تقييم متانة و درجة تحول مواد راتنجية تعويضية مؤقتة أساسها ثنائي ميتاكريلات مخبريا

الملخص EN

Background & Objective: New resin systems( di-methacrylates) were developed to improve the mechanical and physical properties of provivinal to investigate mechanical srength(edge- strength, diametrical tensile strength) and polymrrization(degree of conversion) of three newdi-methacrylates provisionals, and one of mono-methacrylate.

Material & Methods:A specimenof 40 discs- shaped for Edge-strength , and 40 double cylinder (4×6)mm10 of each for Diametral tensile strength , and 12(3×4) small quantities for Degree of conversion of three di-methacrylates: Protemp3 Garant (PT3), Tem Phase (TMP), and Luxatemp (LXT) and a mono-methacrylateTrim (TRM) were used; The discs aged one month at 37 c and 80% Relative Humidity were indentation by a Vickers diamond at a distance from the edge 0.5mm as its Edge-strength , until chipping.

Diametral tensile strength was measured at 5min and 1 hour after mixing.

The load was increased until broken diametrically using Howden Universal Testing Machine with a cross head of 0.5mm/min speed.

Degree of conversion at 24 hours after mixing was measured using FTIR spectroscopy, and baseline method.

The results were analyzed by Correlation Coefficient, ANOVA, Schaffè as p<0.05.

Results: The highest values (2073N) for edge- strength were displayed by PT3, 3 times than those of TMP and LXT.

Diametral tensile strength of PT3 (37.6MPa) at 1 hour was significantly higher than those of TMP and LXT (28.1MPa, 20.6MPa respectively) (p<0.05).

Degree of conversion of TMP (42.2%) was lower than those of PT3 and LXT.

Couclusion: Dimethacrylate TCB (PT3) have better edge strength, and diametral- strain strength than mono- methacrylates but astronger TCB (LXT) has higher degree of conversion