With MoS2 as saturable absorber, passive Q-switching and Q-switched mode-locking operations of a Tm-doped calcium lithium niobium gallium garnet（Tm:CLNGG） laser were experimentally demonstrated. The Q-switched laser...With MoS2 as saturable absorber, passive Q-switching and Q-switched mode-locking operations of a Tm-doped calcium lithium niobium gallium garnet（Tm:CLNGG） laser were experimentally demonstrated. The Q-switched laser emitted a maximum average output power of 62 mW and highest pulse energy of 0.72 μJ. Q-switched mode locking was also obtained in the experiment. The research results will open up applications of MoS2 at the mid-infrared wavelength.展开更多
Dentin bonding is a dynamic process that involves the penetration of adhesive resin monomers into the extrafibrillar and intrafibrillar demineralized collagen matrix using a wet-bonding technique.However,adhesive resi...Dentin bonding is a dynamic process that involves the penetration of adhesive resin monomers into the extrafibrillar and intrafibrillar demineralized collagen matrix using a wet-bonding technique.However,adhesive resin monomers lack the capacity to infiltrate the intrafibrillar space,and the excess water that is introduced by the wet-bonding technique remains at the bonding interface.This imperfectly bonded interface is inclined to hydrolytic degradation,severely jeopardizing the longevity of bonded clinical restorations.The present study introduces a dentin bonding scheme based on a dry-bonding technique,combined with the use of extrafibrillar demineralization and a collagen-reactive monomer(CRM)-based adhesive(CBA).Selective extrafibrillar demineralization was achieved using 1-wt%high-molecular weight(MW)carboxymethyl chitosan(CMCS)within a clinically acceptable timeframe to create a less aggressive bonding substance for dentin bonding due to its selectively extrafibrillar demineralization capacity.CMCS demineralization decreased the activation of in situ collagenase,improved the shrinking resistance of demineralized collagen,and thus provided stronger and more durable bonding than traditional phosphoric acid etching.The new dentin bonding scheme that contained CMCS and CBA and used a dry-bonding technique achieved an encouraging dentin bonding strength and durability with low technical sensitivity.This bonding scheme can be used to improve the stability of the resin-dentin interface and foster the longevity of bonded clinical restorations.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 61008018 and 11421064)the National Basic Research Program of China (Grant No. 2013CBA01505)
文摘With MoS2 as saturable absorber, passive Q-switching and Q-switched mode-locking operations of a Tm-doped calcium lithium niobium gallium garnet（Tm:CLNGG） laser were experimentally demonstrated. The Q-switched laser emitted a maximum average output power of 62 mW and highest pulse energy of 0.72 μJ. Q-switched mode locking was also obtained in the experiment. The research results will open up applications of MoS2 at the mid-infrared wavelength.
基金This work was supported by National Natural Science Foundation of China(81720108011,81801009,81460107,81970972 and 82001110)the program for Changjiang Scholars and Innovative Research Team in University(No.IRT13051).
文摘Dentin bonding is a dynamic process that involves the penetration of adhesive resin monomers into the extrafibrillar and intrafibrillar demineralized collagen matrix using a wet-bonding technique.However,adhesive resin monomers lack the capacity to infiltrate the intrafibrillar space,and the excess water that is introduced by the wet-bonding technique remains at the bonding interface.This imperfectly bonded interface is inclined to hydrolytic degradation,severely jeopardizing the longevity of bonded clinical restorations.The present study introduces a dentin bonding scheme based on a dry-bonding technique,combined with the use of extrafibrillar demineralization and a collagen-reactive monomer(CRM)-based adhesive(CBA).Selective extrafibrillar demineralization was achieved using 1-wt%high-molecular weight(MW)carboxymethyl chitosan(CMCS)within a clinically acceptable timeframe to create a less aggressive bonding substance for dentin bonding due to its selectively extrafibrillar demineralization capacity.CMCS demineralization decreased the activation of in situ collagenase,improved the shrinking resistance of demineralized collagen,and thus provided stronger and more durable bonding than traditional phosphoric acid etching.The new dentin bonding scheme that contained CMCS and CBA and used a dry-bonding technique achieved an encouraging dentin bonding strength and durability with low technical sensitivity.This bonding scheme can be used to improve the stability of the resin-dentin interface and foster the longevity of bonded clinical restorations.
