OBJECTIVE: To assess the effect of disinfectant (Cavicide) with benzethon chloramine and isopropanol as main active ingredients disinfectant on dental impression accuracy. METHODS: The effect of Cavicide on three impression materials (alginate, polyether and vinylpolysiloxane) were assessed using a standard model. The standard model was digitized by an extraoral scanner (IScan D103i, Imetric). For each kind of impression materials, thirty impressions were taken following the manufactures' instruction in the same conditions. Subsequently, the impressions were randomly divided into three groups, with ten impressions in each group. After the impression taking was completed, the three groups underwent pure water rinse for 1 min (blank control, BC), 2% glutaraldehyde solution immersion disinfection for 30 min (glutaraldehyde, GD), and Cavicide solution spray disinfection for 5 min (Cavicide, CC), respectively. All the impressions were digitized by the extraoral scanner (IScan D103i, Imetric) after disinfection and exported to a dedicated three-dimensional analysis software (Geomagic Qualify 2014, Geomagic, USA). In the software, the digital models of the impressions were trimmed to teeth and then superimposed with the digitized standard model via best-fit alignment. Root mean square (RMS) was used to evaluate the deviations between the impression and the standard model. The deviation in the anterior and posterior regions was evaluated respectively. One-way ANOVA test and the LSD post-hoc test were used to compare the deviations between the three groups (P < 0.05). The color map of each superimposition was saved for visual analysis. RESULTS: For the polyether and vinylpolysiloxane materials, the difference between the three groups was not statistically significant (P=0.933, P=0.827). For the alginate material, the difference in posterior region between group GD and group BC, as well as group GD and group CC were statistically significant (GD vs. BC, P=0.001; GD vs. CC, P=0.002), while the difference between group BC and group CC was not statistically significant (P=0.854). The visual analysis showed an obvious deviation in the buccal-lingual direction in group GD. CONCLUSION Disinfectant (Cavicide) with benzethon chloramine and isopropanol as main active ingredients using spray disinfection has no effect on the accuracy of the alginate, polyether and vinylpolysiloxane impressions.
2-Propanol ; Chloramines ; Dental Impression Materials ; Dental Impression Technique ; Disinfectants ; Disinfection ; Models, Dental

Adult ; Altitude ; Asian Continental Ancestry Group ; genetics ; Female ; Humans ; Janus Kinase 2 ; genetics ; Male ; Middle Aged ; Mutation ; Polycythemia ; diagnosis ; ethnology ; genetics

Dental Implantation, Endosseous ; methods ; Dental Implants ; Dental Restoration Failure ; Denture, Complete, Immediate ; Humans ; Jaw, Edentulous ; surgery

Objective:To evaluate the bone alteration subject to remodeling and analyze the esthetic result following immediate implant placement of incisors.Methods:In this study,20 patients (1 3 women,7 men)were involved,who needed implants for incisors of maxilla.The patients received 23 im-mediate implants totally.On the day of surgery and 6 months after the implants were placed,Cone beam CT (CBCT)was taken.The thickness of the alveolar ridge and the vertical change of marginal bone levels onthe mesial and distal aspects of theimplants were measured using the computer software (Planme-caRomexis Viewer 3.6.0.R).The evaluation of esthetic result by labial convexity score (LCS)and pa-pilla index score (PIS)were analyzed pre-operation and one year after the final crown was delivered.The statistics with paired-t test for the measurement data and Willcoxon test for rating data were done by SPSS 20.0.Results:The survival rate in the two-year follow-up was 1 00%.The measuring point 1 (MP1 ), MP2,MP3 and MP4 (0,2,4,6 mm apical to the implant platform,respectively)got significant altera-tions after 6 months of the follow-up.These differences were statistically significant (P<0.05 ).The major alteration happened at MP1 and MP4,which got (-0.89 ±2.06)mm and (-0.75 ±1 .28)mm reduction of the alveolar,respectively.The marginal alveolar ridge resorption was (-0.42 ±1 .24)mm and(-0.91 ±1 .96)mm for Ankylos System and Replace System,respectively,and the difference was not statistical significant .The esthetic results were quite acceptable.Before treatment,1 8 incisors rated 3 for LCS,and 2 incisors rated 4 for LCS;after final restoration,only 5 incisors rated 3 for LCS,and 1 4 incisors rated 2 for LCS.Before treatment,1 5 incisors rated 3 for PIS;after final restoration,1 3 incisors rated 3 for PIS.There was no statistically significant difference for the PIS pre-operation and 1 year after final restoration,while there was statistically significant negative change for LCS.Conclusion:Even fol-lowing the proper surgical technique,the alveolar ridge wall still can’t be maintained after immediate im-plant placed in fresh socket of incisors.The inter-dental papilla could be well maintained,while due to the remodeling of labial bone,labial convexity will inevitably collapse.Therefore immediate implant still has esthetic risk.

Biomedical Research ; trends ; Dental Implants ; Esthetics, Dental ; Humans ; Immediate Dental Implant Loading

In China,there are no standard and good modes for the chemistry courses taught in English for the international medical students.On the basis of the experience achieved in teaching the chemistry courses for overseas students,with the intenti on of the science development,the system of chemistry courses with Chinese characteristic has been programmed.

Transforming technology for semi-synthesized isocorydione from the natural product ofisocorydine was studied. The factors affecting on the reaction yield were investigated. UV spectrophotometry was used to indicate the semi-synthesized yield of isocorydione. The optimum reaction conditions were determined as following: reacting for 12 h in the solution of sodium dihydrogen phosphate at pH 10, the temperature was 25 degrees C and the ratio of isocorydine to Fremy's radical was 1 : 2. Under the optimum conditions, the yield could reach up to 50.0%. The molecular structure of isocorydione was elucidated by X-ray single-crystal diffraction analysis for the first time.

Objective:To evaluate the influence of the implant-supported porcelain bridges made from non-precious metals using spark erosion techniques, and to discuss the feasibility and details of making the implant restoration by spark erosion technique.Methods: The study included 12 patients ( 9 males and 3 females) with 92 units implant-supported non-precious porcelain bridge from Sep.2011 to Feb. 2013.All the patients received implant treatment in Department of Oral Implantology, Peking University School and Hospital of Stomatology.The total of 52 implants, were from Nobel Biocare implant system, Camlog implant system and Ankylos implant system.The implant analogs were connected in sequence with a copper wire to guarantee conductivity.The implant electrodes represented one electrode and the superstructure the other.During spark-erosion machining, the cast holding the implant electrodes and the prosthetic framework were moved toward one another, causing an electrical erosion of the protruding ele-ments.Results:After the spark-erosion machining, the minimum gap between the framework and abut-ment was 0.21 mm, which was two units bridge.The maximum was 2.59 mm, which was 11 units bridge with 6 implants.The average gap was 0.68 mm.After the spark-erosion machining, the bridge fitted well with the passive position stability.Conclusion: The method of making implant-supported non-precious porcelain bridge reduces costs on patients.Spark erosion has the potential to provide implant framework with an excellent fit.The patients are satisfied with the clinical results.

Objective To evaluate the feasibility and safety of thoracoscopic radical resection of non-small cell lung cancer(NSCLC)patients under laryngeal mask anesthesia. Methods A total of 40 patients with NSCLC from March to August 2016 in NanFang Hospital of Southern Medical University were recruited and divided into two groups,the laryngeal mask anesthesia(n=20)and the intubation anesthesia group(n=20). Patients from two groups were followed up. Post-operativerecovery ,systemic inflammation response and quality of life were assessed. Results There was no significant difference between the laryngeal mask anesthesia and the intubation anesthesia group in the operation time ,the lowest oxygen saturation ,the maximum end-tidal carbon dioxide partial pressure and the surgical field and the satisfaction of anesthesia and blood loss. Post-operative time to eat ,postoperative use of antibiotics , postoperative hospital stay and drainage time were much shorter in the laryngeal mask anesthesia group ,which also had lowerlevel of white blood cells ,neutrophils and C-reactive protein. Patients with NSCLC undergoing laryngeal mask anesthesia had much higher scores in the quality of life evaluation. Conclusion Thoracoscopic radical resectionunder laryngeal mask anesthesia is safe and feasible for NSCLC patients. It has advantages in reducing the systemic inflammatory response ,accelerating the recovery rate and improving postoperative life quality.

Objective To study the influence of breast-feeding on the common neonatal comorbidities of very low birth weight (ELBW) infants.Method A retrospective study was conducted in our hospital from July 2014 to September 2015.The ELBW infants with birth weight between 1 000 g and 1 500 g were enrolled into the study.The infants were assigned into three groups according to human milk intake during hospitalization:high-volume breast feeding group (the high-volume group) (human milk equal to or greater than 75％),small-volume breast feeding group (the small-volume group) (human milk less than 75％) and premature formula group (the formula group) (exclusive formula fed during hospitalization).The general status,weight gain,the incidences of gastrointestinal dysfunction,neonatal necrotizing enterocolitis (NEC),late onset sepsis,premature retinopathy (ROP),bronchopulmonary dysplasia (BPD) and periventricular leukomalacia (PVL) during hospitalization were compared between the three groups.Logistic regression analysis was applied.Result A total of 210 cases were included in the study.32 cases in the high-volume group,73 cases in the small-volume group and 105 in the formula group.The incidence of NEC (Bell's stage Ⅱ and Ⅲ) in the high-volume group was significantly lower than the small-volume group and the formula group (6.3％ vs.24.7％,26.7％) (P ＜ 0.05).No statistical differences existed as for the incidences of gastrointestinal dysfunction,sepsis,ROP,BPD,and PVL (P ＞0.05).Logistic regression analysis showed that the odds ratio (OR) of survival without NEC in the highvolume group were 0.183 compared with the formula group and 0.204 compared with the small-volume group;and the 95％ confidence interval were 0.041 ～0.818,0.044 ～ 0.938 respectively.No statistically significant differences existed among the three groups in the growth rate of body weight,the time needed to regain birth weight,the time needed to reach total enteral nutrition and the length of hospital stay (P ＞0.05).Conclusion High-volume breast milk intake can reduce the incidence of NEC (Bell's stage Ⅱ and Ⅲ).Breast-feeding has little adverse effects on common comorbidities of ELBW infants.Enhanced breastfeeding has similar efficacy comparing with formula feeding in the catch-up growth.