Indications for Maxillary Expansion

The correction of transverse maxillary deficiency can be an important component of an orthodontic treatment plan. A number of different techniques are available for the correction of such discrepancies. The aim of this article is to review the methods available to clinicians discussing their indications, advantages and disadvantages. Dent Update 2004; 31: 516–523 Clinical Relevance: The correction of transverse maxillary deficiency is a common problem faced by those carrying out orthodontic treatment. O R T H O D O N T I C S he correction of transverse maxillary deficiency can be an important component of an orthodontic treatment plan. Implant studies have shown that growth of the mid-palatal suture is the most important factor determining the width of the maxilla. Growth is normally complete by the age of 17 years and the mean transverse growth between the age of four years and adulthood is 6.9 mm. As such a small amount of growth occurs in the transverse dimension of the maxilla throughout life, it is unlikely that a crossbite encountered in the permanent dentition will self correct. However, a number of orthodontic techniques exist to expand the maxillary arch. It is the aim of this article to review the techniques for maxillary expansion. INDICATIONS FOR MAXILLARY EXPANSION The clinical situations in which maxillary expansion should be considered are: Crossbites; Distal molar movement; Functional appliance treatment; Surgical cases (arch co-ordination/ bone grafts); To aid maxillary protraction; Mild crowding.