Saudi licensing exam

The following chemically bond to the tooth:

Glass ionomer cement

Compomer restorative materials are:

Resin systems with fluoride containing glasses.

Loose enamel rods at the gingival floor of a class II amalgam cavitv should be removed using:

Gingival marginal trimmer.

What is the cavo-surface angle of prep for amalgam restoration:

90 degree

Removal of Undermined Enamel in Class II cavity is done by

Chisel.

Hand instrument which we used to make internal angles retentive grooves and

preparation of cavity walls in the cavity is:

Angle former.

To provide maximum strength of amalgam restoration the cavo-surface angles

should:

1. Approach 75 ° with outer surface.

2. Approach 90 ° with outer surface.

3. Be supported by sound dentine.

4. Be located in area free of occlusal stress.

2+3+3

Which of the following materials has been shown to simulate reparative dentine

formation most effectively when applied to the pulpal wall of a very deep cavity:

Calcium hydroxide preparation.

Calcium hydroxide is best pulp capping material because:

It induces reparation dentine formation.

Clinical failure of the amalgam restoration usually occurs from:

Improper cavity preparation.

It has been proven that amalgam restoration has the following characteristics:

1. Micro leakage decrease with aging of the amalgam restoration.

2. It is the least techniques sensitive of all current direct restorations.

3. High dimensional changes.

1+2

When polishing the amalgam restoration:

A. Avoid heat generation by using wet polishing paste.

B. Wait 24 hours.

A and B

Maximum time elapsed before condensation of amalgam after titration:

3 minutes

After amalgam titrations, the mix should be placed within:

3 min

• MOD amalgam restoration with deep mesial box, PT come with pain related to it after 1 month due to:

Pulp involvement.

Reduction in amalgam restoration should be:

1.5-2mm

Depth of amalgam restoration should be:

1.5-2mm

Silicate cement:

1. First tooth colored restoration.

2. It can be used as permanent filling.

3. It contains 15 % fluoride.

1 and 3

Length of pins must be equals in both tooth and restoration by a depth of:

2mm

Stainless steel pin is used in amalgam for:

Increase retention.

What can we use under composite restoration:

Ca(oh).

The x- ray of choice to detect the proximal caries of the anterior teeth is:

Periapical x-ray

What is the copper ratio that eliminates gamma phase 2:

13 % copper

To prevent discoloration under amalgam filling:

Use cavity varnish.

Polishing bur have:

More than 12 blades.

Rubber dam is contraindicated in:

Pt with obstructive nose.

Pt complain from pain in 45 which had gold onlays. The pain could be due to:

High thermal conductivity of gold.

• Pt complain from pain during mastication which had gold onlays. The pain could be due to:

Related to periodontal ligament.

Class II composite resin is lined by:

G.I.

In cavity preparation, the width of the cavity is:

1/3 inter cuspal distance.

Selection of shade for composite is done:

None of the above.

Most commonly, after placement of amalgam restoration PT. Complain from pain with:

Cold

Calcium hydroxide is used in deep cavity because it is:

Simulate formation of 2 nddentine.

In placement of rupper dam:

Only 4 contacts 2 lingual surface and 2 buccal surface.

(7 days) after amalgam restoration, Pt came complaining of pain during putting spoon on the restored tooth because:

Galvanic action.

Filling amalgam in the first madibular molar when touch the spoon there is a pain the reason is:

Galvanic action.

The aim of conditioning agent on dentine before GI cement is to remove smear layer:

True

Compomer release fluoride as GI:

False

PT feel pain of short duration after class II restoration. Diagnosis is:

Reversible pulpitis (Hyperemia).

In the preparation of cavity class II , for restoration with composite resin all Cavosurface angles should be:

Well rounded.

Selection of shade for composite is done:

None of the above.

A class IV composite resin restoration should be finished with a:

12- fluted carbide bur.

In Class V composite restorations a layer of bonding agent is applied:

Following removal of cement then cured.

After class V GI restoration removal of a thin flush of GI is done by:

A. Scaller or knife immediately.

B. Finishing stone immediately.

C. Scale or knife later.

D. Finishing stone later.

A+D

After finish class v glass-ionomer cement we do finishing with:

Aluminum-oxide disc.

Indirect composite inlay has the following advantages over the direct composite EXCEPT:

Good retention.

Indirect composite inlay has the following advantages over the direct composite EXCEPT:

Price

Indirect composite inlay overcome the direct composite by:

1. Overcome Insufficient polymerization

2. Good contact proximally

3. Gingival seal

4. Good retention

1,2,3

A glossy finish is best retained on a:

Microfilled composite resin restoration.

Composite for posterior teeth:

Hybrid + rough filler.

For etching 15 sec, for composite restoration use:

37% phosphoric acid.

After class II amalgam fill , broken is happen in isthmus area why:

Over high of filling vertically.

Small caries confined to enamel:

Preventive measure.

In enamel caries passing half of enamel:

Restoration

At which location in enamel is the density of enamel crystals is lowest:

DEJ

Rampant caries in adult in anterior teeth restored by:

Glass ionomer.

Most of dentine bonding material need conditioning time:

15 sec

Time of curing of dentine:

30 sec.

Light curing time for simple shallow class III composite:

20 sec

Cavity varnish should be applied at least in:

Two layer.

During placement of amalgam pins, the number of pins per cusp is:

1 pin

The cause of fracture in amalgam class II restoration is:

Thin thickness at the marginal ridge.

Contact area is in incisal/occlusal 1/3 in which tooth:

Mandibular incisors.

Incipient caries is diagnosed by:

Fiber optic light.

The spontaneous production of an electric current resulting from two dissimilar metal in the oral cavity is called:

Galvanic action.

One week after filling of class II restoration, the Pt present with a complain of tenderness on mastication and bleeding from the gingival. The dentist should initially:

Check the contract area.

Which one of the following is not a characteristic of dentinal hypersensitivity:

It is one of the most successfully treated chronic dental problems.

Hypersensitivity is due to:

Exposed dentine with opened dentinal tubules.

The function of the anterior teeth is:

Incise food.

In geriatric Pt, Cementum on the root end will:

Become thicker and irregular.

Hydrogen peroxide is the ideal bleaching agent because:

All of the above.