Vesicles rupture at followed by pseudo membrane formation on a 3 year old child

 # A 3 year old patient has extensive vesicles on lip, tongue, oral mucous membrane. After 2-4 days vesicles rupture at followed by pseudo membrane formation and also some dermal lesions are seen. What will be the diagnosis? 

a. Herpetic stomatitis 

b. Erythema multiforme 

c. ANUG 

d. Steven-Johnson Syndrome 

The correct answer is B. Erythema multiforme. 

Erythema multiforme (EM) is acute, self‐limited, inflammatory mucocutaneous disease that manifests on the skin and often oral mucosa, although other mucosal surfaces, such as the genitalia, may also be involved. It represents a hypersensitivity reaction to infectious agents (majority of cases) or medications. In general, EM is classified as EM minor if there is less than 10% of skin involvement and there is minimal to no mucous membrane involvement, whereas EM major has more extensive but still characteristic skin involvement, with the oral mucosa and other mucous membranes affected.

Three inherent characteristics of a radiographic film:

 # Three inherent characteristics of a radiographic film:

a. density, distortion, contrast 

b. sharpness, contrast, density 

c. definition, sharpness, penumbra 

d. distortion, detail, sharpness 

The correct answer is: B. Sharpness, contrast, density.

Image quality describes the subjective judgment by the clinician of the overall appearance of a radiograph. It combines the features of density, contrast, latitude, sharpness, resolution, and perhaps other parameters.

Use of intensifying screen is:

 # Use of intensifying screen is:

a. to decrease scattered radiation 

b. to decrease patient radiation 

c. to increase contrast 

d. to increase number of photons striking the anode filament 

The correct answer is B. To decrease patient radiation.

The presence of intensifying screens creates an image receptor system that is 10 to 60 times more sensitive to x-rays than the film alone. Consequently, the use of intensifying screens substantially reduces the dose of x radiation to the patient. Intensifying screens are used with films for virtually all extraoral radiography, including panoramic, cephalometric, and skull projections.

Digital radiography differs from conventional in:

 # Digital radiography differs from conventional in:

a. X-rays not used 

b. Rays other than X-rays are used 

c. Radiation receptors are different 

d. No hard copy is formed 

The correct answer is C. Radiation receptors are different.

Digital image receptors encompass numerous different technologies and come in many different sizes and shapes. Numerous different and sometimes confusing names are in use to identify these receptors in medicine and dentistry. The most useful distinction is that between two main technologies: (1) solid-state technology and (2) photostimulable phosphor (PSP) technology. Although  solid-state detectors can be subdivided further, these detectors have in common certain physical properties and the ability to generate a digital image in the computer without any other external device.

In medicine, the use of solid-state detectors is referred to as digital radiography. In dentistry, intraoral solid-state detectors are often called sensors. The other main technology, PSP, consists of a phosphor-coated plate in which a latent image is formed after x-ray exposure. The latent image is converted to a digital image by a scanning device through stimulation by laser light. This technology is sometimes referred to as storage phosphor on the basis of the notion that the image information is temporarily stored within the phosphor. Other times the term image plates is used to differentiate them from film and solid-state detectors. The use of PSP plates in medical radiology is referred to as computed radiography.