answers from Waysem2024.

1000 MCQ's Dental ADC Waysem(1000 MCQ's along with answers from Waysem)2024.

• For lower premolars, the purpose of inclining the handpiece lingually is to,
• Avoid buccal pulp horn
• Avoid lingual pulp horn
• Remove unsupported enamel
• Conserve lingual dentine - Correct Answer A. Avoid buccal pulp horn

Explanation 1- avoid BUCCAL pulp horn 2- conserve ling. dentine So take A and B if available

• For an amalgam restoration of a weakened cusp you should,
• reduce cusp by 2mm on a flat base for more resistance
• reduce cusp by 2mm following the outline of the cusp
• reduce 2mm for retention form - Correct Answer B. reduce cusp by 2mm following the outline of the

cusp Explanation F cusp = 0.5-1.5 mm acc. to occlusion.Cracked cusp = FLAT BASE

• Before filling a class V abrasion cavity with GIC you should,
• Clean with pumice, rubber cup, water and weak acid 1 / 4

• Dry the cavity thoroughly before doing anything
• Acid itch cavity then dry thoroughly - Correct Answer A. Clean with pumice, rubber cup, water and

weak acid Explanation also scraping with actual cavity prep.

• Which of the following statement about the defective margins of amalgam restorations is true?
• The larger the breakdown, the greater the chance of decay. - Correct Answer A. The larger the

breakdown, the greater the chance of decay.Explanation the larger the gap between the restoration and the tooth, the more the chance for rec. decay --> replace don't repair.

• The retention pin in an amalgam restoration should be placed,
• Parallel to the outer wall
• Parallel to the long axis of tooth - Correct Answer A. Parallel to the outer wall

Explanation RULE OF "2" ???

• The most common cause of failure of the IDN "Inferior Dental Nerve" block is,
• Injecting too low
• Injecting too high - Correct Answer A. Injecting too low

Explanation 2 / 4

Failure of inferior alveolar nerve block:

1- Anatomical:

-accessory nerve supply (MH nerve, cervical cutaneous nerve C1, C2) -variable, variation in course of nerve OR foramen position, -bifid alveolar nerve or mandibular canal

2- Pathological: infection, inflammation, previous surgery; trismus

3- Pharmacological: chronic alcohol abuse, chronic narcotic drug abuse;

4- Psychological: fear, anxiety, apprehension;

5- Poor technique: this is the most common reason for failure. There are three most commonly

occurring problems with this technique:

-Inadequate mouth opening.

-Improper needle placement:

• too low.
• too far forward (laterally) or backward (medially) of the target area (need to insert the needle just

medial to the pterygomandibular raphe à depth of 20 to 25 mm) -Haste: Waiting three to five minutes after the injection before starting the procedure.

7. Which one of the following is used in water fluoridation:

• SnF

B. 1.23% APF

• H2SiF
• CaSiF - Correct Answer C. H2SiF

Explanation

Water fluoridation: 3 / 4

1- Hydrofluosilicic acid = H2SiF6 (not H2SiF2) 2- Sodium silicofluoride = Na2SiF6 3- Sodium fluoride = NaF

• The best way to clean a cavity before the placement of GIC is,

A. H2O2

• Phosphoric Acid
• Polyacrylic acid - Correct Answer C. Polyacrylic acid

Explanation

also called:

-Polycarboxylic acid -Polyalkenoic acid

• The most mineralised part of dentine is,
• Peritubular dentine - Correct Answer A. Peritubular dentine

Explanation NOT intertubular & NOT interglobular dentine.

• A 45 years-old patient awoke with swollen face, puffiness around the eyes, and oedema of the upper

lip with redness and dryness. When he went to bed he had no swelling, pain or dental complaints.Examination shows several deep silicate restorations in the anterior teeth but examination is negative for caries, thermal tests, percussion, palpation, pain, and periapical area of ramififaction. The patient's temperature is normal. The day before he had a series of gastrointestinal x-rays at the local hospital and was given a clean bill of health.

The condition is:

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