MFDS Clinical Dental Sciences 3

Question 1

Which instrument design is most appropriate for initial negotiation of a calcified or curved root canal?

Accepted Answer

ISO size 10 stainless steel K-file

Answer

ISO size 25 K-file

Answer

ISO size 40 Hedstroem file

Answer

Rotary NiTi file size 25/0.06

Question 2

The recommended minimum ceramic thickness for an all-ceramic posterior crown to prevent fracture is approximately:

Accepted Answer

1.5–2.0 mm

Answer

0.5 mm

Answer

1.0 mm

Answer

3.0 mm

Question 3

The 'C-factor' in composite dentistry refers to:

Accepted Answer

The ratio of bonded to unbonded surfaces affecting polymerisation shrinkage stress

Answer

The colour stability factor

Answer

The contraction coefficient of the material

Answer

The ceramic filler content

Question 4

When splinting periodontally involved teeth, the most important biomechanical requirement is:

Accepted Answer

Ensuring the splint does not interfere with oral hygiene access

Answer

Using rigid metal splints exclusively

Answer

Increasing vertical dimension

Answer

Covering all surfaces with composite

Question 5

In caries risk assessment, which factor contributes most significantly to high caries risk categorisation?

Accepted Answer

Presence of active white spot lesions and high sucrose intake

Answer

Age over 40

Answer

Use of fluoride toothpaste

Answer

Well-controlled type 2 diabetes

Question 6

Which type of tooth movement is most energy-efficient and causes the least root resorption in orthodontics?

Accepted Answer

Tipping

Answer

Extrusion

Answer

Bodily movement

Answer

Torque