BACKGROUND:In recent years,with the development of biological scaffold materials and bioprinting technology,tissue-engineered bone has become a research hotspot in bone defect repair. OBJECTIVE:To summarize the current treatment methods for bone defects,summarize the biomaterials and bioprinting technology for preparing tissue-engineered bone scaffolds,and explore the application of biomaterials and printing technology in tissue engineering and the current challenges. METHODS:Search terms were"bone defect,tissue engineering,biomaterials,3D printing technology,4D printing technology,bioprinting,biological scaffold,bone repair"in Chinese and English.Relevant documents published from January 1,2009 to December 1,2022 were retrieved on CNKI,PubMed and Web of Science databases.After being screened by the first author,high-quality references were added.A total of 93 articles were included for review. RESULTS AND CONCLUSION:The main treatment methods for bone defects include bone transplantation,membrane-guided regeneration,gene therapy,bone tissue engineering,etc.The best treatment method is still uncertain.Bone tissue engineering technology is a new technology for the treatment of bone defects.It has become the focus of current research by constructing three-dimensional structures that can promote the proliferation and differentiation of osteoblasts and enhance the ability of bone formation.Biological scaffold materials are diverse,with their characteristics,advantages and disadvantages.A single biological material cannot meet the demand for tissue-engineered bone for the scaffold.Usually,multiple materials are combined to complement each other,which is to meet the demand for mechanical properties while taking into account the biological properties of the scaffold.Bioprinting technology can adjust the pore of the scaffold,build a complex spatial structure,and is more conducive to cell adhesion,proliferation and differentiation.The emerging 4D printing technology introduces"time"as the fourth dimension to make the prepared scaffold dynamic.With the synchronous development of smart materials,4D printing technology provides the possibility of efficient repair of bone defects in the future.

Objective:To investigate the distribution of physical and chemical water improvement areas of drinking water-borne endemic fluorosis in Inner Mongolia Autonomous Region, as well as the use of household water purifiers.Methods:From April to October 2021, a survey was conducted in a drinking water-borne endemic fluorosis areas in Inner Mongolia Autonomous Region where physical and chemical water improvement was carried out. The survey included the basic situation of the affected villages (number of permanent households, number of permanent residents, historical water fluoride content) and the use of residential water purifiers. Household peripheral water samples were collected to test the water fluoride content. Water purifier installation rate, normal usage rate, qualified water fluoride rate in normal usage, and the proportion of households covered by filter replacement departments were calculated.Results:In Inner Mongolia Autonomous Region, the physical and chemical water improvement areas of drinking water-borne endemic fluorosis were distributed in 2 735 villages in 11 leagues (cities) throughout the region, with 192 950 permanent households and 540 216 permanent residents. The average historical water fluoride content in all leagues (cities) was 2.18 mg/L, and the current average water fluoride content was 0.40 mg/L. A total of 134 763 water purifiers were installed, with an installation rate of 69.84% (134 763/192 950). A total of 10 773 households were surveyed, with 10 396 households using water purifiers normally and a normal usage rate of 96.50% (10 396/10 773). Among them, 10 158 households had qualified water fluoride of normal usage, with a qualified water fluoride rate of 97.71% (10 158/10 396). Of the 10 396 households using water purifiers normally, 3 974 households (38.23%) had filter cartridges used within one year, and 3 961 households had qualified water fluoride, with a qualified rate of water fluoride of 99.67% (3 961/3 974). Six thousand four hundred and twenty-two households (61.77%) had filter cartridges used for more than one year, with 6 197 households had qualified water fluoride and a qualified rate of water fluoride of 96.50% (6 197/6 422). There was a statistically significant difference in the qualified rate of water fluoride between purifiers with different filter cartridge usage times (χ 2 = 110.73, P < 0.001). Among the 10 773 surveyed households, the filter cartridges replacement department covered 10 470 households, accounting for 97.19% (10 470/10 773). Conclusions:In Inner Mongolia Autonomous Region, the physical and chemical water improvement areas of drinking water-borne endemic fluorosis are widely distributed, and the normal usage rate of household water purifiers is relatively high. The qualified rate of water fluoride in household water purifiers with filter cartridges used for more than one year is low.

Objective:To investigate the arsenic metabolism pattern and possible influencing factors in the population in drinking-water-borne endemic arsenic poisoning (drinking-water-borne arsenic poisoning for short) areas.Methods:In December 2004, a cluster sampling method was used to select arsenic poisoning population (arsenic poisoning group) and healthy population (control group) in drinking-water-borne arsenic poisoning area of Bayannur City, Inner Mongolia Autonomous Region as the survey subjects. A questionnaire survey was conducted. Arsenic content in drinking water at home of survey subjects, the levels of urinary arsenic and its metabolites, including [trivalent arsenic (As Ⅲ), inorganic arsenic (iAs), monomethylarsenic acid (pentavalent, MMA V), dimethylarsenic acid (pentavalent, DMA V), total arsenic (tAs), percentage of inorganic arsenic (iAs%), percentage of monomethylarsenic acid (MMA%), percentage of dimethylarsenic acid (DMA%), primary methylation index (PMI), secondary methylation index (SMI)] were tested using high performance liquid chromatography-inductively coupled plasma mass spectrometry; nail arsenic and nail selenium levels were tested using atomic fluorescence spectrometer. The influencing factors of arsenic metabolism pattern were analyzed by multiple linear regression. Results:A total of 536 survey subjects were included, including 155 individuals in the arsenic poisoning group and 381 in the control group. The water arsenic level ranged from 0.0 to 825.7 μg/L. Compared with the control group, there was no significant difference in the distribution of gender, education level and dental fluorosis in the arsenic poisoning group ( P > 0.05), but there were significant differences in the distribution of age, marital status, smoking, drinking and water arsenic ( P < 0.05). Compared with the control group, the levels of urinary As Ⅲ, iAs, MMA V, DMA V, tAs, MMA%, MMA/DMA and nail arsenic in the arsenic poisoning group were higher ( P < 0.05), while the levels of urinary DMA%, SMI and nail selenium were lower ( P < 0.05); but there was no statistically significant difference in the levels of urinary iAs% and PMI ( P > 0.05). Gender, education level, depth of wells, water arsenic, total number of wells and nail arsenic were the influencing factors of urinary As Ⅲ (β = - 19.82, - 23.83, 0.61, 0.21, 7.26, 2.98, P < 0.05). Age, depth of wells, water arsenic and nail arsenic were the influencing factors of urinary tAs (β = 3.18, 3.25, 1.31, 15.59, P < 0.05). Gender, education level, depth of wells, water arsenic, total number of wells and nail arsenic were the influencing factors of urinary iAs (β = - 20.47, - 25.90, 0.64, 0.25, 7.87, 3.11, P < 0.05). Age, gender, education level, water arsenic and nail arsenic were the influencing factors of urinary MMA V (β = 0.52, - 17.07, - 21.84, 0.22, 2.77, P < 0.05). Age, depth of wells, water arsenic and nail arsenic were the influencing factors of urinary DMA V (β = 2.35, 2.47, 0.85, 9.22, P < 0.05). Conclusions:Compared with healthy individuals, there are differences in arsenic metabolism pattern among individuals with drinking-water-borne arsenic poisoning. Age, gender, education level, depth of wells, water arsenic, total number of wells and nail arsenic may be influencing factors of different arsenic metabolism patterns.

Objective:Based on the investigation on the advantages of Traditional Chinese Medicine(TCM)participation in the field of basic public health services,exploring how TCM participates in public health.Methods:It searched for policies related to basic public health services and conducted a questionnaire survey on 2 995 people working in public health-related jobs in Beijing to conduct an empirical study on the advantages of Chinese medicine and the current status of participation.Results:2 982 valid questionnaires were collected,and practitioners in the field of public health services in Beijing had a high level of attention and recognition towards the participation of TCM.TCM is generally considered to have obvious advantages in basic public health services such as responding to epidemics,preventing and treating chronic diseases,and managing the health of Children 0-6 Years and the elderly.However,TCM shows overall shortcomings in emphasis,talent allocation,infrastructure construction,public perception and resource balance.Conclusion:To play the ascendant role and enhance the service capacity of TCM,basic public health services can be further developed by optimizing mechanisms related to the participation of TCM in disease prevention and control,chronic disease management,children's,and elderly health management.Basic public health services can enhance the service capacity of TCM from several aspects such as increasing financial support,strengthening the cultivation and management of TCM talents,and emphasizing grassroots and balanced resource allocation of TCM.

Objective:Based on the investigation on the advantages of Traditional Chinese Medicine(TCM)participation in the field of basic public health services,exploring how TCM participates in public health.Methods:It searched for policies related to basic public health services and conducted a questionnaire survey on 2 995 people working in public health-related jobs in Beijing to conduct an empirical study on the advantages of Chinese medicine and the current status of participation.Results:2 982 valid questionnaires were collected,and practitioners in the field of public health services in Beijing had a high level of attention and recognition towards the participation of TCM.TCM is generally considered to have obvious advantages in basic public health services such as responding to epidemics,preventing and treating chronic diseases,and managing the health of Children 0-6 Years and the elderly.However,TCM shows overall shortcomings in emphasis,talent allocation,infrastructure construction,public perception and resource balance.Conclusion:To play the ascendant role and enhance the service capacity of TCM,basic public health services can be further developed by optimizing mechanisms related to the participation of TCM in disease prevention and control,chronic disease management,children's,and elderly health management.Basic public health services can enhance the service capacity of TCM from several aspects such as increasing financial support,strengthening the cultivation and management of TCM talents,and emphasizing grassroots and balanced resource allocation of TCM.

Objective:Based on the investigation on the advantages of Traditional Chinese Medicine(TCM)participation in the field of basic public health services,exploring how TCM participates in public health.Methods:It searched for policies related to basic public health services and conducted a questionnaire survey on 2 995 people working in public health-related jobs in Beijing to conduct an empirical study on the advantages of Chinese medicine and the current status of participation.Results:2 982 valid questionnaires were collected,and practitioners in the field of public health services in Beijing had a high level of attention and recognition towards the participation of TCM.TCM is generally considered to have obvious advantages in basic public health services such as responding to epidemics,preventing and treating chronic diseases,and managing the health of Children 0-6 Years and the elderly.However,TCM shows overall shortcomings in emphasis,talent allocation,infrastructure construction,public perception and resource balance.Conclusion:To play the ascendant role and enhance the service capacity of TCM,basic public health services can be further developed by optimizing mechanisms related to the participation of TCM in disease prevention and control,chronic disease management,children's,and elderly health management.Basic public health services can enhance the service capacity of TCM from several aspects such as increasing financial support,strengthening the cultivation and management of TCM talents,and emphasizing grassroots and balanced resource allocation of TCM.

Objective:Based on the investigation on the advantages of Traditional Chinese Medicine(TCM)participation in the field of basic public health services,exploring how TCM participates in public health.Methods:It searched for policies related to basic public health services and conducted a questionnaire survey on 2 995 people working in public health-related jobs in Beijing to conduct an empirical study on the advantages of Chinese medicine and the current status of participation.Results:2 982 valid questionnaires were collected,and practitioners in the field of public health services in Beijing had a high level of attention and recognition towards the participation of TCM.TCM is generally considered to have obvious advantages in basic public health services such as responding to epidemics,preventing and treating chronic diseases,and managing the health of Children 0-6 Years and the elderly.However,TCM shows overall shortcomings in emphasis,talent allocation,infrastructure construction,public perception and resource balance.Conclusion:To play the ascendant role and enhance the service capacity of TCM,basic public health services can be further developed by optimizing mechanisms related to the participation of TCM in disease prevention and control,chronic disease management,children's,and elderly health management.Basic public health services can enhance the service capacity of TCM from several aspects such as increasing financial support,strengthening the cultivation and management of TCM talents,and emphasizing grassroots and balanced resource allocation of TCM.

Objective:Based on the investigation on the advantages of Traditional Chinese Medicine(TCM)participation in the field of basic public health services,exploring how TCM participates in public health.Methods:It searched for policies related to basic public health services and conducted a questionnaire survey on 2 995 people working in public health-related jobs in Beijing to conduct an empirical study on the advantages of Chinese medicine and the current status of participation.Results:2 982 valid questionnaires were collected,and practitioners in the field of public health services in Beijing had a high level of attention and recognition towards the participation of TCM.TCM is generally considered to have obvious advantages in basic public health services such as responding to epidemics,preventing and treating chronic diseases,and managing the health of Children 0-6 Years and the elderly.However,TCM shows overall shortcomings in emphasis,talent allocation,infrastructure construction,public perception and resource balance.Conclusion:To play the ascendant role and enhance the service capacity of TCM,basic public health services can be further developed by optimizing mechanisms related to the participation of TCM in disease prevention and control,chronic disease management,children's,and elderly health management.Basic public health services can enhance the service capacity of TCM from several aspects such as increasing financial support,strengthening the cultivation and management of TCM talents,and emphasizing grassroots and balanced resource allocation of TCM.

Objective:Based on the investigation on the advantages of Traditional Chinese Medicine(TCM)participation in the field of basic public health services,exploring how TCM participates in public health.Methods:It searched for policies related to basic public health services and conducted a questionnaire survey on 2 995 people working in public health-related jobs in Beijing to conduct an empirical study on the advantages of Chinese medicine and the current status of participation.Results:2 982 valid questionnaires were collected,and practitioners in the field of public health services in Beijing had a high level of attention and recognition towards the participation of TCM.TCM is generally considered to have obvious advantages in basic public health services such as responding to epidemics,preventing and treating chronic diseases,and managing the health of Children 0-6 Years and the elderly.However,TCM shows overall shortcomings in emphasis,talent allocation,infrastructure construction,public perception and resource balance.Conclusion:To play the ascendant role and enhance the service capacity of TCM,basic public health services can be further developed by optimizing mechanisms related to the participation of TCM in disease prevention and control,chronic disease management,children's,and elderly health management.Basic public health services can enhance the service capacity of TCM from several aspects such as increasing financial support,strengthening the cultivation and management of TCM talents,and emphasizing grassroots and balanced resource allocation of TCM.

Objective:Based on the investigation on the advantages of Traditional Chinese Medicine(TCM)participation in the field of basic public health services,exploring how TCM participates in public health.Methods:It searched for policies related to basic public health services and conducted a questionnaire survey on 2 995 people working in public health-related jobs in Beijing to conduct an empirical study on the advantages of Chinese medicine and the current status of participation.Results:2 982 valid questionnaires were collected,and practitioners in the field of public health services in Beijing had a high level of attention and recognition towards the participation of TCM.TCM is generally considered to have obvious advantages in basic public health services such as responding to epidemics,preventing and treating chronic diseases,and managing the health of Children 0-6 Years and the elderly.However,TCM shows overall shortcomings in emphasis,talent allocation,infrastructure construction,public perception and resource balance.Conclusion:To play the ascendant role and enhance the service capacity of TCM,basic public health services can be further developed by optimizing mechanisms related to the participation of TCM in disease prevention and control,chronic disease management,children's,and elderly health management.Basic public health services can enhance the service capacity of TCM from several aspects such as increasing financial support,strengthening the cultivation and management of TCM talents,and emphasizing grassroots and balanced resource allocation of TCM.