GDS Midterm II - Occlusion, Operative, and Composite Questions

GV black protocols for cavity preps involves all of the following except

Resistance form that includes extension into dentin Extension for prevention Opening all embrasures Minimally invasive dentistry*

All mandibular movement starts from the

Rest position

The tapering form in the proximal box is what step of cavity preparation?

Retention form

When preparing for a class II restoration, we plane the gingival cavosurface enamel margin due to the fact that the enamel rods

Slant in a gingival direction approximately 20 degrees

The lingual cusp of the 2nd maxillary premolar contact the

Marginal ridges of the mandibular 2nd premolar and 1st molar *supporting cusp*

The condyle on the non-working side moves

Medially, downward, forward

The balancing side is the term used which fabricating full dentures for a patient. This is known as ___?

Medio-trusive

When the patient goes into left working side, the right condyle

Moves downward, forward, and medially

When you go into left laterotrusive movement the lingual cusp of #13 passes through the occlusal lingual embrasure of teeth ___ and ____

#20 and #19

Centric occlusion is ____-guided

Tooth-guided

Undercuts are placed in some cavity preparations as a means for mechanical retention. When indicated and placed, undercuts must always be placed

1/2mm from dentin-enamel junction Placed in dentin

For which of the following teeth could you draw an imaginary straight line through the central grooves?

14, 15, 16 3, 4, 5 28, 29, 30, 31** 12, 13, 14, 15 *mandibular posteriors

The position of the decay in teeth often determines whether a modification of the preparation is necessary. This is called

Access form

Which of the following is/are component(s) of outline form?

At least 2mm of amalgam and mesial/distal acute angles Parallel walls in proximal box and 1.7 mm of amalgam At least 1-1.3mm axial depth and a rounded axial pulpal line angle Slightly up the major grooves and preserving the uninvolved marginal ridges* At least 1-1.3mm axial depth and obtuse facial and lingual occlusal walls

In a modified class II DO amalgam preparation, outline form should

Be 1mm at the narrowest portion on the occlusal Just break contact gingival in the box Go halfway up the major grooves occlusally

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 classic Class II and III cavity preparations.

Both statements are false.

The DB cusp of the mandibular second molar occludes on the marginal ridges of the maxillary 1st and 2nd molars. The MB occludes in the central fossa of the maxillary 2nd molar.

Both statements are false. The DB cusp of the mandibular second molar occludes in the central fossa of the maxillary second molar.

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.

Both statements are false. *Pulpal wall = perpendicular; internal wall *Axial wall = parallel; internal wall

In the modified Class II G.V. Black preparation, you must extend into the gingival embrasure. The proximal must converge gingival-occlusally.

Both statements are true

A point angle is where three surfaces come together. All line angles are rounded.

Both statements are true.

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?

Break gingival contact Not break lingual contact Place retention grooves Plane unsupported rods gingivally

When passing into left latero-trusive, the mesiobuccal cusp of #15 passes through the

Buccal of #18

The guiding inclines of mandibular posterior teeth are the

Buccal slope of the lingual cusps

The guiding inclines of mandibular posterior teeth are the

Buccal slopes of the lingual cusps

When going into laterotrusive movement, the posterior teeth dis-occlude

Canine guidance????

One of the most difficult things about cavity preparation is

Caries removal* Retention form Outline form Margination

The only symmetric movement/s of the mandible is/are

Centric relation and protrusion

Which mandibular is non-functional?

Centric relation** Centric occlusion Laterotrusive Mediotrusive

In what ideal amalgam preparation can you leave supported enamel?

Class III

The facial and lingual walls of the proximal box of a class II amalgam preparation

Converge towards the occlusal Face each other

In a contemporary class II amalgam, how would you treat the proximal box?

Extend into the gingival embrasure

To break gingival contact in order to find the decay, one must

Extend the gingival floor

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

Extend the preparation and include the distal surface

When preparing tooth #29 for a class I amalgam restoration, the correct outline form

Dictates that you have minimum 1mm FL & MD width Dictates that you extend 2mm into the minor grooves Dictates that you must extend 1/4 into the cusps Has 1.7-2mm pulpal depth Preserves the marginal ridges

The distal cusp of the mandibular 1st molar occludes in/on the

Distal fossa of the maxillary 1st molar

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?

Extend the preparation sufficiently gingivally.

All of the following is/are external wall EXCEPT?

Facial Lingual Gingival and facial Axial and pulpal*

When the posterior teeth are to cross-bite, which cusps are considered to be the supporting cusps?

Facial of the maxillary Lingual of the mandibular

With incisal guidance (protrusive movement), what contacts occur?

Facial surfaces of the mandibular incisors and lingual surfaces of the maxillary incisors

Convenience (access) form may be defined as that shape of the cavity preparation which

Facilitates preparation and restoration

Resistance form for a class II amalgam may be defined as

Flat pulpal floor Flat gingival floor Rounded axial-pulpal line angle 1-1.3 mm axial depth 1.7 mm pulpal depth

Tooth 29 is rotated 90 degrees with the anatomical facial surface facing toward the distal. on x-ray you see D2 caries on the mesial. Where is the caries located?

Gingival to the contact area

Fracture at the axial pulpal line angle of a class II amalgam restoration may be due to

High occlusion Prep too shallow Too narrow occlusal prep in the buccal and lingual direction

When the mandibular canine cusp is distal to the embrasure of the maxillary lateral incisor and canine, the patient is in a Class ___ occlusion

II

The primary reason for failure of composite resin restorations is

Improper moisture control

How is saliva important in limiting or reducing the potential for caries?

Increases the pH of the mouth???

All of the following muscles contribute to centric occlusion except?

Lateral pterygoid** Temporalis Medial pterygoid Masseter

Which muscle contraction will cause the mandible to go into a right laterotrusive movement

Left lateral pterygoid

In class I occlusion, the mandibular canine cusp

Lies in the lingual embrasure between the maxillary lateral incisor and canine

Which of the following cusps occlude in fossae?

Lingual cusp of the maxillary 1st molar DB cusp of the mandibular 1st premolar Lingual cusp of the maxillary 2nd molar *supporting cusps = lingual of maxillary, buccal of mandibular*

The lingual cusp of the mandibular 1st premolar is non-functional but in centric occlusion it lies approximately to the

Lingual embrasure of the maxillary canine and maxillary 1st premolar

When going into left laterotrusive, the heart shaped type maxillary left second molar lingual cusp passes through the

Lingual groove of the mandibular second molar ????

When restoring the occlusal of a maxillary first molar, which cusp(s) is/are functional in centric occlusion?

ML and DL

The MI angle of the mandibular lateral incisor occludes with the

MMR of the maxillary central incisor

Which of the following has/have the potential of contacting both anterior and posterior antagonists?

Mandibular 1st premolar + Maxillary canine

In a full complement of teeth, which tooth/teeth have only one antagonist

Mandibular central incisors and maxillary third molars

The roots of the following teeth in human function tilt lingually except

Mandibular molars

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

No rounding of the axial-pulpal line angle.

In a class II amalgam preparation, extending into the gingival embrasure is considered part of the

Outline form

Preserving the uninvolved marginal ridge is what part(s) of cavity preparation?

Outline form and depth Resistance form

To provide resistance in the proximal box of a class II, the gingival floor should be placed

Perpendicular to the long axis of the tooth

In centric occlusion, which class of teeth have the least facia-lingual or mesio-distal tilt?

Premolars

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

Preserve the lingual cusp and avoid the buccal pulp horn

You have just completed a class II preparation with a divergent, occlusal to gingival, proximal box. What will that do for the preparation?

Prevent the restoration from falling out

The symmetrical movement(s) of the mandible is/are all of the following except?

Protrusive Position Retrusive Position Lateroprotrusive position**

A 25-year-old patient presents with a very large class I carious lesion, approaching the pulp. The best way to excavate this lesion is to

Remove decay from the periphery first then pulpally

You placed a composite to restore tooth #29 MO. After polishing and checking for occlusion, you occlude a significant...in that area of the distal marginal ridge that is the size of an enamel plugger. To properly treat that tooth you would

Replace the entire restoration Etch, place bonding agent and composite resin Etch and place composite* Etch and place pit and fissure sealant Etch and place bonding agent

Creating an obtuse angle with the pulpal floor and the distal of the uninvolved marginal ridge is part of

Resistance form

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?

Resistance form

The convexity of the axial wall of a class II amalgam preparation is part of

Resistance form

Which of the following is/are muscles to elevate the mandible?

Temporalis, medial pterygoid, masseter

A patient presents to your office with only 0.5 mm of enamel on the occlusal surfaces. you need to ... on the occlusal surface of tooth #18. As such which statement is true?

The amalgam must be at least 1.7mm in thickness and extend 1.2 mm into dentin* The amalgam must be at least 3 mm in thickness The amalgam must be at least 1.7mm in thickness only The amalgam will extend 1.7 mm into dentin

The rubber dam clamps used for molars and premolars contain several parts. There are two holes placed...that permit you to place the rubber dam clamp with the force. These holes allow you to...thereby preventing aspiration. The part of the clamp that connects the two jaws is called

The bow

What areas of a class I amalgam preparation provide a portion of the retention form?

The external walls

The maxillary canine cusp tip is located in ..?

The facial embrasure between the mandibular canine and the 1st premolar

A patient appears in your office with a class I occlusion and crossbite of the incisors. Thus, ..?

The facial surface of the maxillary teeth are in contact with the lingual surface of the mandibular teeth.

An ideal maxillary class III preparation has bevels. But, you must plane the gingival margin.

The first statement is false. The second statement is false.

The buccal cusps of the maxillary teeth are supporting cusps. The buccal cusps of the mandibular teeth are supporting cusps.

The first statement is false. (they are guiding cusps; lingual cusps of maxillary teeth are supporting). The second statement is true.

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.

The first statement is true. The second statement is false.

In a class II preparation, retention is accomplished by facing walls in the proximal box. The occlusal portion has acute angles mesiodistally.

The first statement is true. The second statement is false. *acute angles faciolingually.

An S curve is part of the outline form that may be necessary to achieve a 90 degree exit angle when doing an amalgam preparation. It is most usually required when opening the lingual embrasure between teeth 12 and 13.

The first statement is true. The second statement is false. *facial embrasure

The location of the proximal box on class II prep is dictated by

The inter proximal contact area

Your afternoon clinic patient has worn through almost all of his occlusal enamel. As such, which statement(s) is/are true?

The pulpal floor should be perpendicular to the long axis of the tooth The preparation must extend at least 1.2mm into dentin The amalgam must be at least 1.7mm in thickness The pulpal depth of the preparation will need to be at least 1.7mm

What is the reason for removing unsupported enamel in amalgam preparations?

To prevent recurrent decay

The bennett's movement is the bodily shift of the mandible toward the

Working side condyle

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

spoon excavators and slow round bur