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Zhou J, Xu Q, Fan C, Ren H, Xu S, Hu F, Wang L, Yang K, Ji Q. Characteristics of chitosan-modified glass ionomer cement and their effects on the adhesion and proliferation of human gingival fibroblasts: an in vitro study. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2019; 30:39. [PMID: 30840153 DOI: 10.1007/s10856-019-6240-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 02/18/2019] [Indexed: 06/09/2023]
Abstract
This study explores the possibility of adhering gingival tissue to a root surface that was restored with chitosan (CS)-modified glass ionomer cement (GIC) in the case of gingival recessions associated with root caries, which provides a theoretical basis for clinical application at the cellular level. The specimens were mixed after integrating 1, 2, and 4 wt% CS into the GIC fluid. The characteristics and cytocompatibility were then examined. As more CS was incorporated into the GIC fluid, the mechanical properties and cytocompatibility of chitosan-modified glass ionomer cement (CS-GIC) first improved but then reduced. Under scanning electron microscopy, microcracks were observed on the surface of all materials, but the fewest microcracks were observed on the surface of 2 wt% CS-GIC. The compressive strength of 2 wt% CS-GIC was significantly higher than that of the other groups at 5 days (P < 0.05) and the addition of chitosan didn't change the basic fracture mode of materials. Additionally, the integration 2 wt% CS into GIC can obviously reduce acidity of the original GIC (P < 0.01) when using extracts with concentrations of 100 and 50%. The Cell Counting Kit-8 assay and adhesion and proliferation of human gingival fibroblasts (HGFs) on the surface of the materials indicated that 2 wt% CS-GIC presented better cytocompatibility and was more suitable for the growth of HGFs. In summary, 2 wt% CS-GIC could be considered as a potential root filling material to allow the adhesion and growth of gingival tissue.
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Affiliation(s)
- Jia Zhou
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Quanchen Xu
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Chun Fan
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Hao Ren
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Shuo Xu
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Fang Hu
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Lei Wang
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Kai Yang
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China
| | - Qiuxia Ji
- Department of Periodontology, The Affiliated Hospital of Qingdao University, 16# Jiangsu Road, Qingdao, Shandong, China.
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Ruse N. Letter to the Editor, “Dentin Bonding Testing Using a Mini-interfacial Fracture Toughness Approach”. J Dent Res 2016; 95:953. [DOI: 10.1177/0022034516651054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- N.D. Ruse
- University of British Columbia–Biomaterials, Faculty of Dentistry, Vancouver, Canada
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Abstract
Dental crowns are used to replace damaged natural crowns of teeth and are fixed to prepared teeth with luting cements, which should provide an adhesive bond to the tooth structure giving reliable retention and minimal microleakage. Mechanical testing of crowns in vitro gives failure load distributions that are well described by Weibull models, comparing probabilities of survival and reliability. Fatigue testing of crowns is time consuming, but regression analysis to interpolate functions through data points quoting probability limits or applying Weibull analysis is achievable. A complementary approach is to conduct materials tests with appropriate interfacial geometries. Luting cements are used in thin layers of 40–150 um. Contraction during polymerization is restrained by adhesion to substrates, allowing little relaxation of stresses. Conventional and resin-modified glass ionomer cements create thin zones of interaction with dentine and fail cohesively. The chevron notch short rod technique has been used to measure fracture toughness and rank cements. A development of this method, using chevron notch short bar specimens, permitted fracture toughness to be determined for luting cement-dentine substrate interfaces. Representative fracture experiments need to be developed to apply mixed mode conditions. The basic challenge to predict long-term performance from short-term laboratory tests remains.
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Affiliation(s)
- C A Mitchell
- Division of Restorative Dentistry, School of Dentistry, Queen's University Belfast, Grosvenor Road, Belfast BT12 6BA, UK.
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Ryan AK, Mitchell CA, Orr JF. Fracture mechanics analysis of the dentine-luting cement interface. Proc Inst Mech Eng H 2002; 216:271-6. [PMID: 12206524 DOI: 10.1243/09544110260138763] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The objectives of this study were to determine the fracture toughness of adhesive interfaces between dentine and clinically relevant, thin layers of dental luting cements. Cements tested included a conventional glass-ionomer, F (Fuji 1), a resin-modified glass-ionomer, FP (Fuji Plus) and a compomer cement, D (DyractCem). Ten miniature short-bar chevron notch specimens were manufactured for each cement, each comprising a 40 microm thick chevron of lute, between two 1.5 mm thick blocks of bovine dentine, encased in resin composite. The interfacial K(IC) results (MN/m3/2) were median (range): F; 0.152 (0.14-0.16), FP; 0.306 (0.27-0.37), D; 0.351 (0.31-0.37). Non-parametric statistical analysis showed that the fracture toughness of F was significantly lower (p <0.05) than those of FP or D, and all were significantly lower than values for monolithic cement specimens. Scanning electron microscopy of the specimens suggested crack propagation along the interface. However, energy dispersive X-ray analysis indicated that failure was cohesive within the cement. It is concluded that the fracture toughness of luting cement was lowered by cement-dentine interactions.
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Affiliation(s)
- A K Ryan
- School of Mechanical and Manufacturing Engineering, The Queen's University of Belfast, UK
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