Academy of Dental Knowledge

National Board of Examinations in Medical Sciences have declared the dates for NEET MDS, NEET PG & other exams. Candidates can check the exam dates below. NEET-MDS 2023: January 8, 2023 DNB/DrNB Final Practical Examination – June 2022: October/November 2022 Foreign Medical Graduate Examination (FMGE) December 2022, Foreign Dental Screening Test (FDST) 2022: December 4, 2022 Formative Assessment Test (FAT) 2022: December 10, 2022 DNB/DrNB Final Theory Examination – December 2022: December 21, 22, 23 and 24, 2022 Fellowship Entrance Test (FET) 2022: January 20, 2023 FNB Exit Examination 2022: February/March 2023 DNB/DrNB Final Practical Examination – December 2022: Feb/March/April 2023 NEET-PG 2023: March 5, 2023 Distribution of subject wise questions in NEET MDS examination. The candidates are being advised to check the details and the updated information at the NBE website - https://natboard.edu.in/ as the dates mentioned are tentative and subject to approval and confirmation.

The harmful effects of the excessive dose of the ionizing radiation can be divided into two types. These are as follows:    Deterministic effects and     Stochastic effects     We shall discuss them one by one in detail.  

In earlier articles on radiography, you studied the effects of ionizing radiation on biological tissues. These effects can be divided into two types- Deterministic and Stochastic. Therefore, the radiation safety becomes of paramount importance white taking a radiograph.  

In this article termed as radiation physics, we shall talk about the ways, the x-rays are produced, the events that occur at atomic level during their production and how can one save oneself and others. Production of X Rays   Electrons that travel from the filament to the tungsten convert part of their kinetic energy into x-ray photons. This phenomenon occurs by the formation of bremsstrahlung and characteristic radiation.  

Radiation Biology  Radiation biology is the study of effects of ionizing radiation on living systems. In this article we shall talk about the harmful effects of ionizing radiation on tissues, how does it occur, and how sensitive different types of cells are? The effects of radiation on the tissues can be divided into 2 broad categories. The  Deterministic and Stochastic effects.  

  Cysts of the Jaws and Neck   Cysts can be classified in three types. Odontogenic Cysts   Periapical (Radicular) Cyst    Lateral Periodontal Cyst    Gingival Cyst of the Newborn    Dentigerous Cyst    Eruption Cyst    Glandular Odontogenic Cyst    Odontogenic  Keratocyst     Calcifying Odontogenic Cyst    Nonodontogenic Cysts   Globulomaxillary  Lesion    Nasolabial Cyst    Median Mandibular Cyst    Nasopalatine Canal Cyst    Pseudocysts   Aneurysmal Bone Cyst    Traumatic (Simple) Bone Cyst    Static Bone Cyst (Stafne’s Bone Defect)    Focal Osteoporotic Bone Marrow   Defect    Soft Tissue Cysts of the Neck    Branchial Cyst/ Cervical Lymphoepithelial   Cyst   

A cyst is defined as “an epithelial lined pathologic cavity”. The periapical/radicular cyst is an odontogenic cyst. The classification of the cysts can be seen HERE . I t is important to read for ADC Exams or NEET MDS purpose. Periapical/Radicular cyst Periapical cysts are inflammatory cysts. Their epithelial lining originates from the odontogenic epithelium of the tooth buds that remains within periodontal ligaments (epithelial rests of Malassez) after completion of tooth maturation. Due to inflammatory response, the epithelial rests of Malassez start proliferating and provide cystic lining.

Dentigerous (Follicular) Cysts are the second most commonly occurring odontogenic cysts after periapical cyst and the most common developmental cysts of the jaws. By definition, a dentigerous cyst is attached to the tooth cervix (enamel-cementum junction) and encloses the crown of the unerupted tooth. Photograph1: Dentigerous cyst surrounding the crown of right mandibular third molar and going upward in ascending ramus. [1] Etiology and Pathogenesis of Dentigerous Cyst   A dentigerous cyst originates  from the  enamel organ remnant or reduced enamel epithelium. The expansion of the dentigerous cyst is related to epithelial proliferation, release of bone-resorbing factors, and an increase in cyst fluid osmolality.   Clinical Features of Dentigerous Cyst   Dentigerous cysts are most commonly seen associated with third molars and maxillary Canines. The peak incidence of dentigerous cysts occurs between twenty to 40 ...