RT Journal Article
T1 A predictive formula of the contraction stress in restorative and luting materials attending to free and adhered surfaces, volume and deformation
A1 Miguel Calvo, Alicia
A1 Macorra García, José Carlos De La
AB Objectives: To find a predictive formula of stress, considering the surfaces (free, adhered) involved, the volume and characteristics of material and the deformation of the measuring system.Materials and methods: 231 samples of five chemically cured restoratives (Silar (SIL, 23), Clearfil F2 (CLE, 39), P10 (P10, 33), Concise (CON, 30), Isopast (ISO, 28)) and four luting (3M Experimental 241 (EXM, 20), Variolink II (VAR, 13), Vitremer LC (VTM, 20) and Dyract Cem (DYR, 25)) materials were allowed to polymerize until they reached a maximum tension (Tmax, 25 min) between six pairs (B 5.81, 8.5, 11.26, 12.42, 17.02, 23.14 mm) of polished metallic discs (range of distances: 0.02±5.9 mm) mounted in a tension machine. The deformation of the measuring system was measured for the recorded forces.Results: A descriptive non-linear formula was found that individualizes the material's characteristics (K) that considers volume (Vol), free (FS) and adhered (AS) surfaces and deformation (Def) of the system for each force. This formula renders good correlation (material K (r2 coeffcient)): SIL 0.9998 (0.995), CLE 1.0062 (0.989), P10 1.0224 (0.990), CON 0.9908 (0.992), ISO 0.9648 (0.974), EXM 1.0083 (0.991), VAR 0.9777 (0.996), VTM 0.9925 (0.993), DYR 0.9971 (0.997) between actual Tmax and calculated Tension. There are statistically signifcant differences  between K values of both (restorative and luting) groups. Signifcance: Predictive parameters have influence in a different way to what is actually considered, if the system is allowed to have deformation, as occurs naturally and volume and material's characteristics are considered.
YR 2001
FD 2001
LK https://hdl.handle.net/20.500.14352/60346
UL https://hdl.handle.net/20.500.14352/60346
LA eng
DS Docta Complutense
RD 28 abr 2025