Objective:To investigate effects of the modified adhesion retention on the surrounding tissues of dental implant.Methods:182 patients with tooth defects were randomly divided into 2 groups,The patients in control group (n =89) received the traditional retention,in the test group(n =93) received modified adhesion retention.The bone loss at the near and far edges of the implant,alveolar bone height and thickness,the pictorial view of pink esthetic score variables(PES),the modified plaque index(mPLI),the modified sulcus bleeding index (mSBI) and the satisfaction were recorded and compared 1 year after treatment.Results:Compared with control group,the test group showed less bone loss(P＜0.05),more alveolar bone height and thickness(P＜0.05).The satisfaction of the comfort,chewing and language function,retention,esthetics,PES,mPLI and mSBI improved to varying degrees(P＜0.05).Conclusion:The modified adhesion retention is more effective than the traditional retention in stabilizing the bone support of implant and reduce bacterial infection.

Objective To investigate the value of prophylactic irradiation to the lymphatic drainage area in radical three-dimensional conformal radiotherapy (3DCRT) and to evaluate the efficacy and adverse effects of 3DCRT with different clinical target volumes.Methods A retrospective analysis was performed on the records of 219 esophageal cancer patients without distant metastasis who received 3DCRT from January 2005 to December 2010.One hundred and five patients received involved-field irradiation (IFI) with a total dose of 54-66 Gy;114 patients received elective nodal irradiation (ENI) with a total dose of 46-52 Gy; the prescribed dose to the primary lesion was 56-70 Gy.The Kaplan-Meier method was used to calculate local control (LC) and overall survival (OS) rates,and the log-rank test was used for univariate prognostic analysis.Results The 1-,3-,and 5-year sample sizes were 219,172 and 67,respectively.The 1-,3-,and 5-year LC rates for IFI group were 63.0％,39.1％,and 27.2％,respectively,versus 70.5％,53.3％,and 51.7％ for ENI group (x2 =6.22,P =0.013) ;the 1-,3-,and 5-year OS rates for IFI group were 67.6％,24.9％,and 15.0％,respectively,versus 73.7％,45.1％,and 26.0％ for ENI group (x2=5.04,P =0.025).The univariate stratified analysis showed that the LC and OS rates were significantly higher in the ENI group than in the IFI group for patients with middle-or lower-thoracic primary lesion or N0 disease (P=0.007,0.015;P=0.054,0.013).Conclusions For esophageal cancer patients with middle-or lower-thoracic primary lesion or without lymph node metastasis,prophylactic irradiation to the lymphatic drainage area can increase LC and OS rates.

Objective The aim of this study was to evaluate the prognosis of resection followed by chemotherapy compared with chemoradiotherapy for limited-stage small cell lung cancer .Methods The clinical data of 230 limited-stage small cell lung cancer patients with curative treatment between January 2006 and December 2011 were retrospectively analyzed .All patients divided to two group: the resection plus chemotherapy ( S +C ) and chemoradiotherapy ( R +C ) .And the prognostic factors were further analyzed with limited stage small cell lung cancer .The Kaplan-Meier method was used for the survival analysis.Results The overall survival rates of 1-year, 3-year and 5-year were 87.0%, 38.9%, 25.4%, respectively and the media survival time ( MST) 26.0 months.When patients were stratified by clinical stageⅠ+Ⅱ, the 1-year , 3-year and 5-year overall survival rates of S +C group and R +C group were 92.6%, 63.2%, 47.3%and 76.2%, 42.9%, 30.6%, respectively (χ2 =7.851, P<0.05), while those were 88.5%, 26.9%, 10.6% and 86.0%, 25.1%, 25.1%, respectively in stage ⅢA with no significant difference ( P >0.05).In univariate analysis, tumor location, tumor stage, lymph node metastasis, TNM stage, the cycle of chemotherapy , treatment modalities were significantly associated with survival ( RR=1.735, P<0.05).The multivariate analysis only showed TNM stage were independent factors of prognosis .Conclusions The results suggested that resection plus chemotherapy could improve the prognosis of early-stage(stageⅠ+Ⅱ) small cell lung cancer, but patients in ⅢA stage should received the definitive chemoradiotherapy .The TNM stage was still the independent factor of prognosis .

Objective To compare the efficacy of elective nodal prophylactic irradiation ( ENI) and involved?field irradiation ( IFI) in radical radiotherapy for early?stage esophageal cancer and to determine the appropriate irradiation range for early?stage esophageal cancer. Methods The clinical data of 121 patients with early?stage esophageal cancer receiving radical radiotherapy in our hospital from January 2006 to December 2011 were collected and respectively analyzed. Sixty?one patients received ENI, and the other 60 patients received IFI. The Kaplan?Meier method was used to calculate local control ( LC) and overall survival ( OS) rates;the log?rank test was used for survival difference analysis and univariate prognostic analysis;the Cox regression model was used for multivariate prognostic analysis. Results The 1?, 3?, and 5?year LC rates in ENI group and IFI group were 81. 1%, 60. 1%, and 57. 5% vs. 64. 5%, 43. 9%, and 27. 2%, respectively ( P=0. 003 ) . The 1?, 3?, and 5?year OS rates in ENI group and IFI group were 86. 9%, 56. 8%, and 34. 8% vs. 86. 7%, 34. 3%, and 19. 1%, respectively ( P=0. 019) . The 1?, 3?,and 5?year overall failure rates in ENI group and IFI group were 22. 3%, 53. 8%, and 63. 2% vs. 43. 3%, 65. 8%, and 78. 8%, respectively ( P=0. 023) . Multivariate analysis showed that irradiation range was the influencing factor for LC and OS. Conclusions As for the radical radiotherapy for early?stage esophageal cancer, ENI can significantly increase LC and reduce locoregional failure, and therefore improve long?term OS.

Objective To compare the prognosis of patients with squamous cell carcinona of the upper thoracic esophagus after radical resection with and without postoperative chemoradiotherapy (POCRT).Methods From January 2007 to December 2011,168 patients with upper thoracic esophageal carcinoma who were treated in the Fourth Hospital of Hebei Medical University were retrospectively included in this study.According to the different treatment method,they were divided into simple surgery group (86 cases) and POCRT group (82 cases) respectively.Based on SPSS statistical software,the group data composition,prognostic analysis and multivariate prognostic analysis were performed by x2 test,Log-rank method and Cox regression model,respectively.Results The 1,3,5 year-survival rate,recurrence rate and distant metastasis rate were 83.9％,52.4％,43.5％,26.5％,40.8％,43.4％ and 5.3％,11.4％,16.9％,respectively.The result of multivariate analysis showed that gender,T stage,N stage and treatment method were independent prognostic factors of overall survival (P =0.020,0.008,0.005,0.000);N staging and treatment method were the independent prognostic factors of local/regional recurrence (P =0.001,0.003);differentiation and T staging were the independent prognostic factors of distant metastasis (P =0.045,0.020).The intrathoracic regional recurrence rate of operation only group and POCRT group patients were 44.2％ (38/86) and 29.3％ (24/82) respectively,where the difference was statistically significant (x2 =7.110,P ＜ 0.05).The rate of metastasis were 19.8％ (17/86) and 13.4％ (11/82) respectively without significant difference (P ＞0.05).Conclusions The recurrence rate of patients with upper thoracic esophageal squamous cell carcinoma after radical resection was still high.Postoperative chemoradiotherapy can improve the overall survival rate and reduce the recurrence rate,but whether it can reduce the patient's distant metastasis rate needs further study.

Objective To analyze the risk factors for abdominal lymph node recurrence after radical surgery in patients with middle thoracic esophageal squamous cell carcinoma (TE-SCC),and to design the target volume for postoperative radiotherapy based on the results.Methods A retrospective study was performed among 913 patients with middle TE-SCC undergoing radical surgery who were admitted to our hospital from 2007 to 2012.Influencing factors were analyzed for abdominal lymph node recurrence after treatment.The efficacy was compared between different treatment methods in the high-risk population.Comparison of categorical data was made by chi-square test.The overall survival rates (OS) were calculated by the Kaplan-Meier method and analyzed by the univariate log-rank analysis.The influencing factors for abdominal lymph node recurrence were analyzed by the multivariate logistic regression equation.Results After treatment,37 patients had abdominal lymph node recurrence,yielding a recurrence rate of 4.1％.A total of 53 recurrent sites were found.The univariate analysis showed that no/low differentiation,pT3+4 stage,no less than 3 positive postoperative lymph nodes,and positive postoperative abdominal lymph nodes were influencing factors for abdominal lymph node recurrence (P =0.032,0.001,0.009,0.000).The multivariate regression analysis showed that pathological T staging and positive postoperative abdominal lymph nodes were influencing factors for abdominal lymph node recurrence (P=0.011,0.000).For patients with pT3+4 stage disease and positive postoperative abdominal lymph nodes,postoperative radiotherapy improved OS and local control rates but failed to reduce the distant metastasis-free rate.Conclusions T staging and positive postoperative abdominal lymph nodes are important risk factors for abdominal lymph node recurrence after radical surgery in patients with middle TE-SCC.Postoperative adjuvant therapy is recommended for patients with pT3+4 stage disease and positive postoperative abdominal lymph nodes.

Objective To compare the efficacy between different modalities in the treatment of positive lymph nodes after radical resection for squamous cell carcinoma of thoracic esophagus(TESCC),and to explore the best treatment mode. The Kaplan?Meier method was used to calculate survival rates. The log-rank test and Cox model were used for univariate and multivariate prognostic analyses,respectively. Methods A retrospective analysis was performed among 548 patients with TESCC who were admitted to our hospital and had positive lymph nodes after radical resection. The efficacy of different treatment methods was evaluated. Propensity scores(PSM)were used to make 1-to-1 patient matching between different treatment groups to further analyze and figure out the best treatment model for patients. The Kaplan?Meier method was used to calculate the overall survival(OS)and disease-free survival(DFS)rates. The log-rank test was used for survival analysis and univariate prognostic analysis. The Cox regression model was used for multivariate prognostic analysis. Results In all patients,the 1-,3-,and 5-year OS rates were 79.9%, 38.1% and 28.5%,respectively,while the 1-,3-,and 5-year DFS rates were 68.5%,39.8% and 32.5%, respectively. After 1-to-1 matching based on PSM,there were no differences in general clinical pathological data between the four groups. After PSM,there were significant differences in 1-,3-,and 5-year OS and DFS rates between the surgery alone group,the postoperative radiotherapy group,the postoperative chemotherapy group,and the postoperative chemoradiotherapy(POCRT)group(P=0.000,0.000).There were significant differences in OS and DFS rates between patients with stage N1,N2,and N3disease(P=0.000,0.000).The result of the Cox multivariate analysis showed that treatment method and N staging were two independent prognostic factors for OS and DFS(P=0.001,0.000,0.025,0.016). Conclusions Patients with positive lymph nodes after radical resection for TESCC have a poor prognosis. Moreover,the prognosis becomes worse with the increase in metastatic lymph nodes. POCRT may improve the survival in those patients. Prospective studies are needed to further confirm those conclusions.

Objective:To evaluate the recurrence patterns of esophageal squamous cell carcinoma (ESCC) after radical surgery and analyze the predictors of post-recurrence survival (PRS).Methods:A total of 382 ESCC patients who developed recurrence after radical surgery were retrospectively reviewed from January 2007 to December 2011. All of them received salvage treatment after recurrence. The Univariate analysis was determined using the Kaplan-Meier method and log-rank test. Multivariate prognostic analysis was determined using the Cox proportional hazard model.Results:The 1-, 3-, 5-year overall survival (OS) rates were 80.9%, 35.6% and 20.4%, respectively. The median survival time and recurrence time were 29.2 months and 15.0 months. The 1-, 3-, 5-year PRS rates were 37.7%, 14.6% and 11.9%, respectively. The median PRS time was 10.2 months. Locoregional recurrence was noted at 462 sites among 382 patients including 20.5% (95/462) of sites in supraclavicular LN (lymph node), 10.0% (46/462) in anastomosis, 56.1% (259/462) in mediastinal regional LN and 13.4% (62/462) in upper abdominal LN. There were 156, 43, 82 and 101 patients treated with salvage radiotherapy, chemotherapy, chemoradiotherapy and palliative care after recurrence, respectively. The univariate analysis showed that T stage, N stage, TNM stage, recurrence site, number of recurrent regions and treatment regimen after recurrence were significantly correlated with PRS ( χ2=5.336, 4.292, 8.067, 7.482, 4.093, 76.426, P<0.05). Patients receiving salvage radiotherapy with the median dose of 60 Gy, were divided into <60 Gy group and ≥ 60 Gy group. The ≥60 Gy group had a better PRS than <60 Gy group ( χ2=8.320, P<0.05). Multivariate analysis showed that number of recurrent regions and treatment regimen were independent prognostic factors of PRS. Conclusions:Mediastinal and supraclavicular regions were the most common sites of recurrence in ESCC patients after radical surgery. Salvage radiotherapy and chemoradiotherapy could significantly improve PRS in recurrent ESCC patients.

Objective: To study the relationship between the dose-volume indexes and acute toxicity of intrathoracic stomach in esophageal cancer patients receiving radiotherapy after esophagectomy. Methods: A total of 104 patients treated with postoperative radiotherapy followed by radical esophagectomy were enrolled. The dose-volume indexes of intrathoracic stomach were collected from treatment planning system. The ROC curve and logistic regression were performed to analyze the relationship between acute toxicity of intrathoracic stomach and clinical parameters, dose-volume indexes. Results: A total of 29 patients (27.88 %) suffered from grade 2 or above acute toxicity. The ROC curve analysis showed that the dose-volume indexes including D_max, D_mean, L₅-L₄₅ and V₅-V₅₀were associated with occurrence of grade 2 or above acute toxicity. The univariate analysis showed that location, D_max, D_mean, L₅-L₄₅ and V₅-V₅₀ were significantly correlated with the incidence of grade 2 or above acute toxicity (P<0.05). The multivariate analysis showed that location, L₅ and V₃₅ were independent factors for incidence of grade 2 or above acute toxicity. The ROC curve analysis showed that cut-off values of L₅ and V₃₅ were 14.00 cm and 44.00%, respectively. And the rates of Grade 2 or above acute toxicity were 20.00% for L₅>14.00 cm and 38.64% for L₅≥14.00 cm (χ²=4.473, P<0.05), 14.08% for V₃₅<44.00% and 57.58% for V₃₅≥44.00% (χ²=7.263, P<0.05), respectively. The incidence of grade 2 or above acute toxicity was significantly higher in post-mediastinum stomach group than the other two groups (χ²=12.881, P<0.05). Conclusions Dose-volume index may be indicator to predict acute toxicity of intrathoracic stomach. It is recommended that post-mediastinum stomach should be chosen carefully if esophageal cancer patients require postoperative radiotherapy.