Aim: to evaluate the mechanical properties of three different sizes of Fiber Reinforced Composites (FRCs) (diameter: 0.6, 1.2, 1.6 mm) (Stick Tech Ltd, Turku, Finlandia) and to compare them with those of 4 different sections of orthodontic wires commonly used in orthodontic therapy (section: 0.016", 0.018", 0.017"x 0.025", 0.019"x 0.026"). Materials and methods: Three different variables of FRCs were examined: diameter, type of light-curing, and storage modality. Each FRC and orthodontic wire sample was tested with a three-point bending test by means of a universal testing machine (Lloyd LRX, Lloyd Instruments Ltd., Fareham, England). For each FRC group and orthodontic wire section 6 specimens were tested up to 1- and 2 mm deflections. Data were statistically analyzed (three-way ANOVA and Tukey´s Multiple Comparison Test). Results: The ANOVA indicated statistically significant differences for the three factors investigated. The 1.2 mm FRCs showed maximum deflection values that were significantly higher than those achieved in all the remaining groups, particularly when stored in dry environment. When FRCs were stored in distilled water and cured with Optilux (40 seconds), produced maximum deflection values not significantly different from those achieved with 0.019"x 0.026" SS orthodontic wires. The 0.016" SS wire did not show statistically significant differences compared to 0.018" SS wire and 0.6 mm FRCs stored in distilled water.Conclusions: The present investigation demonstrates that in patients who present esthetic concerns or allergies to conventional orthodontic wires and brackets, FRCs might represent an advantageous alternative for the future.
FIBER REINFORCED COMPOSITES (FRCS) AND ORTHODONTIC STAINLESS STEEL WIRES: COMPARISON OF MECHANICAL PROPERTIES BY MEANS OF THREE-POINT BENDING TEST
LUCCHESE, Alessandra;
2003
Abstract
Aim: to evaluate the mechanical properties of three different sizes of Fiber Reinforced Composites (FRCs) (diameter: 0.6, 1.2, 1.6 mm) (Stick Tech Ltd, Turku, Finlandia) and to compare them with those of 4 different sections of orthodontic wires commonly used in orthodontic therapy (section: 0.016", 0.018", 0.017"x 0.025", 0.019"x 0.026"). Materials and methods: Three different variables of FRCs were examined: diameter, type of light-curing, and storage modality. Each FRC and orthodontic wire sample was tested with a three-point bending test by means of a universal testing machine (Lloyd LRX, Lloyd Instruments Ltd., Fareham, England). For each FRC group and orthodontic wire section 6 specimens were tested up to 1- and 2 mm deflections. Data were statistically analyzed (three-way ANOVA and Tukey´s Multiple Comparison Test). Results: The ANOVA indicated statistically significant differences for the three factors investigated. The 1.2 mm FRCs showed maximum deflection values that were significantly higher than those achieved in all the remaining groups, particularly when stored in dry environment. When FRCs were stored in distilled water and cured with Optilux (40 seconds), produced maximum deflection values not significantly different from those achieved with 0.019"x 0.026" SS orthodontic wires. The 0.016" SS wire did not show statistically significant differences compared to 0.018" SS wire and 0.6 mm FRCs stored in distilled water.Conclusions: The present investigation demonstrates that in patients who present esthetic concerns or allergies to conventional orthodontic wires and brackets, FRCs might represent an advantageous alternative for the future.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
