Vu Orthodontics - Orthodontist - Braces  & Invisalign

In this section, some examples of "underbite" are presented.  Laypersons often use the word underbite to describe this condition, but the correct terminology is actually negative overjet or anterior cross-bite. Technically, dentists diagnose this problem as Class III malocclusion (based on the relationship between the upper and lower 1st molars) or skeletal Class III (based on the relationship between the alveolar bones associated with the upper and lower anterior teeth).  The problem could be dental or skeletal or both.  For moderate or severe Class III malocclusion (dental only), extraction of is usually needed.  Note that premolars are also called bicuspids by some people but this usage is incorrect.  For moderate or severe skeletal Class III, orthognathic surgery is often indicated as an option, but this treatment option is only appropriate for adults or young adults whose growth is essentially stopped.

Kids and Teenagers

Case 1: 8 yr-old female (without extraction)

Fig. 1 View showing ovejet (initial)

Fig. 2 View showing progress (6 months)

Case 2: 11 yr-old female (without extraction)

Fig. 3 View showing ovejet (initial)

Fig. 4  View showing progress (2 months)

Case 3: 12 yr-old female (without extraction)

Fig. 5 View showing overjet and UL canine (initial)

Fig. 6  View showing progress (11 months)

Adults

Case 4: 21 yr-old male

This case is skeletal Class III (moderate, with Class III malocclusion, with molars not shown); treated without orthognathic surgery and without extraction.  Patient wanted no orthognathic surgery.

Fig. 7  View showing ovejet (initial) 
Fig. 8  View showing progress (9 months)