2. Definition
1. According to Angle class III molar
relationship refers to:
condition where the mesio-buccal
cusp of permanent maxillary first
molar occluding in the interdental
space between the mandibular first
and second molars.
3. Definition
2. According to British standards definition
of class III incisor relationship refers to:
lower incisor edge occludes anterior to
the cingulum plateau of the upper
incisors.
4. Etiology
Heredity
Age linked
Functional factor and soft tissue
- tongue posture
- enlarged tonsils and naso-respiratory
difficulties.
- excessive epi pharyngeal lymphoid
tissue
occlusal forces created by abnormal eruption.
premature loss of deciduous molars.
lack of eruption of maxillary buccal segments.
cleft lip and palate.
compulsive habits of protruding the mandible.
trauma to the mid face during growth phase.
5. A 25 y/o female patient with c/o of an unesthetic
facial and dental appearance
Lateral view of the patient’s face shows prominent
lower jaw with the concave profile. Intra orally the
molars, canine and incisor relationship is class III
with a reverse overjet of 5mm. Mild crowding of
upper and lower anterior teeth is present.
6. Skeletal malocclusion
Discrepancy in shape, size or position of one or both
jaws
Dental malocclusion
Discrepancy in shape, size or position of tooth.
8. Intraoral
1. Reverse overjet
2. Unilateral or bilateral posterior
crossbite (due to constricted
maxillary or more forward
positioned mandible)
3. Class III molar and canine
relationship
