MALOCCLUSION Flashcards
T/ F
Dr. Angle gave one of the best examples of a hypothesis–his “key to occlusion.”
→ most important teeth are the 1st permanent molars because
they are the most constant in their positions
T
T/ F
Dr. Angle gave one of the best examples of a hypothesis–his “key to occlusion.”
→ specifically upper 1st permanent molars
→ they are the very cornerstones and thus they became basis for
his classification of malocclusion
T
ARCH FORMS
→ narrow
→ parabolic or average
→ wide
vertical relationship of anterior teeth
OVERBITE
incisal edge of maxillary tooth within the incisal third of the facial surface of the mandibular incisor
NORMAL OVERBITE
incisal surfaces occlude
EDGE-TO-EDGE BITE
maxillary anterior teeth are lingual to mandibular anterior teeth
ANTERIOR CROSSBITE
occurs in Angle’s Class III malocclusion
ANTERIOR CROSSBITE
incisal edge of the maxillary tooth is at the level of the cervical third of the facial surface of the mandibular anterior tooth
DEEP (SEVERE) ANTERIOR OVERBITE
→ lack of incisal contact
→ posterior teeth in normal occlusion
OPEN BITE
molars in cusp-to-cusp occlusion as viewed from the facial
END-TO-END BITE
horizontal relationship of anterior teeth
OVERJET
→ maxillary incisors are labial to the mandibular incisors
OVERJET
maxillary incisors are lingual to the mandibular incisors
UNDERJET
only half of the crown is misaligned
CROSSBITE
→ can be an anterior or posterior crossbite
→ can be unilateral or bilateral
CROSSBITE
→ entire crown is malpositioned
BUCCAL SCISSORS CROSSBITE
complete buccalversion
BUCCAL SCISSORS CROSSBITE
entire crown is lingually displaced
LINGUAL SCISSORS CROSSBITE
T/ F
retroclined is the opposite of proclined incisors
T
T/ F
in cases of a missing tooth, look at the 2nd molar relationships
or canines to classify a malocclusion
T
→ curve formed by buccal cusps of mandibular posterior teeth and incisal edges of mandibular anterior teeth
→ cannot be seen when maxillary and mandibular teeth are in contact
LINE OF OCCLUSION (BONWILL)
when a person smiles, the curve line following the incisal edges of maxillary teeth
SMILE ARC
“esthetic line of dentition”
SMILE ARC
the anterior portion of this esthetic line of dentition
SMILE ARC
straight
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
A
convex
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
D
normal (ideal) occlusion
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
A
molar relationship:
mesiobuccal cusp of maxillary first permanent molar occludes with the buccal groove of the mandibular first permanent molar
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
A
distoclusion
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
B
molar relationship:
o buccal groove of the mandibular first permanent molar is distal to the mesiobuccal cusp of the maxillary first permanent molar by at least the width of a premolar
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
B
mesioclusion
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
C
molar relationship:
o buccal groove of the mandibular first permanent molar is mesial to the mesiobuccal cusp of the maxillary first permanent molar by at least the width of a premolar
A. Class I
B. Class II
C. Class III
D. Class II, III
E. Class I ,III
C
CLASS I
crowded incisors
A. Type I
B. Type II
C. Type III
D. Type IV
E. Type V
A
CLASS I
labioverted/protruded maxillary incisors
A. Type I
B. Type II
C. Type III
D. Type IV
E. Type V
B
CLASS I
pseudo-class III or anterior crossbite
A. Type I
B. Type II
C. Type III
D. Type IV
E. Type V
C
CLASS I
posterior cross-bite
A. Type I
B. Type II
C. Type III
D. Type IV
E. Type V
D
CLASS I
mesial drifting of molars due to premature loss of tooth
A. Type I
B. Type II
C. Type III
D. Type IV
E. Type V
E
all anteriors protruded
A. Division I
B. Division II
A
1 or more incisors retruded
A. Division I
B. Division II
B
CLASS III
edge to edge anteriors
A. Type I
B, Type II
C. Type III
A
CLASS III
crowded mandibular anteriors & they are in crossbite
A. Type I
B, Type II
C. Type III
B
CLASS III
crowded maxillary anteriors & they are in crossbite
A. Type I
B, Type II
C. Type III
C
