Evaluation of the Compressive and Diametric Tensile Strength of Two Type Nano and Two Type Hybrid Composites

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281 4 / 34 / 1389 / *** ** ** #* * ** *** 89/5/18 : 89/1/21 : Evaluation of the Compressive and Diametric Tensile Strength of Two Type Nano and Two Type Hybrid Composites Abdorahim Davari*#, AliReza DaneshKazemi**, SayedMajid Mousavinasab**, SayedAbdolhojeh Alavi*** * Associate Professor, Dept of Operative Dentistry, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. ** Assistant Professor, Dept of Operative Dentistry, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. *** Dentist Received: 10 April 2010; Accepted: 9 August 2010 Introduction: Restorative materials should be able not to strain under pressure during restoration process or mastication, so their mechanical properties are of high importance. The aim of this study was to evaluate the compressive and diametric tensile strength of hybrid and nanofilled composite restorative materials. Materials & Methods: Two hybrids (Diafil & Spectrum) and two nanofilled composite (nex com & synergy nano) were used in this in vitro experimental study. Samples were placed in a special circular mold and were light cured. After removing, the samples were stored in a light proof container under distilled water for 1 week. The specimens were then submitted to compressive and diametric tensile test, using universal compression machine at a crosshead speed of 1 mm/min. Data were analyzed using ANOVA and Duncan tests at significant level of 0.05. Results: There was not any significant difference between the values of compressive strengths of the composites (P>0.05). Nex comp showed the least diametric tensile strength (P<0.05), but no significant difference was detected between the other three materials. Conclusion: Compressive strength of various composites was about the same, but diametric tensile strength of Nexcomp nanofilled composites was lower than other nanofilled or hybrid composites. Key words: Hybrid composite, nano composite, diametric tensile strength (), compressive strength (CS). # Corresponding Author: rdavari2000@yahoo.com J Mash Dent Sch 2011; 34(4): 281-90. :.. (Diafil, Swectrum) - :. (Nex comp, Synergy nano) ANOVA. 1 mm/min. 0/05 ------------------------------------------------------ 09131523567 0351-6256975 : 89195/165 : # E-mail: rdavari2000@yahoo.com

( )... 282 :.(P<0/05) Nex comp.(p>0/05). ) Nex comp :. (. :.281-90 : 4 / 34 1389 /... 79/5 (4).. (5). ( 1 )... (1). (2).. (Hybrid, Packable) (3). 75 25 ( )

283 4 / 34 / 1389 / () 2. (DMC Ultrablue). 2005 Aguiar (9). (Z250, 3MESPE). 2008 Filtek Z250) (EX-Esthet-X EX (σf) Bona (10). 4 (σt) VE-Vitol-escence AM-Amelogen.. σf σt (11). Z250 2009 Ilie N Packable 72 σf σt Flowable. 4 3 (FM) (FS) 5 (CS) 2. : Diametral Tensile Strength 3. FS: Flexibility strength 4. FM: Flexibility modulus 5. CS: Compressive strength () (APS) 1. APS (6).. (7). 100 0/1 (8). 2005 Tolosa. (3MESpe ) P60 (3MESpe) A110 (Heraeus-Kulzer) HAL LED 1. APS: Average particle size (Degussa Degulux)

( )... 284 ().. 40 2. Dent America) 550 mw/cm 2 mm (. 40. 1 37 o C. (SANTAM Co. STM-400 serial No:818408). 1 mm/min. CS=F/πr 2 (CS).(1 ).. Flowable. %60 FM FS CS (12). CS. Diafill). Nex comp) A 2 (Spectrum (Synergy Nano.(1 ) - 3 mm 6 mm.

285 4 / 34 / 1389 / Composite Diafill Organic/inorganic Matrix Bis-GMA TEGDEMA : 1 Inorganic Filler Filler size % Filler Boro-Silicate, Aluminum silica particles 1 µm %80* Specterum Bis-GMA Bis-EMA TEGDEMA Boro-Silicate, Aluminum silicon dioxide 1 /5µm %77* Nex Comp Nano Bis-GMA Barium glass and silicon Particles 0 /4µm %75* Synergy Nano * Manufacturer s information Bis-GMA TEGDEMA silicon Particles Barium glass Strontium Particles 0 /6µm %74* ). (5 ADA. 2 1/5. 40 ). 40.( 1 37 o C. MPa : 1. 6 mm 3 mm -

( )... 286. 3 3.(P=0/038) 4 Synergy Nano Hybrid Diafil.(P<0/05) Nex comp. () L. t =2p/πDt D.(2 ) : 2 (MPA ) 58/95 236/28 Hybrid Diafil 43/88 249/86 Hybrid Spectrum 51/86 266/77 Nex comp nano 33/47 238/88 Synergy nano P-value=0/570 : 3 (MPa ) 7/13 29/56 Hybrid Diafil 3/51 32/74 Hybrid Spectrum 4/75 26/23 Nex Comp Nano 4/82 31/91 Synergy Nano P-value=0/038 : 2 SANTAM Co. STM-400 Serial No: 818408. 1mm/min. ANOVA. 0/05. 2 2 ANOVA.(P=0/570)

287 4 / 34 / 1389 / Diafill (17). Nexcomp.(1 ) (18). Li. (1119-21). 30-50 (MPA) (20). (25-33).. For α=0/05 2 29/56 31/91 32/74 0/207 Subset 1 26/23 29/56 0/162 10 10 10 10 : 4 Nex Comp Nano Hybrid Spectrum Synergy Nano Hybrid Diafil.. (13).... (14-16).

( )... 288 (25). ( ) (26)... : -1. -2. -3.. TEGDMA Bis-GMA. Bis-EMA.(3 ).. Chung (22). Dauvillier (23). (2224)..(1 )

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