Objective To investigate fracture resistance and fracture patterns of maxillary anterior endodontically treated teeth restored with two different shapes of glass fiber post systems.Methods Twenty-four human sound maxillary anterior teeth of similar size were collected,and randomly divided into 3 groups,8 teeth each.After endodontical treatment,they were given the following treatments:Group A:parallel glass fiber posts (coltene parapost fiber lux) and composite core;Group B:taper glass fiber posts (coltene parapost taper lux) and composite core; Group C (control group):intact endodontically treated teeth.Teeth in Groups A and B reserved 2 mm dentin ferrule.Then the teeth were prepared and restored with IPS e.max Press all ceramic crowns.All the teeth were embedded in acrylic resin 2 mm below the cementoenamel junction (CEJ),with the silicon impression material stimulating periodontal membrane.All the specimen were loaded under a universal testing machine,at the palatal junction of incisor third and middle third,with an angle of 135 degree to the longitudinal axis of the tooth until fracture occurred,at a cross-head speed of 1.0 mm/min.Fracture loads and patterns were recorded.Statistical analysis was performed using SPSS software.Results The mean fracture loads in the three groups were as follows:(468.8±142.5) N,(440.2±202.7) N,and (459.0±147.6) N,respectively.There was no significant difference in fracture loads among groups (P＞0.05).The incidence of unfavorable fracture in Group A was higher than Groups B and C.Conclusions There is no significant difference in fracture strength between parallel and taper fiber post groups.However,the group with parallel fiber posts demonstrates a higher risk of unfavorable fracture than the group with taper fiber posts,which indicates that taper fiber posts are more favorable to preserve the remaining tooth structure.

Objective To study the characteristics of auditory brainstem response by chirp and click stimuli in normal hearing children.Methods A total of 97 children (194 ears)with normal hearing were recruited,including 50 male (100 ears),and 47 female (94 ears).The CE-chirp and the click acoustic stimulation were used to,and the ABR waveforms and latencies were obtained.ResuIts The chirp-ABR Ⅰ wave recognition rate (36%)was significantly lower than that of click-ABR (100%).At 80 dB nHL,chirp-ABR V wave latency was shorter than click-ABR,the difference was statistically significant (P< 0.05 ).The chirp and click ABR V wave response thresholds showed no significant difference (P>0.05).At 80 dB nHL,no statistical significance of two kinds of a-coustic stimulation of ABR V wave amplitude difference (P>0.05).At 50 dB nHL,chirp-ABR significantly in-creased than click-ABR V wave amplitude with statistically significant differences (P<0.05).At 80,and 50 dB nHL,chirp-ABR showed no differences in the amplitude of V wave (P>0.05 ).ConcIusion The chirp acoustic stimulation produced the larger response amplitude,and was faster,demonstrating the noticeable advantages to tes-ting children.

Objective To investigate the adjustment of miRNA-155 on CD4+ CD25+ Treg regulative T cell in peripheral blood in patients with acute cerebral infarction (ACI) and its pathogenesis. Methods Sixty patients with ACI were divided into three groups according to clinical neurological deficit score. Twenty healthy volunteers were enrolled into the control group. The expression levels of plasma miR-155 mRNA and Foxp3 mRNA were detected by real-time quantitative PCR(qRT-PCR). IL-10 levels in plasma were detected by ELISA. Results Expression of miR-155, Treg, Foxp3 mRNA and levels of IL-10 were significantly increased in patients with ACI compared with normal control group, with statistical differences; Expression of miR-155, Treg, Foxp3 mRNA and levels of IL-10 were gradually increased. The values showed significant statistical difference among the mild, moderate and severe ACI groups (P < 0.01). Among the patients,the levels of miR-155, Treg, Foxp3 mRNA and levels of IL-10 in the survival group were obviously lower than those in the non (P<0.05 or P<0.01). There was a positive correlation between miR-155 and Treg, Foxp3 mRNA (P < 0.01). Conclusion This study suggests that miR-155 is involved in the cell proliferation regulation of CD4+ CD25+ Treg cells,and plays some role in the immunological dissonance with ACI.

Objective To investigatethe quality of life of patients with oral cancer in different period in a hospital, and to explore the impact of patients' psychological status on their quality of life. Methods 50 cases of oral cancer patients in our hospital were investigated in this study by Convenience sampling method. The scale of the hospital anxiety and Depression Scale (HADS, the Japanese version), the quality of life of cancer patients were measured by the scale (FACT-G); the functional evaluation of tumor therapy- head and neck questionnaire (FACT-H&N). Results The comparison of HADS score between patients before and after surgery showed that the improvement of mental status was not obvious in the postoperative patients.The scores of HADS between patients before surgery and after hospital showed that the improvement of mental status was obvious (t=-2.809, P=0.01; t=-3.828, P=0.003). There were significant differences in HADS anxiety and depression-related factors between different periods (F=7.644,P=0.001;F=6.442,P=0.002);Before surgery,patients with low anxiety and depression had higher scores in both emotional and physical functional dimensions, and the difference between the two groups was statistically significant (t=7.882,5.847,6.870,7.262, P<0.05 or 0.01). The scores of the two groups were higher in the whole life quality dimension after surgery,and the difference between the two groups was statistically significant(t=3.640-7.931,P<0.01 or 0.01).There were significant differences in body function and psychological function scores between different periods(F=8.569, P=0.000; F=10.250, P=0.003). Conclusions Oral cancer patients have a higher level of anxiety and depression before and after surgery, and psychological status of patients with a certain impact on quality of life, it should be targeted for individual characteristics of patients with targeted care measures to improve the psychological status of patients,thereby improving the quality of life of patients.

OBJECTIVE To explore the efficacy， safety and economics of a dual therapy consisting of conventional dose of vonoprazan combined with conventional dose of amoxicillin in patients with primary treatment of Helicobacter pylori （HP） infection. METHODS Using a prospective cohort study， the patients diagnosed with HP infection and receiving initial treatment in Chengdu Xinhua Hospital from July 2021 to July 2022 were collected according to inclusion and exclusion criteria. The patients were given vonoprazan/amoxicillin dual therapy （i.e. VA group， Vonoprazan fumarate tablets 20 mg， once a day+Amoxicillin capsules 1.0 g， twice a day， 14 days） and bismuth-containing quadruple therapy （i.e. LJAF group， Rabeprazole sodium enteric- coated tablets 20 mg， twice a day+Colloidal bismuth pectin capsules 200 mg， twice a day+Amoxicillin capsules 1.0 g， twice a day+ Furazolidone tablets 100 mg， twice a day， for 14 days） according to the patient’s medication willingness. Four weeks after the end of the treatment， HP eradication rates of the two groups were compared by using intention-to-treat （ITT）， modified intention-to- treat （MITT） and per-protocol （PP） analysis. The occurrence of adverse drug reactions （ADR） was recorded， and an economic evaluation was performed for them. RESULTS Among the 58 patients in VA group， 55 completed the trial， 2 were lost to follow- up and one withdrew due to rash； among the 62 patients in LJAF group， 57 completed the trial， 3 were lost to follow-up and 2 withdrew due to rash. Results of ITT， MITT and PP analysis showed that HP eradication rates of VA group were 86.2%， 89.3% and 90.9%， and those of LJAF group were 87.1%，91.5% and 94.7%， respectively； there was no statistical significance among different groups （P＞0.05）. The incidences of ADR in VA group and LJAF group were 6.9% and 14.5%，which were not significantly different （P＞0.05）. The result of cost minimization analysis showed that the treatment cost of VA group was 340.9 yuan， which was lower than 373.5 yuan of LJAF group. CONCLUSIONS In patients with primary treatment of HP infection， the efficacy and safety of dual therapy of conventional dose of vonoprazan combined with conventional dose of amoxicillin is equivalent to the bismuth-containing quadruplex therapy with low cost.