421. Acute osteomyelitis is most frequently caused by which of the following microorganisms?
A. Gonococcus
B. Enterococcus
C. Streptococcus
D. Staphylococcus
422. Periapical cyst is usually preceded by:__________?
A. Periapical granuloma
B. Periodontal abscess
C. Periapical abscess
D. All of the above
423. Chronic hyperplastic pulpitis is:__________?
A. Necrotizing
B. Suppurative lesion
C. proliferation of a chronically inflamed pulp
D. Also called as phoenix abscess
424. A tooth with a 3 month history of pain, which was worse when hot liquid were in mouth. After extraction, the tooth was split open. The pulp chamber was completely filled with pus. A few remnants of pulp tissue were found in apical end. The condition is:__________?
A. Acute partial pulpits
B. Acute total pulpits
C. Suppurative pulpitis
D. Strangulation of pulp
425. Focal sclerosing osteomyelitis is:__________?
A. Due to excessive periosteal bone formation
B. An extremely painful condition
C. Due to low grade chronic infection
D. A common sequel following sequestrectomy
426. Osteomyelitis begins as an inflammation of:__________?
A. Cortical bone
B. Periosteum
C. Medullary bone
D. periosteum and inner cortex
427. The earliest radiographic sign of osteomyelitis is___________?
A. Solitary or multiple small radiolucent areas
B. Increased granular radiopacity
C. Blurring of trabecular outlines
D. Formation of sequestrum appearing as radiopaque patches
428. The most common organism involved in a periapical abscess is:__________?
A. Strep. Pyogenes
B. Strep. viridans
C. β hemolytic streptococci
D. Non hemolytic streptococci
429. The main causative agent of Ludwig’s angina is:__________?
A. Anaerobic streptococci
B. Aerobic streptococci
C. Staphylococci
D. Legionella infection
430. Which of the following periapical conditions is often associated with a vital pulp?
A. Apical cyst
B. Apical scar
C. Condensing osteitis
D. Chronic apical periodontitis