A systematic review and meta-analysis published in The Journal of General Internal Medicine found that periodontal disease increases the risk of coronary heart disease by 24 to 34 percent. One reason might be the presence of harmful bacteria in the mouth, which not only causes gum disease but also promotes systemic inflammation throughout the body.
This article is about the Latin phrase. For the physical theory, see quantum electrodynamics. For other uses, see QED (disambiguation). Q.E.D. (also written QED) is an initialism of the Latin phrase quod erat demonstrandum, meaning what was to be demonstrated, or, less formally, thus it has been demonstrated.
Definition. QA is a set of activities for ensuring quality in the processes by which products are developed. QC is a set of activities for ensuring quality in products. The activities focus on identifying defects in the actual products produced.uality control is usually the responsibility of a specific team that tests the product for defects. Example. Verification is an example of QA. Validation/Software Testing is an example of QC. Statistical Techniques. Statistical Tools & Techniques can be applied in both QA & QC.