Occlusal Examination

Question 1

In – Edward H. Angle published the

first classification

Answer 1

1899

Question 2

ANGLE’S CLASSIFICATION is based on the

Answer 2

relationship of the MB cusp of the MAXILLARY 1st molar & the BUCCAL groove of MANDIBULAR 1st molar

Question 3

MALOCCLUSION

Answer 3

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

Question 4

CLASS I MALOCCULSION

Answer 4

SAME AS NORMAL OCCLUSION BUT
CHARACTERIZED BY CROWDING,
ROTATIONS, AND OTHER
POSITIONAL IRREGULARITIES

Question 5

Angle’s Class I

Answer 5

MB cusp of
max 1st molar
bisects buccal
groove of
mand 1
st molar

Question 6

Angle’s Class II (2)

Answer 6

 MB cusp of max 1st molar is mesial to mand 1st molar’s buccal groove
 “overbite”

Question 7

Angle’s Class III (2)

Answer 7

 MB cusp of max. 1st molar is distal to buccal groove of mand 1st molar
 “underbite”

Question 8

class 3:
MAXILLARY MB CUSP IS — TO BUCCAL
GROOVE OF MAND. 1ST MOLAR

Answer 8

DISTAL

Question 9

OVERJET (3)

Answer 9

 THE HORIZONTAL OVERLAP OF THE MAXILLARY CENTRAL INCISORS
OVER THE MANDIBULAR CENTRAL INCISORS
 MEASURED USING PERIODONTAL PROBE
 USUALLY 2-3mm

Question 10

OVERBITE (4)

Answer 10

 THE VERTICAL OVERLAP OF THE
MAXILLARY CENTRAL INCISORS
OVER THE MANDIBULAR CENTRAL
INCISORS.
 HOW MUCH OF THE MAXILLARY
TEETH COVER UP THE MANDIBULAR
TEETH
 THE AMOUNT OF OVERBITE IS
MEASURED USING THE PROBE
VERTICALLY.
 NORMAL OVERBITE IS USUALLY 2-
3mm. or approximately 20-30% of
the height of the mandibular
incisors

Question 11

DENTAL WEAR

Answer 11

wear is part of the normal cycle
of the dentition, but excessive
wear and tooth loss leads to a
variety of changes within the oral
cavity

Question 12

The etiology of dental wear is
multifactorial with complex
relationships between three
types of wear:

Answer 12

attrition,
erosion,
and abrasion

Question 13

Evidence of Occlusal Wear/Trauma (3)

Answer 13

 Wear facets
 Broken restorations
 Chipped teeth

Question 14

Evidence of Bruxism (5)

Answer 14

 Bony ridges-exostosis, tori
 Recession
 Abfraction
 Broken teeth & restorations
 Excessive attrition

Question 15

Abfraction

Answer 15

loss of cervical area due to bruxism

Question 16

Attrition

Answer 16

Mechanical wear of the incisal or occlusal surface as
a result of functional or para-functional movements
of the mandible (tooth-to-tooth contact).

Question 17

with Attrition, — accelerates

Answer 17

bruxism

Question 18

attrition can be — related

Answer 18

age

Question 19

with attrition, occlusal surfaces match jaw movements and usually
have similar degree of —

Answer 19

wear

Question 20

Abfraction

 — — -shaped defects.

Answer 20

Cervical wedge

Question 21

Bruxism results in

Answer 21

cervical loss-cervical area of the tooth flexes under the load

Question 22

Abrasion

Answer 22

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.

Question 23

Abrasion may occur from: (3)

Answer 23

 Improper brushing techniquesmost common and usually seen as
a sharp, V-shaped notch in the
gingival 1/3 of the tooth.
 Habits such as holding a pipe stem
by the teeth
 Vigorous use of toothpicks
between adject teeth.

Question 24

Abrasion
 Interproximal: (1)
 Incisal notching: (2)
 Cervical: (1)

Answer 24

Toothpicks

Nails, Pipe

toothbrushing

Question 25

Erosion

Answer 25

Wear or loss of tooth
structure by
chemicomechanical action

Question 26

Facial erosion (2)

Answer 26

 Lemons,

 Chlorine

Question 27

Lingual erosin (1)

Answer 27

 bulimia

Question 28

Bulimia oral signs (5)

Answer 28

 “raised” amalgams
 thermal sensitivity
 Thinning, chipping of incisal edges
 anterior open bite
 loss of vertical dimension