operative Flashcards
attrition vs abrasion vs abfraction vs erosion
attrition - mechanical wear due to excessive masticatory forces
abrasion - loss of tooth material by mechanical means other than opposing teeth (ex: tooth brushing)
abfraction - loss of tooth substance caused by biomechanical loading forces (flexural forces or lateral stresses)
erosion - loss of tooth structure from chemical process
3 characteristics for classifying cavities
-according to location
-according to G.V black cavity classification
-according to activity of carious lesion
according to location (3 areas)
-pits and fissures caries
-smooth surface caries
-root surface caries
class I
(posterior and anterior teeth) [pits and fissures]
-occlusal of molar and premolars
-facial and lingual pits of molars
-lingual pits of maxillary anterior
class II
proximal of posterior teeth
-mesial/and or distal proximal surfaces
-typically include occlusal (MO, DO, MOD)
class III
proximal of anterior teeth
-does not include incisal angle
class IV
inciso-proximal of anterior teeth
-does include incisal angle
class V
gingival 1/3 of facial or lingual of all teeth
class VI
on incisal edge or occlusal cusp tips of all teeth
according to activity of carious lesion types
-active
-inactive (arrested)
ADA caries classification system
visual - tactile examination & bitewing radiography
E0 - No lesion (sound)
E1 - Outer 1/2 of enamel (initial)
E2 - Inner 1/2 of enamel (initial)
D1 - Outer 1/3 of dentin (initial)
D2 - Middle 1/3 of dentin (moderate)
D3 - Inner 1/3 of dentin (advanced)
numbering system of instruments if theres 3#
1st # - width (mm)
2nd # - length (mm)
3rd # - angle of blade to long axis (cm)
numbering system of instruments if there’s 4#
1st # - width (mm)
2nd# - angle of cutting edge to long axis of handle (cm)
3rd # - length (mm)
4th # - angle of blade to long axis (cm)
balanced range for instrument
blade within 2-3 mm of long axis of handle
handle length and diameter
length 5.5in
diameter 5.5 mm
