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    Does chlorhexidine affect the shear bond strengths of orthodontic brackets?
    (Elsevier Taiwan, 2011) Catalbas, Bulent; Ercan, Ertugrul; Dalli, Mehmet; Gelgor, Ibrahim Erhan; Erdemir, Ali
    Background/purpose: The purpose of this study was to examine the effect of 1% chlorhexidine (CHX) gel on the shear bond strength (SBS) of orthodontic brackets bonded with Transbond XT (XT, 3M Unitek) and Transbond Plus Self-Etching Primer (TSEP, 3M Unitek). Materials and methods: In total, 75 extracted premolars were collected and randomly divided into five groups of 15 teeth each. Brackets were bonded to teeth using a different experimental technique for each group as follows: (I) (control): etch/dry/Transbond XT; (II) CHX gel/etch/dry/Transbond XT; (III) etch/dry/CHX gel/Transbond XT; (IV) dry/TSEP; and (V) CHX gel/dry/TSEP. All products were used according to the manufacturers' instructions. An Instron Universal Testing Machine was used to directly apply an occlusal shear force onto the enamel-bracket interface at a speed of 0.5 mm/min. Residual adhesive on each tooth was evaluated using an adhesive remnant index (ARI). Analysis of variance was used to compare the SBS of the groups, and a Chi-squared test was used to compare ARI scores. Results: Group I had the highest mean SBS (16.47 +/- 4.2 MPa), followed by Groups II (16.24 +/- 4.5 MPa), III (13.08 +/- 4.50 MPa), IV (11.95 +/- 2.7 MPa) and V (11.16 +/- 2.8 MPa). No statistical differences were observed between Groups I and II (P > 0.05) or between groups IV and V (P > 0.05). However, SBS scores for Groups IV and V were significantly lower than those of Groups I and II (P > 0.05). No significant difference was observed in ARI scores among any of the groups (P > 0.05). Prior application of CHX gel did not significantly affect the SBS of orthodontic bonding adhesives. Conclusions: CHX gel is thought to obviate initial caries lesions during fixed orthodontic treatment. Copyright (C) 2011, Association for Dental Sciences of the Republic of China. Published by Elsevier Taiwan LLC. All rights reserved.
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    Öğe
    Effect of Different Cavity Disinfectants on Shear Bond Strength of Composite Resin to Dentin
    (Quintessence Publishing Co Inc, 2009) Ercan, Ertugrul; Erdemir, Ali; Zorba, Yahya Orcun; Eldeniz, Ayce Unverdi; Dalli, Mehmat; Ince, Bayram; Kalaycioglu, Baris
    Purpose: The aim of this study was to evaluate the effect of different cavity disinfectants on dentin bond strengths of composite resin applied with two different adhesive systems. Materials and Methods: One hundred mandibular third molars were sectioned parallel to the occlusal surface to expose midcoronal dentin. The dentin surfaces were polished with waterproof-polishing papers The specimens were randomly divided into 5 groups of 20 each. In group 1, the specimens were not treated with any cavity disinfectants and served as control. From groups 2 to 5. dentin surfaces were treated with the following cavity disinfectants, respectively; 2% chlorhexidine solution, 2.5% NaOCl, 1% chlorhexidine gel, 3% H2O2. The specimens were then randomly divided into 2 subgroups including ten teeth each to evaluate the effect of different bonding systems Dentin bonding systems were applied to the dentin surfaces and the composite buildups were created After the specimens were stored in an incubator for 24 h. the shear bond strength was measured at a crosshead speed of 1 mm/min. The bond strength data were analyzed with one way analysis of variance and Tukey-HSD tests. Results: There was no significant difference between chlorhexidine gel and control groups regardless of the type of the bonding agent (p > 0.05). On the other hand, pretreatment with NaOCl, H2O2 or chlorhexidine solutions had a negative effect on the shear bond strength of self-etching bonding systems Conclusion: The findings of this study suggest that when NaOCl, H2O2 or chlorhexidine solution Eire used as a cavity disinfectant, an etch-and-rinse bonding system should be preferred
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    Öğe
    Farklı tipteki II. sınıf kavite dizaynı kullanılan dişlerin kırılma dirençlerinin değerlendirilmesi
    (2007) Dallı, Mehmet; Zorba, Yahya Orçun; Ercan, Ertuğrul; Erdemir, Ali
    Bu çalışmanın amacı; farklı yöntemlerle hazırlanan II. sınıf kavitelere uygulanan posterior restoratif materyallerin kırılma dayanıklılıklarının değerlendirilmesidir. Bu çalışmada 40 adet çürüksüz yeni çekilmiş insan premolar dişi kullanıldı. Dişler her bir grupta 10 adet diş olacak şekilde rastgele dört gruba ayrıldı. Grup 1 kontrol grubu olarak ayrıldı ve herhangi bir işlem uygulanmadı. Grup 2, 3 ve 4 teki dişlerde sırasıyla klasik sınıf II kavite, modifiye sınıf II kavite ve tünel kaviteler hazırlandı. Kavite preparasyonları hazırlandıktan sonra dişler posterior kompozit (Dentsply, Kontstanz, Germany) ile restore edildi. Örnekler Instron test cihazına bağlandı ve okluzal yüzeyleri kırılma görülene kadar 1mm/dk hızla sıkıştırma kuvvetlerine maruz bırakıldı. Örneklerin kırılması için gerekli olan sıkıştırma kuvvetleri Newton olarak kaydedildi. Elde edilen veriler tek yönlü varyans analizi ve Tukey testleri kullanılarak istatistiksel olarak analiz edildi. Her gruptaki örneklerin kırılması için gerekli ortalama kuvvetler şu şekilde belirlendi. Grup 1: 828.23±118.21, Grup 2: 779.32±139.99, Grup 3: 799.82±117.26, Grup 4: 805.39±108.68. Gruplar arasında istatistiksel olarak önemli bir farklılık bulunamadı (p>0.05). Sonuç olarak dişlerin restorasyonunda farklı kavite dizaynlarının kullanılmasının dişlerin kırılma dayanımında etkili olmadığı bulundu.