Dentosphere : World of Dentistry

# Elevators should not be used to remove palatal root of an: A. Upper incisor B. Upper canine C. Upper premolar D. Upper molar The correct answer is D. Upper molar.  - Elevators should not be used to remove the palatal root of an upper molar. - The buccal wall of socket does not form satisfactory fulcrum and can be crushed by the elevating force.  - Furthermore, there is always the danger of forcing the root into antrum. - The palatal root must be seen clearly, which usually implies the removal of both buccal roots and if necessary some surrounding bone, which can be done with a bur. - Gentle dislocation with a narrow coupland chisel or rotation with upper root forceps should deliver the root. CLICK HERE FOR MORE MCQs

The  radix entomolaris  is an additional root in human's mandibular molar  teeth. The human mandibular teeth have two roots usually. In rare cases, however, a root may develop between the  distal  and the mesial  roots which is called entomolaris, if it is located lingual  to the tooth. Such a phenomenon is named radix paramolaris in case an extra root is buccal  to a molar tooth.  It is important to remember that an extra root can appear both in the first and second molars. Three roots on mandibular molar, radix entomolaris Radix entomolaris on a mandibular left first molar Mandibular molar three roots, Radix Entomolaris Radix entomolaris, apical view

# A straight elevator is properly used to advantage when the: A. Adjacent tooth is the fulcrum B. Tooth is isolated C. Interdental bone is fulcrum D. Adjacent tooth is not to be extracted The correct answer is C. Interdental bone is fulcrum. Straight elevator (Coupland, London Pattern) is the most commonly used. Usually used to luxate and elevate mandibular third molar and when multiple extractions are needed. It is not recommended in upper arch. This utilizes principle of lever mechanism. Alveolar crest acts as fulcrum. Adjacent teeth should never be used as fulcrum. CLICK HERE FOR MORE MCQs

# Teeth in line of fire means: A. Teeth in the area of planned therapeutic radiation B. Teeth in the line of fracture C. Teeth within the cancerous region D. None of the above The correct answer is A. Teeth in the area of planned therapeutic radiation. CLICK HERE FOR MORE MCQs

# Epsilon aminocaproic acid (EACA) is one of the agents useful in the treatment of haemophilia A. Mechanism of action of EACA is: A. It is rich in factor VIII, which is deficient in hemophilia B. Antifibrinolytic activity C. It accelerates the coagulation process which is delayed in hemophilia D.By unknown mechanism The correct answer is B. Antifibrinolytic activity. The main action of epsilon aminocaproic acid (EACA) is by its antifibrinolytic activity. EACA is replaced by tranexamic acid, because of its more potent and longer acting properties and less side effects. CLICK HERE FOR MORE MCQs

# Which of the following is not true about hand instruments used in operative dentistry? A. They are generally made of stainless steel B. Nickel-cobalt-chromium is never used in its fabrication C. Carbon steel is more efficient than stainless steel D. It can be made with stainless steel with carbide inserts # Most of the hand cutting instruments are made up of: A. Chromium cobalt B. Carbon steel C. Tungsten carbide D. Stainless steel

# Which of the following is true of caries? A. It is infectious and transmissible B. Non infectious but transmissible C. Multifactorial, transmissible but not infectious D. Not multifactorial, not transmissible # Which of the following microorganisms are associated with the active progression of cavitated lesions? A. Mutant Streptococci B. Streptococcus ferus C. Lactobacilli D. Streptococcus rattus