The contact angle between GP surfaces and the sealers was measured using the same optical contact angle (
OCA 20; DataPhysics Instruments GmbH, Filderstadt, Germany) at room temperature. Following the manufacturer’s instructions, an epoxy resin-based sealer (Endoresin cement; Endogal, Sarria, Lugo, Spain) and a bioceramic sealer (
AH Plus Bioceramic; Dentsply Sirona, Ballaigues, Switzerland), were tested in conventional and bioceramic GP surfaces. One set of parameters (time and power) for each plasma treatment gas, that might be related to a better adhesion, such as roughness and surface free energy, will be chosen to the experimental assay.
After one drop of sealer (0.1 mL) was deposited on the GP surfaces with a 0.5 mL BD ultrafine syringe. Ten drops of the same sealer were evaluated for each plasma treatment (n = 10), being that the control group (n = 10) included samples not subjected to plasma treatment.
The sealer wettability was followed up for 1 min, using the next Eq. (
2) to evaluate the sealer wettability (SW)
17 (link):
Ferreira I., Lopes C., Rodrigues M.S., Rodrigues P.V., Castro C., Braga A.C., Lopes M., Vaz F., Pina-Vaz I, & Martín-Biedma B. (2023). Functionalization of gutta-percha surfaces with argon and oxygen plasma treatments to enhance adhesiveness. Scientific Reports, 13, 12303.