G.V. Black's Classification of Tooth Preparations / Cavity Preparations

Based on anatomical location of carious lesion, Greene Vardiman Black (G.V. Black) classified tooth preparations into five different classes. Later an additional class, class VI was also added. Class I refers to pit and fissure lesions, whereas all other classes are smooth surface lesions.

G.V. Black's Classification of Tooth Preparations

Class I	All pit and fissure preparations. It Includes: ➤ occlusal surfaces of premolars and molars, ➤ occlusal two-thirds of the facial and lingual surfaces of molars, and ➤lingual surfaces of maxillary incisors
Class II	Preparations involving the proximal surfaces of posterior teeth  (i.e. Premolars and Molars)

Dentist

Who is a Dentist / Dental Surgeon ?

A dentist is a person who is licensed by the nation or state's licensing body to practice dentistry independently. He can either run a private practice or work as a government employee or an employee in other's clinic. A dentist can examine and diagnose the disease of your oral cavity, perform restorations, rectify maloccluded teeth by the use of removable and fixed orthodontic appliances, extract your tooth, provide partial or complete / removable dental prostheses, etc. The dentist deals not only with the teeth, the rest of the soft tissues like tongue, palate, buccal and labial mucosa are also dealt by the dentist. Extra-oral lesions, swellings, and tumors of the head and neck region too come to the attention of the dentist first. Some facial reconstruction surgeries, surgical correction of cleft lips and palates, implants,etc. all come under the duties of a dentist or dental surgeon.

MCQs on Oral Histology - Salivary Glands Part 2

# Myoepithelial cells are present in:
A. Striated duct
B. Intercalated duct and terminal duct
C. Serous cells
D. Mucous cells

# Carmalt's glands are:
A. Major salivary glands
B. Minor salivary glands(Retromolar)
C. Minor salivary glands (lingual)
D. Taste buds

MCQs on Oral Histology - Salivary Glands Part 1

# The normal pH of saliva is about:
A. 5.5
B. 9.5
C. 7.5
D. 8.5

# Of the total amount of saliva secreted by all the salivary glands, about 60% is secreted by :
A. Parotid glands
B. Sublingual glands
C. Submandibular glands
D. None of the above