Page | 1
DASLE MN Questions and Verified Answers
What system has a tightening wrench to tighten and loosen the band?
Ans: Automatrix
What is the purpose of a wedge? How many do you need for an MOD restoration?
Ans: To contour and hold the band securely, 2 wedges
auto matrix is unique in that it has a wrench that does what?
Ans: has no retainer to hold the band in place. the tightening wrench is
inserted into the coil and is turned clockwise to tighten the band
What occurs if the wedge is not place properly?
Ans: Overhang or cupping
Class III & IV composites use what type of matrix system?
Ans: Celluloid strip "Mylar"
wedges function is to?
Ans: insert into the lingual embrasure to hold the band firmly against the
gingival margin of the prep.
for posterior restoration, where is the wedge inserted?
Ans: inserted on the lingual side
what is used to insert the wedge?
Ans: 110 howe pliers
The universal band when placed should extend _____ mm above the ________
surface?
Ans: 1 ½ to 2 mm above the occlusal surface
what is T-band made from?
Ans: stainless steel or copper
, Page | 2
what is the universal retainer (tofflemire retainer)
Ans: a mechanical device that holds the matrix band snugly in position. it's
designed for class II amalgam restoration and intermediate. It's positioned
from the buccal surface of the tooth being restored
Explain the rule for posterior teeth isolation.
Ans: Isolate 1 to 2 teeth distal to the tooth being treated (working tooth),
and isolate 3 to 4 teeth mesial or 6 to 8 teeth for better stability
Explain the rule for anterior teeth isolation. What is the exception to the rule?
Ans: Isolate canine to canine, clamp may not be needed, ligate between
canine and 1st premolar
Anterior/cervical clamp may be used for Class V, endo tooth or premolar
clamps may be used
The bow of the dental dam clamp is placed towards the _____ and the four points
of the clamp are resting _______________?
Ans: The distal and below the height of contour
Which side of the tooth is the clamp placed on first?
Ans: Lingual, this allows for a fulcrum to place the clamp
List items that can be used to invert dental dam.
Ans: Air, Plastic instrument (blunt instrument), black spoon or beavertail
burnisher, Waxed floss
the bow of the dental dam clam is placed towards the _____ and the four points of
the clamp are resting _______?
Ans: towards the distal and the four points of the clamp are resting below
the height of contour
Which side of the tooth is the clamp placed on first?
Ans: Lingual, this allows for a fulcrum to place the clamp
List items that can be used to invert dental dam.
Ans: Air, Plastic instrument (blunt instrument) black spoon or, beavertail
burnisher, Waxed floss
, Page | 3
List the hole punch numbers for each type of tooth:
Ans: 5 - Anchor Tooth (clamped tooth) or keyhole punch #5 (double
punched if using a winged clamp)
4 - MX & MN molars
3 - MX & MN canines and premolars
2 - Maxillary anterior centrals & laterals
1 - Mandibular anterior centrals & laterals
List the steps for removal of the dental dam.
Ans: Remove opposite ligature/anchor (Wedjet or floss)
Cut the dam septum on the facial side
Remove the clamp
Remove dam and frame
Check for pieces
Floss
Massage tissue
List the uses/advantages of using dental dam.
Ans: Better patient management and protection from debris, materials and
liquids
Controls moisture
Decreases operator time
Effective barrier control for infection control
Used for RCT, sealants, restorations, whitening, not used for oral surgery
Why is a dental dam napkin used?
Ans: Absorbs moisture, Latex allergies or reduce latex sensitivity, Patient
comfort
Which clamp is used for a class V restoration?
Ans: Cervical clamp (butterfly) 9, 212, 214 etc.
Which dental frame is placed under the dam material?
, Page | 4
Ans: Plastic U-shaped frame due to being radiolucent
Which dental frame is placed on the outside of the dam material?
Ans: Youngs U-shaped metal frame
Otsby plastic round frame
What happens if the holes are punched too close together?
Ans: the dam may tear and stretch. stretched holes may leave the gingiva
exposed and may cause leakage
What happens if the holes are punched too far apart?
Ans: excess material is present between the teeth. this may block the DDS
vision or catch in instrumentation
What happens if the curve of the arch is punched too flat? Too narrow?
Ans: If too flat or wide = bunching on lingual
If too curved or narrow = folding on the facial
How far apart should the holes be spaced?
Ans: 3.0-3.5 mm
Prior to the application of sealants, what are the teeth are cleaned with?
Ans: Prophy brush and non-fluoridated pumice, no oils (can interfere with
the bonding process)
Which are etched longer, permanent or primary teeth?
Ans: Primary teeth because they are stronger and teeth with fluorosis
What is the composition of the etching material?
Ans: 37% phosphoric acid (35-47%)
What is the best isolation technique when applying sealants?
Ans: dental dam
Describe characteristics of an etched surface.
DASLE MN Questions and Verified Answers
What system has a tightening wrench to tighten and loosen the band?
Ans: Automatrix
What is the purpose of a wedge? How many do you need for an MOD restoration?
Ans: To contour and hold the band securely, 2 wedges
auto matrix is unique in that it has a wrench that does what?
Ans: has no retainer to hold the band in place. the tightening wrench is
inserted into the coil and is turned clockwise to tighten the band
What occurs if the wedge is not place properly?
Ans: Overhang or cupping
Class III & IV composites use what type of matrix system?
Ans: Celluloid strip "Mylar"
wedges function is to?
Ans: insert into the lingual embrasure to hold the band firmly against the
gingival margin of the prep.
for posterior restoration, where is the wedge inserted?
Ans: inserted on the lingual side
what is used to insert the wedge?
Ans: 110 howe pliers
The universal band when placed should extend _____ mm above the ________
surface?
Ans: 1 ½ to 2 mm above the occlusal surface
what is T-band made from?
Ans: stainless steel or copper
, Page | 2
what is the universal retainer (tofflemire retainer)
Ans: a mechanical device that holds the matrix band snugly in position. it's
designed for class II amalgam restoration and intermediate. It's positioned
from the buccal surface of the tooth being restored
Explain the rule for posterior teeth isolation.
Ans: Isolate 1 to 2 teeth distal to the tooth being treated (working tooth),
and isolate 3 to 4 teeth mesial or 6 to 8 teeth for better stability
Explain the rule for anterior teeth isolation. What is the exception to the rule?
Ans: Isolate canine to canine, clamp may not be needed, ligate between
canine and 1st premolar
Anterior/cervical clamp may be used for Class V, endo tooth or premolar
clamps may be used
The bow of the dental dam clamp is placed towards the _____ and the four points
of the clamp are resting _______________?
Ans: The distal and below the height of contour
Which side of the tooth is the clamp placed on first?
Ans: Lingual, this allows for a fulcrum to place the clamp
List items that can be used to invert dental dam.
Ans: Air, Plastic instrument (blunt instrument), black spoon or beavertail
burnisher, Waxed floss
the bow of the dental dam clam is placed towards the _____ and the four points of
the clamp are resting _______?
Ans: towards the distal and the four points of the clamp are resting below
the height of contour
Which side of the tooth is the clamp placed on first?
Ans: Lingual, this allows for a fulcrum to place the clamp
List items that can be used to invert dental dam.
Ans: Air, Plastic instrument (blunt instrument) black spoon or, beavertail
burnisher, Waxed floss
, Page | 3
List the hole punch numbers for each type of tooth:
Ans: 5 - Anchor Tooth (clamped tooth) or keyhole punch #5 (double
punched if using a winged clamp)
4 - MX & MN molars
3 - MX & MN canines and premolars
2 - Maxillary anterior centrals & laterals
1 - Mandibular anterior centrals & laterals
List the steps for removal of the dental dam.
Ans: Remove opposite ligature/anchor (Wedjet or floss)
Cut the dam septum on the facial side
Remove the clamp
Remove dam and frame
Check for pieces
Floss
Massage tissue
List the uses/advantages of using dental dam.
Ans: Better patient management and protection from debris, materials and
liquids
Controls moisture
Decreases operator time
Effective barrier control for infection control
Used for RCT, sealants, restorations, whitening, not used for oral surgery
Why is a dental dam napkin used?
Ans: Absorbs moisture, Latex allergies or reduce latex sensitivity, Patient
comfort
Which clamp is used for a class V restoration?
Ans: Cervical clamp (butterfly) 9, 212, 214 etc.
Which dental frame is placed under the dam material?
, Page | 4
Ans: Plastic U-shaped frame due to being radiolucent
Which dental frame is placed on the outside of the dam material?
Ans: Youngs U-shaped metal frame
Otsby plastic round frame
What happens if the holes are punched too close together?
Ans: the dam may tear and stretch. stretched holes may leave the gingiva
exposed and may cause leakage
What happens if the holes are punched too far apart?
Ans: excess material is present between the teeth. this may block the DDS
vision or catch in instrumentation
What happens if the curve of the arch is punched too flat? Too narrow?
Ans: If too flat or wide = bunching on lingual
If too curved or narrow = folding on the facial
How far apart should the holes be spaced?
Ans: 3.0-3.5 mm
Prior to the application of sealants, what are the teeth are cleaned with?
Ans: Prophy brush and non-fluoridated pumice, no oils (can interfere with
the bonding process)
Which are etched longer, permanent or primary teeth?
Ans: Primary teeth because they are stronger and teeth with fluorosis
What is the composition of the etching material?
Ans: 37% phosphoric acid (35-47%)
What is the best isolation technique when applying sealants?
Ans: dental dam
Describe characteristics of an etched surface.
