<unk>  is an occlusal irregular condition where a lower tooth has a more buccal position than the antagonist upper tooth.<unk>  can involve a single tooth or a group of teeth.<unk>  can be classified as anterior or posterior.
Anterior<unk>  can also be referred as negative overjet, and is typical of class III skeletal relations (Progenism).
Posterior<unk>  is often correlated to a narrow maxilla and upper dental arch. A posterior<unk>  can be unilateral or bilateral.
Unilateral<unk>  often determines a lateral shift of the mandibular position, which can become structural if left untreated for a long time during growth, leading to skeletal asymmetries.
Crossbite
Frostbite
Abrasion 
Abrasion
Bandage
Cramp
LeFort fracture
Nasal fracture