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Conference Paper: Shear-bond-strength And Remineralisation-effect Of CPPACP-modified Glass-ionomer To Artificial Caries-affected Dentine
Title | Shear-bond-strength And Remineralisation-effect Of CPPACP-modified Glass-ionomer To Artificial Caries-affected Dentine |
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Authors | |
Issue Date | 2017 |
Publisher | International Association for Dental Research. |
Citation | The 31st IADR-SEA & 28th SEAADE Annual Scientific Meeting & 40th CTADS Annual Scientific Meeting, Taipei, Taiwan, 10-13 August 2017, p. S0034 How to Cite? |
Abstract | Objectives: To investigate the effect of casein phosphopeptide-amorphous calcium phosphate (CPPACP) modified glass-ionomer cement (GIC) on shear bond strength (SBS) and remineralisation to artificial caries-affected dentine.
Methods: Human dentine slices were demineralised to mimic caries-affected dentine. They were then randomly allocated to three restoration groups (n=16 per group): group-1, conventional GIC; group-2, CPPACP modified GIC; and group-3, resin modified GIC. The SBS of the samples was measured using a universal testing machine (n=8 per group). The failure modes of the fractured samples were analyzed by scanning electronic microscopy (SEM). The remaining samples (n=8 per group) were subjected to pH cycling for 28 days. After pH cycling, lesion depth and micro-mechanical properties of the samples were investigated by micro-computed tomography (micro-CT) and nano-indentation, respectively.
Results: The SBS for group-1, group-2 and group-3 were 4.5±1.6 MPa, 4.3±1.2 MPa and 6.6±1.7 MPa, respectively (p=0.01; group-1, group-2 < group-3). The results of failure modes of the 3 groups were summarized in Table 1. Representative modes of failure under SEM were shown in Figure 1. Micro-CT determined lesion depths for group-1, group-2 and group-3 were 186±8 µm, 149±14 µm and 178±8 µm, respectively (p<0.001; group-2< group-1, group-3). The mean nano-hardness values for group-1, group-2 and group-3 were 0.17±0.04 GPa, 0.25±0.06 GPa and 0.14±0.05 GPa, respectively (p<0.001; group-1, group-3< group-2). The mean elastic moduli for group-1, group-2 and group-3 were 6.02±0.59 GPa, 7.27±0.86 GPa and 5.70±1.14 GPa, respectively (p=0.005; group-1, group-3< group-2). The load-displacement curve of the 3 restoration groups was shown in Figure 2.
Conclusions: The results indicate that the incorporation of CPPACP into GIC would not adversely affect the adhesion to artificial caries-affected dentine. Furthermore, it is superior to conventional GIC in promoting remineralisation on artificial caries-affected dentine and hence can be a better restorative material than conventional GIC for restoration. |
Persistent Identifier | http://hdl.handle.net/10722/247707 |
DC Field | Value | Language |
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dc.contributor.author | Zhao, IS | - |
dc.contributor.author | Mei, L | - |
dc.contributor.author | Burrow, MF | - |
dc.contributor.author | Lo, ECM | - |
dc.contributor.author | Chu, CH | - |
dc.date.accessioned | 2017-10-18T08:31:21Z | - |
dc.date.available | 2017-10-18T08:31:21Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | The 31st IADR-SEA & 28th SEAADE Annual Scientific Meeting & 40th CTADS Annual Scientific Meeting, Taipei, Taiwan, 10-13 August 2017, p. S0034 | - |
dc.identifier.uri | http://hdl.handle.net/10722/247707 | - |
dc.description.abstract | Objectives: To investigate the effect of casein phosphopeptide-amorphous calcium phosphate (CPPACP) modified glass-ionomer cement (GIC) on shear bond strength (SBS) and remineralisation to artificial caries-affected dentine. Methods: Human dentine slices were demineralised to mimic caries-affected dentine. They were then randomly allocated to three restoration groups (n=16 per group): group-1, conventional GIC; group-2, CPPACP modified GIC; and group-3, resin modified GIC. The SBS of the samples was measured using a universal testing machine (n=8 per group). The failure modes of the fractured samples were analyzed by scanning electronic microscopy (SEM). The remaining samples (n=8 per group) were subjected to pH cycling for 28 days. After pH cycling, lesion depth and micro-mechanical properties of the samples were investigated by micro-computed tomography (micro-CT) and nano-indentation, respectively. Results: The SBS for group-1, group-2 and group-3 were 4.5±1.6 MPa, 4.3±1.2 MPa and 6.6±1.7 MPa, respectively (p=0.01; group-1, group-2 < group-3). The results of failure modes of the 3 groups were summarized in Table 1. Representative modes of failure under SEM were shown in Figure 1. Micro-CT determined lesion depths for group-1, group-2 and group-3 were 186±8 µm, 149±14 µm and 178±8 µm, respectively (p<0.001; group-2< group-1, group-3). The mean nano-hardness values for group-1, group-2 and group-3 were 0.17±0.04 GPa, 0.25±0.06 GPa and 0.14±0.05 GPa, respectively (p<0.001; group-1, group-3< group-2). The mean elastic moduli for group-1, group-2 and group-3 were 6.02±0.59 GPa, 7.27±0.86 GPa and 5.70±1.14 GPa, respectively (p=0.005; group-1, group-3< group-2). The load-displacement curve of the 3 restoration groups was shown in Figure 2. Conclusions: The results indicate that the incorporation of CPPACP into GIC would not adversely affect the adhesion to artificial caries-affected dentine. Furthermore, it is superior to conventional GIC in promoting remineralisation on artificial caries-affected dentine and hence can be a better restorative material than conventional GIC for restoration. | - |
dc.language | eng | - |
dc.publisher | International Association for Dental Research. | - |
dc.relation.ispartof | International Association for Dental Research South East Asian Division Meeting (IADR-SEA) | - |
dc.title | Shear-bond-strength And Remineralisation-effect Of CPPACP-modified Glass-ionomer To Artificial Caries-affected Dentine | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Mei, L: mei1123@hku.hk | - |
dc.identifier.email | Burrow, MF: mfburr58@hku.hk | - |
dc.identifier.email | Lo, ECM: edward-lo@hku.hk | - |
dc.identifier.email | Chu, CH: chchu@hku.hk | - |
dc.identifier.authority | Mei, L=rp01840 | - |
dc.identifier.authority | Burrow, MF=rp01306 | - |
dc.identifier.authority | Lo, ECM=rp00015 | - |
dc.identifier.authority | Chu, CH=rp00022 | - |
dc.identifier.hkuros | 280889 | - |
dc.identifier.spage | S0034 | - |
dc.identifier.epage | S0034 | - |
dc.publisher.place | Taipei, Taiwan | - |