Özlem Duran

Effect of glass fibre reinforcement on residual methyl methacrylate content of denture base polymers

OBJECTIVES Residual methyl methacrylate (MMA) content in unreinforced and in glass fibre reinforced, heat-polymerized (long- and short-term terminal boiled and conventionally) autopolymerized (at room temperature and in water at 60 degrees C) and microwave-polymerized (3min at 500W) denture base polymers after processing were compared. METHODS Ten specimens were prepared for each curing cycle (five unreinforced and five reinforced) adding up to a total of 60. Residual MMA content was determined using high-performance liquid chromatography. Data were analysed with one-way ANOVA followed by Tukey HSD and Paired Samples tests. RESULTS For unreinforced and reinforced groups; residual MMA content succesively ranked from lowest to highest in; long- and short-term terminal boiled heat-polymerized, microwave-polymerized, autopolymerized specimens processed in water at 60 degrees C and conventionally heat- and autopolymerized specimens processed at room temperature. Generally residual MMA was found more in glass fibre reinforced test groups than unreinforced groups. However, when reinforced residual MMA increased significantly in long- and short-term terminal boiled heat- (P<0.05) and microwave-polymerized test groups (P<0.01). CONCLUSIONS Although this increase was significant, lowest residual MMA content was found succesively in reinforced long- and short-term terminal boiled heat-polymerized and microwave-polymerized like in unreinforced groups.

ÇEŞİTLİ KİMYASAL TEMİZLİK SOLÜSYONLARININ AKRİLİK KAİDE MATERYALİNİN YÜZEY SERTLİĞİNE ETKİSİ-THE EFFECT OF VARIOUS CHEMICAL CLEANING SOLUTIONS ON THE SURFACE HARDNESS OF AN ACRYLIC RESIN DENTURE BASE MATERIAL

Ozet Son yillarda, Hepatit B ve kazanilmis immun sistem eksikligi sendromu (AIDS) gibi hastaliklarin gorulme sikliginin ve bu hastaliklarla ilgili bilinclenmenin artmasi capraz enfeksiyon kontrolunun onemini arttirmistir. Ayrica, dis hekimi hastalarina kullanimi kolay, protez kaide maddesine de zarar vermeyen bir temizleyici ajan onermelidir. Ancak, protez temizlik solusyonlarinin protez kaide maddelerinin fiziksel ve mekanik ozelliklerinde bazi degisimlere neden oldugu bildirilmektedir. Bu calismada bes kimyasal temizlik solusyonunun akrilik kaide materyalinin yuzey sertligine etkisi degerlendirilmistir. 1 gun ve 7 gun kimyasal temizlik solusyonlarina daldirma islemleri sonunda, temizlik solusyonunun yapisina bagli olarak yuzey sertlik degerlerinde farkli degisimler belirlenmistir. Ancak, 365 gun gibi uzun sureli daldirma islemi sonunda, bes kimyasal temizlik solusyonunun da deney orneklerinin yuzey sertlik degerlerinde istatistiksel olarak ileri derecede anlamli (p<0.001) azalmaya neden oldugu saptanmistir. Anahtar kelimeler: Kimyasal temizlik solusyonlari, protez kaide maddeleri, yuzey sertligi Abstract The importance of cross-infection control has received an increasing attention in recent years because of the greater incidence and awareness of communicable diseases such as Hepatitis B and acquired immune deficiency syndrome (AIDS). Dentist should advise a cleaning solution which is used esaily and is not harmful to denture base material. However it has been reported that denture cleaning solutions may cause some changes in physical and mechanical properties of denture base materials. In this study, the effects of five chemical cleaning solutions on tJte surface hardness of an acrylic denture base resin material are evaluated. After one day, seven days of immersion periods, due to the composition of the cleaning solution the surface hardness varied. However, after 365 days of immersion the decrease in the surface hardness values with each solution is found to be statistically significant (p<0.001). Key words: Chemical cleaning solutions, denture base nuite-rials, surface hardness

İSKELETSEL ve DİŞSELIII. SINIF BİR OLGUNUN PROTETİK REHABİLİTASYONU-PROSTHETIC REHABILITATION IN TAL AND DENTAL CLASS IU MAL OCCLUSION (A case report)

Ozet Prognatizm ciddi sosyal ve fonksiyonel bir engeldir. Prognatik bir hastanin III. sinif anomaliler hacimsal veya konumsal kaynakli olabilmektedir. Hacimsal anomalilerde mandibulada yapisal bir buyukluk soz konusudur ve bu olgular gercek III. sinif olgulardir. Bu makalede, III. sinif malokluzyonlu yetiskin bir bireyde estetik ve fonksiyonu saglamak amaciyla perio-dontolojik, ortodontik ve protetik kombine bir tedavi yaklasimi anlatilmaktadir. Anahtar sozcukler: III. sinif malokluzyon, ortodontik ve Abstract Prognatiiism The class III anomalies may be in volume or in position. In volumetric anomalies In this article, periodontal, orthodontic and prosthodontic treatment approach as a combined treatment were described to esthetic andfunction of an adult patient with class Hi malocclusion. Key words: Class III malocclusion, orthodontic and periodontal treatment, dentures with precision attachments. is a serious social and functional impediment. Its correction is esential to restore function and esthetics in the oral and behavioral rehabilitation of a prognathous patient. mandibula is bigger than its normal volume and this is the real class III case. oral ve davranissal rehabilitasyonu icin fonksiyon ve estetigini restore etmek gerekir. periodontal tedavi, hassas baglantili protezler.