Effect of water immersion on a dental self-healing and antibacterial resin composite.

Jun-ling WU; Tong LI; Xu Gao; Qiang Zhang; Di Liu; Jian-hua GE; Chuan-jian Zhou

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Effect of water immersion on a dental self-healing and antibacterial resin composite.

Author: Jun-Ling WU ¹ ; Tong LI ² ; Xu GAO ¹ ; Qiang ZHANG ³ ; Di LIU ¹ ; Jian-Hua GE ⁴ ; Chuan-Jian ZHOU ⁴
Author Information

1. Dept. of Prosthodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan 250012, China.
2. Dept. of Conservative Dentistry and Endodontics, Jinan Stomatological Hospital, Jinan 250001, China.
3. Oral Implantology Center, Jinan Stomatological Hospital, Jinan 250001, China.
4. Research Institute of Polymer Materials, School of Materials Science and Engineering, Shandong University, Jinan 250061, China.
Publication Type:Journal Article
Keywords: antibacterial property; microcapsule; resin composite; self-healing; water immersion
MeSH: Anti-Bacterial Agents; Biofilms; Capsules; Composite Resins; Dental Plaque; Humans; Materials Testing; Methacrylates; Water
From: West China Journal of Stomatology 2018;36(5):521-527
CountryChina
Language:Chinese
Abstract: OBJECTIVE:This investigation aimed to develop a novel self-healing and antibacterial dental resin composite. The effects of water immersion on its properties were also evaluated.
METHODS:Microcapsules filled with healing agent of triethylene glycol dimethacrylate were synthesized on the basis of previous studies. Antibacterial resin composite contained nano-antibacterial inorganic fillers that were modified by quaternary ammonium salt with long-chain alkyl. Microcapsules were incorporated into antibacterial resin composite at mass fraction of 7.5%. A commercial resin composite named Tetric N-Ceram was used as control. The resin samples were immersed in 37 °C distilled water for different periods. A flexural test was used to measure the mechanical properties of the novel resin composite. A single-edge V-notched beam method was used to measure fracture toughness and self-healing efficiency. A dental plaque microcosm biofilm model with human saliva as inoculum was formed. Colony-forming units (CFU) and lactic acid production of biofilm on the novel resin composite were calculated to test the antibacterial property.
RESULTS:Mechanical properties and fracture toughness decreased significantly after the composite was immersed in water for 30 days (P<0.05), and no significant reduction was found from then on (P>0.05). Water immersion did not weaken the self-healing capability of the composite (P>0.05), and self-healing efficiency of 64% could still be obtained even after 270 days. The antibacterial resin composite showed a strong inhibition effect on the biofilm metabolic activity versus water immersion time from 1 day to 270 days. Therefore, the composite could still have a promising antibacterial property even after being immersed in water (P<0.05).
CONCLUSIONS:Water immersion could weaken the mechanical properties of the novel self-healing and antibacterial resin composite, but it insignificantly affected the self-healing and antibacterial properties of the composite.