tofflemire Flashcards
cavity wall
a side/surface of the tooth that has been prepared for a restoration
internal wall
wall that does not extend to the external tooth surface
axial wall
internal wall of the prepared tooth that runs parallel to the long axis of the tooth
pulpal wall
internal wall that is perpendicular to the long axis of the tooth
proximal wall
surface/side of a tooth that is next to an adjacent tooth
(mesial/distal)
lingual wall
surface/side towards the tongue
buccal/facial
surface/side towards the cheek
labial/facial
surface/side towards the lip
gingival wall
surface next to the gingival margin
line angle
junction of two walls in the preparation that form a line
where the medial and lingual wall meet, it is the mesial-lingual
point angle
angle formed at the junction of 3 surfaces at one point
mesio-lingual-occlusal
cavosurface margin/ cavosurface angle
angle in cavity prep, formed by the junction of the cavity wall with exterior tooth surface
cupping
gap/indentation in the restorative material
overhang
excessive restorative material extending beyond the prep
purpose of cavity preparation
removing decay with limited amount of healthy tooth structure removed, for the tooth to receive and maintain a restoration
two stages of cavity preparation
initial preparation
final preparation
initial stage of cavity preparation
develop an outline form and initial depth and establish primary resistance and retention
final stage of cavity preparation
remove any remaining enamel, infected dentin or old restorative material
applied additional resistance and cavity wall conditioning
tofflemire matrix assembly materials
tofflemire retainers
tofflemire matrix band
wedge
tofflemire retainer
aka universal retainer
device that holds the matrix band snuggly in position, usually positioned on the buccal for an interproximal restoration unless unable then positioned lingually
5 components on the universal retainer
outer knob
inner knob
spindle
diagonal slot
guide slot
outer knob on the universal retainer
tightens or loosens spindle; holds band securely in place
inner knob on the universal retainer
increases or decreases the size of the matrix band
spindle on the universal retainer
internal screw like pin that fits into the diagonal slot
diagonal slot on the universal retainer
positions the end of the matrix; always faces towards the gingiva
guide slot on the universal retainer
positions matrix for either left or right
tofflemire matrix band
a properly contoured piece of metal used to support and give form to the (usually) amalgam restoration during placement while it hardens
three used types of matrix bands
universal
medium MOD
wide MOD
wedge
composed of plastic or soft wood and is placed gingival to the gingival wall of the cavity preparation between the matrix band and the adjacent tooth
function of the wedge
adapts matrix band firmly to the gingival wall of the cavity preparation and provides minimal separation of the teeth
how many millimetres should the matrix band protrude from the diagonal slot
approximately 1.0mm
auto matrix system
uses retainer to hold band in place and uses a tightening wrench and removing pliers
matrices for composite restorations
clear plastic matrix
celluloid matrix
mylar matrix
also used for class III + IV restorations
and sectional or pliant matrix band
matrices for primary teeth
t band
spot welded band
t band matrices
a copper band in the shape of a T
spot welded band
form fitted around the tooth using #110 pliers then is removed and placed in the spot welder
matrix is welded in 3 spots
what direction is the wedge placed
lingually
