By T. D. Foster
This textbook provides an figuring out of the history of scientific orthodontics, yet as a lot of scientific orthodontics should be discovered within the sanatorium, the ebook emphasises equipment layout seeing that this is studied at the revealed web page. Divided widely into 3 components the publication first covers the rules of enamel circulation and remedy making plans together with extractions. the ultimate chapters clarify the mechanisms of detachable, fastened and practical equipment treatment together with the remedy of the most classifications of malocclusion
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Extra resources for A Textbook of Orthodontics
Fig. 4 shows a gross example of translocated closure of the mandible. Although translocated closure is brought about by premature contact of teeth in closure of the mandible, there appears to be a reflex protective mechanism which guides the mandible away from the premature contact before maximum force, or perhaps before any force, is exerted on the teeth in premature contact. 30 CHAPTER 2 Fig. 4. Translocated closure of the mandible, (a) Initial contact of teeth on the left side of the jaws, (b) Movement of the mandible to the right to achieve maximum occlusion of the teeth.
CLASS 2. Lower dental arch in posterior relation to upper arch. Division 1. Upper central incisors proclined, increased incisal overjet. Division 2. Upper central incisors retroclined, increased incisal overbite. 43 THE OCCLUSION OF THE TEETH CLASS 3. Lower dental arch in anterior relation to upper arch. Postural Class 3. Translocated forward closure of the mandible into Class 3 relationship. In any of these types of occlusion there may be lateral or vertical discrepancies in dental arch relation, or crowding or irregularity of the teeth.
28 CHAPTER 2 1 Retruded contact position (centric relation) The terminal position of the automatic path of mandibular movement from rest to occlusion which has not been deviated by tooth contact or abnormal muscle action. The mandibular condyles are normally in their most posterior position in the condylar fossae, though not forcefully retruded. 2 Inter cusp al position (centric occlusion) The position of maximum intercuspation of the upper and lower teeth. This definition cannot be applied to every individual, because in some circumstances, as in the later stages of the primary dentition, attrition has reduced the cusps of the teeth so that the occlusal surfaces are relatively flat.
A Textbook of Orthodontics by T. D. Foster