Author Archives: meifong

White Lesion Of the Oral Mucosa Part 2


Horizontal streak on the buccal mucosa at the level of the occlusal plane extending from the commissure to the posterior teeth
Common finding
Most likely associated with pressure, frictional irritation, or sucking trauma from the facial surfaces of the teeth
Present in about 13% of the population in one study.

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Bacterial Infection of the Oral Cavity Part 1

Most common infection, most are transient with few untoward sequelae.

Some are life threatening (e.g., Meningoccus, Diphtheria)

Severe, recurrent, disseminated or persistent lesions occur in Immunocompromised, organ transplant or AIDS.

Bacterial infections are diagnosed on Clinical grounds, supported by smears, culture, testing for immune responses (Serology) & examining for nucleic acids.

Antibacterial drugs can be effective therapy but, resistance can be a problem (e.g.. MRSA)

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Radiographic Accessories Part 4

The material chosen must attenuate principally by means of photoelectric effect in the photon energy range being dealt with in order to discriminate against low energy photons
The material must not have an absorption edge close to the energies of the photons that it is desired to use
The thickness of the material must not be too small – it should be uniform
Too thin might produce pin holes which might produce completely unfiltered beams

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Radiographic Accessories Part 3

In order to prevent the shadows cast onto the film by the grid from interfering with visualization of diagnostic detail, certain principles must be followed:
the lead should be as thin as possible to be consistent with adequate absorption of scattered radiation. The thinner the lead, the narrower the shadow it will produce on the film and the less visible it will be to the eye.
Also, the thinner it is the less absorption of primary radiation will be in the grid. BUT it must be noted that adequate absorption of scattered radiation is the function of the grid and lead must be thick enough to provide this function.

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