Exam 2: Occlusion Exam and Eval Flashcards
What is malocclusion?
A CONDITION IN WHICH THERE IS A DEFLECTION FROM THE NORMAL RELATION OF THE TEETH TO OTHER TEETH IN THE SAME ARCH AND/OR TO TEETH IN THE OPPOSING ARCH
What are the angle’s classifications?
Based on the relationship of the MB cusp of the MAXILLARY 1st molar & the BUCCAL groove of MANDIBULAR 1st molar
What class has the MB cusp of max 1st molar bisects buccal groove of mand 1st molar?
Angle’s Class I
What is the definition of class I malocclusion?
SAME AS NORMAL OCCLUSION BUT CHARACTERIZED BY CROWDING, ROTATIONS, AND OTHER POSITIONAL IRREGULARITIES.
What class has MB cusp of max 1st molar is mesial to mand 1st molar’s buccal groove?
Angle’s Class II
What class is known as an overbite?
Angle’s Class II
What class is MB cusp of max. 1st molar is distal to buccal groove of mand 1st molar?
Angle’s Class III
What class is known as an underbite?
Angle’s Class III
What Angle class is this?
Angle’s Class III
What Angle class is this?
Angle’s Class I with severe crowding
What Angle class is this?
Angle’s Class II
What is overjet?
THE HORIZONTAL OVERLAP OF THE MAXILLARY CENTRAL INCISORS OVER THE MANDIBULAR CENTRAL INCISORS
What do you measure overjet with?
periodontal probe
What is the average mm of overjet?
2-3 mm
What is overbite?
THE VERTICAL OVERLAP OF THE MAXILLARY CENTRAL INCISORS OVER THE MANDIBULAR CENTRAL INCISORS.
What is the normal amount of overbite?
2-3 mm
20-30% of the height of the mandibular incisors
What is an anterior crossbite?
The horizontal growth of the mandible exceeds the horizontal development of the maxilla, and the lower anterior teeth end up in front of the upper anterior teeth.
What type of bite does this show?
anterior crossbite
What type of bite does this show?
Posterior crossbite
What type of bite does this show?
posterior crossbite
The etiology of dental wear is…
multifactorial with complex relationships between attrition, abfraction, abrasion and erosion
True or False: dental wear is part of the normal cycle of the dentition.
True
What are the categories of erosive tooth wear (ETW)?
Erosion
Abfraction
Abrasion
Attrition
- classified according to the specific mechanism that is responsible for the wear
What is evidence of bruxism?
Bony ridges-exostosis, tori
Gingival recession
Abfractions- loss of cervical area due to bruxism
Broken teeth & restorations
Excessive attrition
What is evidence of occlusal wear/trauma?
- wear facets
- broken restorations
- chipped teeth
What is attrition?
Mechanical wear of the incisal or occlusal surface as a result of functional or para-functional movements of the mandible (tooth-to-tooth contact).
What are the facts about attrition?
- bruxism accelerates
- can be age related
- occlusal surfaces match jaw movements and usually have similar degree of wear
What condition is this?
bruxism (abfraction)
What does this show?
occlusal wear/trauma
What erosive tooth wear (ETW) is this?
attrition
What erosive tooth wear (ETW) is this?
attrition
What is abfraction?
A form of wear along the gingival margin that is not caused by acid activity
What does abfraction look like?
- cervical wedge shaped defects
What can cause abfraction?
bruxism
What erosive tooth wear (ETW) is this?
abfraction
What erosive tooth wear (ETW) is this?
abfraction
What erosive tooth wear (ETW) is this?
abfraction
What is abrasion?
Abnormal tooth surface loss resulting from direct frictional forces between the teeth and external objects or from frictional forces between contacting teeth in the presence of an abrasive medium.
What can cause abrasion?
- Improper brushing techniques; most common and usually seen as a sharp, V-shaped notch in the gingival 1/3 of the tooth.
- Habits
- Vigorous use of toothpicks between adject teeth.
What most likely causes interproximal abrasion?
toothpicks
What most likely causes incisal notching abrasion?
nails
pipe
What most likely causes cervical abrasion?
toothbrushing
What erosive tooth wear (ETW) is this?
abrasion
What is erosion?
Wear or loss of tooth structure by chemicomechanical action.
What would cause erosion of facial surface of teeth?
lemons
acidic liquids
What would cause erosion of lingual surface of teeth?
bulimia
What does bulimia cause to teeth?
Thinning, chipping of incisal edges
anterior open bite
loss of vertical dimension
“raised” amalgams
thermal sensitivity
