Farklı direct bonding malzemelerinin tutuculukları ve mine yüzeylerinden temizlenme yöntemleri yönünden karşılaştırılması
Comparison of various direct bonding agents from the point of bond strength and debonding methods
- Tez No: 355219
- Danışmanlar: YRD. DOÇ. DR. KEREM ARAS
- Tez Türü: Doktora
- Konular: Diş Hekimliği, Dentistry
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1998
- Dil: Türkçe
- Üniversite: Marmara Üniversitesi
- Enstitü: Sağlık Bilimleri Enstitüsü
- Ana Bilim Dalı: Ortodonti Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 130
Özet
Özet yok.
Özet (Çeviri)
In fixed orthodontic treatment, composites are the most commonly used bonding agents for direct bonding purposes. When composites are used in direct bonding, the result could be irreversable enamel surface loss. These loses can be seen in; etching before direct bonding, cleaning the remaining bonding agent, enamel surface loss due to rebonding, caries and decalcifications around the brackets. To reduce the enamel surface loss to a minimum level in direct bonding, resin reinforced glass ionomer cements (resin ionomers) were used. The aim of this study is to compare composite resins with resin ionomers in respect to shear - tensile bond strengths, enamel loss and enamel cleaning procedures in direct bonding. The study was conducted on 145 human premolars which were extracted as the part of orthodontic treatment, from the patients of Marmara University Dentistry Faculty Department of Orthodontics.“Unitek Multi-Cure Glass lonomer Cement”,“Fuji Ortho LC”resin ionomer cement and“Transbond )(T' composite resin were used on different enamel surfaces for direct bonding purposes. The brackets on the samples were debonded by Instron Universal Test Instrument by using shear or tensile force. Remaining bonding materials on the samples were inspected using light microscope and than scored to show the failure sites of the groups. Remaining bonding materials on samples than were cleaned by using scaler for a short time period if need arised tungsten carbid airotor bur was used right after scaler. After these procedures enamel surfaces were inspected using SEM. A decision on the suitability of the bonding agents in direct bonding was tried to be given comparing the results of the bond strength, enamel surface cleaning procedures and enamel surface loss. In tests where shear bond strength was used, the bond strengths within groups were compared by using Kruskal - Wallis non parametric variant analysis. In tests where tensile bond strength was used, the bond strengths within groups were compared by using one way ANOVA. To determine the effect of the debonding method on bond strength for each group, Mann - Whitney or unpaired t-tests were used. The bonding agents failure sites were statistically evaluated by using Chi square test. The statistically significant results of this in vitro study are as follows: When the enamel surfaces were etched before direct bonding, shear bond strengths of ”Unitek Multi-Cure Glass lonomer Cement“ and ”FUJI ORTHO LC“ resin ionomer cement remained unchanged and their tensile bond strengths increased. When etched or nonetched enamel surfaces were contaminated with saliva before direct bonding, shear bond strengths of ”FUJI ORTHO LC“ resin ionomer cement remained unchanged. When etched enamel surfaces are contaminated with saliva before direct bonding with ”FUJI ORTHO LC" resin ionomer cement, tensile bond strength of non etched group falls whereas etched group remains unchanged. For groups 3MN, FES, and TR, shear bond strength was more than tensile bond strength whereas for groups 3ME, FEM,FNM and FES there was no difference between tensile bond strength and shear bond strength. Shear bond strength of 3ME, 3MN, FEM groups and tensile bond strength of 3ME, FEM, FNM, FES groups were found to be sufficient. In all groups where shear force was used for debonding, remaining bonding materials on the enamel surface was less than where tensile force was used. After shear force was applied for debonding, remaining bonding materials were able to be cleaned with scaler in groups FEM, FES, FNS, 3MN whereas tungsten carbide bur had to be used for groups TR, FNM and 3ME. After tensile force was applied for debonding, remaining bonding materials were able to be cleaned with scaler in groups FNM, FNS, 3MN whereas tungsten carbide bur had to be used for groups TR, FEM, FES and 3ME.
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