BACKGROUND:Implant stability is the basic requirement of osseointegration and also one of important parameters to judge whether the implant is implanted successfully. Generaly, the implant stability is closed related to bone quality (bone hardness and bone density) in the implant zone, implant shape, diameter and length. OBJECTIVE:To continuously monitor the changing trend of implant stability during early healing period due to the utilization of osteotome technique by resonance frequency analysis. METHODS:Twenty patients with class Ⅳ defects in the posterior maxila who underwent implant restoration (4.8 mm×12 mm) from 2010 to 2011 at the Department of Stomatology, the 521 Hospital of China North Industries Group Corporation were recruited. Resonance frequency analysis was used to measure the implant stability at implant insertion, 1, 2, 3, 4, 6, 8 and 12 weeks postoperatively. RESULTS AND CONCLUSION:Al the implants achieved osseintegration uneventfuly within 12 weeks. At implant instalation, the mean implant stability quotient value was 69.66±4.75. An increase trend in implant stability quotient values was visible within 1 week, and the implant stability quotient value reached the peaked at 1 week, and then decreased to the lowest point at 2 weeks, which were significantly different from that at implant instalation (P < 0.05). In the secondary stability phase, the increasing slope of implant stability quotient values reached a plateau by the 8th week. The resonance frequency analysis can estimate the quantitative change of implant stability after applying the osteotome technique, and the osteotome technique can promote the implant initial stability.

Objective To study the expression of Nuclear factor E2 related factor 2 (Nrf2) ,Superoxide Dis‐mutas 1 (SOD1) ,and Heme Oxygenase- 1( HO -1) factors related to Nrf2 signaling pathway in noise-induced cochlear injury of rats .Methods A total of 30 SD rats were randomly and equally assigned into the following 2 groups :noise group and normal control group .The rats in noise group were exposed to an 115 dB SPL continuous steady white noise for 12 hours ,then 1 day ,3 days ,and 7 days later ,the rats receveid the ABR and DPOAE testing after noise exposure .Both RT -PCR and Peggy Sue trace protein detection techniques were used to detect gene ex‐pression in Nrf2 /Keapl-ARE signaling pathway and the protein levels by cochlear tissue sampling after noise ex‐posure 7 days later .Results The ABR thresholds in the noise group was higher than those of in normal control group after noise exposure 1 ,3 ,and 7 days later (P<0 .05) .The DPOAE values of noise group were significantly lower than those of normal control group (P<0 .05) .The up -regulation of expression of Nrf2 ,SOD1 ,HO -1 mRNA(1 .11 ± 0 .05 ,1 .45 ± 0 .12 ,1 .15 ± 0 .03) in noise group were higher than those of in the normal control group after noise exposure 7 days later (1 .00 ± 0 .02 ,1 .10 ± 0 .12 ,0 .92 ± 0 .08) ,and the differences were statistically sig‐nificant (P<0 .05) .And in Peggy Sue trace detection system ,we also found SOD1 ,HO -1 protein levels in noise group were higher than those of in normal control group .Conclusion After the noise -induced cochlear injury in rat ,Nrf2 expression in the cochlea increased and up-regulatd expression of downstream gene and protein content such as antioxidant enzymes SOD1 and HO-1gene by regulating Nrf2 /Keapl-ARE signaling pathway ,which may be involved in protection against oxidative stress injury in noise-induced cochlear injury of rat .

AIM: To explore the effects of inflammatory conditions on the pharmacokinetics of methotrexate (MTX) and its related mechanisms. METHODS: The model of adjuvant induced arthritis (AIA) was established. The expression of organic anion transporter 3 (OAT3) in kidney was detected by immunohistochemistry, Western blotting and QPCR. The plasma concentration of MTX was detected by LC-MS/MS, and the pharmacokinetics of MTX after different administration time were compared by isolated rat kidney perfusion, kidney slices, in vitro cell uptake and transport experiments. RESULTS: The expression of OAT3 was significantly increased in the kidneys of AIA rats by immunohistochemistry, Western blotting and QPCR. At the same time, the concentration of MTX was detected by the optimized LC-MS/MS. The results showed that the uptake of MTX in the kidney slices of AIA rats was significantly increased, and Pro could reduce the excretion of MTX by inhibiting OAT3. Furthermore, it was demonstrated in vitro that inflammatory pathology can promote renal excretion of MTX by increasing the expression and functional activity of OAT3.CONCLUSION: Under inflammatory pathological conditions, it can increase the expression of OAT3 in the kidney, enhance its functional activity, accelerate the uptake of MTX by the kidney, and promote the excretion of MTX.