PURPOSE The aim of this clinical study was to evaluate the changes of alveolar bone morphology before and after upper incisors retraction with mini implant anchorage using cone-beam CT (CBCT). METHODS Twenty-two young patients with dentoalveolar maxillary protrusion and extraction of 2 maxillary first premolars were evaluated with CBCT. CBCT scans were obtained before treatment and 3 months after retraction of the incisors. The movement patterns of the upper incisors were assessed with Mimics15.0. The labial and palatal alveolar plates at crest level, midroot level, and apical level for bone-thickness changes and labial and palatal vertical bone level during retraction of the maxillary anterior segments were assessed with Invivo5.0. Paired t tests were used to evaluate the changes. RESULTS The edge of the maxillary incisor and the root apex appeared lingual movement horizontally, but the moving distance was larger than the root apex. The edge of the incisors was moved downward, and the root apex was moved upward obviously. The palatal thickness and total thickness of the alveolar bone showed significant decrease at the crest level and midroot level after retraction while the apical level showed significant increase(P＜0.05). The palatal vertical bone level also showed great loss (P＜0.05). CONCLUSIONS After extensive retraction of the maxillary incisors, tilt movements are controlled with high traction hooks and microscrew implants. The decreases in palatal bone thickness are much more significant compared with the increases in labial bone thickness. Alveolar bone remodeling doesn't follow the movement of tooth, suggesting that the limitation of anterior teeth retraction should be taken into consideration.
{"title":"[Evaluation of the changes of alveolar bone around the upper incisors after retraction with mini implant anchorage using cone-beam CT].","authors":"Chenghong Xiang, Zhang Xiang-feng, Huang Qian-qian, Zhang Yi, Yu Feng, W. Hua-qiao","doi":"10.19439/J.SJOS.2018.02.008","DOIUrl":"https://doi.org/10.19439/J.SJOS.2018.02.008","url":null,"abstract":"PURPOSE The aim of this clinical study was to evaluate the changes of alveolar bone morphology before and after upper incisors retraction with mini implant anchorage using cone-beam CT (CBCT). METHODS Twenty-two young patients with dentoalveolar maxillary protrusion and extraction of 2 maxillary first premolars were evaluated with CBCT. CBCT scans were obtained before treatment and 3 months after retraction of the incisors. The movement patterns of the upper incisors were assessed with Mimics15.0. The labial and palatal alveolar plates at crest level, midroot level, and apical level for bone-thickness changes and labial and palatal vertical bone level during retraction of the maxillary anterior segments were assessed with Invivo5.0. Paired t tests were used to evaluate the changes. RESULTS The edge of the maxillary incisor and the root apex appeared lingual movement horizontally, but the moving distance was larger than the root apex. The edge of the incisors was moved downward, and the root apex was moved upward obviously. The palatal thickness and total thickness of the alveolar bone showed significant decrease at the crest level and midroot level after retraction while the apical level showed significant increase(P＜0.05). The palatal vertical bone level also showed great loss (P＜0.05). CONCLUSIONS After extensive retraction of the maxillary incisors, tilt movements are controlled with high traction hooks and microscrew implants. The decreases in palatal bone thickness are much more significant compared with the increases in labial bone thickness. Alveolar bone remodeling doesn't follow the movement of tooth, suggesting that the limitation of anterior teeth retraction should be taken into consideration.","PeriodicalId":436266,"journal":{"name":"Chinese Journal of Oral Implantology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128874180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-25DOI: 10.19439/J.SJOS.2018.02.009
Wei Meng-yao, Wang Xiao-li, Li Yan, Gao Ya
PURPOSE To investigate the anatomic morphology of root and root canal system of maxillary premolars by using cone-beam computer tomography (CBCT), in order to provide imaging basis for clinical treatment. METHODS CB CT images of 720 patients (aged from 18 to 67 years) were included. They were divided into 5 groups according to their ages：18-28，29-38，39-48，49-58 and＞58 years old . The number of roots and root canals, root canal configuration, the distance between two orifices,root canal curvature,distance from apex to maxillary sinus,symmetry of the bilateral teeth and its relationship to age changes were analyzed statistically using SPSS21.0 software package. RESULTS Double root canal of the first maxillary premolar accounted the most (89.72%), and type IV was the frequent type (57.78%) . The incidence of single root canal in the second maxillary premolar (53.06%) was slightly higher than double root canal (46.94%). Root canal type was mainly type I (53.06%). There was symmetrical distribution in the bilateral root and root canals of maxillary premolars. The detection rate of the single root canal was changed with age, and the distance between the two orifice was closely related to the root morphology. The detection rate of root curvature in maxillary first and second premolar was 32.53% and 21.50% in buccolingual direction. There was a certain proportion of S-type complex root canal.16.69% of the maxillary second premolar and maxillary sinus were closely related (d≤0.05 mm). CONCLUSIONS The anatomical structure of root and root canal is complicated .The prevalence of the bilateral teeth presents symmetry and age-related changes.The curvature of root canal is complex, and the roots are closely related to maxillary sinus.
{"title":"[Study on root canal variation of maxillary premolar and its relationship to maxillary sinus by cone-beam CT].","authors":"Wei Meng-yao, Wang Xiao-li, Li Yan, Gao Ya","doi":"10.19439/J.SJOS.2018.02.009","DOIUrl":"https://doi.org/10.19439/J.SJOS.2018.02.009","url":null,"abstract":"PURPOSE To investigate the anatomic morphology of root and root canal system of maxillary premolars by using cone-beam computer tomography (CBCT), in order to provide imaging basis for clinical treatment. METHODS CB CT images of 720 patients (aged from 18 to 67 years) were included. They were divided into 5 groups according to their ages：18-28，29-38，39-48，49-58 and＞58 years old . The number of roots and root canals, root canal configuration, the distance between two orifices,root canal curvature,distance from apex to maxillary sinus,symmetry of the bilateral teeth and its relationship to age changes were analyzed statistically using SPSS21.0 software package. RESULTS Double root canal of the first maxillary premolar accounted the most (89.72%), and type IV was the frequent type (57.78%) . The incidence of single root canal in the second maxillary premolar (53.06%) was slightly higher than double root canal (46.94%). Root canal type was mainly type I (53.06%). There was symmetrical distribution in the bilateral root and root canals of maxillary premolars. The detection rate of the single root canal was changed with age, and the distance between the two orifice was closely related to the root morphology. The detection rate of root curvature in maxillary first and second premolar was 32.53% and 21.50% in buccolingual direction. There was a certain proportion of S-type complex root canal.16.69% of the maxillary second premolar and maxillary sinus were closely related (d≤0.05 mm). CONCLUSIONS The anatomical structure of root and root canal is complicated .The prevalence of the bilateral teeth presents symmetry and age-related changes.The curvature of root canal is complex, and the roots are closely related to maxillary sinus.","PeriodicalId":436266,"journal":{"name":"Chinese Journal of Oral Implantology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131349546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-06-25DOI: 10.19439/J.SJOS.2017.03.003
Huang Yu-feng, Jin Wen-zhong
{"title":"Influences of destroyed apical constriction on the accuracy of PropexII electronic apex locator","authors":"Huang Yu-feng, Jin Wen-zhong","doi":"10.19439/J.SJOS.2017.03.003","DOIUrl":"https://doi.org/10.19439/J.SJOS.2017.03.003","url":null,"abstract":"","PeriodicalId":436266,"journal":{"name":"Chinese Journal of Oral Implantology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128735344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-06-01DOI: 10.19439/J.SJOS.2017.03.013
D. Hua, Zhang Shu-yu, Liu Yue-ling
PURPOSE To provide scientific basis for the establishment of oral health care polices in Jiading, and to evaluate the effectiveness of a free dental filling intervention conducted for childen in Jiading district. METHODS Nine hundred and eighteen children of 3-5 year old from two kindergartens with similarities in living environments and economic conditions were enrolled in this study. Children in the intervention group received both oral health examination and free filling of shallow and moderate caries once a year for 3 years, while children in the control group received only oral health examination once a year. The data were analyzed with SPSS 20.0 software package for Chi-square test. RESULTS Total caries prevalence，mean dft and CSI of the two groups had no significant difference in the first year. There was significant difference between the two groups in caries prevalence, mean dft and CSI (which were 43.90%, 2.86 and 7.34, respectively) after 3 years of the interventions. CONCLUSIONS Free dental filling intervention programme is effective in early prevention and control of caries.
{"title":"Effects of free dental filling interventions on early childhood primary tooth caries in Shanghai Jiading district","authors":"D. Hua, Zhang Shu-yu, Liu Yue-ling","doi":"10.19439/J.SJOS.2017.03.013","DOIUrl":"https://doi.org/10.19439/J.SJOS.2017.03.013","url":null,"abstract":"PURPOSE To provide scientific basis for the establishment of oral health care polices in Jiading, and to evaluate the effectiveness of a free dental filling intervention conducted for childen in Jiading district. METHODS Nine hundred and eighteen children of 3-5 year old from two kindergartens with similarities in living environments and economic conditions were enrolled in this study. Children in the intervention group received both oral health examination and free filling of shallow and moderate caries once a year for 3 years, while children in the control group received only oral health examination once a year. The data were analyzed with SPSS 20.0 software package for Chi-square test. RESULTS Total caries prevalence，mean dft and CSI of the two groups had no significant difference in the first year. There was significant difference between the two groups in caries prevalence, mean dft and CSI (which were 43.90%, 2.86 and 7.34, respectively) after 3 years of the interventions. CONCLUSIONS Free dental filling intervention programme is effective in early prevention and control of caries.","PeriodicalId":436266,"journal":{"name":"Chinese Journal of Oral Implantology","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127078999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.19439/J.SJOS.2017.02.009
C. Zhong, Xu Yong, J. Qing
PURPOSE: By using HN4 cells, the correlation among protein kinase C(PKC), P120-catenin(P120ctn) and E-cadherin (E-cad) was investigated, and the role of them in migration and invasion of oral squamous-cell cancer(OSCC) was evaluated. METHODS: Plasmid pGFP-V-RS-P120ctn shRNA was used to transfect HN4 cells to significantly reduce the expression of P120ctn and PKC inhibitor staurosporine (STS) was added. mRNA and protein expression of PKC, P120ctn and E-cad were tested and Transwell cell invasion and cell migration assay was used to test the invasion and migration capacity before and after PKC inhibition. Statistical analysis was performed using SPSS 18.0 software package. RESULTS: When PKC was inhibited by STS, the expression of P120ctn and E-cad in OSCC cells were increased and the migration and invasion capacity of tumor cells decreased significantly (P<0.05). CONCLUSIONS：PKC may be involved in the process of HN4 migration and invasion by regulating cell adhesion through the effect of P120ctn and E-cad.
{"title":"Effect of PKC inhibition on cell migration and invasion of oral squamous cell carcinoma","authors":"C. Zhong, Xu Yong, J. Qing","doi":"10.19439/J.SJOS.2017.02.009","DOIUrl":"https://doi.org/10.19439/J.SJOS.2017.02.009","url":null,"abstract":"PURPOSE: By using HN4 cells, the correlation among protein kinase C(PKC), P120-catenin(P120ctn) and E-cadherin (E-cad) was investigated, and the role of them in migration and invasion of oral squamous-cell cancer(OSCC) was evaluated. METHODS: Plasmid pGFP-V-RS-P120ctn shRNA was used to transfect HN4 cells to significantly reduce the expression of P120ctn and PKC inhibitor staurosporine (STS) was added. mRNA and protein expression of PKC, P120ctn and E-cad were tested and Transwell cell invasion and cell migration assay was used to test the invasion and migration capacity before and after PKC inhibition. Statistical analysis was performed using SPSS 18.0 software package. RESULTS: When PKC was inhibited by STS, the expression of P120ctn and E-cad in OSCC cells were increased and the migration and invasion capacity of tumor cells decreased significantly (P<0.05). CONCLUSIONS：PKC may be involved in the process of HN4 migration and invasion by regulating cell adhesion through the effect of P120ctn and E-cad.","PeriodicalId":436266,"journal":{"name":"Chinese Journal of Oral Implantology","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121718306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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