Yrd. Doç. Dr. Tolga AKOVA, Yrd. Doç. Dr. M T.burak ÖZÇELİK, Yrd. Doç. Dr. Neslin AYTUTULDU, Yrd. Doç. Dr. Ahmet ÖZKÖMÜR
FARKLI AKRİL TEPİM YÖNTEMLERİNİN AKRİLİK MALZEMENİN MEKANİK ÖZELLİKLERİNE ETKİSİNİN İNCELENMESİ
Amaç: Çal$ mam$z$n amac$, iki farkl$ akril muflalama tekni3inin akrilik rezinlerin bükülme dayan$m$ve sertlikleri üzerindeki etkisi incelenmektir. Gereç ve Yöntem: Çal$ mada iki farkl$ grup ve materyal olarak da her grup içinde iki farkl$ materyal test edildi: konvan- siyonel yöntemle muflalanan Meliodent ve Entacryl, enjeksiyon yöntemiyle muflalalan Ivocap Plus ve Meli-dent. Her bir alt grup için 8 adet örnek (65mm uzunluk, 10 mm geni lik, 2.5mm yükseklik) haz$rland$. Örneklerin bükülme dayan$mlar$ üniversal test cihaz$nda üç nokta bükülme testi uygulanarak bulundu (5 mm/ dakika ba l$k h$z$). K$r$lan örnekler daha sonra sertlik testleri için kullan$ld$. Dijital mikro sertlik test cihaz$ kullan$larak, her bir örnek için Knoop sertlik de3eri tespit edildi. Bulgular: Entacryl istatistiksel olarak (p0.05). Enjeksiyon yöntemi kullan$larak muflalan$lan Meliodent’in istatistiksel olarak en dü ük bükülme dayan$m$na sahip oldu3u tespit edildi (p0.05). Ivocap Plus’$n istatistiksel olarak en dü ük sertlik de3erine sahip oldu3u tespit edildi (p
Anahtar Kelimeler:
bükülme dayan$m$, sertlik, enjeksiyon muflalama
THE EVALUATION OF THE EFFECTS OF DIFFERENT ACRYLIC MOLDING TECHNIQUES ON THE MECHANICAL PROPERTIES OF ACRYLIC RESINS
Purpose: The purpose of this study was to investigate the effects of two different acrylic molding techniques on flexural strength and hardness of acrylic resins. Material and Method: In this study, two different test groups were used; with conventional molding method Meliodent and Entacryl, with injection molding method Ivocap Plus and Meliodent. For each group, 8 specimens for each material ( 65 mm length, 10 mm width, 2,5 mm height) were prepared. The flexural strength (FS) values of the specimens were assessed by 3 point bending test using a universal testing machine (5mm/min crosshead speed) and then the fractured specimens were used for the determination of the Knoop hardness number (KHN) using a digital micro-hardness tester.Results: As for the flexural strength values, as Entcryl has (p<0.05) the highest strength value, Meliodent with conventional molding method is the second and Ivocap Plus Plus material is the third turn. But there is no statistically signifigant differences between two materials (Meliodent and Ivocap) (p>0.05). Meliodent with injection molding has the lowest flexural strength values (p<0.05). The Meliodent with conventional molding method is the hardness material, the Meliodent and Entacryl with injection molding follows it in turn. Ivocap Plus has the lowest hardness value (p<0.05). Conclusion: When injection molding technique used with the specially prepared material, flexural strength and hardness values are acceptable. There is no advantage when the traditional acrylic material molded with ivocap plus.
Keywords:
flexural strength, hardness, injection molding,
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- Jorge JH, Giampaolo ET, Machado AL, Vergani CE. Cytotoxicity of denture base acrylic resins: A literature review. J Prosthet Dent 2003; 90: 1903.
- Faot F, Costa MA, Cury AA, Garcia RCM. Impact strength and fracture morphology of denture acrylic resins. J Prosthet Dent 2006; 96: 367-73.
- Vallittu PK, Lassila VP, Lappalainen R. Evaluation of damage to removable dentures in two cities in Finland. Acta Odontol Scand 1993; 51(6): 363-9.
- Hargreaves AS. The prevalence of fractured dentures. A survey. Br Dent J 1969; 126(10): 451-5.
- Darbar UR, Huggett R, Harrison A. Denture fracture – a survey. Br Dent J 1994; 176(9): 3425.
- Memon MS, Yunus N, Razak AA. Some mechanical properties of a Highly Cross-Linked, Microwave- polymerized, Injection- Molded Denture Base Polymer. Int J Prosthodont 2001; 14: 214-8.
- Leo´n BLT, Cury AADB, Garcia RCMR Water sorption, solubility, and tensile bond strength of resilient denture lining materials polymerized by different methods after thermal cycling. J Prosthet Dent 2005; 93: 282-7.
- McKinstry RE. Microwave processing of permanent soft denture liners. Compendium 1991; 12: 32-7.
- Keenan PLJ, Radford DR, Clark RKF. Dimenstional change in complete dentures fabricated by injection molding and microwave processing. J Prosthet Dent 2003; 89: 37-44.
- Karacaer Ö, Polat TN, Tezvergil A, Lasilla LVJ, Vallittu PK. The effect of length and concentration of glass fibers on the mechanical properties of an injection- and a compressionmolded denture base polymer. J Prosthet Dent 2003; 90: 385-93.
- Anusavice KJ. Phillips’ Science of Dental Materials Middle East and African Edition. 11 th ed. Elsevier Saunders, 2003. Chapter 4.
- Yoldas O, Akova T, Uysal H. Influence of different indentation load and dwell time on Knoop microhardness tests for composite materials. Polymer Testing 2004; 23: 343-346
- LonXar A, VojvodiY D, MatejiXek F, Jerolimov V. Flexural strength of denture base materials. Acta Stomatol Croat 2006; 40:151-61.
- http://www.orplab.com/Ivocap Plus.html
- Zappini G, Kammann A, Wachter W. Comparison of fracture tests of denture base materials. J Prosthet Dent 2003; 90: 578-85.
- Uzun G, Hersek N. Comparison of fracture resistance of six denture base acrylic resins. J Biomater Appl 2002; 17: 19-29.
- Başlangıç: 1986
- Yayıncı: Atatürk Üniversitesi
Sayıdaki Diğer Makaleler
Yrd. Doç. Dr. M. Şamil AKYIL, Prof. Dr. Zeynep Yeşil DUYMUŞ, Yrd. Doç. Dr. Tolga AKOVA, Arş. Gör. Dt. Duygu KÜRKLÜ, Yrd. Doç. Dr. Elanur KARABULUTLU
FARKLI AKRİL TEPİM YÖNTEMLERİNİN AKRİLİK MALZEMENİN MEKANİK ÖZELLİKLERİNE ETKİSİNİN İNCELENMESİ
Yrd. Doç. Dr. Tolga AKOVA, Yrd. Doç. Dr. M T.burak ÖZÇELİK, Yrd. Doç. Dr. Neslin AYTUTULDU, Yrd. Doç. Dr. Ahmet ÖZKÖMÜR