By Declan Millett BDSc DDS FDS(RCPSGlasg) DOrthRCS(Eng) MOrthRCS(Eng), Richard Welbury MB BS BDS PhD FDSRCS
(Churchill Livingstone) Univ. of Glasgow, united kingdom. Pocket-sized advisor for these getting ready for checks. Concise textual content is built-in with high quality, colour scientific images. makes use of an new angle that enables overview of a big variety of instances. Softcover.
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Additional info for Orthodontics and paediatric dentistry
75). Adams clasp. Recommended anteriorly with 'u' l oop engaging the undercut between incisors (Fig. 74). Southend clasp. 8 mm if it includes reverse loops). This is useful in preventing buccal drifting of teeth during mesial or distal movement ( Fig. 71; p. 58); it can also be fitted to the teeth as a retainer. Long labial bow. Baseplate This is usually made of cold-cured acrylic but may be heat-cured. It connects the other components; guards palatal springs; aids anchorage by contact with the palate and with teeth intended not to move; and transfers active component forces to the anchorage.
Aetiology Skeletal pattern. Usually Class III associated with a l ong mandible, forward placement of the glenoid fossa positioning the mandible more anteriorly ( Fig. 58), short and/or retrognathic maxilla, short anterior cranial base or a combination of these ( Fig. 59); it may be Class I with Class III incisor relationship due to incisor position or inclination. FMPA may be reduced/average/increased. There is commonly a transverse discrepancy with a narrow maxillary and a wider mandibular base but worsened by a Class III skeletal pattern.
Some guidelines, however, are given below: • Institute preventive measures. • Assess the patient's motivation for orthodontic treatment and level of dental awareness. • Ensure that all permanent teeth, particularly 5s, 8s, present radiographically and all others are of good prognosis. • Avoid extraction of FPM in a quadrant with an absent tooth, or in uncrowded arches. • Consider balancing or compensating for extraction of a FPM (Figs 33 & 34). • Timing of extraction of 6: this is best when the bifurcation of 7s i s calcifying (Fig.