Journal of Craniomaxillofacial Research最新文献

{"title":"The effect of die spacer on retention and fitting of complete cast crowns","authors":"Mohammadreza Hajimahmoudi, Somayyeh Niakan, Hossein Mohebbi, Romina Sarooghi","doi":"10.18502/jcr.v9i1.11082","DOIUrl":"https://doi.org/10.18502/jcr.v9i1.11082","url":null,"abstract":"Purpose: Loss of the bracket-tooth bond is one of the most common complaints of patients during orthodontic treatment. Various factors play a role in preventing the loss of such a strong bond between the bracket and tooth, one of which is the maintenance of proper isolation and prevention of contamination of tooth surface with blood during the surgical exposure of the impacted tooth. In case of bleeding during disimpaction treatment, the use of hemostatic agents might decrease the odds of tooth surface contamination with blood, resulting in a strong bond. This study aimed to evaluate the effect of different hemostatic agents on the bond between the bracket and tooth. \u0000Materials and Methods: 144 standard stainless steel dies were divided into two groups. Each of them includes 72 dies. These groups were divided into 12 equal subgroups as well. In both groups, die spacer was applied to dies in 0, 3, 4, 5, 6 and 7 layers (each layer=5µ). In the first group, crowns were cemented with Zinc Phosphate and in the second group, Polycarboxylate was used for cementing. After that, the strength required for separating the castings from the dies was measured. \u0000Results: The difference among 12 subgroups analyzed by one-way ANOVA regarding Polycar- boxylate cement did not reach statistical significance. (P=0.95). A similar result was obtained with zinc phosphate cement (P=0.616). Likewise, the two-way ANOVA was carried out between the zinc phosphate and polycarboxylate groups. There was a significant difference between the average of two groups (P<0.001). \u0000Conclusion: Range of cement layer thickness that used in this study didn’t statistically significantly affect the force required to remove cemented cast copings. Although the castings cemented with Zinc Phosphate needed higher force to be dislodged from dies. \u0000 ","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43447481","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}

{"title":"Evaluation the histopathological findings of oral lesions in patients referred to the pathology department of Semnan city (Iran)","authors":"M. Mirmohammadkhani, Marjan Tofighian, Kamyar Mansori, O. Mirmohammadkhani","doi":"10.18502/jcr.v9i1.11080","DOIUrl":"https://doi.org/10.18502/jcr.v9i1.11080","url":null,"abstract":"Background: The aim of this study was to evaluate the histopathological findings of oral lesions in patients referred to the pathology department of Kosar Hospital of Semnan city (Iran) in 2012-2018. \u0000Materials and Methods: This population-based cross-sectional study was concocted on the histopathological findings of oral lesions 137 patients referred to the pathology department of Kosar Hospital of Semnan city (Iran) in 2012-2018. The sampling method was census. The data collection tool was a check including demographics and dentistry (type of dental lesion, location of the lesion, malignancy of lesions, origin of dental lesions, side of the lesion conflict, jaw involved, anterior-posterior position and type of biopsy). SPSS24 was used for data analysis and a signifi- cance level of less than 0.05 was considered. \u0000Results: The most common type and the most common location of oral lesions were periapical cyst (16.7%) and periapical (28.3%); respectively. The most common sources of oral lesions were related to inflammation and connective tissue with 27.5 and 26.8%, respectively. Mandible (47.8%) was the most common involved jaw and 5.1% of reported lesions were malignant. In addition, the prevalence of periapical cyst (78.3 vs. 21.7%) and pyogenic granuloma (82.4 vs. 17.6%) were significantly higher in women than men (P-Value=0.035).The highest rates of periapical cyst (43.5%) and pyogenic granuloma (58.5%) were observed in the age group ≤30 and 31-40 years; respectively (P-Value=0.013). \u0000Conclusion: This study suggests that the female patients and over 40 years should be more careful to check for periapical cyst. However, more detailed studies with higher sample sizes are recommended.","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45801941","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}

{"title":"Evaluation the effect of maxillary protraction on the airway dimensions: a review","authors":"Seyyed Amirhossein Mirhashemi, Hannaneh Ghadirian, R. Bahrami","doi":"10.18502/jcr.v8i4.11070","DOIUrl":"https://doi.org/10.18502/jcr.v8i4.11070","url":null,"abstract":"Aim and Objective:  The aim of this study was to evaluate the effect of maxillary protraction on airway dimensions in growing patients. \u0000Method and material: The research was conducted using literature reviews. Articles included in databases such as PubMed, Embase, Google Scholar and Cochrane were reviewed via inputting keywords such as maxillary protraction, maxilla retrusion, retrognathic, class III malocclusion, face mask, reverse head gear, Delaire, protraction head gear, reverse occlusion, anterior crossbite, growing patient, bone anchorage, dental anchorage. The search period for articles ranged from January 2005 to April 2021. \u0000Results:7 articles with inclusion criteria were included in the study; the results of the studies showed the effectiveness of maxillary protraction on increasing the dimensions of the airway. Studies have shown a significant increase in the size of the upper airway, especially the nasopharynx, following maxillary protraction with tooth-borne and bone-borne appliances. \u0000Conclusion: Maxillary protraction can increase the size of the upper airway in growing patients. However, further studies are needed to elucidate the effects on changes in the pharyngeal airway, respiratory indicators (such as the apnea-hypopnea index), and its long-term effects.","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43311613","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}

{"title":"Molar impaction patterns and skeletal malocclusions","authors":"Arian Hesam Arefi, Seyed Morteza Samimi, R. Ghorbani","doi":"10.18502/jcr.v8i4.11072","DOIUrl":"https://doi.org/10.18502/jcr.v8i4.11072","url":null,"abstract":"Objectives: Impacted teeth fail to erupt fully into the oral cavity within the expected time due to interferences with the jaw bone, adjacent tooth, or even the gingivae. The third molar impaction frequency is related to space deficiency in dental arches. This study investigated different patterns of third molar impaction in various skeletal malocclusions in anteroposterior and vertical dimensions. \u0000Materials and methods: In this study, 362 panoramic and lateral cephalograms of the patients with orthodontic treatment indications were verified and investigated. The malocclusion type was determined and diagnosed using lateral cephalogram tracing. \u0000Results: 39.2% of the patients were male, and 60.8% were female. The mean age of all the patients was 19.2 years; 35.6% of patients exhibited deep bite, and 32% had class II malocclusion. 44.5% of patients had two impacted third molars, and 23.5%, 20.7%, and 11.3% had four, one, and three impacted third molars, respectively. The frequencies of the mesio-angular pattern were 80.8% and 83.5% in the left and right quadrants of the mandible, respectively. The disto-angular pattern frequencies in the left and right quadrants of the maxilla were 91.1% and 93.3%, respectively. \u0000Conclusion: The current study revealed that the highest incidence of third molar impaction was in the deep bite and class II malocclusions. The most common pattern of impaction was mesio-angular and disto-angular in the mandible and maxilla, respectively. Statistical analysis showed no significant relationship between the numbers and patterns of third molar impaction and skeletal malocclusion types. \u0000 ","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43490613","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}

{"title":"Clinicopathological Presentation of Oral Squamous Cell Carcinoma in Iraqi population","authors":"Dr. Bayad Jaza Mahmood, I. Gataa, Umed Muhammad Mustafa","doi":"10.18502/jcr.v8i3.8839","DOIUrl":"https://doi.org/10.18502/jcr.v8i3.8839","url":null,"abstract":"Background and Aim: Oral cancer is a major public health issue worldwide; it remains a highly lethal and disfiguring disease, it is primarily a disease of epithelial origin, it has various clinicopathological pictures. is to demonstrate various clinical and pathological presentations of oral squamous cell carcinoma in Iraqi population. \u0000Materials and Methods: A total of 80 cases of histologically diagnosed squamous cell carcinoma collected from the main centers of Sulaymaniyah teaching hospital/Hiwa cancer center Hospital/Sulaymaniyah/Iraq were analyzed according to age, sex, site, clinical, and pathological presentation of oral squamous cell carcinoma at the time of presentation, and histological grading. \u0000Results: Patients in their sixth decade of life were the most commonly affected with a male-to-female ratio of 1.4:1. The tongue was the most frequently affected site, followed by the floor of the mouth. The most common clinical presentation is ulceration and swelling. More than 40% of the cases were well-differentiated squamous cell carcinoma. \u0000Conclusion: Oral cancer is increasingly seen as a major health problem, in line with the general trend in the region, the need for inter-professional health care delivery approaches for reducing oral cancer mortality and improving patients’ quality of life.","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42487190","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}

{"title":"On recommended mouthwashes during COVID-19 pandemic: A review","authors":"Seyyed Amirhossein Mirhashemi, R. Bahrami","doi":"10.18502/jcr.v8i3.8836","DOIUrl":"https://doi.org/10.18502/jcr.v8i3.8836","url":null,"abstract":"Aim and Objective: One of the challenges we are currently facing is the COVID-19 pandemic. With its rapid spread around the world, it has become an unprecedented major health, human, and financial crisis. The saliva of COVID-19 patients contains the virus that can be transmitted. Various studies have shown the effect of mouthwashes in reducing the rate of transmission of the virus and, consequently, reducing the likelihood of infection. Therefore, we considered it important to examine the effect of using different mouthwashes by studying the existing data and articles. \u0000Materials and Methods: The study was conducted by the review method. The keywords“coronavirus, SARS-CoV-2, COVID-19, mouthwash, hydrogen Peroxide, chlorhexidine, povidone-iodine, cetylpyridinium chloride” were searched in articles and protocols in the following databases: PubMed, Scopus, Embase, Dimensions. The searched articles were submitted from January 2019 to April 2021. Only the articles in English were studied. \u0000Results: Among 23 reviewed studies, there were 15 review study, 4 in vitro study, two clinical trial, one letter to the editor in chief, and two studies that are, in fact, instructions of Australian and American dental community. 4 studies were published in 2021, 18 articles in 2020, and 1 article in 2019. By investigating 16 reports, Povidone-Iodine mouth wash was the most effective mouthwash ever mentioned. Hydrogen peroxide mouth rinse with nine mentions, chlorohexidine with seven mentions, cetylpyridinium chloride with four mentions, Essential oils with three mentions, and mouth rinses contains Citrox and beta-cyclodextrin, and Methylene blue with one mention was ranked next. Generally, most of the studies have recommended mouth rinses use in patients in dental clinics (or other recipients of health care services). They have emphasized their effectiveness in reducing the viral load in saliva and oral secretions. \u0000Conclusion: The results of the review showed that povidone-iodine mouthwash and hydrogen peroxide mouthwash can be the first and the second candidates to reduce viral load and, consequently, reduce disease transmission. However, more clinical studies are needed to confirm the results.","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42078149","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}

{"title":"Maxillary odontogenic myxoma: A case report","authors":"M. Barzegar, H. Ajami, A. Pouyafard, Gooya Kabir","doi":"10.18502/jcr.v8i3.8842","DOIUrl":"https://doi.org/10.18502/jcr.v8i3.8842","url":null,"abstract":"\u0000 \u0000 \u0000Odontogenic myxoma is a benign mesenchymal tumor that appears to be associated with odon- togenic ectomesenchyme of the growing teeth. This tumor, which often occurs in the second and third decades of life, is extremely rare and often asymptomatic in children. However, no theoretical consensus exists in the literature over the diagnosis and treatment of this disease. In this study, we investigated the diagnostic and therapeutic methods of a rare case of odontogenic myxoma in a 13-year-old child. \u0000 \u0000 \u0000","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48963051","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}

{"title":"Pattern of impacted teeth among patients at MNH","authors":"Kanankira Anandumi, B. Kalyanyama, J. Moshy, K. Sohal, E. Simon","doi":"10.18502/jcr.v8i3.8841","DOIUrl":"https://doi.org/10.18502/jcr.v8i3.8841","url":null,"abstract":"\u0000 \u0000 \u0000Introduction: An impacted tooth is the one which fails to attain its normal functional position within the expected developmental period. They are associated with various pathologies. Hence, the aim of this study was to determine the pattern of occurrence, presentation, and management of impacted teeth among patients attending Muhimbili National Hospital. \u0000 \u0000 \u0000 \u0000Materials and Methods: This was a cross-sectional hospital-based study that included all patients aged≥21 years and had impacted teeth. The patients were interviewed using a specially designed questionnaire and later examined clinically and radiographically. Data obtained was an- alyzed using SPSS version 23.0. \u0000 \u0000 \u0000 \u0000Results: A total of 4,668 patients comprising of 1938 (41.5%) males and 2730 (58.5%) females were attended. Among these, 264 (5.6%) patients comprising of 152 (57.6%) males and 112 (42.4%) females had impacted teeth. The 21-25 years age group was the most (59.2%) commonly affected. Mandibular third molars were the most (64.9%) impacted teeth followed by 167 (33.4%) maxillary third molars. Pain was the most common complaint in 79.1% of patients. Mesio-angular impaction was the most common angulation in 196 (39.9%) impacted teeth, followed by vertical impaction in 142 (28.7%) and disto-angular 103 (21.0%) impacted teeth. A majority (66.6%) of impacted teeth were treated by open surgical removal followed by 53 (10.5%) impactions by closed disimpaction. \u0000 \u0000 \u0000 \u0000Conclusion: The occurrence of impacted teeth among the patients attended at MNH was 5.6%. Mandibular third molars were the most commonly impacted teeth with mesio-angular being the commonest type of angulation of impacted teeth. Pericoronitis was the most common pathology associated with impacted teeth, others included dental caries, ameloblastoma, and dentigerous cysts. Surgical disimpaction was the most frequently used treatment method with good healing results. \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46252702","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}

{"title":"Hemostatic Agents in Orthodontics: a review","authors":"Majid Samaei Rahni, Arian Hesam Arefi","doi":"10.18502/jcr.v8i3.8835","DOIUrl":"https://doi.org/10.18502/jcr.v8i3.8835","url":null,"abstract":"Introduction and aims: Loss of the bracket‒tooth bond is one of the most common complaints of patients during orthodontic treatment. Various factors play a role in preventing the loss of such a strong bond between the bracket and tooth, one of which is the maintenance of proper isolation and prevention of contamination of tooth surface with blood during the surgical exposure of the impacted tooth. In case of bleeding during disimpaction treatment, the use of hemostatic agents might decrease the odds of tooth surface contamination with blood, resulting in a strong bond. This study aimed to evaluate the effect of different hemostatic agents on the bond between the bracket and tooth. \u0000Materials and methods: Science Direct, PubMed, and Google Scholar databases were searched for relevant previous studies published from 2010 to 2020. These studies’ titles and abstracts were evaluated for inclusion criteria. In vivo and in vitro studies evaluating the effect of hemostatic agents on the bracket‒tooth bond were included. \u0000Results: Eight studies were included in the study based on inclusion criteria; five studies were in vitro, and two were in vivo; one study had both designs. Of in vitro studies evaluating the bond strength, five studies reported a higher bond strength in the control group than the group in which the tooth surfaces were contaminated with a hemostatic agent; besides, the bond strength in the hemostatic agent group was higher than that in the group in which the tooth surfaces were contaminated with blood. Of in vivo studies, two studies evaluated bracket failure as a criterion to evaluate bonding quality. In one of these studies, bracket failure in the control groups was more than the hemostatic agent group, and in the other study, it was more prevalent in the hemostatic agent group than the control groups. Studies comparing different hemostatic agents did not report any significant differences in bonding quality. \u0000Conclusion: It appears that the use of hemostatic agents in disimpaction treatments can prevent contamination of tooth surface with blood, increasing the bond strength between the bracket and tooth; however, care should be exercised to prevent tooth surface contamination with hemostatic agents.","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49305183","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}

{"title":"Evaluation of the knowledge, attitude, and practice of patients visiting Zanjan dental school about oral and dental hygiene in 2021","authors":"Erfan Mahdavi, M. Mirkeshavarz, Kamyar Mansori","doi":"10.18502/jcr.v8i3.8840","DOIUrl":"https://doi.org/10.18502/jcr.v8i3.8840","url":null,"abstract":"\u0000 \u0000 \u0000Introduction: Oral health is one of the most important components of health and has a great impact on the quality of life. One of the strategies to promote oral health is to increase knowledge, attitude, and practice among people in the community. The aim of this study was to evaluate the level of knowledge, attitude, and practice of oral health in patients referred to Zanjan Dental School. \u0000 \u0000 \u0000 \u0000Materials and Methods: This cross-sectional study was performed on 196 patients referred to Zanjan Dental School and their knowledge, attitude, and practice regarding oral health were assessed using a valid and reliable questionnaire. After the necessary time to answer the questions, the questionnaires were collected and the obtained data were entered into the statistical software SPSS version 22. T-test, ANOVA, and Pearson correlation were used to determine the effect of gender, level of education, and age on patients’ knowledge, attitude and practice, respectively. Sig- nificance level was also considered 0.05. \u0000 \u0000 \u0000 \u0000Results: The mean age of patients was 32.52±12.81 years and 97 patients (49.5%) were male. The mean and standard deviation of the knowledge score was 3.27±1.31 (moderate). This rate was 19.23±2.63 for attitude (good) and 3.25±1.38 (moderate) for performance. Patients’ knowledge and practice were significantly higher in females (P=0.020 and P=0.009, respectively). Also, patients with university education provided higher knowledge, attitudes, and practice (P<0.001). Patients’ age also had a significant but inverse relationship with knowledge, attitude, and practice (P<0.001). \u0000 \u0000 \u0000 \u0000Conclusion: The knowledge and practice of patients referred to Zanjan Dental School was moderate; although their attitude was at a good level. In order to increase patients’ knowledge and practice, there is a need to provide solutions such as educational programs to different parts of society. \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000","PeriodicalId":52622,"journal":{"name":"Journal of Craniomaxillofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46159526","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}