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NEETMDS - 3 Questions
Radiographic contrast depends on 1) Subject density 2) Focal spot width 3) Collimation 4) None
Radiographic contrast is primarily dependent on the differences in X-ray absorption between adjacent tissues, which is determined by their physical properties, collectively referred to as subject density.A greater difference in subject density results in higher contrast. Focal spot width and collimation affect image sharpness and the area of exposure, respectively,
Transformation toughening of zirconia occurs due to change in phase from: 1) Tertagonal to monoclinic 2) Cubic to tetragonal 3) Monoclinic to tertagonal 4) Austenitic to martensitic
Transformation toughening in zirconia is a mechanism where a crack propagation induces a localized phase transformation from the metastable tetragonal phase to the stable monoclinic phase.
Which of the following is the most accurate to measure the height of the floor of the mouth 1) Using a periodontal probe 2) Use of a special tray 3) Use of periodontal probe and a special tray 4) Using straight probe
Periodontal probe:
A calibrated instrument marked in millimeters.
Used like a miniature ruler to measure intraoral structures such as sulcus depth, attachment levels, and distances.
Alone, it can measure vertical dimensions but may not give the most accurate functional height of the floor of the mouth.
Special tray:
Custom-made tray used in prosthodontics for impression making.
Helps record functional anatomy, including the floor of the mouth.
Alone, it provides a functional impression but lacks precise millimeter calibration.
Combination (periodontal probe + special tray):
The probe provides precise millimeter measurement.
The tray ensures functional accuracy by recording the mouth floor in relation to denture-bearing areas.
Together, they give the most accurate measurement of the floor of the mouth height, which is crucial in complete denture fabrication.
MCQ