First number in the instrument formula indicates:

  # First number in the instrument formula indicates:

A. Length of the blade in centimeters

B. 1/10th of the width

C. Angulation of the blade in degrees

D. Primary cutting edge angle

The correct answer is B. 1/10th of the width.

The complete instrument formula (four numbers) is expressed as the blade width (1) in 0.1-mm increments, cutting edge angle (2) in centigrades, blade length (3) in millimeters, and blade angle (4) in

centigrades.

Reference: Sturdevant's, 2018, Mosby



Nasolabial cyst is thought to arise from:

  # Nasolabial cyst is thought to arise from:

A. Remnant of cell rest of Serres

B. Remnant of cell rest of Malassez

C. Remnant of cell rest of embryonic lacrimal duct

D. Maxillary sinus lining epithelium

The correct answer is C. Remnant of cell rest of embryonic lacrimal duct.

Nasolabial cyst is a very uncommon cyst which forms outside the bone in the soft tissues, deep to the nasolabial fold. It probably arises from the lower end of the nasolacrimal duct and is occasionally

bilateral. It presents over a wide age range, mostly in middle-aged adults, and much more commonly in females. The cysts form soft tissue swellings in the upper lip, distort the nostril and cause pressure resorption of the anterior maxilla if large. 



Buccal cusp of maxillary tooth placed lingual to the lingual cusp of mandibular posterior teeth is referred to as:

 # Buccal cusp of maxillary tooth placed lingual to the lingual cusp of mandibular posterior teeth is referred to as: 

A. Buccal occlusion

B. Buccal non occlusion

C. Lingual non occlusion

D. Lingual occlusion

The correct answer is C. Lingual non occlusion.

The standard probing depth, which requires referral to periodontist, at the time of evaluation of phase 1:

 # The standard probing depth, which requires referral to periodontist, at the time of evaluation of phase 1: 

A. 5 mm 

B. 6 mm 

C. 7 mm 

D. 8 mm 

The correct answer is A. 5 mm.

Pocket depth of 5 and above should be referred to a periodontist.