GDS Exam #2
The preparation of a Class V amalgam should 1. have the axial wall follow the contour of the facial contour of the tooth 2. have a flat axial wall 3. have the mesial and distal walls at right angles with the axial wall 4. bevel any margin that finishes on enamel A.) 1 and 3 B.) 1, 2, and 4 C.) 3 only D.) 3 and 4 E.) 2 only
A.) 1 and 3
A hand instrument with a formula 13-93-9-13 has a blade with a/an: A.) 13 degree angle to the handle B.) Angle of 9 degrees to the handle C.) Width of 9 mm D.) Length of 1.3mm
A.) 13 degree angle to the handle 1st number = Blade width 2nd number = Angle of cutting edge to handle 3rd number = Length of blade 4th number = Angle of blade to handle
When restoring the occlusal of a maxillary first molar, which cusp(s) is/are functional in centric occlusion 1. mesiobuccal 2. distobuccal 3. mesiolingual 4. distal 5. distolingual A.) 3 and 5 B.) 2, 4, and 5 C.) 2 and 4 D.) 1 and 2
A.) 3 and 5
Which are the critical pHs for the dissolutions of enamel and dentin A.) 5.5 enamel, 6.2 dentin B.) 5.2 enamel, 6.5 dentin C.) 6.5 enamel, 5.2 dentin D.) 6.2 enamel, 5.5 dentin
A.) 5.5 enamel, 6.2 dentin
Contact areas of maxillary premolars are usually found in the buccal 1/3 of the proximal surface. It is imperative to break contact into all embrasures for both class Class II and Class III cavity preparations. A.) Both statements are false B.) The first statement is false, the second is true C.) Both statements are true D.) The first statement is true, the second is false
A.) Both statements are false
Which mandibular movement is non-functional? A.) Centric relation B.) Centric occlusion C.) Laterotrusive D.) Mediotrusive
A.) Centric relation
The only symmetrical movement/s of the mandible is/are A.) Centric relation and protrusvie B.) Centric occlusion C.) Protrusive D.) Centric relation
A.) Centric relation and protrusvie
The mesio-incisal angle of the mandibular lateral incisor occludes with the A.) Distal marginal ridge of the maxillary central incisor B.) Lingual fossa of the maxillary central incisor C.) Lingual fossa of the maxillary lateral incisor D.) Distal marginal ridge of the maxillary lateral incisor
A.) Distal marginal ridge of the maxillary central incisor
You have just entered an operatory where a restorative procedure was recently completed. On the bracket tray, you notice a 10-97-7-15 instrument. The dentist probably just completed A.) Either a DO preparation on #29 or #28 B.) An MO preparation on #3 C.) Either an MO prepration on #29 or #30 D.) A DL prepration on #24
A.) Either a DO preparation on #29 or #28
The most common solvent that we use here at NYUCD is A.) Ethanol B.) Water C.) Acetone D.) None of the choices are correct
A.) Ethanol
You are preparing a posterior tooth for a Class II MO amalgam restoration and notice that you no longer have maintained the integrity of the distal marginal ridge. To remedy this situation, you should A.) Extend the preparation and include the distal surface B.) Deepen the preparation pulpally C.) Deepen the preparation pulpally and axially D.) Finish the preparation and restore
A.) Extend the preparation and include the distal surface
Convenience (access) form may be defined as that shape of the cavity preparation which A.) Facilitates preparation and restoration B.) Best resists the forces of mastication C.) Best hastens preparation time D.) Helps retain the restoration
A.) Facilitates preparation and restoration
All of the following muscles contribute to centric occlusion except A.) Lateral pterygoid B.) Temporalis C.) Medial pterygoid D.) Masseter
A.) Lateral pterygoid
In a full complement of teeth, which tooth/teeth have only one antagonist? A.) Mandibular central incisors and maxillary 3rd molars B.) Maxillary canines C.) Mandibular central incisors D.) Maxillary 3rd molars
A.) Mandibular central incisors and maxillary 3rd molars
Which posterior teeth have the greatest faciolingual tilt? A.) Mandibular molars B.) Maxillary premolars C.) Mandibular 1st premolar D.) None of the choices are correct
A.) Mandibular molars
Where do you place retention groove(s) for a Class III composite preparation? A.) Nowhere B.) Both incisally and gingivally C.) Gingivally D.) Incisally
A.) Nowhere
In centric occlusion, which class of teeth have the least facio-lingual or mesio-distal tilt? A.) premolars B.) incisors C.) canines D.) molars
A.) Premolars
In a Class II MOD amalgam preparation, the pulpal floor is ideally prepared to have a depth of 0.5mm into dentin. What step is this in cavity preparation? A.) Resistance form B.) Margination C.) Retention form D.) Convenience form
A.) Resistance form
The convexity of the axial wall of a Class II amalgam preparation is part of A.) Resistance form B.) Retention form C.) Outline form D.) Both resistance and retention form
A.) Resistance form
You are preparing a Class V on a natural tooth. How is retention accomplished for an amalgam restoration? A.) Retention grooves both gingivally and occlusally B.) Retention grooves gingivally C.) No retention grooves D.) Retention grooves occlusally
A.) Retention grooves both gingivally and occlusally
When preparing for a Class II restoration, we plane the gingival cavosurface enamel margin due to the fact that the enamel rods A.) Slant in a gingival direction approximately 20 degrees B.) Are parallel with the pulpal floor C.) Are unimportant, there is no need to plane if doing a composite D.) Slat in an occlusal direction approximately 20 degrees
A.) Slant in a gingival direction approximately 20 degrees
What areas of a Class I amalgam preparation provide a portion of the retention form? A.) The external walls B.) Obtuse angles of facial and lingual walls of the Class I portion C.) Acute angles of mesial and distal walls of Class I portion and gingival floor D.) The internal wall
A.) The external walls
A patient with a full complement of teeth presents with a Class III caries on the distal of tooth #23. The best approach to this lesion is from: A.) The facial or lingual, whichever is closest to the lesion B.) The distal C.) The facial D.) The lingual
A.) The facial or lingual, whichever is closest to the lesion
When preparing a Class I on tooth #28, you enter the tooth at a 45 degree angle to the long axis of the tooth to: A.) preserve the lingual cusp and avoid the buccal pulp horn B.) preserve the buccal and lingual cusp C.) preserve the buccal cusp and avoid the buccal pulp horn D.) preserve the buccal cusp
A.) preserve the lingual cusp and avoid the buccal pulp horn
You have been in practice for many years and are about to restore three teeth in the maxillary left quadrant, which would be the most difficult in preventing gingival excess? A.) #13 B.) #14 C.) #15 D.) #2
B.) #14
Preserving the uninvolved marginal ridges is what part(s) of cavity preparation? 1. outline form and depth 2. resistance form 3. retention form 4. convenience form 5. secondary resistance and retention form A.) 1 only B.) 1 and 2 C.) 2 and 3 D.) 2 only
B.) 1 and 2
The 12-82-9-18 rectilinear hand instrument has a/n A.) 1.8mm degree angle that the blade makes with the handle B.) 1.2mm width of the blade C.) 9 degree angle that the blade makes with the handle D.) 18 degree angle
B.) 1.2mm width of the blade
You have just completed a DO amalgam preparation on tooth #29 and need to plane the gingival cavosurface margin. Which is the most appropriate rectilinear instrument? A.) 10-7-15 hatchet B.) 10-97-7-15 hatchet C.) 10-87-9-15 hatchet D.) 10-83-7-15 hatchet
B.) 10-97-7-15 hatchet
The hybrid layer consists of A.) Neither A, B, nor C B.) A combination of tooth and resin C.) Only resin D.) Only tooth
B.) A combination of tooth and resin
The position of the decay in teeth often determines whether a modification of the preparation is necessary. This is called A.) Accessory retention B.) Access form C.) Outline form D.) Resistance form
B.) Access form
Which two elements produce gamma 1 A.) Cu without Zn B.) Ag + Hg C.) Sn + Hg D.) Ag + Sn
B.) Ag + Hg
What is the most efficient method of removing marks created by finishing burs? A.) Apply a fine polishing compound with heavy pressure and low speed for a short time until optimally reflective B.) Apply polishing compounds in graded steps, beginning with coarse and ending with super fine C.) Apply a coarse polishing compound with light pressure and low speed for a long time followed by a fine compound with light pressure until optimally reflective D.) Apply a fine polishing compound with light pressure and high speed for a short time until optimally reflective
B.) Apply polishing compounds in graded steps, beginning with coarse and ending with super fine
The distal cusp of the mandibular 1st molar occludes in/on the A.) MMR of the maxillary 2nd molar and DMR of the maxillary 1st molar B.) Distal fossa of the maxillary 1st molar C.) Central fossa of the maxillary 2nd molar D.) Mesial fossa of the maxillary 1st molar
B.) Distal fossa of the maxillary 1st molar
To break gingival contact to find the decay one must A.) Go further axially B.) Extend the gingival floor C.) Go gingivally deeper D.) Widen the gingival floor
B.) Extend the gingival floor
In a classic Class II preparation, retention is accomplished by facing walls in the proximal box. The occlusal portion has acute angles mesio-distally. A.) First statement is false, second is true B.) First statement is true, second is false C.) Both statements true D.) Both statements false
B.) First statement is true, second is false
What is the best suited rectilinear instrument to smooth the pulpal floor of an amagal preparation? A.) Hatchet B.) Hoe C.) 56 burr D.) Excavator
B.) Hoe
You are preparing the facial surface of tooth #19 for a composite restoration. What is the classification of the restoration that will replace the missing tooth structure? A.) III B.) I or V C.) VI D.) II or V E.) I or VI
B.) I or V
When the mandibular canine cusp is distal to the embrasure of the maxillary lateral incisor and canine, the patient is in a Class ____ occlusion A.) III B.) II C.) I D.) I division III
B.) II
The primary reason for the failure of composite resin restorations is A.) Improper margination B.) Improper moisture control C.) Restoration too large D.) Improper curing of the composite
B.) Improper moisture control
How is saliva important of limiting or reducing the potential for caries? A.) Removes or washes away bacteria B.) Increases the pH of the mouth C.) Dilutes the sugar content in the mouth D.) Dissolves the plaque
B.) Increases the pH of the mouth
What muscle will cause the mandible to go into a right laterotrusive movement? A.) Right medial pterygoid B.) Left lateral pterygoid C.) Right lateral pterygoid D.) Left medial pterygoid
B.) Left lateral pterygoid
Perikymata are A.) Found on primary teeth B.) Microanatomical features of enamel formation C.) Where they reach the inner surface enamel D.) Caused by dentin formation
B.) Microanatomical features of enamel formation
When the patient goes into leftworking side, the right condyle A.) Moves laterally B.) Moves downward, forward and medially C.) Rotates and moves medially D.) Rotates and moves downward E.) Rotates
B.) Moves downward, forward and medially
Bevels placed at the gingival and incisal margins of a mesio-lingual composite preparation on tooth #10 are: A.) At a 45 degree angle B.) Not necessary C.) 0.5mm wide D.) Placed to remove unsupported enamel
B.) Not necessary
In a Class II amalgam preparation, extending into the gingival embrasure is considered part of the A.) Access form B.) Outline form C.) Retention form D.) Resistance form
B.) Outline form
You have just completed a Class II preparation with a divergent, occlusal to gingival, proximal box. What will that do for the preparation? A.) Improve the outline form B.) Prevent the restoration from falling out C.) Prevent fracturing of restoration D.) Provide better access
B.) Prevent the restoration from falling out
The main reason for high energy enamel for composite adhesion is A.) Avoiding acid on dentin B.) Proper acid etch with 37% phosphoric acid C.) Roughening the surface with a bur D.) Roughening with a medium sandpaper disk
B.) Proper acid etch with 37% phosphoric acid
You are excavating caries in a large Class II preparation with a great deal of soft decay. The best technique(s) to remove soft decay is/are using A.) Spoon excavators B.) Spoon excavators and slow speed round bur C.) High speed round bur D.) Slow speed round bur
B.) Spoon excavators and slow speed round bur
The buccal cusps of maxillary teeth are supporting cusps. The buccal cusps of mandibular teeth are supporting cusps. A.) Both statements are false B.) The first statement is false, the second is true C.) Both statements are true D.) The first statement is true, the second is falses
B.) The first statement is false, the second is true
The teeth with the greatest facio-lingual tilt are the mandibular central incisors. The teeth with the greatest mesio-distal tilt are the maxillary canines. A.) Both statements are false B.) The first statement is false, the second is true C.) Both statements are true D.) The first statement is true, the second is false
B.) The first statement is false, the second is true Max Central Incisors have greatest F-L tilt, followed by Max Lateral Incisors and then Mand. Incisors
Which of the following elements in the amalgam alloy as the ability to seal the interface between the restoration and the tooth? A.) Copper B.) Zinc C.) Silver D.) Tin
B.) Zinc
When you go into left laterotrusive movement the lingual cusp of #13 passes through the occlusal lingual embrasure of teeth A.) #28 and #29 B.) #20 and #21 C.) #20 and #19 D.) #29 and #30
C.) #20 and #19
In adhesion dentistry, the best wetting angle should be A.) 90 degrees B.) 45 degrees C.) 0 degrees D.) 20 degrees
C.) 0 degrees
Your afternoon clinic patient has worn through almost all of his/her occlusal enamel. Tooth #2 has occlusal caries and requires an amalgam restoration. This tooth has 0.5mm of enamel remaining. As such, which statement(s) is/are true? 1. the pulpal floor should be perpendicular to the long axis of the tooth 2. the preparation must extend at least 1.2mm into dentin 3. the amalgam must be at least 1.7mm in thickness 4. the pulpal depth of the preparation will need to be at least 1.7mm A.) 1 and 2 B.) 3 only C.) 1, 2, 3, and 4 D.) 1, 3, and 4 E.) 3 and 4
C.) 1, 2, 3, and 4
You have just completed a Class II DO amalgam preparation on tooth #14. Due to the caries, the gingival floor is apical to the cemento-enamel junction. What instrument should be used to finish this gingival floor? A.) 10-83-7-15 axe B.) 10-87-7-15 C.) 10-7-15 D.) 10-97-7-15
C.) 10-7-15
The instrument of choice to round the axio-pulpal line angle for a DO amalgam preparation on tooth #19 is A.) 10-93-9-15 hatchet B.) 10-83-7-15 hoe C.) 10-97-7-15 hatchet D.) 10-87-7-15 hatchet
C.) 10-97-7-15 hatchet
In a contemporary Class II amalgam, how would you treat the proximal box that you cannot create a 90 degree exit angle on the proximal facial wall? 1. break facial contact 2. break gingival contact 3. not break lingual contact 4. place retention grooves 5. plane unsupported rods gingivally A.) 1, 2, 4, and 5 B.) 1, 2, and 3 C.) 2, 3, 4, and 5 D.) 4 only
C.) 2, 3, 4, and 5
A patient comes for an examination complaining of tooth structure missing in the Class V area of tooth #2, 3, 4, and 5. On further exam, you notice that the shape of the missing tooth is V-shaped and there is no evidence of softness. The probable cause of the missing tooth structure is: A.) Erosion B.) Abfraction C.) Abrasion D.) Caries
C.) Abrasion
You are preparing an anterior tooth for a composite resin Class V restoration. Retention is accomplished with A.) Placing a retention groove both gingivally and occlusally B.) Placing a retention groove occlusally C.) Adhesion D.) Placing a retention groove gingivally
C.) Adhesion
A point angle is where three surfaces come together. All line angles are rounded A.) Both statements are false B.) The first statement is false, the second is true C.) Both statements are true D.) The first statement is true, the second is false
C.) Both statements are true
In the modified Class II G.V. Black preparation, you must extend into the gingival embrasure The proximal must converge gingival-occlusally. A.) Both statements are false B.) The first statement is false, the second is true C.) Both statements are true D.) The first statement is true, the second is false
C.) Both statements are true
The decay pattern of a Class I will have the base of the V at the enamel surface. The decay pattern of a Class III will have the base of the V at the DEJ. A.) Both statements are false B.) The first statement is false, the second is true C.) Both statements are true D.) The first statement is true, the second is false
C.) Both statements are true
The guiding inclines of mandibular posterior teeth are the A.) Lingual slope of the buccal cusps B.) Lingual slope of the lingual cusps C.) Buccal slope of the lingual cusps D.) Transverse ridge
C.) Buccal slope of the lingual cusps
An OF preparation of tooth #18 is a A.) Class II compound cavity B.) Class I simple cavity C.) Class I compound cavity D.) Class II simple cavity
C.) Class I compound cavity
A carious lesion exists in the mesial and distal fossae of tooth #14. There is caries under the oblique ridge. The outline form of your preparation will A.) Include a distal wall which slightly undercuts the DL cusp B.) Include a slightly acute distal wall of 6 degrees C.) Cross the oblique ridge D.) Have both a mesial and distal occlusal box, separate preparations
C.) Cross the oblique ridge
On x-ray you observe caries on the M surface of tooth #3 that has penetrated into dentin. During your MO preparation, you do not see the caries. What did you fail to do? A.) Extend the preparation sufficiently pulpally B.) Extend the preparation sufficiently axially C.) Extend the preparation sufficiently gingivally D.) Break contact facially and lingually
C.) Extend the preparation sufficiently gingivally
If the four or five enamel organs (lobes) fail to coalesce, it could lead to what class of caries? A.) III B.) V C.) I D.) II
C.) I
You are about to place a large MO amalgam restoration in tooth #15. The restoration will be condensed A.) By alternating between the occlusal and proximal portions B.) In any order, it is unimportant which is first C.) In the proximal portion first D.) In the occlusal portion first
C.) In the proximal portion first
Re-establishing contact areas on adjacent teeth is of the utmost importance when placing restorations. Where is it most difficult to re-establish contact areas? A.) Class VI amalgam restorations B.) Class V composite restorations C.) Posterior composite restorations D.) Posterior amalgam restorations
C.) Posterior composite restorations
Why should the Tofflemire band extend a minimum of 1 mm occlusal to the marginal ridge when placing an amalgam restoration A.) For better proximal contacts B.) For better margin finishing C.) Prevent fracture of the marginal ridge D.) Prevent abrasion of the adjacent tooth
C.) Prevent fracture of the marginal ridge
Which teeth have the greatest faciolingual tilt? A.) #23 and #26 B.) #7 and #10 C.) #24 and #25 D.) #8 and #9
D.) #8 and #9 Max Central Incisors have greatest inclination facially, followed by the Max Lateral Incisors and then Mand Incisors All teeth tilt facial, thus their roots are lingual Except Mand 2nd premolars + Mand Molars The premolars have the least tilt of all teeth and are called the straightest in the mouth
Undercuts are placed in some cavity preparations as a means for mechanical retention. When indicated and placed, undercuts must always be placed: 1. 1/2mm from dental-enamel junction 2. placed in dentin 3. placed in enamel 4. placed at the dental-enamel junction A.) 2 and 4 B.) 2 only C.) 1 and 4 D.) 1 and 2
D.) 1 and 2
With incisal guidance (protrusive movement), the following contacts occur: 1. facial surfaces of mandibular incisors 2. facial surfaces of maxillary incisors 3. lingual surfaces of mandibular incisors 4. lingual surfaces of maxillary incisors A.) 1 and 2 B.) 2 and 4 C.) 2 and 3 D.) 1 and 4
D.) 1 and 4
A patient presents with a Class V carious lesion on the facial of tooth #12 that is subgingival. What is/are the best mean(s) to achieve a dry field when placing a composite resin restoration? 1. retraction cord 2. rubber dam 3. butterfly rubber dam clamp 4. not possible to achieve A.) 2 only B.) 3 only C.) 4 D.) 1, 2, and 3
D.) 1, 2, and 3
In a modified Class II DO amalgam preparation, outline form should 1. be 1mm at the narrowed portion on the occlusal 2. just break contact gingivally in the box 3. be in the middle 1/2 mesio-distally 4. maintain the non-involved marginal ridge integrity 5. go halfway up the major groove occlusally A.) 1, 2, and 5 B.) 1, 2, and 3 C.) 1, 4, and 5 D.) 1, 2, and 4
D.) 1, 2, and 4
The order of steps in placing a Class III composite restoration is: 1. rubber dam 2. shade selection 3. acid etch 4. composite 5. bonding agent A.) 1 - 3 - 5 - 2 - 4 B.) 1 - 2 - 3 - 4 - 5 C.) 3 - 5 - 2 - 1 - 4 D.) 2 - 1 - 3 - 5 -4
D.) 2 - 1 - 3 - 5 -4
Gamma 2 problems of amalgam are which of the following A.) Margin breakdown B.) Corrosion prone C.) Lower strength D.) All the choices are correct
D.) All the choices are correct
An atypical restorative preparation and restoration always involves A.) Smooth surface caries B.) An MOD only C.) A Class IV D.) An onlaying of a cusp
D.) An onlaying of a cusp
All of the following is/are external walls except: A.) Facial B.) Lingual C.) Gingival and Facial D.) Axial and Pulpal
D.) Axial and Pulpal *External Walls* = Distal, Facial, Lingual, Gingival *Internal Walls* = Pulpal, Axial
An ideal maxillary Class III composite preparation has bevels. But you must plane the gingival margin. A.) Both statements are true B.) The first statement is true, the second is false C.) The first statement is false, the second is true D.) Both statements are false
D.) Both statements are false
The pulpal wall is parallel to the long axis of the tooth and is an internal wall. The axial wall is perpendicular to the long axis and is an internal wall of the tooth. A.) First statement is false, second is true B.) First statement is true, second is false C.) Both statements true D.) Both statements false
D.) Both statements false Axial and pulpal walls = internal walls Pulpal wall *perpendicular* to long axis of tooth Axial wall *parallel* to long axis of tooth
When there is a high copper content in a dental amalgam, the following occurs A.) Increases Sn gamma 1 issues B.) More gamma 2 problems C.) More oxidation D.) Eliminates gamma 2 problems
D.) Eliminates gamma 2 problems
The increased possibility for the debonding of composite from the dentinal pulpal floor occurs with A.) Over etching the enamel B.) Failure to remove the organic material from the enamel C.) Etching the dentin first D.) Failure to remove the smear layer
D.) Failure to remove the smear layer
The symmetrical movement(s) of the mandible is/are all of the following except: A.) Protrusive position B.) Retrusive and protrusive positions C.) Retrusive position D.) Lateroprotrusive position
D.) Lateroprotrusive position
The adhesion to enamel is accomplished by _____ of the composite A.) Both chemical and mechanical retention B.) Chemical retention C.) Retention D.) Micromechanical retention
D.) Micromechanical retention
You placed an MO amalgam restoration on tooth #30 one week ago. The patient returns complaining of pain on biting. Upon examination you find that the restoration has fractured. The most likely cause is A.) The axial depth is too great B.) Over beveling of the axial-pulpal line angle C.) Failure to plane the gingival cavosurface margin D.) No rounding of the axial-pulpal line angle
D.) No rounding of the axial-pulpal line angle
You must prepare tooth #4 for an MO composite restoration. There are no molars present in that quadrant. Holding the rubber dam in place could best be accomplished by A.) Tying #4 down with dental floss B.) A clamp on tooth #4 C.) A clamp on tooth #5 D.) Not using a clamp; use a Tofflemire retainer or dental floss on tooth #4
D.) Not using a clamp; use a Tofflemire retainer or dental floss on tooth #4
To provide resistance in the proximal box of a Class II, the gingival floor should be placed A.) Parallel to the long axis of the tooth B.) At gingival level C.) Below the contact point D.) Perpendicular to the long axis of the tooth
D.) Perpendicular to the long axis of the tooth
When we place bonding agent here at NYUCD, which bonding system do we use A.) Bonding agent B.) Primer C.) Acid etch and bonding agent D.) Primer and bonding agent E.) Acid etch and primer
D.) Primer and bonding agent
The poorest of enamel adhesion to the rods is when the enamel rods are A.) Parallel to the bonded surface B.) Perpendicular to the bonded surface C.) Etched for 10 seconds D.) Random, it makes no difference
D.) Random, it makes no difference
The tapering form in the proximal box is what step of cavity preparation A.) Resistance form B.) Outline form C.) Access form D.) Retention form E.) Margination
D.) Retention form
Which of the following is/are component(s) of outline form? A.) At least 2mm of amalgam and mesial and distal acute angles B.) Parallel walls in proximal box and 1.7mm of amalgam C.) At least 1-1.3mm axial depth and a rounded axial pulpal line angle D.) Slightly up the major grooves and preserving the uninvolved marginal ridges E.) At least 1-1.3mm axial depth and obtuse facial and lingual occlusal walls
D.) Slightly up the major grooves and preserving the uninvolved marginal ridges
Class II amalgam preparations on the occlusal surfaces of posterior teeth should extend slightly up the major grooves. Resistance form for this preparation dictates that the facial and lingual walls in the box break contact with the adjacent tooth. A.) The first statement is false, the second is true B.) Both statements are true C.) Both statements are false D.) The first statement is true, the second is false
D.) The first statement is true, the second is false
When preparing an anterior tooth for a Class III composite restoration using the lingual approach, the facial wall parallels the facial surface of the tooth. This preparation should converge from access to facial. A.) Both statements are false B.) The first statement is false, the second is true C.) Both statements are true D.) The first statement is true, the second is false
D.) The first statement is true, the second is false The incisal and gingival walls converge towards the access (the shape of the 330 bur) and face each other
In centric occlusion the inner table between cusps is where A.) Falls in the occlusal 1/3 B.) The guiding cusps occlude C.) Both the guiding and supporting cusps occlude D.) The supporting cusps occlude
D.) The supporting cusps occlude
What is the reason for removing unsupported enamel in amalgam preparations? A.) Aesthetics B.) One of the nine steps of cavity preparation C.) To break contact with the adjacent tooth D.) To prevent recurrent decay
D.) To prevent recurrent decay
You are preparing tooth #19 for an MO amalgam restoration. The gingival floor extends 2mm apical to the CEJ. You see that the matrix band is sufficiently gingival to the marginal ridge. When you switch to a #2 matrix band, you are able to get it through the distal contact but the band extends too far occlusally on the distal portion. Your next step is to: A.) Reset the #1 matrix band B.) Trim both gingival portions off C.) Restore it with composite instead of amalgam D.) Trim the distal gingival portion off
D.) Trim the distal gingival portion off
In a Class V composite preparation that is entirely on enamel, which of the following statements is/are true: 1. bevel the apical portion 2. bevel the occlusal portion 3. the bevel should be at a 45 degree angle 4. bevel the mesial and distal portions A.) 2 and 3 B.) 1 and 2 C.) 1 and 4 D.) all of the statements are true E.) 2 and 4
D.) all of the statements are true
The facial and lingual walls of the proximal box of a Class II amalgam preparation 1. converge towards the occlusal 2. are planed 3. are strictly internal walls 4. face each other A.) 1 and 3 B.) 2 and 4 C.) 2, 3, and 4 D.) 1 and 2 E.) 1 and 4
E.) 1 and 4
Resistance form for a Class II amalgam may be defined as: 1. Flat pulpal floor 2. Flat gingival floor 3. Rounded axial-pulpal line angle 4. 1-1.3mm axial depth 5. 1.7mm pulpal depth A.) 2, 3, and 4 B.) 1, 2, and 4 C.) 1, 2, and 5 D.) 1, 2, 3, and 4 E.) 1, 2, 3, 4, and 5
E.) 1, 2, 3, 4, and 5
