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Discuss the role of microorganisms in the aetiology and pathogenesis of periapical disease.

The literature indicates that microorganisms have a critical role in the aetiology and pathogenesis of apical periodontitis. The advancement in microbiological study methods has allowed for the identification of newer species associated with the disease process. At our current understanding, however, the exact roles of specific microorganisms in apical periodontitis are not fully understood but the poly-microbial aetiology of the disease appears to be supported by the literature. The endodontic microbiota is comprised of a subset of microbiota present in the oral cavity, consisting of predominantly anaerobic bacterial species, some fungal and viral species. The pathogenesis of apical periodontitis is essentially the result of a complex interplay between bacterial and host factors, giving rise to a range of presentations depending on the balance of the interaction. The role of endodontic microbiota in the initiation and persistence of apical periodontitis means that the mainstay of endodontic treatment is the elimination of such bacteria. A challenge to the resolution of apical periodontitis after treatment lies in the inadequacy of treatment protocol in completely eradicating the pathogenic species and the inherent ability of certain species to survive the treatment. This issue should be the focus of future research as we continually search for more predictable treatment methods of achieving the resolution of apical periodontitis.

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