Gaute Floer Johnsen1, Minh Khai Le Thieu2, Badra Hussain3, Elzbieta Pamuła4, Janne Elin Reseland5, Ståle Petter Lyngstadaas6, Håvard Haugen7. 1. University of Oslo, Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, Geitmyrsveien 71, Oslo, NO 0455, Norway. Electronic address: gautefj@odont.uio.no. 2. University of Oslo, Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, Geitmyrsveien 71, Oslo, NO 0455, Norway. Electronic address: mkthieu@student.odont.uio.no. 3. University of Oslo, Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, Geitmyrsveien 71, Oslo, NO 0455, Norway. Electronic address: badrah@student.odont.uio.no. 4. AGH University of Science and Technology in Kraków, Kraków, Małopolska, Poland. Electronic address: epamula@agh.edu.pl. 5. University of Oslo, Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, Geitmyrsveien 71, Oslo, NO 0455, Norway. Electronic address: j.e.reseland@odont.uio.no. 6. University of Oslo, Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, Geitmyrsveien 71, Oslo, NO 0455, Norway. Electronic address: s.p.lyngstadaas@odont.uio.no. 7. University of Oslo, Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, Geitmyrsveien 71, Oslo, NO 0455, Norway. Electronic address: h.j.haugen@odont.uio.no.
Abstract
OBJECTIVES: This study aims at evaluating and comparing mechanical, chemical, and cytotoxicological parameters of a commercial brand name composite material against two 'own brand label' (OBL) composites. METHODS: Parameters included depth of cure, flexural strength, degree of conversion, polymerization shrinkage, filler particle morphology and elemental analyzes, Vickers hardness, surface roughness parameters after abrasion, monomer elution, and cytotoxicity. RESULTS: The conventional composite outperformed the OBLS in terms of depth of cure (p<0.001), degree of cure at the first and last time intervals (p<0.001), hardness (p<0.001), and post-abrasion roughness (p<0.05). The polymerization volumetric shrinkage ranged from 2.86% to 4.13%, with the highest shrinkage seen among the OBLs. Both Monomer elution from the OBLs was statistically significantly higher (p<0.001). Statistically significantly higher cytotoxicity combined with altered morphology and loss of confluence was detected in the cells exposed to extracts from the OBLs. CONCLUSIONS: The OBLs were in general outdone by the conventional composite. CLINICAL SIGNIFICANCE: OBLs restorative materials have become pervasive in the dental market. Manufacturers often promise equal or better characteristics than existing brand-name composites, but at a lower price. Dentists are highly recommended to reconsider utilization of OBLs lacking sound scientific scrutiny, and our findings underscore this recommendation.
OBJECTIVES: This study aims at evaluating and comparing mechanical, chemical, and cytotoxicological parameters of a commercial brand name composite material against two 'own brand label' (OBL) composites. METHODS: Parameters included depth of cure, flexural strength, degree of conversion, polymerization shrinkage, filler particle morphology and elemental analyzes, Vickers hardness, surface roughness parameters after abrasion, monomer elution, and cytotoxicity. RESULTS: The conventional composite outperformed the OBLS in terms of depth of cure (p<0.001), degree of cure at the first and last time intervals (p<0.001), hardness (p<0.001), and post-abrasion roughness (p<0.05). The polymerization volumetric shrinkage ranged from 2.86% to 4.13%, with the highest shrinkage seen among the OBLs. Both Monomer elution from the OBLs was statistically significantly higher (p<0.001). Statistically significantly higher cytotoxicity combined with altered morphology and loss of confluence was detected in the cells exposed to extracts from the OBLs. CONCLUSIONS: The OBLs were in general outdone by the conventional composite. CLINICAL SIGNIFICANCE: OBLs restorative materials have become pervasive in the dental market. Manufacturers often promise equal or better characteristics than existing brand-name composites, but at a lower price. Dentists are highly recommended to reconsider utilization of OBLs lacking sound scientific scrutiny, and our findings underscore this recommendation.