occlusal examination Flashcards
condition in which there is DEFLECTION from normal relation of teeth to other teeth in same arch or opposing arch
malocclusion
angles classification is based on the relation of
the MB cusp of maxillary 1st molar and buccal groove of mandibular 1st molar
angle’s class 1
MB cusp of max fist molar bisects buccal groove of mand 1st molar
same as normal occlusion but characterized by crowding, rotations, and other positional irregularities
class I malocculsion
angles class II
MB cusp of max 1st molar is MESIAL to mand 1st molars bucca groove
angle class II is also known as an
overbite
angles class III
MB cusp of max 1st molar is DISTAL to buccal groove of mandibular 1st molar
angles class III is also known as
underbite
class III malocclusion
max 1st molar MB cusp is distal to buccal groove of mand 1st molar
HORIZONTAL overlap of maxillary central incisors over the mand central incisors
overjet
mm of overjet normally
2-3 mm
VERTICAL overlap of max central incisors over the mand central incisors
overbite
how much of max teeth cover up mand teeth
overbite
vertical overlap
normal overbite
2-3
2-30% of height of mand incisors
horizontal growth of mand EXCEEDS horizontal development of maxillar, and lower anterior teeth end up in front of upper anterior teeth
can also result from underdevelopment of maxilla
anterior crossbite
part of the normal cycle of dentition but excessive wear and tooth loss leads to variety of changes within the oral cavity
dental wear
etiology of this is multifactoral with complex relationships between
dental wear:
attrition, abfraction, abrasion, erosion
this is classified to the specific mechanism that is respond for the wear:
erosive tooth wear (ETW)
erosion (only one that is chemical)
abfraction
abrasion
attrition
bony ridges-exostosis, tori
gingival recession
abfractions
broken teeth and restorations
excessive attrition
evidence of bruxism
loss of cervical area due to bruxism
abfractions
bony ridges
exostosis, tori
wear facets
broken restorations
chipped teeth
evidence of occlusal wear/trauma
mechanical wear of the incisal or occlusal surface as a result of functional or para-functional movements of mand (tooth-to-tooth contact)
attrition
bruxism accelerates
can be age related
occlusal surfaces match jaw movements and usually have similar degree of wear
form of wear along gingival margin that is NOT caused by acid activity
abfraction
