORMITIES OF THE JAWS. 431 Humphry and Mr. Chalk. The cases depending upon thecontraction of cicatrices can only be relieved by treatingthe cicatrices, and the pressure of a screw-collar, worn forthe purpose of extending
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