Abstract
GC FujiCEM 2 and GC G-CEM LinkAce:New product developments subject to scientific testing
Dr Ulrich Lohbauer, Erlangen University Hospital, Dental Clinic 1 – Dental Conservation and Periodontology, Dental Biomaterials lab
GC Europe is presenting a number of new solutions for dentists at the IDS 2013. The Dental Biomaterials lab at Erlangen University Hospital has been closely involved in the product development process for luting materials.The two new or further developments shown here are the resin-modified glass ionomer luting cement FujiCEM 2 and the newly developed self-adhesive luting cement GCEM LinkAce.
FujiCEM 2
As part of the development process for FujiCEM 2 the Dental Biomaterials lab at Erlangen University Hospital investigated the mechanical properties of FujiCEM 2in comparison with FujiCEM (Automix) and studied the adhesive properties (shear bond strength) on enamel and dentine.With FujiCEM 2 flexural strength was unchanged(26.5 MPa) and significantly increased flexibility was measured (elasticity module 3.0 GPa) in comparison with FujiCEM Automix (elasticity module 4.3 GPa). This is reflected in significantly improved fracture resistance (tensile energy absorption 2.6 Nmm) for FujiCEM 2. Furthermore, an equivalent shear bonding of 6.2 MPa was measured for FujiCEM 2on bovine enamel (FujiCEM Automix 6.1 MPa). On bovine dentine shear bonding increased from 3.2 MPa (FujiCEM Automix) to 4.4 MPa for FujiCEM 2. The mechanical values and shear bonding rates measured here confirm the data reported in The Dental Advisor, even though in this study the additional step of substrate conditioning (Fuji Plus Conditioner) was deliberately omitted.
G-CEM LinkAce
The Dental Biomaterials lab at Erlangen University Hospital was involved during the development of G-CEM LinkAce in evaluating its adhesive properties. To obtain an objective image of the material, the measurements were conducted in self-curing mode(SC) compared with competitors’ products. For this purpose, the micro-tensile bond strength (µTBS) was measured on human dentine and the tensile strength on silicate (lithium disilicate) and oxide ceramic (zirconia) restoration materials.Micro-tensile strength of 20.5 MPa was measured for G-CEM LinkAce (SC) on humandentine. This meant a stable, adhesive bond with hard tooth tissue could be guaranteed, which was partly superior to that of competing products. G-CEM LinkAce showed superior values in adhesion to zirconiacompared with competitors’ products with tensile strength of 21 MPa (SC) and 27 MPa (LC). The high strength values were also confirmed after 5,000 cycles ofthermocycling (17 MPa (SC); 30 MPa (LC)). The results for bonding to silicate materials were similarly stable.