Primary Dentition or Decidious Teeth.

Deciduous teeth, otherwise known as reborner teeth, baby teeth, temporary teeth and primary teeth, are the first set of teeth in the growth development of humans and many other mammals. In some Asian countries they are referred to as fall teeth as they will eventually fall out, while in almost all European languages they are called milk teeth. They develop during the embryonic stage of development and erupt—that is, they become visible in the mouth—during infancy. They are usually lost and replaced by permanent teeth, but in the absence of permanent replacements, they can remain functional for many years.

Description :

Deciduous teeth start to form during the embryo phase of pregnancy. The development of deciduous teeth starts at the sixth week of development as the dental lamina. This process starts at the midline and then spreads back into the posterior region. By the time the embryo is eight weeks old, there are ten areas on the upper and lower arches that will eventually become the deciduous dentition. These teeth will continue to form until they erupt in the mouth. In the deciduous dentition there are a total of twenty teeth: five per quadrant and ten per arch. The eruption of these teeth begins at the age of six months and continues until twenty-five to thirty-three months of age. Usually, the first teeth seen in the mouth are the mandibular centrals and the last are the maxillary second molars.

Periodontics - (BDS Final Year March 2011)

PART-A

Q1. Write the most recent classification of the diseases and conditions affecting the periodontium. Discuss the etiology and clinical features of chronic periodontitis. (8 marks)

Q2. Enumerate various techniques for pocket depth reduction. Describe any one procedure in detail. Draw diagram where necessary. (8 marks)

Q3. Write short notes on:- (3+3+3=9 marks)
a. Difference between gingival abscess and periodontal abscess.
b. Etiology of halitosis.
c. Periodontal treatment protocol for HIV patients.

---

PART-B

Q1. Describe in brief the mechanism/s of peeling of gingival epithelium in desquamative gingivitis. (8 marks)