A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . th no effect upon the disto-mesial relations ofthe buccal teeth, except to narrow the arches. The modus operandi of the cause, its correction, and final treatment of the resultant malocclusion, will be found in the Practical Treatment of Division 1, Class I. Influences of Heredity upon Deciduous Dentures In regard to the malocclusions which arise from heredity, from the simplestto the most pronounced dento-facial deformities, it is somewhat rare that the decid-uous dentures and
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . th no effect upon the disto-mesial relations ofthe buccal teeth, except to narrow the arches. The modus operandi of the cause, its correction, and final treatment of the resultant malocclusion, will be found in the Practical Treatment of Division 1, Class I. Influences of Heredity upon Deciduous Dentures In regard to the malocclusions which arise from heredity, from the simplestto the most pronounced dento-facial deformities, it is somewhat rare that the decid-uous dentures and jaws indicate in an appreciable degree the condition which isdestined to affect the permanent teeth and more mature jaws. This is because inherited physical dental malformationsFig. 1. , ^ , , , . , rarely commence to develop before the beginning of secondary dentition, norare they often sufficiently pronouncedto become apparent before the period ofadolescence. While there are exceptions to thisrule which is illustrated by Fig. 1, show-ing the plaster models of the deciduousand the permanent dentures of a Class. 34 PART 11. ETIOLOGY OF MALOCCLUSION II case at five and eleven years of age, it is nevertheless true that early inter-ference with the temporary dentures, such as expanding the arches, or the disto-mesialshifting of occlusal relations, is rarely advisable, unless one is sure that thethreatened condition has arisen from some definite local cause which the naturalphysiologic processes of nature will not correct. If teeth are prematurely lost,threatening maleruption or crowded malalignments, the areas should be properlyexpanded and retained for the free eruption of the succeeding teeth. But underother circumstances where the erupting permanent teeth do not seem to havesufficient room and are forced into overlapping malalignments—a condition quitecommon with the lower incisors—it should be remembered that this is the onlyway in which nature is enabled to get those larg
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