The Oac Problem

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When an OAC is created, it allows the flow of food, smoke or fluid from the mouth into the nose. Not just these
maxillary sinusitis

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, which depending on how long the
acute /

The Aoc Problem

Predict the major substitution products of the following reaction. Br H Na. OAc HOAc Use the wedge/hash bond tools to indicate stereochemistry where it exists. If there is more than one major product possible, draw all of them. Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Mixtures of a weak acid and its conjugate base, such as HOAc and the OAc - ion, are called buffers. The term buffer usually means 'to lessen or absorb shock.' These solutions are buffers because they lessen or absorb the drastic change in pH that occurs when small amounts of acids or bases are added to water.

chronic maxillary sinusitisThe pac problem

The Pac Problem

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Causes of OAC’s:
The vast majority of OAC'sOac are created when upper molars and premolars are removed (almost 50%), tumours
osteomyelitis) (11%), operations to access the maxillary sinus (Caldwell-Luc
procedures) (7.5%), trauma (7.5%), dentigerous cysts (3.7%), correction of septal perforations (3.7%),
disease (HIV-related periodontitis) or tooth-tip infections (chronic apical infection).
Predictive Factors:
As a very broad generalisation, the following may be thought to predispose to an OAC being formed:
  • Proximity of sinus floor / tuberosity
  • Thickened tooth cement (hypercementosis) / tooth fused to jaw bone (ankylosis)
  • Infected teeth / long-standing decay
  • Marked periodontitis / gum disease
  • Lone-standing
  • Previous history of OAC’s.