Coronal microleakage of two intraorifice bioceramic barriers in single-rooted premolars: In vitro study

Coronal microleakage compromises the longevity of root-filled teeth. Intra-orifice barriers are used to reduce coronal ingress, but comparative performance among bioceramics remains uncertain. This study aimed to evaluate the coronal microleakage of two bioceramic materials, NeoPutty and mineral trioxide aggregate (MTA) Plus, used as intraorifice barriers in extracted human single-rooted premolars.

This randomized controlled in vitro experimental study included 50 extracted human single-rooted premolars, which were randomly allocated into four groups: two experimental groups (NeoPutty and MTA Plus; n = 20 each) and two control groups (positive and negative controls; n = 5 each). Following root canal preparation and obturation, intraorifice barriers were placed, and the samples were immersed in Rhodamine B dye for 48 h. The teeth were then sectioned buccolingually, and dye penetration was observed under a stereomicroscope (×16). Data were analyzed using an independent samples t-test with a significance level of P < 0.05.

The mean dye penetration with standard deviation (SD) was 5.49 (1.72) mm for NeoPutty and 5.21 (1.11) mm for MTA Plus; the difference was not statistically significant (NeoPutty - MTA Plus = 0.275 mm; 95% confidence interval [CI], -0.651-1.201; t = 0.60; P = 0.55).

Both NeoPutty and MTA Plus showed similar coronal sealing effectiveness as intraorifice barriers in premolars. These results support the use of either material to enhance the coronal seal. Further studies incorporating aging protocols and alternative leakage models are recommended.