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Effect of doxycycline-containing 35% phosphoric acid on dentin bond strength
d e n t a l m a t e r i a l s 3 3 S ( 2 0 1 7 ) e1–e92
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64 Effect of doxycycline-containing 35% phosphoric acid on dentin bond strength P.H. Freitas 1,2,∗ , C.B. Andre 1 , B.M. Fronza 1 , R. Franc¸a 2 , M. Giannini 1 , S. Consani 1 1
Piracicaba Dental School of State University of Campinas, Brazil 2 University of Manitoba, Canada
http://dx.doi.org/10.1016/j.dental.2017.08.063 63 Phase characterization of Li-Si systems using X-ray photoelectron spectroscopy M. Bebsh, A. Haimeur, R. Franc¸a ∗ Department of Restorative Dentistry, University of Manitoba, Winnipeg, Canada Purpose/aim: Lithium silicate-based glass ceramics (LSGC) have gained much popularity in recent years due to its enhanced strength, durability, aesthetics and versatility. Lithium metasilicate (Li2 SiO3 ) and lithium disilicate (Li2 Si2 O5 ) are two major phases of LSGC systems. Li2 SiO3 is considered an intermediary phase that will contribute to the transformation of a stable crystalline phase of Li2 Si2 O5 . The aim of this study was to quantify the amount of Li2 SiO3 and Li2 Si2 O5 present in four different LSGCs used to fabricate dental restorations, using X-ray photoelectron spectroscopy (XPS) physicochemical characterization. Materials and methods: Four kinds of LSGCs were used ® in this experiment: IPS e.max CAD (Ivoclar-Vivadent), Celtra ® ® ® Duo (Dentsply), Vita Suprinity (Vita Zahnfabrik) and Nice (Straumann). Each LSGC ingot was sectioned into blocks (n = 6) measuring 2 mm of thickness using a Buehler Isomet low ® ® speed saw. IPS e.max CAD and Vita Suprinity were crys® tallized according to manufacturer’s instructions. Celtra Duo ® and Nice were tested as received. Physicochemical analyses were performed using XPS, the parameters were: X-ray gun emission set to 15 mA and an X-ray gun anode HT set to 15 kV with power setting 225 W and base pressure of 2 × 10−9 Torr. Etching was performed using an argon (Ar) gun and performed in 10 nm, 50 nm or 100 nm depth. The deconvolution of high resolution Li 1s and Si 2p peaks were performed in each depth. Results: XPS results reveal presence of Li2 SiO3 in all LSGCs ® tested. After crystallization process IPS e.max CAD and Vita ® Suprinity displayed 8.9% (±0.3) and 16.9% (±0.6) of Li2 SiO3 ® phase, respectively. Pre-crystallized blocks like Celtra Duo showed 18.2% (± 0.2) of Li2 SiO3 phase. Conclusions: With the limitations of this study, it is possible to conclude that lithium metasilicate phase (Li2 SiO3 ) can be detected after final crystallization process. http://dx.doi.org/10.1016/j.dental.2017.08.064
Purpose/aim: This study evaluated the effect of etching using 2%, 5% and 10% doxycycline-containing 35% phosphoric acid on resin-dentin micro-tensile bond strength. Materials and methods: The dentin surface of eighty noncarious human third molars were exposed and then etched using 2%, 5% and 10% doxycycline-containing 35% phosphoric acid for 15 s. A 35% phosphoric acid with no doxycycline was used as a control group. After rinsing with water, the dentin was bonded with Single Bond Plus (3M ESPE) and composite build-up was constructed, followed by polymerization. The teeth were sectioned and the bonds were tested for microtensile bond strength (TBS) at 24 h and 1 year. Results: The groups did not show statistical difference among them at 24 h of water storage. However, acid-etching using the 10% doxycycline/35% phosphoric acid did not lower the TBS after 1 year and had statistically higher values compared to the control and 2% doxycycline/35% phosphoric acid groups. Conclusions: Ten percent doxycycline-containing 35% phosphoric acid can produce stable resin-dentin without requiring additional steps in the bonding procedure. Table 1 – Means and standard deviations of the resin–dentin micro-tensile bond strength of different doxycycline-containing 35% phosphoric acid.
Identical capital letters in a column indicate the absence of any statistically significant difference. Identical lower cased in a row within the same etchant between 24 h and 1 year indicate the absence of any statistically significant difference.
http://dx.doi.org/10.1016/j.dental.2017.08.065
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64 Effect of doxycycline-containing 35% phosphoric acid on dentin bond strength P.H. Freitas 1,2,∗ , C.B. Andre 1 , B.M. Fronza 1 , R. Franc¸a 2 , M. Giannini 1 , S. Consani 1 1
Piracicaba Dental School of State University of Campinas, Brazil 2 University of Manitoba, Canada
http://dx.doi.org/10.1016/j.dental.2017.08.063 63 Phase characterization of Li-Si systems using X-ray photoelectron spectroscopy M. Bebsh, A. Haimeur, R. Franc¸a ∗ Department of Restorative Dentistry, University of Manitoba, Winnipeg, Canada Purpose/aim: Lithium silicate-based glass ceramics (LSGC) have gained much popularity in recent years due to its enhanced strength, durability, aesthetics and versatility. Lithium metasilicate (Li2 SiO3 ) and lithium disilicate (Li2 Si2 O5 ) are two major phases of LSGC systems. Li2 SiO3 is considered an intermediary phase that will contribute to the transformation of a stable crystalline phase of Li2 Si2 O5 . The aim of this study was to quantify the amount of Li2 SiO3 and Li2 Si2 O5 present in four different LSGCs used to fabricate dental restorations, using X-ray photoelectron spectroscopy (XPS) physicochemical characterization. Materials and methods: Four kinds of LSGCs were used ® in this experiment: IPS e.max CAD (Ivoclar-Vivadent), Celtra ® ® ® Duo (Dentsply), Vita Suprinity (Vita Zahnfabrik) and Nice (Straumann). Each LSGC ingot was sectioned into blocks (n = 6) measuring 2 mm of thickness using a Buehler Isomet low ® ® speed saw. IPS e.max CAD and Vita Suprinity were crys® tallized according to manufacturer’s instructions. Celtra Duo ® and Nice were tested as received. Physicochemical analyses were performed using XPS, the parameters were: X-ray gun emission set to 15 mA and an X-ray gun anode HT set to 15 kV with power setting 225 W and base pressure of 2 × 10−9 Torr. Etching was performed using an argon (Ar) gun and performed in 10 nm, 50 nm or 100 nm depth. The deconvolution of high resolution Li 1s and Si 2p peaks were performed in each depth. Results: XPS results reveal presence of Li2 SiO3 in all LSGCs ® tested. After crystallization process IPS e.max CAD and Vita ® Suprinity displayed 8.9% (±0.3) and 16.9% (±0.6) of Li2 SiO3 ® phase, respectively. Pre-crystallized blocks like Celtra Duo showed 18.2% (± 0.2) of Li2 SiO3 phase. Conclusions: With the limitations of this study, it is possible to conclude that lithium metasilicate phase (Li2 SiO3 ) can be detected after final crystallization process. http://dx.doi.org/10.1016/j.dental.2017.08.064
Purpose/aim: This study evaluated the effect of etching using 2%, 5% and 10% doxycycline-containing 35% phosphoric acid on resin-dentin micro-tensile bond strength. Materials and methods: The dentin surface of eighty noncarious human third molars were exposed and then etched using 2%, 5% and 10% doxycycline-containing 35% phosphoric acid for 15 s. A 35% phosphoric acid with no doxycycline was used as a control group. After rinsing with water, the dentin was bonded with Single Bond Plus (3M ESPE) and composite build-up was constructed, followed by polymerization. The teeth were sectioned and the bonds were tested for microtensile bond strength (TBS) at 24 h and 1 year. Results: The groups did not show statistical difference among them at 24 h of water storage. However, acid-etching using the 10% doxycycline/35% phosphoric acid did not lower the TBS after 1 year and had statistically higher values compared to the control and 2% doxycycline/35% phosphoric acid groups. Conclusions: Ten percent doxycycline-containing 35% phosphoric acid can produce stable resin-dentin without requiring additional steps in the bonding procedure. Table 1 – Means and standard deviations of the resin–dentin micro-tensile bond strength of different doxycycline-containing 35% phosphoric acid.
Identical capital letters in a column indicate the absence of any statistically significant difference. Identical lower cased in a row within the same etchant between 24 h and 1 year indicate the absence of any statistically significant difference.
http://dx.doi.org/10.1016/j.dental.2017.08.065