Dentosphere : World of Dentistry

 # Which of the following factor result in film appearing very  light? A. Under exposure B. Over development C. Developing solution too hot D. Unsafe illuminations in dark room The correct answer is A. Underexposure. CAUSE S OF LIGHT RADIOGRAPHS Processing Errors - Underdevelopment (temperature too low; time too short; thermometer inaccurate) - Depleted developer solution - Diluted or contaminated developer - Excessive fixation Underexposure - Insufficient mA - Insufficient kVp - Insufficient time - Film-source distance too great - Film packet reversed in mouth  Reference: Oral Radiology Principles and Interpretation, 7th Edition, White and Pharoah, Page no 80 CLICK HERE FOR MORE MCQs

 #  Initial clinical sign of juvenile periodontitis: A. Pathological tooth migration and midline diastema B. Tooth mobility and bone loss C. Gingival enlargement and pus formation D. Pain and bleeding The correct answer is A. Pathological tooth migration and midline diastema. Pathologic migration may continue after a tooth no longer contacts its antagonist. Pressures from the tongue, the food bolus during mastication, and the proliferating granulation tissue provide the force. Pathologic migration is also an early sign of localized aggressive periodontitis. Weakened by the loss of periodontal support,the maxillary and mandibular anterior incisors drift labially and extrude, thereby creating diastemata between the teeth. Reference: Carranza's Clinical Periodontology, 12th Edition, Page no: 306 CLICK HERE FOR MORE MCQs

 # In initial stages, treatment of acute necrotizing ulcerative gingivitis without systemic involvement is: A. Thorough debridement and H2O2 mouthwashes B. Penicillin therapy C. Metronidazole and penicillin therapy D. Gingivectomy and gingivoplasty The correct answer is A. Thorough debridement and H2O2 mouthwashes. The oral cavity is examined for the characteristic lesion of NUG, its distribution, and the possible involvement of the oropharyngeal region. Oral hygiene is evaluated, with special attention to the presence of pericoronal flaps, periodontal pockets, and local factors (e.g., poor restorations, distribution of calculus). Periodontal probing of NUG lesions is likely to be very painful and may need to be deferred until after the acute lesions are resolved. The goals of initial therapy are to reduce the microbial load and remove necrotic tissue to the degree that repair and regeneration of normal tissue barriers are reestablished. Reference: Carranza's Clinical Periodontolog...

 # The extraoral radiograph that best shows the maxillary sinuses is: A. AP skull B. Lateral skull C. Towne’s view D. Waters’ view The correct answer is D. Waters' view. This technique is useful for the evaluation of maxillary sinuses and it also demonstrates frontal sinuses, ethmoidal sinuses, orbit, zygomaticofrontal suture and nasal cavity. In Waters’ technique the neck is hyperextended enough to place the dense petrosae immediately below the maxillary sinus floor. CLICK HERE FOR MORE MCQs

 # X rays were discovered in the year: A. 1890 B. 1895 C. 1900 D. 1905 The correct answer is B. 1895.  X-radiation is referred to as Röntgen radiation, after the German scientist Wilhelm Conrad Röntgen, who discovered it on November 8, 1895. He named it X-radiation to signify an unknown type of radiation. CLICK HERE FOR MORE MCQs

 Candidiasis is a disease caused by infection with a yeast like fungus, Candida albicans, although other species may also be involved, such as C. tropicalis, C. parapsilosis, C. stellatoidea, C. krusei, C. glabrata, C. pseutropicalis and C. guilliermondii. Candidiasis is the most common opportunistic infection in the world. Its occurrence has surged since the prevalent use of antibiotics, which destroy the normal inhibitory bacterial flora, and immunosuppressive drugs, particularly corticosteroids and cytotoxic drugs. Oral candidiasis or oral thrush usually remain as a localized disease, but on occasion it may show extension to the pharynx or even to the lungs.  Some specific conditions that may predispose a patient to develop oral candidiasis are: ❍ Factors that alter the immune status of the host ❍ Diabetes mellitus ❍ Corticosteroid therapy/hypoadrenalism ❍ Blood dyscrasias or advanced malignancy ❍ Old age/infancy ❍ Radiation therapy/chemotherapy ❍ HIV infection or other imm...

 # Areas anesthetized by the intraoral inferior alveolar nerve block include: A. The body of the mandible B. The inferior portion of the ramus C. Mandibular teeth D. All of the above The correct answer is D. All of the above. Areas Anesthetized by Inferior alveolar nerve block 1. Mandibular teeth to the midline 2. Body of the mandible, inferior portion of the ramus 3. Buccal mucoperiosteum, mucous membrane anterior to the mental foramen (mental nerve) 4. Anterior two thirds of the tongue and floor of the oral cavity (lingual nerve) 5. Lingual soft tissues and periosteum (lingual nerve) Ref: Handbook of Local Anesthesia, Malamed, 6th Edition, Page 227 CLICK HERE FOR MORE MCQs