Calcium phosphate coating on dental composite resins by a laser-assisted biomimetic process

Abstract

ObjectivesDental composite resins with better biocompatibility and osteoconductivity have been sought in endodontic treatments. This study aimed to develop a technique to produce the osteoconductive resin surfaces through calcium phosphate (CaP) coating using a laser-assisted biomimetic (LAB) process.MethodsLight-cured, acrylic-based composite resins were used as substrates. The resin substrate was subjected to a LAB process comprising Nd:YAG pulsed laser irradiation in a supersaturated CaP solution. The LAB-processed substrate was immersed for 3 days in a simulated body fluid (SBF) for the preliminary osteoconductivity assessment.ResultsAfter irradiation for 30 min, the resin surfaces were partly coated with a newly formed CaP layer. The coating layer contained hydroxyapatite as the main crystalline phase and the coating coverage depended on the laser wavelength and the type of resin. The LAB-processed CaP-coated surface exhibited apatite-forming ability in SBF.ConclusionsLAB process is effective for CaP coating on light-cured dental composite resins and improving their osteoconductivity.Clinical significanceThe LAB process is a potential new tool to create a cementum-like osteoconductive surface on dental composite resins.

Laser-assisted biomineralization on human dentin for tooth surface functionalization

“…Although there are several reports on biomimetic processes assisted by laser irradiation [17,18], they require multiple steps to produce CaP coatings on materials, i.e., a laser-assisted surface modification step followed by a CaP growth/aging step. Until now, the LAB process for one-step CaP coating has been applied to polymeric [14,19,20], ceramic [21,22], metallic [23,24], and ceramic-polymer composite [25] materials.…”

Antibacterial tooth surface created by laser-assisted pseudo-biomineralization in a supersaturated solution

“…In the LAB process, a substrate surface is irradiated for a few tens of minutes with low-energy Nd:YAG pulsed laser light in a supersaturated calcium phosphate (CaP) solution (referred to as CP solution [26,27]). This process has enabled facile (< 30 min) and area-specific CaP coating on various artificial materials under standard ambient pressure and temperature [26,[28][29][30][31][32][33][34][35]. More recently, we applied this LAB process to a substrate of human dentin and demonstrated rapid pseudo-biomineralization, i.e., apatite formation, on the surface [36].…”

Technique for simple apatite coating on a dental resin composite with light-curing through a micro-rough apatite layer

“…In conventional approaches described above, resin composites have been functionalized by modifying their components (monomers, fillers, etc.). Recently, Nathanael et al proposed another approach based on surface functionalization of cured resin composites through apatite coating [15]. In their technique, the surface of a cured resin composite was coated with apatite via pulsed laser irradiation in a supersaturated calcium phosphate (CaP) solution.…”

“…Although there are various apatite coating techniques, such as plasma spraying, sputtering, pulsed laser deposition, and biomimetic processes [16,17], few techniques meet the requirements (e.g., facileness and coating-area specificity) for chair-side apatite coating of a restored root surface. Even with the Nathanael's coating technique applied to resin composites [15], an additional laser irradiation step is required after the resin curing step. The purpose of the present study is to establish a simple apatite coating technique for a dental resin composite, where the coating is applied simultaneously with light curing.…”