A 53-year-old man has signs of bruxism (Fig.1 diastema *) and root fracture or RCT failure at #4 (Fig.4 (large PARL *)).  The RCT failure is related to overload of the affected tooth, which is in turn partially due to infraocclusion of the neighboring implant crown (Fig.1 arrows (implant positioning not ideal)) and partially to due to partial edentulism (Fig.2 missing teeth #14 and 18).

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Xin Wei, DDS, PhD, MS 1st edition 03/03/2019, last revision 03/03/2019