In the field of orthodontics, maxillary expansion appliances tend to adapt and expand the maxillary arch in our mouth. The rationale that lies behind this is that the force which is exerted by the appliance inserted in our mouth, a heavy force, is going to ensure the mechanical separation of the different segments in our mouth.

The maxillary expansion appliances tend to produce orthopedic as well as orthodontic results of such a nature that they help tip the posterior teeth in our mouth and enable lateral forms of rotations in the segments. In other words, the maxillary expansion appliance tends to cause downward rotation and the backward rotation is such a way that it helps increase the facial height.

The maxillary expansion appliance was first described by Emerson Angell in the 1860’s and according to him the main aim of such a device was to increase the narrowness in our body, especially dental aesthetics. The underlying and fundamental concept behind the expansion appliance being that the movement of the skeletal system could bring about such changes and not dental aesthetics.
The appliance is inserted into our mouth and tends to put rapid and heavy forces to the post teeth. These forces, if exceed limit can open up the teeth and they would be moving in a way that would support the dental bone structure.

The maxillary expansion appliance is of two kinds:

●Banded appliance
●Bonded appliance.

The banded appliance is directly attached to the teeth, specifically the first molars and the first premolars. There is no form of palatal coverage and are therefore a hygienic option. The banded appliance can be further divided into two categories- the teeth borne and the teeth and tissue borne. Whereas, the bonded appliance is constructed with the help of acrylic cappings, which are then placed over the posterior segments in our mouth and are later bonded to them directly.

The maxillary expansion to be chosen for a person will be greatly influenced by the kind of dental- skeletal system a person possesses. This is going to in-turn influence the kind of the results a person would get, in the end.

The tooth and tissue bore expansion appliance, i.e. the Banded ones are going to help in a less relapse and enhanced levels of expansion. The results would be in the form of a great nasal cavity along with an enhanced base of mouth. Overall, this helps in the better mobility of maxilla and not just the teeth.
The bonded expansion appliance tend to be cemented in our mouth when other maxillary appliances do not work. The posterior teeth tipping would be reduced, along with providing benefits to the people who suffer from cross biting.