IADR Abstract Archives
Selected Mechanical Properties of Temporary Crown and Bridge
Objective: This study examined an experimental provisional material and compares selected mechanical properties of this material with five other conventionally used provisional materials.
Methods: Six groups (N=6) were selected to undergo a three-point flexural test comparable to ISO4049 to determine flexural strength, fracture work and deflection using a Zwick materials testing machine. Compressive strength was measured according to standard DIN53454. Impact strength was measured according to Charpy(ISO 179-1). The materials used were Voco Structur-Premium(SP), 3M ESPE Experimental Protemp(ExpP), Zhermack Acrytemp(AT), Kaniedenta Kanitemp-Royal(KT), Dentsply Integrity-Fluorescence(INT) and DMG Luxatemp-Fluorescence(LT).
Results: Data was analyzed using a one way ANOVA with a Fisher test and a confidence interval of 95%. Summary of results and mean values including standard deviations (in brackets) were calculated.
Mechanical Property | Summary of Results | |||||||
Flexural strength(Mpa) | ExpP significantly better than AT,INT,KT,LT | |||||||
Deflection(mm) | ExpP significantly better than AT,INT,KT,LT,SP | |||||||
Fracture work(KJ/m²) | ExpP significantly better than AT,INT,KT,LT,SP | |||||||
Impact strength(KJ/m²) | ExpP significantly better than AT,INT,KT,LT,SP | |||||||
Compressive strength(Mpa) | ExpP significantly better than AT,INT,KT,LT,SP | |||||||
Material | Flexural strength [Mpa] | Deflection [mm] | Fracture work [kJ/m²] | Impact strength [kJ/m²] | Compressive strength [Mpa] | |||
SP | 113,0 [4,4] | 1,04 [0,06] | 8,64 [0,94] | 8,5 [1,2] | 340,8 [17,0] | |||
ExpP | 91,4 [3,4] | 1,43 [0,12] | 10,74 [1,58] | 15,7 [4,5] | 395,6 [29,0] | |||
AT | 70,0 [6,0] | 1,25 [0,10] | 6,77 [1,03] | 7,0 [1,6] | 257,5 [20,2] | |||
KT | 72,5 [4,2] | 1,18 [0,06] | 6,54 [0,62] | 7,6 [1,4] | 250,1 [17,7] | |||
INT | 72,5 [3,6] | 0,97 [0,10] | 5,13 [0,83] | 8,8 [2,6] | 283,0 [19,2] | |||
LT | 74,4 [3,6] | 1,06 [0,10] | 5,94 [1,04] | 7,3 [1,3] | 281,5 [9,6] | |||
Conclusion: According to the results of this study, the ExpP material shows significantly better values for deflection, fracture work, compressive strength and impact strength when compared to each of the other materials. Partially sponsored by 3M ESPE