Haas Expander is fixed orthodontic appliance used for maxillary expansion.
Chaconas SJ, Caputo AA.
Observation of orthopedic force distribution produced by maxillary orthodontic appliances. (Am J Orthod. 1982 Dec; 82(6): 492-501.)
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Cameron CG, Franchi L, Baccetti T, McNamara JA Jr.
Long-term effects of rapid maxillary expansion: a posteroanterior cephalometric evaluation. (Am J Orthod Dentofacial Orthop. 2002 Feb; 121(2): 129-35; quiz 193.)
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