Abstract
The circadian rhythm regulates many physiological human health and disease processes. The central circadian clock is located in the suprachiasmatic nucleus in the hypothalamus and controls a whole range of circadian clock genes. During bone remodeling, circadian rhythm gene expression was observed in osteoblasts and osteoclasts. Moreover, circadian rhythm genes are an essential part of the circadian network in the osseointegration of titanium implants. Namely, titanium biomaterials significantly affect the expression of the circadian clock gene in the oral cavity and thus regulate the establishment of osseointegration. In addition, vitamin D has potential practical implications for patients with dental implants because sufficient vitamin D levels before surgery improve the osseointegration process. Also, the hormone melatonin, whose production depending on the circadian rhythm, affects bone homeostasis. Therefore, melatonin affects bone formation and could serve as a regenerative agent by increasing the process of osseointegration. This review highlights the impact of dental implants on circadian rhythm and osseointegration.
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