Australasian Dentist Issue 92

CATEGORY AUSTRALASIAN DENTIST 49 LINICAL The implants and the new bicortical titanium screws are so convenient to place that the line of action of the orthodontic force can be made to coincide with the level of the center of resistance of the teeth to be moved resulting in a favorable translatory tooth movement. The implant-assisted orthodontic treatment helps to minimize anchorage loss and decrease the overall duration of treatment, as these can be loaded immediately. The following tooth movements are performed with the skeletal anchorage devices: u Molar uprighting/protraction u Molar intrusion/extrusion u Molar distalization/mesialization u Up-righting and extrusion of impacted molars u Premolar intrusion/extrusion u Premolar distal movement in the case of missing molars u Dental midline correction u Incisor retraction and proclination u Incisor intrusion/ extrusion u Extrusion of single tooth u Arch expansion/constriction u Cross-bite correction u Correction of deep bite/open bite u Extraction space closure u Canted occlusal planes correction u Impacted canine alignment u En-masse retraction of anterior teeth u Correction of mild vertical skeletal discrepancies u En-masse movement of the whole arch in mild skeletal cases. Clinical Application in Maxillary arch Infrazygomatic crest area u To retract the entire maxillary arch to correct class II canine and molar relation u Intrusion of maxillary molars along with palatal micro implants. Maxillary tuberosity area u Retracting the maxillary posterior teeth u En-masse retraction the maxillary arch Fig 8a Intrusion of posteriors Fig 8b Retraction of anteriors/en-masse Fig 9 Zygomatic process Fig 10 Retracting the maxillary posterior teeth Fig 11 En-masse retraction of the maxillary arch Maxillary posterior interdental regions u Retracting anterior teeth in extraction cases u Intrusion of maxillary molars / premolars Fig 12a Between 1st and 2nd molar Fig 12b Mesiobuccal roots of the maxillary first molar roots are curved mesially. To avoid root injury, the implant should be drilled mesial to the contact point between the 2nd premolar and 1st molar Fig 13a Indirect anchorage between maxillary canine and 1st premolar to distalize molars Fig13b Intrusion of maxillary buccal segments 1 Fig13c Intrusion of maxillary buccal segments 2