Methods: The study design implies a cross-over after 6 months (change of quadrant, artificial gingivitis) at a total duration of 12.5 months. Saw-cut models of 20 probands were made after applying either the double-chord-technique (roeko Retracto, impregnated, size 1&2, Coltène/Whaledent, Germany) or an aluminum-chloride containing paste (Expasyl, PierreRolland, France) for soft-tissue management on the palatal aspect of the upper premolars. Teeth in the contralateral quadrant served as control. Impressions were made before each intervention (reference), after three and six months (follow-up). Probands received professional tooth cleaning before baseline impression, before refraining from tooth brushing for artificial gingivitis and immediately after the second intervention. After digitizing (digiSCAN, AmannGirrbach, Germany), follow-up data was aligned to baseline data for analysis (geomagic studio and qualify 9.0, geomagic Inc., USA). Statistical analysis was performed with SPSS Statistics 17.0 (SPSS Inc., USA).
Careful use of two different procedures for soft-tissue management did not cause permanent gingival recession. A mild artificial gingivitis did not have a negative influence.
Sponsoring: 3M ESPE
Keywords: Clinical trials, Dental materials, Gingivitis, Periodontium-gingiva and Prosthodontics