Microleakage of Indirect Composite Resin Luted WithDifferent Adhesive Cements

Objective: To evaluate the influence of different adhesive cements on the microleakage of proximal surfaces in class II indirectcomposite resin restorations. Material and methods: Twenty-four human extracted caries-free third molars were selected. Standard class II cavities were preparedon the mesial and distal surfaces with margins located above the cementoenamel junction (CEJ). Cavities were standardized by fixingthe handpiece in a parallelometer during preparation. Treatment groups were divided into 4 cements: GCem LinkAce (GCm) (GC,Japan), Panavia F 2.0 (P) (Kuraray, Japan), RelyX U200 (Rx) (3M ESPE, USA), Superbond C;B (SB) (SunMedical, Japan) andcontrol (V) (Variolink II, Ivoclar Vivadent, Schaan, Liechtenstein). In each tooth, the mesial cavity was set as the experimental and thedistal as a control. Restorations were fabricated with an indirect composite resin (Gradia; GC, Japan) and luted into cavities.Specimens were thermocycled (5-55Cº,5000 cycles) and immersed in 50% silver nitrate solution for 24 hours. The teeth weresectioned mesiodistally and evaluated for microleakage using digital image analysis (24x; Leica optical microscope, Germany). Theordinal scale used was: 0-4 (0= no microleakage and 4= dye penetration along axial wall). Mean values for each group were recordedand statistically analyzed using Wilcoxon Signed Ranks Test. (alpha=0,05) Results: There were no significant differences among occlusal microleakage of all groups (GCm:0; P: 0,17±.0,4; Rx:0 andSB:0,17±.0,4) (P>0,05). The least microleakage (?m±SD) was recorded for GCm and Rx self-adhesive cements for occlusal (0.00;0,00) and gingival (0,83±0,4; 0,50±0,5) parts, respectively. The highest microleakage was noted with SB and P at the gingival parts(2,0±1,4; 1,5±0,84), respectively and the difference was significant compared to the other groups (P0,05).Conclusions: Tested self-adhesive dual-curing resin cements exhibited simulated long-term microleakage stability while self-curingresin cement yielded highest microleakage.

Comparison of Mouth Opening Angle Between Dentate and Edentulous Subjects

WOS: 000208022500006PubMed ID: 19697645Angle of mouth opening provides information concerning temporomandibular joint mobility. The aim of this study was to compare angle of mouth opening of dentate and edentuluous subjects at similar ages. Eighty (80) subjects, 24 women and 16 men (mean age 51.2 yrs.) for the dentate group and 21 women and 19 men (mean age 52.3 yrs.) for the edentuluous group participated in the study. The angle of mouth opening measurements were performed with a mandibular goniometer at four independent sessions of three measurements. The angle of mouth opening values of the dentate group were significantly higher than that of the edentulous group. The results of this study revealed that tooth loss resulted in a decrease in angle of mouth opening values independent of gender and age. The clinical implications of this finding is that oral function might well be preserved with advancing age if dentition is maintained in good condition

A Comparison Of The Performance Of Different Resin Luting Cements After Thermomechanical Aging

Amaç: Termomekanik yaşlandırmanın farklı adeziv reziv simanların mikroçekme bağ dayanımı ve nanosızıntı miktarları üzerine etkisini incelemektir. Yöntem: Otuz adet çekilmiş üçüncü molar diş düz bir dentin yüzeyi elde etmek için su soğutması altında kesildi. Daha sonra kompozit örnekler kesilen dişlere farklı adeziv rezin simanlarla yapıştırıldı. Elde edilen örnekler kullanılan yapıştırma simanlarına göre beş gruba ayrıldı; 1-Variolink II-konvansiyonel "asitle ve yıka" rezin siman, 2-Multilink-kendinden asitli rezin siman, 3-Panavia F2.0-kendinden asitli rezin siman, 4RelyX U200-kendinden adezivli rezin siman, 5-SuperBond C&B-konvansiyonel "asitle ve yıka" rezin siman. Her yapıştırma simanı grubu kendi içinde kontrol grubu ve çalışma (termomekanik yaşlandırma) alt grubuna ayrıldı. Kontrol grubundaki örneklere herhangi bir yaşlandırma işlemi uygulanmadı. Çalışma grubundaki örneklere 5-55ºC'de 10.000 defa termal ve 50 N'da 50.000 defa mekanik işlemi uygulandı. Örnekler %50'lik amonyaklı gümüş nitrat solüsyonunda 24 saat bekletildikten sonra bağlanma direnci testi uygulandı ve FEI-SEM/EDX ile incelendi. Bulgular: Mikroçekme bağ dayanımı ve nanosızıntının yaşlandırma işleminden etkilenmediği görüldü (p0,05), fakat rezin yapıştırma simanları arasında anlamlı bir fark bulundu (p0,05). Sonuç: yaşlandırmadan etkilenmediği tespit edildi ve adeziv rezin simanın restorasyonun uzun ömürlü olmasında etkili olduğu sonucuna varıldıObjectives: To investigate the effects of the thermomechanical aging on microtensile bond strength and nanoleakage of different adhesive resin luting cements. Methods: Thirty human third molar teeth were cut under water cooling to obtain flat dentine surface. Then composite specimens were adhered onto prepared teeth with different adhesive resin cements. Samples were divided into five groups according to the luting cements used; 1-Variolink II-convantional etch-and-rinse resin cement, 2-Multilink-selfetch resin cement, 3-Panavia F2.0-self-etch resin cement, 4-RelyX U200-self-adhesive resin cement, 5-SuperBond C&B-conventional etc-and-rinse resin cement. Each resin cement group was separated into two subgroups as control and thermomechanical aging group. No thermomechanical aging was applied to the samples in the control group. Samples in thermomechanical aging group were subjected to 10.000 thermocycles at 5-55ºC and 50.000 loadingcycles using a loading force of 50 N. After samples were immersed in a solution consisting of 50% ammoniac silver nitrate for 24h, bond strength test was performed and samples were observed under FEI-SEM/EDX. Results: It was seen that microtensile bond strength and nanoleakage were not significantly affected by aging (p0,05), but a significant difference was found among the luting resin cements (p0,05). Conclusion: It was determined that the performance of resin luting cements used in this study was not affected by thermomechanical aging and concluded that the type of adhesive resin cement is effective on longevity of the restoratio

A Comparison Of The Performance Of Different Resin Luting Cements After Thermomechanical Aging

Amaç: Termomekanik yaşlandırmanın farklı adeziv reziv simanların mikroçekme bağ dayanımı ve nanosızıntı miktarları üzerine etkisini incelemektir. Yöntem: Otuz adet çekilmiş üçüncü molar diş düz bir dentin yüzeyi elde etmek için su soğutması altında kesildi. Daha sonra kompozit örnekler kesilen dişlere farklı adeziv rezin simanlarla yapıştırıldı. Elde edilen örnekler kullanılan yapıştırma simanlarına göre beş gruba ayrıldı; 1-Variolink II-konvansiyonel "asitle ve yıka" rezin siman, 2-Multilink-kendinden asitli rezin siman, 3-Panavia F2.0-kendinden asitli rezin siman, 4RelyX U200-kendinden adezivli rezin siman, 5-SuperBond C&B-konvansiyonel "asitle ve yıka" rezin siman. Her yapıştırma simanı grubu kendi içinde kontrol grubu ve çalışma (termomekanik yaşlandırma) alt grubuna ayrıldı. Kontrol grubundaki örneklere herhangi bir yaşlandırma işlemi uygulanmadı. Çalışma grubundaki örneklere 5-55ºC'de 10.000 defa termal ve 50 N'da 50.000 defa mekanik işlemi uygulandı. Örnekler %50'lik amonyaklı gümüş nitrat solüsyonunda 24 saat bekletildikten sonra bağlanma direnci testi uygulandı ve FEI-SEM/EDX ile incelendi. Bulgular: Mikroçekme bağ dayanımı ve nanosızıntının yaşlandırma işleminden etkilenmediği görüldü (p>=0,05), fakat rezin yapıştırma simanları arasında anlamlı bir fark bulundu (p>=0,05). Sonuç: yaşlandırmadan etkilenmediği tespit edildi ve adeziv rezin simanın restorasyonun uzun ömürlü olmasında etkili olduğu sonucuna varıldıObjectives: To investigate the effects of the thermomechanical aging on microtensile bond strength and nanoleakage of different adhesive resin luting cements. Methods: Thirty human third molar teeth were cut under water cooling to obtain flat dentine surface. Then composite specimens were adhered onto prepared teeth with different adhesive resin cements. Samples were divided into five groups according to the luting cements used; 1-Variolink II-convantional etch-and-rinse resin cement, 2-Multilink-selfetch resin cement, 3-Panavia F2.0-self-etch resin cement, 4-RelyX U200-self-adhesive resin cement, 5-SuperBond C&B-conventional etc-and-rinse resin cement. Each resin cement group was separated into two subgroups as control and thermomechanical aging group. No thermomechanical aging was applied to the samples in the control group. Samples in thermomechanical aging group were subjected to 10.000 thermocycles at 5-55ºC and 50.000 loadingcycles using a loading force of 50 N. After samples were immersed in a solution consisting of 50% ammoniac silver nitrate for 24h, bond strength test was performed and samples were observed under FEI-SEM/EDX. Results: It was seen that microtensile bond strength and nanoleakage were not significantly affected by aging (p?0,05), but a significant difference was found among the luting resin cements (p?0,05). Conclusion: It was determined that the performance of resin luting cements used in this study was not affected by thermomechanical aging and concluded that the type of adhesive resin cement is effective on longevity of the restoratio