Investigation on the application of teaching technology of virtual simulation in undergraduate schools of stomatology in China / 口腔疾病防治

Objective@#To investigate the current situation of using virtual simulation technology in undergraduate schools of stomatology in China, analyze the problems and put forward corresponding improvement suggestions. @*Methods@# A questionnaire survey was conducted among 672 teachers and 3 849 students in undergraduate schools of stomatology in China. @*Results @#25.81% of all participants had took part in dental virtual simulation courses, and 37.80% of the participants from “Double First-Class” universities had participated in dental virtual simulation courses. 92.12% of the virtual simulation courses were established for undergraduates. "Traditional course + virtual simulation model demonstration" is the main teaching form of virtual simulation courses. Most of the participants were satisfied with the virtual simulation courses offered by their schools. At present, there are also some deficiencies in the virtual simulation courses, such as lack of teaching resources, insufficient interaction and simulation.@*Conclusion@#There is difference in the application of virtual simulation technology in undergraduate schools of stomatology in China. The virtual simulation technology is more widely used in "Double First-Class" universities than in ordinary universities. Undergraduates are the main teaching objects of virtual simulation courses. Stomatological schools in China should pay attention to the development and utilization of virtual simulation curriculum resources by cooperation, enrich the form of virtual simulation courses and strengthen the promotion and application of virtual simulation technology in stomatological education.

Application of the "quaternity" hybrid digital teaching method in the standardized residency training of clinical pathology / 中华医学教育探索杂志

Based on the limitations of certain conditions in the traditional clinical pathology teaching, this paper puts forward the "quaternity" hybrid digital teaching reform practice of clinical medicine, imaging, anatomy and pathology content. This teaching method can optimize the teaching process and improve the teaching efficiency. The specific advantages of this teaching method are as follows: the digital materials of different modules of clinical practice, imaging, anatomy and pathology are integrated to make the teaching content more perfect; it is helpful to improve the cognition of resident doctors on the pathological characteristics and the overall characteristics of the disease, and promote their thinking ability of clinicopathological integration; the combination of hybrid digital teaching and various teaching methods, including clinical pathology discussion, makes teaching more free and is conducive to classroom learning and self-learning. This paper discussed the construction and application of the "quaternity " hybrid digital teaching mode, and provided new ideas and methods for clinical pathology teaching and talent training.

Feasibility analysis of digital method for measuring supracrestal tissue height crest around implant / 华西口腔医学杂志

OBJECTIVES@#This study aimed to investigate the feasibility of measuring the soft tissue height of bone cristae around implant by digital method.@*METHODS@#A total of 36 patients with dental implants were selected from the Dental Medicine Center of the First Affiliated Hospital of University of Science and Technology of China (Anhui Provincial Hospital) from August 2022 to December 2022. A total of 43 dental implants were enrolled. All postoperative cone beam CT (CBCT) imaging data and intraoral digital impressions obtained before surgery were immediately obtained by the patients on the day of completion of oral implant surgery and they were imported into oral implant surgery planning software for image fitting. Then, virtual implants of the same specification were placed in the planting area, and the implant position was adjusted to overlap with the implant shadow in the CBCT image. Supracrestal tissue height (STH) was measured at the implant view interface (digital group). During the operation, implant holes were prepared step by step in accordance with the standard preparation method, and implants were implanted. The upper edge of the implant was flushed with the crest of the alveolar ridge. STH was measured by perio-dontal probing (periodontal probe group). Paired t-test was used to compare the STH differences between the digital and periodontal probe groups. Bland-Altman test was used to analyze the consistency of the two methods. Intra-group correlation coefficient (ICC) was used to verify the reliability of the results measured by different surveyors using di-gital methods.@*RESULTS@#No statistical significance was observed in the STH difference between the two methods (P>0.05). Bland-Altman test showed good consistency between the two methods, but the measurement of mandibular posterior teeth showed that the results of periodontal probe were greater than those of digital method. The ICC and 95%CI of the STH results measured digitally by different surveyors are 0.992 (0.986-0.996).@*CONCLUSIONS@#The digital me-thod is in good agreement with the periodontal probe method in measuring the soft tissue height of the bone cristae around the implant.

Exploration of Traditional Production Technique of PAEONIAE RADIX : Digitization and Analysis of Processing Environment / 日本東洋医学雑誌

We focused on the traditional processing method which generates the superior quality of Yamato-shakuyaku. First, we assessed the historical literature written around Edo and Meiji period and rediscovered the traditional air drying method still inherited in Nara Prefecture. Then, we gathered and analyzed the data of medicinal plants production in Nara Prefecture among 1938 and 2019, and investigated the decline of local production and experienced agricultural techniques of peony through the transition of its yield. In order to visualize the ancient knowledge of crude drug manufacturers that contributes to the instruction of the skills for supply of seedlings, cultivation, and processing, we settled the meteorological observation devise at the outdoor drying shelf for 3 years, and recorded the real drying environment. When comparing the meteorological data with other cultivating area of peony using the estimated values of Agro-Meteorological Grid Square Data, the climate of Nara Prefecture was with high temperature and low humidity than other areas, and it seems to be quite suitable for air drying with adequate topography. The wind rose calculated by measured values of wind direction and wind speed showed the wind conditions in Nara that west wind was frequent in daytime and wind conditions are mildly but diversely changing. Among other producing areas of peony, the mechanical drying is major, whereas air-drying with low cost utilizing local environment features is still applied in Nara. We revealed the rationality of traditional methodology by digitization of meteorological factors which can be high added value.

Factors influencing the accuracy of intraoral impression in implant restoration / 口腔疾病防治

@#Due to advances in digital technology, intraoral impressions have been increasingly used to fabricate implant restorations because of its simplicity, high efficiency, comfortableness and convenience. In clinical practice, the accuracy of intraoral impressions depends on various factors, including scanner technique, status of dentition and implants, auxiliary devices, materials and environment, which might influence its accuracy and limit its application. When applied to patients missing more teeth, its accuracy may be insufficient. It is suggested that intraoral impressions be used cautiously when there are multiple and far apart implants and that the scan body not be tightened excessively and that maintain appropriate environmental conditions. In this article, we have reviewed recent relevant literature and the factors affecting the accuracy of intraoral impressions for implant restoration.

Economía, Comercio Digital y el Consumo del Ciudadano de Lima Metropolitana / Economy, Digital Commerce and Consumption of the Citizen of Lima Metropolitan / Economia, Comércio Digital e Consumo Do Cidadão De Lima Metropolitana

Resumen Introducción. Se exponen los resultados de la investigación compatibilizando hallazgos y conceptos identificados en la economía. Objetivo. Identificar el contexto en que se desarrolla la economía digital, su avance e impacto en la economía peruana específicamente en la ciudad de Lima, y su relación con el consumo. Materiales y métodos. El enfoque de investigación es cuanticualitativo con un alcance descriptivo. Se aplican dos cuestionarios, estructurado para usuarios y no estructurado para expertos. Resultados. La aplicación de cuestionarios y compatibilización con datos secundarios, exponen la acelerada aplicación de tecnologías de información y comunicación y el fortalecimiento de la economía digital. El comercio electrónico relacionado impulsa el desarrollo de la bancarización de los consumidores. La tendencia de los países hacia la economía digital, requiere modificaciones sociales y normativas para aprovechar la tecnología. Los consumidores de Lima Metropolitana el 58,4 % reconocen su importancia para la sociedad, pero solo el 6,0 % destina más del 50 % del presupuesto en compras en línea. Conclusiones. El desarrollo de la economía digital y el comercio electrónico favorece a la sociedad con menores costos, diversidad de oferta y ahorro de tiempo en desplazamiento físico. Se necesitan políticas que promuevan la inclusión e igualdad de acceso. En los consumidores de Lima Metropolitana existe posibilidad de desarrollo del comercio electrónico y limitaciones.

Abstract Introduction. The results of the research are presented, making the research and concepts identified in the economy compatible. Objective. Identify the context in which the digital economy develops, its progress and impact on the Peruvian economy, specifically in the city of Lima, and its relationship with consumption. Materials and methods. The research approach is quantitative-qualitative with a descriptive scope. Two questionnaires are applied, structured for users and unstructured for experts. Results. The application of questionnaires and compatibility with secondary data expose the accelerated application of information and communication technologies and the strengthening of the digital economy. Related electronic commerce drives the development of consumer banking. The trend of countries towards the digital economy requires social and regulatory changes to test the technology. 58.4 % of consumers in Metropolitan Lima recognize its importance for society, but only 6.0 % allocate more than 50 % of the budget to online purchases. Conclusions. The development of the digital economy and electronic commerce favors society with lower costs, diversity of supply and time savings in physical travel. Policies that promote inclusion and equal access are needed. In the consumers of Metropolitan Lima there is the possibility of developing electronic commerce and limitations.

Resumo Introdução. Os resultados da pesquisa são apresentados, compatibilizando os achados e conceitos identificados na economia. Objetivo. Identificar o contexto em que a economia digital se desenvolve, seu progresso e impacto na economia peruana, especificamente na cidade de Lima, e sua relação com o consumo. Materiais e métodos. A abordagem da pesquisa é quantitativa-qualitativa com escopo descritivo. São aplicados dois questionários, estruturados para usuários e não estruturados para especialistas. Resultados. A aplicação de questionários e a compatibilidade com dados secundários expõem a aplicação acelerada das tecnologias de informação e comunicação e o fortalecimento da economia digital. O comércio eletrônico relacionado impulsiona o desenvolvimento do banco de consumo. A tendência dos países para a economia digital exige mudanças sociais e regulatórias para aproveitar a tecnologia. 58,4% dos consumidores da região metropolitana de Lima reconhecem sua importância para a sociedade, mas apenas 6,0 % destinam mais de 50 % do orçamento para compras online. Conclusões. O desenvolvimento da economia digital e do comércio eletrônico favorece a sociedade com menores custos, diversidade de oferta e economia de tempo nas viagens físicas. São necessárias políticas que promovam a inclusão e a igualdade de acesso. Nos consumidores da região metropolitana de Lima existe a possibilidade de desenvolvimento do comércio eletrônico e limitações.

Comprensión Hermenéutica de una Ontologia del Presente en la Era Digital / Hermeneutic Understanding of an Ontology of the Present in the Digital Age / Compreensão Hermenêutica de uma Ontologia do Presente na Era Digital

Resumen EL presente como categoría filosófica, expresa un carácter conductual, que se asume como una actitud (ethos) frente a un mundo digital. Este "ethos" configura una relacionalidad entre Lo humano y La máquina, construye puentes de apertura (apertus) que consolida unidades de posibilidad existencial a través de prácticas que manifiestan, no una digitalización, sino, una digitalización, esto es, una praxis particular y singular que, en el marco digital, pretende comprender intencionalmente el campo existencial del ser humano en las lógicas digitales. Esta digitalización como práctica, configura, "el presente" que en el marco de lo digital se constituye en una racionalidad, una especie de capacidad que tienen los seres humanos de analizar a través de un ejercicio mental la realidad existencial de sí mismo y de su entorno.

Abstract The present as a philosophical category, expresses a behavioral character, which is assumed as an attitude (ethos) towards a digital world. This "ethos" configures a relationship between the human and the machine, builds bridges of opening (apertus) that consolidates units of existential possibility through practices that manifest, not a digitization, but a digitiza-tion, that is, a praxis particular and unique that, in the digital framework, intends to intentionally understand the existential field of the human being in digital logics. This digitaliza-tion as a practice configures "the present" that in the digital framework constitutes a rationality, a kind of capacity that human beings have to analyze through a mental exercise the existential reality of themselves and of your environment.

Resumo O presente como categoria filosófica expressa um caráter comportamental, que se assume como uma atitude (ethos) em relação a um mundo digital. Esse "ethos" configura uma relação entre o humano e a máquina, constrói pontes de abertura (apertus) que consolida unidades de possibilidade existencial por meio de práticas que manifestam, não uma digitalização, mas uma digitalização, ou seja, uma práxis particular e única que, no quadro digital, pretende compreender intencionalmente o campo existencial do ser humano nas lógicas digitais. Essa digitaliza-ção como prática configura "o presente" que no quadro digital constitui uma racionalidade, uma espécie de capacidade que os seres humanos têm de analisar por meio de um exercício mental a realidade existencial de si e de seu ambiente.

A preliminary study on the logical data and knowledge map of the ancient book Nv Ke Xin Fa based on knowledge element indexing / 国际中医中药杂志

Objective:Using the information technology of knowledge element theory to analyze the content of the ancient Chinese medicine book Nv Ke Xin Fa, and to explore the original thinking and implicit knowledge of the author of the book Nv Ke Xin Fa. Methods:Based on the theory and technology of knowledge element, the indexing data was read as logical data by using MS SQL Server database and then the knowledge graph of traditional Chinese medicine was constructed by using neo4j database.Results:There are 345 knowledge bodies and 1 478 knowledge elements in the Nv Ke Xin Fa, mainly including prescription name (280), composition (275) and usage (224); There are 711 semantic types, mainly including prescriptions (232), etiology and pathogenesis (221), syndrome manifestations (125) and treatment (88); 187 semantic associations, mainly syndrome differentiation and treatment (172); Knowledge of semantic association.There are 34 body types, with leucorrhea (16), amenorrhea (13), blood Avalanche (13) and asthenia (13). Conclusions:Zheng Qinyu paid attention to distinguishing the texture of leucorrhea in the treatment of leucorrhea, put forward the pathogenesis and treatment principles and methods of leucorrhea in the stages of "before childbirth" and "after childbirth", and made it clear that the application scope of Buzhong Yiqi Decoction involves menstruation, leucorrhea, pregnancy and the whole cycle of childbirth.Mrs Zheng Qinyu pays great attention to the protection on the spleen and stomach of the middle coke and regulation of Qi that could rise and fall, which could provide a reference for modern clinical diagnosis and treatment of leukorrhagia diseases.

Research progress on the application of artificial intelligence technology in the diagnosis of oral and maxillofacial tumors / 口腔疾病防治

@#With the improvement of computer computing capability and the accumulation of a large amount of medical data, artificial intelligence is gradually being applied in the diagnosis of oral and maxillofacial tumors. Artificial intelligence technology can assist doctors in clinical diagnosis and improve the efficiency of clinical work and the accuracy of diagnosis. In recent years, researchers have focused primarily on the recognition of medical images. The commonly used method is to annotate a large number of images by experts for learning image features by machines. The available literature has been able to utilize artificial intelligence technology to diagnose tumors by analyzing medical images, pathological sections, and tumor photos. The main issues in the current research are uneven labeling data quality, small data size, limited research problems, and single data modalities. These problems need to be solved through the continuous improvement of algorithms and the accumulation of high-quality data. The future direction of artificial intelligence applications should be to integrate medical data from multiple sources, assist doctors in diagnosis, and explore a variety of noninvasive and easy-to-use new methods for the early diagnosis of tumors. This may completely change the existing diagnosis and treatment model of oral and maxillofacial tumors.

Prevention and treatment system design and digital management practice of venous thromboembolism in hospital / 中华医院管理杂志

Venous thromboembolism(VTE)is a high mortality disease involving multiple factors, and public hospitals assume the main responsibility for the diagnosis and treatment of VTE. Based on the concept of taking patients as the center, Zhejiang Provincial People′s Hospital improved the system design and digital level, and carried out digital practices such as patient timeline management, high-risk patient management, VTE special disease bank, and auxiliary decision-making system. The hospital evaluation rate and prevention rate continued to increase, the follow-up effect was good, and the workload of medical staff was reduced and satisfaction rate was improved.

Construction of an Information Platform for Cervical Cancer Prevention in the Digital Era / 中国医学科学院学报

The advent of the digital era brings new challenges and opportunities for cervical cancer prevention and research.With the development of digital techniques in China,the construction of an information platform for cervical cancer prevention based on the current achievements has become an important trend.This paper expounds the importance,existing problems,and challenges of the data integration of population-based cervical cancer screening and the information platform construction,and puts forwards effective measures to promote its construction.The establishment of an information platform for cervical cancer prevention in the digital era has far-reaching significance for the global elimination of cervical cancer.

Application of multi-modal digital MOOCs teaching in the standardized residency training of obstetrics and gynecology / 中华医学教育探索杂志

Objective:To explore the application of multi-modal digital massive open online courses (MOOCs) mode in the standardized residency training of obstetrics and gynecology.Methods:A total of 40 residents who entered the training program of obstetrics and gynecology from September 2018 to February 2020 were selected as the control group, and 40 residents from March 2020 to August 2020 were selected as the study group. The control group adopted the traditional teaching method, and the study group adopted the multi-modal digital MOOCs teaching method. The scores of theoretical examination and skill operation examination after the standardized training, clinical ability examination before and after the standardized training and teaching satisfaction were compared between the two groups. SPSS 22.0 was performed for t test and chi-square test. Results:After the standardized training, the scores of theoretical knowledge [(88.53±6.04) vs. (79.67±5.52)] and skill operation [(85.52±6.33) vs. (71.15±7.86)] in the study group were significantly higher than those in the control group ( P < 0.05). After the standardized training, the scores of all kinds of clinical ability of the two groups were higher than before ( P < 0.05), and the scores of all items in study group were higher ( P < 0.05). The satisfaction of all aspects of teaching in the study group was higher than that in the control group ( P < 0.05). Conclusion:The application of multi-modal digital MOOCs teaching mode in the standardized residency training of obstetrics and gynecology can strengthen the learning and mastering of theoretical knowledge, operational skills and the cultivation of clinical ability, and significantly improve the quality of teaching with high teaching satisfaction.

Application of digital prosthesis in the repair of palatal fistula in rabbits / 中国组织工程研究

BACKGROUND: Digital impression technology has been widely used in the oral field. Compared with traditional impression technology, it is more convenient and accurate. OBJECTIVE: To explore the application of digital prosthesis for repairing palatal fistula in rabbits. METHODS: The rabbit models of palatal fistula were established by surgery. One month later, 10 rabbit models of palatal fistula were scanned by digital intraoral scanning system. The medical silicone rubber prosthesis for palatal fistula was manufactured by digital impression technology and digital design. After wearing the prosthesis, SUN LB, LAN YY, ZHOU HY, HUY. Application of digital prosthesis In me repair of palatal fistula In rabbits.  Zhongguo Zuzhi Gongcheng Yanjiu. 2020;24(14):2192-2196. DPI:10.3969/j.issn.2095-4344.2228 the accuracy, retention and sealing properties of the prosthesis were examined. The study was approved by the Laboratory Animal Ethical Committee of Hospital of Stomatology, Southwest Medical University. RESULTS AND CONCLUSION: After digital prosthesis repaired palatal fistula, the accuracy, retention and sealing properties of the prosthesis were good. To conclude, the digital prosthesis for palatal fistula repair by digital impression technology achieves accurate repair, and has certain clinical values.

Development of the African Digital Health Library (ADHL): Experience at the Medical Library, University of Ibadan, Nigeria

The African Digital Health Library, (ADHL) is a collaborative project involving five African institutions namely Bamako University of Science and Technology, Kenya Methodist University, Universities of Ibadan, Nairobi, Zambia, and Zimbabwe. The University of Ibadan Nigeria component of the ADHL (ADHL-UI) is described in this paper. Funded by the Office of Global AIDS Coordinator of the United States Department of State, the goal of ADHL-UI is to store, preserve, make accessible through an institutional repository, theses and dissertations by postgraduate students of the institution's College of Medicine. The ADHL-UI has over 1000 theses and dissertations accessible on the internet. Creation of the ADHL-UI, a repository of theses and dissertations in the Medical Library, University of Ibadan, is a major contribution to research development and preservation of institutional scholarly heritage. Effective use by students and faculty will help in reducing duplication of research efforts and create visibility for the authors and the institution.

Research progress on the precision of digital impressions used in implant-supported fixed prostheses / 口腔疾病防治

@#Since the digital impression technique has already been widely used in dental therapy, it has grown into a popular option among implant practitioners. The advantages of the digital impression technique are as follows: better experience for patients during the treatment; less chair-side time consumption; and reliability in making the precise impression. Thus, we reviewed the relevant factors that impact the precision of the digital impression technique and introduced its influence mechanism through an evidence-based method that was based on analyzing in vitro and in vivo literature published within the previous 5 years, with a focus on such considerations as relevant factors to dentists, digital impression systems, patients, and the environment. A review of the literature showed that the main factors that have a large influence on impression precision are imaging techniques and the software for the impression system. However, due to the development of impression systems that are restricted at scientific and technological levels, impression precision is affected by multiple factors, such as scanning techniques, dentist operation proficiency, material and contours of scanbodies, patient conditions, and ambient light. Dentists are advised to scientifically choose the impression system, limit ambient light and adopt direct techniques that could enhance impression precision. In the future, the development of impression systems could reduce the systematic errors, decrease the operating complexity of dentists, and improve impression precision.

Research progress of orthodontic indirect bonding technology / 口腔疾病防治

@#Accurate positioning of brackets is a necessary condition for ideal orthodontic treatment. Traditional bracket bonding technology has certain limitations, such as long operation time and poor accuracy. Indirect bonding technology is a method that bonding brackets on the model through intraoral impression or scanning, and then the brackets are accurately bonded to the tooth crowns using a transfer tray. In this article, the progression of transfer trays and adhesive agents, the application of digital technology in indirect bonding technology, indirect bonding for invisible appliances, and the prospect of this technology are reviewed. The literature review results show that indirect bonding technology can locate the bracket accurately, the operation is simple, the patient’s experience is comfortable, and the clinical efficiency can be significantly improved, the photocurable adhesive is an ideal adhesive for indirect bonding technology. With the development of digital technology, indirect bonding technology will be able to locate the brackets with increasing accuracy, thus achieving the "digital precision movement" of the teeth. The bonding technology of invisible appliance accessories is essentially a type of indirect bonding technology, It requires indirect bonding technology and digital technology to highly fit the needs of computer design accessories for the visual tooth movement and the use of indirect bonding technology to accurately bond accessories, ultimately achieving the desired tooth movement. Indirect bonding technology will play an increasingly important role with the development of digital technology and invisible correction technology.

Identification of Artemisiae Annuae Herba Based on Algorithm for Diversity of XML Tree Map / 中国实验方剂学杂志

Objective: To study and create the algorithm for the diversity (AD) of extensible markup language (XML) tree map, and provide a new tool for the identification of Artemisiae Annuae Herba. Method: According to the literature research, the key information of Artemisiae Annuae Herba was selected from the macroscopic, mesoscopic and microscopic information, etc. Based on the key information, the relevant upper standards of domestic and foreign professional fields were cited to assign the unique identification independent of language for each data element, and the coding rules of relevant data elements were established. The digital coding technology was applied to the flexible structure editor, and the tree map was created, which could be returned as the 5th version of hypertext markup language (HTML5) or XML format. Based on the diversity related algorithms, the authors innovatively developed the AD of XML tree map of Artemisiae Annuae Herba, which took into account both of topology and semantics, and the expression model of related mathematical functions of Artemisiae Annuae Herba was established. By comparing the calculation results with the reality, the algorithm model was debugged continuously until the convergence of the core-culvert algorithm model. Result: Through the research on AD, the diversity between two XML tree maps could be calculated, and the discrimination or identification model of Artemisiae Annuae Herba also could be finally optimized and established. After calculation and analysis of the tested tree maps, the effective rate of the model was 100%. Conclusion: In this study, the establishment of the AD of XML tree map can effectively assist in the identification of Artemisiae Annuae Herba, which provides certain technical support and theoretical guidance for the research on intelligent application of traditional Chinese medicine.

The application of digital surgical template in bimaxillary orthognathic surgery / 中华整形外科杂志

Objective@#To investigate the feasibility and accuracy using digital surgical guide to position the jaws in bimaxillary orthognathic surgery.@*Methods@#16 patients with dento-maxillofacial deformity were included from January to December 2018 in Nanjing Stomatological Hospital. There were 10 males and 6 females, all of which were skeletal Ⅲ deformity. The mean age was 21.3 years old (16 to 28 years). They were divided into digital guide (group A) and traditional model surgery (group B) according to the treatment sequence. All patients underwent both Lefort Ⅰ osteotomy and bilateral ascending sagittal split. Virtual surgery was performed and digital three-dimensional surgical template was printed before surgery in group A. During the operation, digital surgical templates were used to position maxilla and mandible. The accuracy was evaluated by generating color distribution map of deviation grade, which was imaging fusion of virtual surgical jaw position and actual surgical jaw position to measure the deviation distance of each marker point one week after surgery. The deviations between the preoperative design and the actual operation were compared with the t-test respectively in group A and group B, and the independent sample t test was chosen to compared the accuracy of reduction between the two groups in sagittal, horizontal, and vertical directions.@*Results@#All 16 patients had primary healing. The maximum deviation of the patients in group A was at U6. The deviation direction was vertical, and the deviation distance was (1.67±0.32) mm. In group A, the deviation distances of all marker points in the sagittal, horizontal and vertical directions were (0.55±0.26) mm (t=2.985, P=0.205), (0.62±0.20) mm (t=2.672, P=0.193) and (1.07±0.62) mm (t=5.122, P=0.823), respectively. The result in group B was (0.63±0.28) mm(t=3.397, P=0.307), (0.71±0.42) mm (t=4.438, P=0.541) and (1.82±0.36) mm (t=1.115, P=0.021) in these directions. There was no significant difference between two groups in the sagittal (t=4.704, P=0.763) and lateral (t=4.008, P=0.615) directions, and the difference in the vertical (t=1.432, P=0.037) direction was statistically significant.@*Conclusions@#The digital guides were feasible to position jaws accurately in orthognathic surgery.

Design of image diagnostic module for tent-form field medical system / 医疗卫生装备

Object To develop an easy-assembled and-disassembled image diagnostic module to solve the problems of the tent-form field medical system in size, weight, mobility, accessories, protection and etc, which is of high references for combination and integration scheme of large-scale digital imaging equipment by adopting box instrumentation.Methods The module had its design executed with system modeling, structure simulation and CAD after its service requirements were analyzed. The design fell into the ones for overall framework, combination mode, packaging and buffer vibration isolation, ergonomics, box instrumentation, radiography accessories for vertical and horizontal positions, protection device and etc.Results The module was gifted with radiodiagnosis-related performances such as digital radiography, digital diagnosis,diagnosis reporting, compatibility to vertical- and horizontal- position radiography, and radiation protection during war conditions.Conclusion The module developed gains advantages in power, continuous radiography, assembling and disassembling, accessories and protection, and thus meets the requirements of the tent-form field medical system in mass casualties imaging diagnosis.

Computer-aided design of digital plating for acetabular fracture of posterior wall associated with hip dislocation / 中华创伤骨科杂志

Objective To evaluate the computer-aided design of digital plating for acetabular fracture of posterior wall associated with hip dislocation.Methods A retrospective study was conducted to analyze the 32 patients who had been admitted for acetabular fracture of posterior wall associated with hip dislocation between June 2012 and August 2016.They were 22 men and 10 women with a mean age of 42.1 years (from 21 to 57 years).They were divided according to the treatment methods into 2 groups:an observational group (n =15) subjected to digital plating and a control group (n =17) subjected to conventional plating.All the patients were treated through the Kocher-Langenbeck approach.For the patients in the observational group,patient-specific digital steel plates were manufactured after simulation of fracture reduction,design of individualized steel plate and simulation of steel plating in the computer software before operation.The 2 groups were compared in terms of operation time,intraoperative bleeding,intraoperative fluoroscopy,hospital stay,fracture reduction and hip joint function at the last follow-up and postoperative complications as well.Results For the observational group,the operation time (73.3 ± 15.2 min) was significantly shorter than that for the control group (93.2 ± 14.7 min),the intraoperative bleeding (254.3 ±63.lmL) and the intraoperative fluoroscopy (2.4 ± 0.7 times) were significantly less than those for the control group (334.6 ±70.3 mL;3.2 ±0.8 times) (P ＜ 0.05).There were no significant difference between the 2 groups in the good to excellent rate of reduction [93.3％ (14/15) versus 88.2％ (15/17)] (P ＞ 0.05).All the patients were followed up for an average of 28.1 months (from 8 to 48 months).There was no significant difference either between the 2 groups in the modified Merle d'Aubigné-Postel scores at the last follow-up (16.4 ± 1.8 versus 15.8 ± 1.6) (P ＞ 0.05).There was a significant difference between the observational and control groups in the incidence of heterotopic ossification [6.7％ (1/1) versus 17.6％ (3/17)] (P ＜0.05).Conclusions In the treatment ofacetabular fracture of posterior wall associated with hip dislocation,computer-aided design of digital plating may have advantages of shorter operation time,less intraoperative blood loss,less intraoperative fluoroscopy and lower incidence of heterotopic ossification.