Own brand label restorative materials-A false bargain?
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.



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.



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.



The OBLs were in general outdone by the conventional composite.



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.
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.
Gaute Floer
GF
Johnsen
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.
Minh Khai Le
MK
Thieu
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.
Badra
B
Hussain
AGH University of Science and Technology in Kraków, Kraków, Małopolska, Poland. Electronic address: epamula@agh.edu.pl.
Elzbieta
E
Pamuła
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.
Janne Elin
JE
Reseland
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.
Ståle Petter
SP
Lyngstadaas
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.
Håvard
H
Haugen
D000072283:A549 Cells / Q000187:drug effects; D003188:Composite Resins / Q000737:chemistry* / Q000145:classification / Q000528:radiation effects / Q000633:toxicity*; D055117:Curing Lights, Dental; D003764:Dental Materials / Q000737:chemistry* / Q000145:classification / Q000528:radiation effects / Q000633:toxicity*; D003799:Dental Stress Analysis; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D010316:Particle Size; D058105:Polymerization; D013314:Stress, Mechanical; D013499:Surface Properties
D003188:Composite Resins; D003764:Dental Materials; C444701:Filtek Z250
Composites; Cytotoxicity; Degree of conversion; Flexural strength; Own brand label; Residual monomers