A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . ilateral maleruptioh of cuspidsType C: bilateral malerxtption of cuspids m class iiType D: protrusion of upper front teeth Type E : RETRUSION of upper front teeth (See Division 2. Class III) Type F: lateral malocclusionType G: open-bite malocclusion DIVISION 2: BIMAXILLARY PROTRUSION AND RETRUSION CLASS I CHAPTER XXII PRINCIPLES OF DIAGNOSIS IN MALERUPTION OF THE CUSPIDS Diagnosis.—The most frequent dento-facial irregularity of the teeth is thatwhich is characterized by a Maleru
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . ilateral maleruptioh of cuspidsType C: bilateral malerxtption of cuspids m class iiType D: protrusion of upper front teeth Type E : RETRUSION of upper front teeth (See Division 2. Class III) Type F: lateral malocclusionType G: open-bite malocclusion DIVISION 2: BIMAXILLARY PROTRUSION AND RETRUSION CLASS I CHAPTER XXII PRINCIPLES OF DIAGNOSIS IN MALERUPTION OF THE CUSPIDS Diagnosis.—The most frequent dento-facial irregularity of the teeth is thatwhich is characterized by a Maleruption of the Cuspids; and since it arises fromvarious local causes, it will be found in connection with every disto-mesial mal-relation of the buccal teeth. In other words, it will be found at times characteriz-ing every one of the three Classes of Malocclusion. It arises far more frequentlyin Class I—as in all locally caused malocclusions—because in inherited normalocclusions of the teeth, there is a far larger field for local causes to attack than ininherited malocclusions of the buccal teeth. Fig. The most common characteristic is that of a labial maleruption of the uppercuspids, and occasionally upon one side alone, as shown in Fig. 129. While thiscondition will frequently be found with both the upper and lower dentures, it farmore commonly occurs with the uppers alone. If in these cases it is accompaniedwith an irregularity of the lower, it will usually be a malalignment of the incisorswith the cuspids more or less prominent, though fully erupted. The reason for themore frequent maleruption of the upper cuspids as compared to the lower, is partlydue to the earlier eruption of the lower cuspids, which permits them to take their 200 CHAPTER XXII. DIVrsiON 1. CLASS I. 201 positions before the loss of the deciduous molars, and the eruption of the is also due to the fact that the temptation to prematurely extract the lowerdecidvious cuspids to correct a
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