Dentosphere : World of Dentistry

 # Paget’s test is done in the examination of: A. A small swelling B. Serum calcium C. Urine analysis for alkaline phosphatase D. Cytologic smear The correct answer is A. A small swelling. Paget's test is done for small swellings to know the consistency (cystic/solid). The centre and peripheries are palpated with index finger. Cystic swelling feels softer at centre than periphery whereas solid swelling feels firmer at center than periphery.

 # Which of the following is a general property of biofilms?  a. Susceptible to host defenses.  b. Limited habitat range.  c. Open architecture. d. Reduced virulence The correct answer is C. Open architecture. The close relationships between the architecture of a biofilm and its functional properties emphasizes the need to better describe and understand cell behavior, from single cell to multicellular scale, during biofilm structure development and maturation. Recent technological advances in methodologies including imaging and microscopy, molecular techniques, and physico-chemical assays, enabled the development of novel approaches dedicated to biofilm studies (Azeredo et al., 2017). The possibility to observe biofilm using high resolution and non-destructive methods now allows investigating the dynamics of multicellular structure development and the fate of each of its individual cellular components in parallel. For instance, the key architectural transitions and a...

# Boiling point of methyl methacrylate is: A. Greater than B.P of water  B. Lesser than B.P of water  C. Equal to BP of water  D. Is at normal room temperature  The correct answer is A. Greater than Boiling Point of Water.  Methyl methacrylate (MMA) is an organic compound with the formula CH2=C(CH3)COOCH3. This colorless liquid, the methyl ester of methacrylic acid (MAA), is a monomer produced on a large scale for the production of poly(methyl methacrylate) (PMMA). Melting point : −48 °C (−54 °F; 225 K) Boiling point : 101 °C (214 °F; 374 K)

 # The oxygen flush system provides a higher flow of oxygen of ________ L/min when the patient’s need for oxygen is greater than the amount the breathing circuit can provide.  a) 25-50  b) 35-75  c) 55-95  d) 65-105  The correct answer is B. 35-75. Many anesthesia providers use the oxygen flush valve daily especially in those cases where the face mask fit is not optimal during the induction. When an emergency occurs it is comforting to know where a supply of oxygen is readily located, how much can be delivered, and that a flow is available despite the anesthesia being lifted on or off. The oxygen flush can be used even when the anesthesia machine is not turned on and will operate in its regular fashion. It delivers oxygen straight from the pipeline or cylinder regulator at 45-50 psig (Pounds per square in gauge). The flow rate will be between 35-75 L/min. 

 # Acetone breath is a feature of: A. Sinusitis B. Renal disease C. Liver disease D. Diabetes mellitus The correct answer is D. Diabetes mellitus. Diabetic ketoacidosis (DKA) is a potentially life-threatening complication of diabetes mellitus. Signs and symptoms may include vomiting, abdominal pain, deep gasping breathing, increased urination, weakness, confusion and occasionally loss of consciousness. A person's breath may develop a specific "fruity" smell. Onset of symptoms is usually rapid. People without a previous diagnosis of diabetes may develop DKA as the first obvious symptom. DKA happens most often in those with type 1 diabetes but can also occur in those with other types of diabetes under certain circumstances. Triggers may include infection, not taking insulin correctly, stroke and certain medications such as steroids. DKA results from a shortage of insulin; in response, the body switches to burning fatty acids, which produces acidic ketone bodies. DKA is typi...

 # Glass ionomer cement was introduced by Wilson and Kent in: a.1969 b.1972 c.1896 d.1989 The correct answer is B. 1972. Glass ionomer cements are adhesive tooth colored anticariogenic restorative materials which were originally used for restorations of eroded areas. Current glass ionomers have been modified to allow a wider application. These cements evolved from a general dissatisfaction with silicate cements. The first usable glass ionomer system was formulated in 1972 by Wilson and Kent and was known as ASPA (alumino silicate polyacrylic acid). Subsequently great improvements were made and today these materials are very popular and widely used.

 # Crepitus will be seen in the tissues surrounding an infection by: A. Staphylococcus B. Streptococcus C. Clostridium tetani D. Clostridium perfringes The correct answer is D. Clostridium perfringes.  ■ Clostridium perfringens causes gas gangrene or myonecrosis.  ■ Gas gangrene is characterized by skin colour change from pallor to bronze/purple discoloration and the skin is tense and exquisitely tender.  ■ Gas in the tissues may be obvious with crepitus on clinical examination or visible on radiograph.  ■ Surgical debridement, antibiotic therapy with high-dose I.V penicillin, clindamycin and metronidazole and hyperbaric oxygen therapy are used for treating gas gangrene [Note: Hyperbaric oxygen therapy is also used for osteoradionecrosis and chronic osteomyelitis].  ■ Cl. tetani causes tetanus and cl. difficile causes pseudomembranous colitis.