The shape of an implant crown has a significant influence on how well it can be kept clean using home oral hygiene, and concave crown shapes appear to be easier to clean; it also seems that the underside of an implant crown in the molar area is easiest to access with dental floss.

Factors that can be categorised as a poor lifestyle, and primarily also a combination thereof, significantly increased the number of residual pocket probing depths with ≥ 6 mm and significantly reduced the likelihood of attaining the desired treatment outcome in periodontitis patients following non-surgical periodontal treatment (treatment step 1 and 2).

Commonly used definitions for successful periodontal treatment are extremely difficult to achieve, but are nevertheless associated with a lower rate of tooth loss; however, the tooth loss rate in patients who regularly attend supportive periodontal treatment sessions is generally very low.

Biofilm accumulation is the main aetiological factor in the development of peri-implant diseases; plaque control and supportive implant therapy are therefore crucial in preventing peri-implant diseases.