Effect of non-thermal plasma treatment on the bonding property of Bio-HPP post and core materials
Year: 2026
Type: article
Abstract: Biological high-performance polymer (Bio-HPP) may represent an ideal alternative material for post and core restorations. However, studies investigating the bonding property of Bio-HPP as a post and core material remain scarce. The purpose of this study was to evaluate the impact of different non-thermal plasma (NTP) treatments on the immediate push-out bond strength (PBS) of Bio-HPP post and core restorations. Forty extracted human single-rooted teeth were endodontically treated and standardized post spaces were prepared. Forty posts which were milled from Bio-HPP disks randomly assigned to 4 groups ( n = 10) according to the surface treatment applied: control (no treatment); Air-NTP (treated with air NTP); O 2 -NTP (treated with oxygen NTP) and N 2 -NTP (treated with nitrogen NTP). NTP treatment was performed at 13.56 MHz and 30 W, with a gas flow rate of 20 sccm for 60 s. Cementation was initiated within 3 min post-discharge to minimize hydrophobic recovery. Additional Bio-HPP disk specimens ( r = 5 mm, h = 2 mm) were used for surface characterization by scanning electron microscopy, water contact angle measurement and X-ray photoelectron spectroscopy. A linear mixed-effects model assessed surface treatment, root canal depth, and their interaction (α = 0.05). Across all groups, the main effect of root canal depth demonstrated a progressive decrease in PBS from the coronal third (16.07 ± 4.98 MPa) to the middle (13.26 ± 4.17 MPa) and apical thirds (10.39 ± 3.67 MPa) ( P < 0.001). Surface treatment and root canal depth significantly affected PBS ( P < 0.001), whereas their interaction was not statistically significant ( P = 0.430). N 2 -NTP (18.19 ± 3.71 MPa) resulted in significantly higher PBS than Air-NTP (13.35 ± 3.16 MPa) or O 2 -NTP (13.41 ± 3.92 MPa) ( P < 0.05). NTP treatment offers a potential approach to improving the immediate bonding of Bio-HPP posts to root canal dentin. The superior bonding property of nitrogen plasma may be attributed to surface chemical modifications in addition to enhanced wettability. The reduced apical bond strength highlights the need to optimize cementation protocols for deeper root canal regions.
Source: BMC Oral Health
Authors: Jun-hong Lin, Lei Jiang, Yu-shan Zhu, Yong-jin Guo
Institution: Fujian Medical University
Language: English
Subfield: General Dentistry
Field: Dentistry
Domain: Health Sciences
Open Access status: gold
Estimated APC paid: $3,190
OpenAlex ID: W7206184769