+a;a;e;-+.&07c;+�d;b;-&+'-".7c;"b;7+f;e;'70�a;a;+.!-".7 Fabrication of the Haas appliance as it is designed is critical (Fig. 5). Fitting of orthodontic bands to the 6 year molars, is preceded by two days of elastic separa-tion mesial and distal. This allows for easy and comfort-able fitting of the molar bands and the impression. We use a band that has our Roth prescription bracket, so we can move into the straight wire treatment without removing the appliance. The bands are reseated in the alginate impression, which is poured in dental stone after the bracket slot/tube is carefully sealed with wax. This is sent to any good orthodontic lab and the Haas appliance is prescribed with a 28 or 36 mm. jackscrew. A scalloped 036 wire emerges from the solder joints forward to the cuspids and is reimbedded in the palatal resin. The wire also exits the molar band solder joint distally and is locked into the resin As in the photo-graph (Fig.6a), care is taken to cover the alveolar segments of the palate with resin without impinging on the free gingival margin. These resin pads are critical to the stability, efficiency, and force distribution of this appliance and must be constructed as pictured. Another key feature of the appliance is the 2mm of relief of the resin on the palatal side for a width of 3mm on either Fig. 7 Fig. 5 as meaning two weeks weeks. For the beautiful palatal form and facial harmony that we are achieving routinely in 50 year olds, I do not believe 12 to 15 weeks of active turning of a jackscrew is slow (schedule of turning to follow). Especially if it eliminates the morbidity of the surgical alternative. Fig. 6a f;4$$6*62575 *242d;71(%6) ,61713673##,432(6 Over 20 2 turns/week 24-36 turns Maxilla rotates at the sutures Opening completed 14-18 weeks Palate flattens and widens Fig. 6b 18 Winter 2014 JAOS Under 20 2 turns /day 24-36 turns Maxilla sepa rates at mid-palatal suture Opening completed 14-18 days Palate flattens and widens Fig. 8
Journal of the American Orthodontic Society Winter 2014: Page 18
