Aesthetic reasons: dental malpositions
Dental crowding cause a more or less embarrassing aesthetic concern. They can also eventually cause periodontal disease (gum disease) by food retention and plaque and scale deposits.
When the upper teeth are placed too much forward with respect to the lower teeth, the lower incisors collide with the retroinciser palatal mucosa (behind the upper teeth). A loosening of the upper anterior teeth can occur, causing bone loss that can cause anterior mobility.
Difficult incision and chewing especially in cases of superior prognathism and significant lower retrognathism
Risk of coronary fracture of upper incisors if they are too far forward after a fall
Risk of installation of maxillofacial bone asymmetry in case of posterior crossbite
Risk of periodontal disease in cases of an openbites
To bring vestibular and palatal impacted canines into place using mini-implants and / or sectional arches
See the following article: Alireza Seyed Movaghar, Benoit Brochery, Reza Movaghar. Side and canine agenesis included. & nbsp; Surgical-orthodontic placement. DENTAL INFORMATION n ° 14 - April 6, 2011.