Inclusion Criteria:  lack of general diseases good oral hygiene healthy periodontium - API ratio&lt;15%, BOP&lt;10% no loss of clinical attachment in the examined areas (CAL=0) no use of drugs no addictions, especially cigarette smoking no use of mobile prosthetic restorations and orthodontic appliances no contraindications for X-ray examinations  Exclusion Criteria:  general diseases poor oral hygiene non healthy periodontium - API ratio&gt;15%, BOP&gt;10% loss of clinical attachment in the examined areas (CAL&gt;1) use of drugs that could influence the structure of the periodontal tissues addictions, especially nicotinism use of mobile prosthetic restorations and orthodontic appliances contraindications for X-ray examinations