class v [lecture by dr.wedad etman @amcofam]
TRANSCRIPT
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8/6/2019 Class V [Lecture by Dr.Wedad Etman @AmCoFam]
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8/6/2019 Class V [Lecture by Dr.Wedad Etman @AmCoFam]
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Smooth surface lesions
Located on the gingival third of
labial, buccal & lingual surfaces of
all teeth
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8/6/2019 Class V [Lecture by Dr.Wedad Etman @AmCoFam]
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CARIES may not be the only reasonCARIES may not be the only reasonCARIES may not be the only reasonCARIES may not be the only reason
Causative factor
Abrasion , Erosion & AbfractionAbrasion , Erosion & AbfractionAbrasion , Erosion & AbfractionAbrasion , Erosion & Abfraction couldcouldcouldcould
ALSO be responsible for class V lesionsALSO be responsible for class V lesionsALSO be responsible for class V lesionsALSO be responsible for class V lesions
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1111.... The carious lesion usually starts as aThe carious lesion usually starts as aThe carious lesion usually starts as aThe carious lesion usually starts as awhite or chalky line at the gingivalwhite or chalky line at the gingivalwhite or chalky line at the gingivalwhite or chalky line at the gingival 1111////3333 ofofofof
clinical characteristics
2222.... Usually affects multiple teethUsually affects multiple teethUsually affects multiple teethUsually affects multiple teeth( high caries susceptibility )( high caries susceptibility )( high caries susceptibility )( high caries susceptibility )
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3333.... Spread mesially & distally to the axialSpread mesially & distally to the axialSpread mesially & distally to the axialSpread mesially & distally to the axial
angles of teethangles of teethangles of teethangles of teeth4444.... Causes Cervical sensitivityCauses Cervical sensitivityCauses Cervical sensitivityCauses Cervical sensitivity
5555.... e more convex is t e sur acee more convex is t e sur acee more convex is t e sur acee more convex is t e sur acemore liable tomore liable tomore liable tomore liable to
cervical cariescervical cariescervical cariescervical caries6666. More frequent among old. More frequent among old. More frequent among old. More frequent among old----aged patientsaged patientsaged patientsaged patients
(senile caries)(senile caries)(senile caries)(senile caries)
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8/6/2019 Class V [Lecture by Dr.Wedad Etman @AmCoFam]
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The Outline Form
Class V cavity usuallyClass V cavity usuallyClass V cavity usuallyClass V cavity usually
TrapezoidalTrapezoidalTrapezoidalTrapezoidal outlineoutlineoutlineoutline withwithwithwith straightstraightstraightstraight
with thewith thewith thewith the short armshort armshort armshort arm being thebeing thebeing thebeing thegingivalgingivalgingivalgingival
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8/6/2019 Class V [Lecture by Dr.Wedad Etman @AmCoFam]
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Mesial & distal walls
extended to but not encroaching onaxial line angles & Parallel to the M &
Location of marginsLocation of marginsLocation of marginsLocation of margins
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Occlusal wall located at but notincluding the height of contour
Gingival wall straight & parallel toocclusal plane at the gum margin
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Axial wall in dentin (0.5 mmunder DEJ)
convex outwards Mesiodistally &occlusogingival following contour offacial surface
provides resistance
& maximal pulpprotection protection
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Internal anatomy M & D walls are divergent outwards
(flare mesially & distally )..tofollow the direction of enamel rods -
provide strength for the tooth & amalgam & prevent undermined enamel walls
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8/6/2019 Class V [Lecture by Dr.Wedad Etman @AmCoFam]
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Occlusal & gingival walls formedof 2 planes:
a. Grooved internal dentin plane(mechanical retention lock)
Internal anatomyInternal anatomyInternal anatomyInternal anatomy
. uter ename p ane o ow ngthe direction of enamel rods
To form 9090 cavo-surfaceangle ..resistance
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Gingival depth ....- mm
Occlusal wall is.-. mm
Slightly deeper at the occlusalwall where there is thicker
enamel
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8/6/2019 Class V [Lecture by Dr.Wedad Etman @AmCoFam]
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If the gingival wall is located on
cementum at the root, it is alsoformed of two planes
of dentin &
* an outer flat plane made ofdentin & cementum
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Resistance and
Retention
It is not subjected to a direct
functional loading Definite line & point angles
Walls to the floorA minimum dept ofA minimum dept ofA minimum dept ofA minimum dept of00000000........55555555 mmmmmmmmmmmmmmmm in dentinin dentinin dentinin dentin
uniform bulk of amalgamuniform bulk of amalgamuniform bulk of amalgamuniform bulk of amalgam Grooves
pins
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Enamel hatchet or wedelstadetchisel
are used to finish the Enamel marginsto provide a
cavo-surface angle