Dentosphere : World of Dentistry

 # The health promotional phase in public health is between the years: A. 1880-1920 B. 1920-1960 C. 1960-1980 D. 1980-2000 The correct answer is B. 1920-1960. Four phases of public health have been recognized: A. Phase one: Disease Control Phase (1880-1920) The 19th century Public Health- matter of sanitary legislation and sanitary reform, safe water supply and waste disposal.  B. Phase Two: Health promotional phase (1920-1960) At the beginning of the 20th century, the concept of health promotion emerged. As a result, in addition to disease control activities, one more goal was initiated. e.g. Maternal and child health, School health, mental health, occupational health and rehabilitation services. C. Phase Three: Social Engineering phase (1960-1980) Chronic conditions such as cancer, Diabetes mellitus (DM), cardiovascular diseases (CVD), and alcoholism, drug addiction occurred. These chronic health problems could not be tackled by the traditional approaches to public health i....

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 # In heat cure denture base acrylic resins, the monomer is: A. Methyl methacrylate B. Ethyl methacrylate C. Methyl ethyl methacrylate D. Polymethyl methacrylate The correct answer is A. Methyl methacrylate. Most polymethyl methacrylate resin systems include powder and liquid components. The powder consists of prepolymerized spheres of polymethyl methacrylate and a small amount of benzoyl peroxide, termed the initiator, which is responsible for starting the polymerization process. The liquid is predominantly nonpolymerized methyl methacrylate monomer with small amounts of hydroquinone. Hydroquinone is added as an inhibitor, which prevents undesirable polymerization or “setting” of the liquid during storage. Inhibitors also retard the curing process and thereby increase working time. Ref: Phillip’s Science of Dental Materials, 12th Edition, Page no. 475 CLICK HERE FOR MORE MCQs   

 # In adults seeking orthodontic treatment with esthetic appliances the following may be choices EXCEPT: a) Lingual orthodontics  b) Ceramic brackets c) Clear aligner therapy d) Titanium brackets The correct answer is D. Titanium brackets. All other options are considered esthetic orthodontic appliances because they are either not visible or highly perceptible. Titanium brackets display metal and are not esthetic. Clear aligner therapy can be used for minor orthodontic corrections and can be preferred by patients due to esthetics and ease of use.  CLICK HERE FOR MORE MCQs

 # A child is brought to the clinic with complaint of irregular teeth. The maxillary central incisor is rotated in an otherwise normal occlusion. What should the next step be? a) Check for supernumerary teeth b) Resection of supracrestal fibers c) Exert a couple on tooth d) Fixed orthodontic appliances given   The correct answer is a. Check for supernumerary teeth. Unerupted mesiodens and the presence of thick labial frenum between the central incisors are common causes of midline diastema. Before attempting to close midline diastema, radiographs should be taken to rule out supernumerary teeth as the cause of diastema. CLICK HERE FOR MORE MCQs

 # Which of the following agents is approved as an immersion sterilant? A. Ethyl alcohol B. Glutaraldehyde C. Iodophors D. Sodium Hypochlorite The correct answer is B. Glutaraldehyde. Immersion sterilants are agents used to sterilize instruments by dipping them in their solution.  Glutaraldehydes are used as a disinfectant and in fixing biological tissues for light and electron microscopy. This is the most widely used immersion sterilant.  Glutaraldehyde, sold under the brandname Cidex and Glutaral among others, is a disinfectant, medication, preservative, and fixative. As a disinfectant, it is used to sterilize surgical instruments and other areas of hospitals.  As a medication, it is used to treat warts on the bottom of the feet. Glutaraldehyde is applied as a liquid. CLICK HERE FOR MORE MCQs

 # Endodontically treated teeth: A. Decay and breakdown rapidly B. Require no special design or restoration C. Are weak and can fracture due to occlusal forces D. Are more stronger The correct answer is C. Are weak and can fracture due to occlusal forces. Routinely, teeth that have had endodontic treatment are weak and subject to fracture from occlusal forces. These teeth require restorations designed to provide protection from this injury. This particularly applies to posterior teeth, which are subjected to greater stress. Ref: Sturdevant’s Art and Science of Operative Dentistry, 7th Edition, Page no e125 CLICK HERE FOR MORE MCQs