KCET -2012

2. Clogging of abrasive wheel with debris, causing reduction of abrasive action is called

a. Blinding
b. buffing
c. dressing
d. truing

ANS - a

Truing is done to improve the concentricity of burs by shaping stone against a rotating instrument. It is a procedure where instrument is run against a harder abrasive block until it rotates without eccentricity. Truing improves cutting efficiency.

Buffing - process of polishing the occlusal surface of cast metal using soft bristle disc and tripoli or Bar buffing compound

Dressing- The shaping of abrasive to correct its size, shape and remove clogged debris, done using a dressing stone.


Blinding -  The process of clogging of an abrasive during work. It reduces efficiency. Dressing is done to remove abrasive blinding.


Grit -  term to describe size of abrasive.

Dont confuse this blinding with blinding techniques in epidemiology...

KCET - MDS - 2012

1. Merkel cells are found in which of the following tissue?
a.epidermis
b. papillary layer of dermis
c. reticular layer of dermis
d. hypodermis

ANS - A
Merkel cells are located in the deeper layers of the epithelium, harbor nerve endings and are connected to other cells by desmosomes, they have been identified as tactile receptors.