1.Expert consensus on the diagnosis and treatment of osteoporotic proximal humeral fracture with integrated traditional Chinese and Western medicine (version 2024)
Xiao CHEN ; Hao ZHANG ; Man WANG ; Guangchao WANG ; Jin CUI ; Wencai ZHANG ; Fengjin ZHOU ; Qiang YANG ; Guohui LIU ; Zhongmin SHI ; Lili YANG ; Zhiwei WANG ; Guixin SUN ; Biao CHENG ; Ming CAI ; Haodong LIN ; Hongxing SHEN ; Hao SHEN ; Yunfei ZHANG ; Fuxin WEI ; Feng NIU ; Chao FANG ; Huiwen CHEN ; Shaojun SONG ; Yong WANG ; Jun LIN ; Yuhai MA ; Wei CHEN ; Nan CHEN ; Zhiyong HOU ; Xin WANG ; Aiyuan WANG ; Zhen GENG ; Kainan LI ; Dongliang WANG ; Fanfu FANG ; Jiacan SU
Chinese Journal of Trauma 2024;40(3):193-205
Osteoporotic proximal humeral fracture (OPHF) is one of the common osteoporotic fractures in the aged, with an incidence only lower than vertebral compression fracture, hip fracture, and distal radius fracture. OPHF, secondary to osteoporosis and characterized by poor bone quality, comminuted fracture pattern, slow healing, and severely impaired shoulder joint function, poses a big challenge to the current clinical diagnosis and treatment. In the field of diagnosis, treatment, and rehabilitation of OPHF, traditional Chinese and Western medicine have accumulated rich experience and evidence from evidence-based medicine and achieved favorable outcomes. However, there is still a lack of guidance from a relevant consensus as to how to integrate the advantages of the two medical systems and achieve the integrated diagnosis and treatment. To promote the diagnosis and treatment of OPHF with integrated traditional Chinese and Western medicine, relevant experts from Orthopedic Expert Committee of Geriatric Branch of Chinese Association of Gerontology and Geriatrics, Youth Osteoporosis Group of Orthopedic Branch of Chinese Medical Association, Osteoporosis Group of Orthopedic Surgeon Branch of Chinese Medical Doctor Association, and Osteoporosis Committee of Shanghai Association of Integrated Traditional Chinese and Western Medicine have been organized to formulate Expert consensus on the diagnosis and treatment of osteoporotic proximal humeral fracture with integrated traditional Chinese and Western medicine ( version 2024) by searching related literatures and based on the evidences from evidence-based medicine. This consensus consists of 13 recommendations about the diagnosis, treatment and rehabilitation of OPHF with integrated traditional Chinese medicine and Western medicine, aimed at standardizing, systematizing, and personalizing the diagnosis and treatment of OPHF with integrated traditional Chinse and Western medicine to improve the patients ′ function.
2.Quality evaluation for Beidougen Formula Granules
Gui-Yun CAO ; Xue-Song ZHUANG ; Bo NING ; Yong-Qiang LIN ; Dai-Jie WANG ; Wei-Liang CUI ; Hong-Chao LIU ; Xiao-Di DONG ; Meng-Meng HUANG ; Zhao-Qing MENG
Chinese Traditional Patent Medicine 2024;46(3):717-723
AIM To evaluate the quality of Beidougen Formula Granules.METHODS Fifteen batches of standard decoctions and three batches of formula granules were prepared,after which paste rate and contents,transfer rates of magnoflorine,daurisoline,dauricine were determined.HPLC specific chromatograms were established,and cluster analysis was adopted in chemical pattern recognition.RESULTS For three batches of formula granules,the paste rates were 15.1%-16.6%,the contents of magnoflorine,daurisoline,dauricine were 18.93-19.39,9.42-9.60,6.79-6.85 mg/g with the transfer rates of 34.42%-35.25%,43.81%-44.65%,27.27%-27.51%from decoction pieces to formula granules,respectively,and there were seven characteristic peaks in the specific chromatograms with the similarities of more than 0.95,which demonstrated good consistence with those of standard decoctions and accorded with related limit requirements.Fifteen batches of standard decoctions were clustered into two types,and the medicinal materials produced from Jilin,Hebei,Shangdong could be used for the preparation of formula granules.CONCLUSION This reasonable and reliable method can provide references for the quality control and clinical application of Beidougen Formula Granules.
3.Xuebijing improves intestinal microcirculation dysfunction in septic rats by regulating the VEGF-A/PI3K/Akt signaling pathway
Tang A-LING ; Li YAN ; Sun LI-CHAO ; Liu XIAO-YU ; Gao NAN ; Yan SHENG-TAO ; Zhang GUO-QIANG
World Journal of Emergency Medicine 2024;15(3):206-213
BACKGROUND:This study aims to explore whether Xuebijing(XBJ)can improve intestinal microcirculation dysfunction in sepsis and its mechanism. METHODS:A rat model of sepsis was established by cecal ligation and puncture(CLP).A total of 30 male SD rats were divided into four groups:sham group,CLP group,XBJ+axitinib group,and XBJ group.XBJ was intraperitoneally injected 2 h before CLP.Hemodynamic data(blood pressure and heart rate)were recorded.The intestinal microcirculation data of the rats were analyzed via microcirculation imaging.Enzyme-linked immunosorbent assay(ELISA)kits were used to detect the serum levels of interleukin-6(IL-6),C-reactive protein(CRP),and tumor necrosis factor-α(TNF-α)in the rats.Histological analysis and transmission electron microscopy were used to analyze the injury of small intestinal microvascular endothelial cells and small intestinal mucosa in rats.The expression of vascular endothelial growth factor A(VEGF-A),phosphoinositide 3-kinase(P13K),phosphorylated P13K(p-PI3K),protein kinase B(Akt),and phosphorylated Akt(p-Akt)in the small intestine was analyzed via Western blotting. RESULTS:XBJ improved intestinal microcirculation dysfunction in septic rats,alleviated the injury of small intestinal microvascular endothelial cells and small intestinal mucosa,and reduced the systemic inflammatory response.Moreover,XBJ upregulated the expression of VEGF-A,p-PI3K/total P13K,and p-Akt/total Akt in the rat small intestine. CONCLUSION:XBJ may improve intestinal microcirculation dysfunction in septic rats possibly through the VEGF-A/PI3K/Akt signaling pathway.
4.Clinical Study on the Treatment of Insomnia in the Elderly with the Spleen-Strengthening,Blood-Activating and Phlegm-Resolving Chinese Herbal Medicine Based on the Theory of "Muscular Atrophy,Qi-Passage Blockage" Recorded in the Huang Di Nei Jing
Chao WANG ; Jian-Qiang MEI ; Sai-Qiang YAN ; Xun ZHANG ; Ao LIU ; Xiao-Yan YOU ; Li CHENG
Journal of Guangzhou University of Traditional Chinese Medicine 2024;41(7):1730-1737
Objective To explore the clinical efficacy of Chinese herbal medicine with the actions of invigorating spleen,activating blood and resolving phlegm in the treatment of senile insomnia based on the theory of"muscular atrophy,qi-passage blockage"recorded in Huang Di Nei Jing(The Yellow Emperor's Inner Classic,shortened as Nei Jing).Methods A total of 120 elderly patients with insomnia were randomly divided into observation group and control group,with 60 cases in each group.The control group was treated with oral use of Dexzopiclone Tablets,and the observation group was treated with oral use of decoction of Chinese herbal medicine for invigorating spleen,activating blood and resolving phlegm.The course of treatment covered 4 weeks.Before and after treatment,the two groups were observed in the changes of Pittsburgh Sleep Quality Index(PSQI)score,Insomnia Severity Index(ISI)score,polysomnography(PSG)related parameters of total sleep time(TST),number of awakenings(AN)and sleep latency(SL),mean blood flow velocity of anterior cerebral artery(ACA),middle cerebral artery(MCA),and posterior cerebral artery(PCA),and serum levels of 5-hydroxytryptamine(5-HT)and melatonin(MT).After treatment,the clinical efficacy and safety of the two groups were evaluated.Results(1)After 4 weeks of treatment,the total effective rate of the observation group was 93.33%(56/60),which was slightly higher than 90.00%(54/60)of the control group,but the difference was not statistically significant(P>0.05).(2)After treatment,the item scores and total scores of PSQI in the two groups were lower than those before treatment(P<0.05),and the decrease of the scores of sleep quality,sleep time,sleep efficiency,and daytime function as well as total scores in the observation group was significantly superior to that in the control group(P<0.05).However,there was no significant difference of time for falling asleep and sleep disorder scores between the two groups(P>0.05).After 4 weeks of drug withdrawal,the item scores of PSQI in the observation group continued to decrease compared with those after treatment(P<0.05),but there was no significant difference in the control group(P<0.05).(3)After treatment,the ISI scores in the two groups were decreased when compared with those before treatment(P<0.05),and the decrease in the observation group was superior to that in the control group(P<0.05).After 4 weeks of drug withdrawal,the ISI score of the observation group continued to decrease compared with that after treatment(P<0.05),while the control group had no significant change,and the difference was not statistically significant(P>0.05).(4)After treatment,the PSG related parameters such as TST,AN and SL in the two groups were improved when compared with those before treatment(P>0.05),and the improvement of TST and AN in the observation group was superior to that in the control group(P>0.05).(5)After treatment,the mean blood flow velocity of ACA,MCA and PCA in the observation group was improved compared with that before treatment(P<0.05),while there was no significant change in the control group compared with that before treatment(P>0.05).The improvement of the mean blood flow velocity of ACA,MCA and PCA in the observation group was significantly superior to that in the control group(P<0.05).(6)After treatment,the levels of serum 5-HT and MT in the two groups were increased when compared with those before treatment(P<0.05),and the increase in the observation group was superior to that in the control group(P<0.05).(7)The incidence of adverse reactions in the observation group was 5.00%(3/60),which was slightly lower than 13.33%(8/60)in the control group,but the difference was not statistically significant(P>0.05).Conclusion Based on the theory of"muscular atrophy,qi-passage blockage"recorded in Nei Jing,the Chinese herbal medicine for invigorating spleen,activating blood and resolving phlegm exerts certain effect in treating senile insomnia.It can effectively improve the sleep quality and daytime function of patients,enhance sleep efficiency,increase sleep time,reduce the number of awakenings,alleviate the severity of insomnia,improve brain function,and regulate the level of neurotransmitters,with remarkably long-term effect and reliable safety.
5.A cross-sectional study of functional disability rate of anxiety disorder and risk factors in Chinese community adults
Yang LI ; Yueqin HUANG ; Zhaorui LIU ; Tingting ZHANG ; Chao MA ; Lingjiang LI ; Yifeng XU ; Tao LI ; Xiufeng XU ; Yaqin YU ; Yongping YAN ; Zhizhong WANG ; Xiangdong XU ; Limin WANG ; Qiang LI ; Guangming XU ; Shuiyuan XIAO
Chinese Mental Health Journal 2024;38(11):929-935
Objective:To describe functional disability rate of anxiety disorders in Chinese community adults and explore related risk factors of functional disability.Methods:To conduct in-depth data analysis on China Mental Health Survey(CMHS).The diagnostic tool for anxiety disorders was the Composite International Diagnostic Inter-view-3.0,according to the Diagnostic and Statistical Manual for Mental Disorders,Fourth Edition(DSM-Ⅳ).The World Health Organization Disability Assessment Schedule,2nd edition,was the functional disability assessment standard for anxiety disorders.Weighted 12-month functional disability rate of DSM-Ⅳ anxiety disorder with co-morbidities and only anxiety disorder in population and those in patients,as well as days of partial disability were calculated.The effects of anxiety disorders comorbid other mental disorders and physical diseases and demographic factors on the severity and occurrence of functional disability were analyzed by multiple linear regression and logis-tic regression.Results:The functional disability rate of anxiety disorder with comorbidities in population was 1.7%,and 42.2%in patients,in which constituent rate of grade-four disability was the highest as 84.1%.The functional disability rate of only anxiety disorder in population was 0.3%,and 17.8%in patients.The medians of days of partial disability days in the past 30 days were from 0 to 14.42.Multiple linear regression showed a positive association between comorbid anxiety disorder with other mental disorders and physical diseases(β=0.24),comor-bid other mental disorders and physical diseases(β=0.21),physical diseases(β=0.18),comorbid anxiety disor-der and physical diseases(β=0.15),comorbid anxiety disorder with other mental disorders(β=0.08),other men-tal disorders(β=0.07),only anxiety disorder(β=0.06),lower education level(β=0.12),lower economic status(β=0.08),older age(β=0.06),non-marital status(β=0.06),male(β=0.02)and the severity of functional dis-ability.Logistic regression showed that comorbid anxiety with other mental disorders and physical diseases(OR=64.07),comorbid anxiety disorders with other mental disorders(OR=36.75),comorbid other mental disorders with physical diseases(OR=20.60),comorbid anxiety with physical diseases(OR=18.88),anxiety disorder(OR=9.20),other mental disorders(OR=6.65),physical diseases(OR=4.00),65 years old and over(OR=4.40),50 to 64 years old(OR=2.33),low economic status(OR=2.10),illiterate and below primary school educational level(OR=1.89),middle economic status(OR=1.70),elementary school educational level(OR=1.59),non-marital status(OR=1.47),male(OR=1.16)were the risk factors of the occurrence of functional disability.Conclusion:Comorbidity of anxiety disorders and other mental disorders,and physical diseases increases severity and occurrence of functional disability.Comorbidity,male,gender,older age,lower economic and educa-tional level and non-marital are risk factors of anxiety disorder functional disability.
6.A cross-sectional study of disability rate of dementia and risk factors in Chinese old people
Wenlei WU ; Yueqin HUANG ; Zhaorui LIU ; Tingting ZHANG ; Chao MA ; Yifeng XU ; Tao LI ; Xiufeng XU ; Yaqin YU ; Yongping YAN ; Zhizhong WANG ; Xiangdong XU ; Limin WANG ; Qiang LI ; Guangming XU ; Shuiyuan XIAO ; Lingjiang LI
Chinese Mental Health Journal 2024;38(11):936-942
Objective:To describe disability rates of dementia in community residents aged 65 years and over in China,and explore related risk factors of disability.Methods:This study conducted an in-depth data analysis of the China Mental Health Survey.World Health Organization Disability Assessment Schedule 2.0(WHODAS 2.0)was used to assess dementia disability,Community Screening Interview for Dementia(CSID)and Geriatric Mental Status Examination(GMS)were used for dementia screening and diagnosing.Univariate analysis was used to calcu-late the weighted disability rates of dementia in population and in patients,and their population distribution.Multiple linear regression and logistic regression were used to analyze the risk factors of the occurrence of dementia disability and its severity.Results:The weighted disability rate of dementia was 2.1%in population,and 38.6%in pa-tients.The disability rates of comorbid dementia in population and in patients were higher than those of patients with only dementia.Female,older age,lower education level,lower economic status,and lower cognitive test scores in CSID had higher disability rates of dementia in population.Female and urban resident had higher disability rates of dementia in patients.Multiple linear regression showed economic status(β=0.11),gender(β=0.11),age(β=0.10),and treatment in the last 12 months(β=-0.20)were statistically associated with WHODAS 2.0 scores.Multiple logistic regression showed female(OR=2.81)and treatment in the last 12 months(OR=2.38)were statistically associated with disability.Conclusions:Persons with low economic status,female and elderly peo-ple are the high-risk groups for dementia disability.It should be paid attention to prevent dementia and its conse-quential disabilities.
7.Consistency of chemical constituents between formula granules and standard decoction of Coptidis Rhizoma
Dai-Liang ZHANG ; Xin-Na DONG ; Lei SHI ; Xiao-Di DONG ; Yong-Qiang LIN ; Rong-Fei ZHANG ; Jing-Hua ZHANG ; Yuan-Cheng YAO ; Feng-Chao ZHANG ; Gui-Yun CAO ; Zhao-Qing MENG
Chinese Traditional Patent Medicine 2024;46(9):2851-2858
AIM To investigate the consistency of chemical constituents between formula granules and standard decoction of Coptidis Rhizoma.METHODS Eighteen batches of standard decoctions were prepared,after which the extraction rate and contents,transfer rates of magnolflorine,jatrorrhizine,columbamine,epiberberine,coptisine,palmatine,berberin were determined,HPLC characteristic chromatograms were established.RESULTS There were 11 common peaks in the characteristic chromatograms of 18 batches of standard decoctions and 24 batches of formula granules with the similarities of 0.861-1.000,which were clusterd into two categories.The formula granules and standard decoction demonstrated approximated extraction rate and contents,transfer rates of index constituents.CONCLUSION The chemical constituents between formula granules and standard decoction of Coptidis Rhizoma display good consistency,which can provide references for the quality control,process research and clinical application of the former.
8.Grape Seed Extract Attenuates Demyelination in Experimental Autoimmune Encephalomyelitis Mice by Inhibiting Inflammatory Response of Immune Cells.
Qing WANG ; Yang-Yang CHEN ; Zhi-Chao YANG ; Hai-Jun YUAN ; Yi-Wei DONG ; Qiang MIAO ; Yan-Qing LI ; Jing WANG ; Jie-Zhong YU ; Bao-Guo XIAO ; Cun-Gen MA
Chinese journal of integrative medicine 2023;29(5):394-404
OBJECTIVE:
To examine the anti-inflammatory effect of grape seed extract (GSE) in animal and cellular models and explore its mechanism of action.
METHODS:
This study determined the inhibitory effect of GSE on macrophage inflammation and Th1 and Th17 polarization in vitro. Based on the in vitro results, the effects and mechanisms of GSE on multiple sclerosis (MS)-experimental autoimmune encephalomyelitis (EAE) mice model were further explored. The C57BL/6 mice were intragastrically administered with 50 mg/kg of GSE once a day from the 3rd day to the 27th day after immunization. The activation of microglia, the polarization of Th1 and Th17 and the inflammatory factors such as tumor necrosis factor- α (TNF- α), interleukin-1 β (IL-1 β), IL-6, IL-12, IL-17 and interferon-γ (IFN-γ) secreted by them were detected in vitro and in vivo by flow cytometry, enzyme linked immunosorbent assay (ELISA), immunofluorescence staining and Western blot, respectively.
RESULTS:
GSE reduced the secretion of TNF-α, IL-1 β and IL-6 in bone marrow-derived macrophages stimulated by lipopolysaccharide (P<0.01), inhibited the secretion of TNF-α, IL-1 β, IL-6, IL-12, IL-17 and IFN-γ in spleen cells of EAE mice immunized for 9 days (P<0.05 or P<0.01), and reduced the differentiation of Th1 and Th17 mediated by CD3 and CD28 factors (P<0.01). GSE significantly improved the clinical symptoms of EAE mice, and inhibited spinal cord demyelination and inflammatory cell infiltration. Peripherally, GSE downregulated the expression of toll-like-receptor 4 (TLR4) and Rho-associated kinase (ROCKII, P<0.05 or P<0.01), and inhibited the secretion of inflammatory factors (P<0.01 or P<0.05). In the central nervous system, GSE inhibited the infiltration of CD45+CD11b+ and CD45+CD4+ cells, and weakened the differentiation of Th1 and Th17 (P<0.05). Moreover, it reduced the secretion of inflammatory factors (P<0.01), and prevented the activation of microglia (P<0.05).
CONCLUSION
GSE had a beneficial effect on the pathogenesis and progression of EAE by inhibiting inflammatory response as a potential drug and strategy for the treatment of MS.
Mice
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Animals
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Encephalomyelitis, Autoimmune, Experimental/pathology*
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Grape Seed Extract/therapeutic use*
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Interleukin-17
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Interleukin-1beta
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Tumor Necrosis Factor-alpha/metabolism*
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Interleukin-6/metabolism*
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Th1 Cells
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Mice, Inbred C57BL
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Interferon-gamma/therapeutic use*
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Th17 Cells/metabolism*
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Interleukin-12/therapeutic use*
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Cytokines/metabolism*
9.Expert consensus on late stage of critical care management.
Bo TANG ; Wen Jin CHEN ; Li Dan JIANG ; Shi Hong ZHU ; Bin SONG ; Yan Gong CHAO ; Tian Jiao SONG ; Wei HE ; Yang LIU ; Hong Min ZHANG ; Wen Zhao CHAI ; Man hong YIN ; Ran ZHU ; Li Xia LIU ; Jun WU ; Xin DING ; Xiu Ling SHANG ; Jun DUAN ; Qiang Hong XU ; Heng ZHANG ; Xiao Meng WANG ; Qi Bing HUANG ; Rui Chen GONG ; Zun Zhu LI ; Mei Shan LU ; Xiao Ting WANG
Chinese Journal of Internal Medicine 2023;62(5):480-493
We wished to establish an expert consensus on late stage of critical care (CC) management. The panel comprised 13 experts in CC medicine. Each statement was assessed based on the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) principle. Then, the Delphi method was adopted by 17 experts to reassess the following 28 statements. (1) ESCAPE has evolved from a strategy of delirium management to a strategy of late stage of CC management. (2) The new version of ESCAPE is a strategy for optimizing treatment and comprehensive care of critically ill patients (CIPs) after the rescue period, including early mobilization, early rehabilitation, nutritional support, sleep management, mental assessment, cognitive-function training, emotional support, and optimizing sedation and analgesia. (3) Disease assessment to determine the starting point of early mobilization, early rehabilitation, and early enteral nutrition. (4) Early mobilization has synergistic effects upon the recovery of organ function. (5) Early functional exercise and rehabilitation are important means to promote CIP recovery, and gives them a sense of future prospects. (6) Timely start of enteral nutrition is conducive to early mobilization and early rehabilitation. (7) The spontaneous breathing test should be started as soon as possible, and a weaning plan should be selected step-by-step. (8) The waking process of CIPs should be realized in a planned and purposeful way. (9) Establishment of a sleep-wake rhythm is the key to sleep management in post-CC management. (10) The spontaneous awakening trial, spontaneous breathing trial, and sleep management should be carried out together. (11) The depth of sedation should be adjusted dynamically in the late stage of CC period. (12) Standardized sedation assessment is the premise of rational sedation. (13) Appropriate sedative drugs should be selected according to the objectives of sedation and drug characteristics. (14) A goal-directed minimization strategy for sedation should be implemented. (15) The principle of analgesia must be mastered first. (16) Subjective assessment is preferred for analgesia assessment. (17) Opioid-based analgesic strategies should be selected step-by-step according to the characteristics of different drugs. (18) There must be rational use of non-opioid analgesics and non-drug-based analgesic measures. (19) Pay attention to evaluation of the psychological status of CIPs. (20) Cognitive function in CIPs cannot be ignored. (21) Delirium management should be based on non-drug-based measures and rational use of drugs. (22) Reset treatment can be considered for severe delirium. (23) Psychological assessment should be conducted as early as possible to screen-out high-risk groups with post-traumatic stress disorder. (24) Emotional support, flexible visiting, and environment management are important components of humanistic management in the intensive care unit (ICU). (25) Emotional support from medical teams and families should be promoted through"ICU diaries"and other forms. (26) Environmental management should be carried out by enriching environmental content, limiting environmental interference, and optimizing the environmental atmosphere. (27) Reasonable promotion of flexible visitation should be done on the basis of prevention of nosocomial infection. (28) ESCAPE is an excellent project for late stage of CC management.
Humans
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Consensus
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Critical Care/methods*
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Intensive Care Units
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Pain/drug therapy*
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Analgesics/therapeutic use*
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Delirium/therapy*
;
Critical Illness
10.Measuring and analysis of the shoulder circumferences of 840 adults' permanent teeth crown preparations.
Wei Liang WU ; Xun Tao GAN ; Bo Chao LI ; Yan Hua ZHANG ; Yue Mei LIAO ; Wan Ting LIN ; Xiao Qiang LIU ; Jiang CHEN
Chinese Journal of Stomatology 2023;58(5):422-426
Objective: To measure and analyze the shoulder circumferences of adults' permanent teeth crown preparations based on data collected through the intraoral scanning, so as to provide dental anatomy data for clinical diagnosis and analysis. Methods: Intraoral scanning data of 840 complete crown preparations were collected, and were entrusted to the World Dental Laboratory Co., Ltd. in Fuzhou between March 2021 and June 2022. Except the data of the third molar, the rest data were categorized in terms of 14 tooth positions in the upper and lower jaw (each category involved 30 samples from male group and 30 samples from female group). Image measurement software was used to measure the shoulder circumferences of permanent teeth crown preparations. And analysis was conducted to reveal the difference of shoulder circumference diameters between male and female groups. And then they were grouped according to the mean value at each tooth position, on the premise that the difference between the maximum and minimum values and the mean value of the entire group was≤±1.00 mm. Analysis were further conducted to determine the differences of shoulder circumference diameters between each dental position and the differences between male and female in the same groups. Results: Bivariate analysis of variance showed that gender had no effect on the shoulder circumference of full crown preparations (F=0.55, P=1.457), while tooth position had a significant impact on the shoulder circumference of full crown preparations (F=273.15, P<0.001). The samples were classified into 5 groups according to the mean values of shoulder circumference diameters relating to each tooth position. Statistical analysis showed that Group 1, covering maxillary lateral incisor, mandibular central incisor and mandibular lateral incisor, had shoulder circumference with diameters of (16.62±2.21) mm; Group 2, consisting of maxillary central incisor, maxillary cusp, mandibular cusp, mandibular first premolar and mandibular second premolar, had diameters of (20.78±2.48) mm; Group 3, consisting of maxillary first premolar and maxillary second premolar, had diamerters of (22.09±2.72) mm; Group 4, covering maxillary first molar, maxillary second molar and mandibular first molar, had diamerters of (30.21±2.67) mm; while group 5, with mandibular second molar alone its member, had diamerters of (31.34±3.18) mm. The difference among the 5 groups was statistically significant (P<0.05). Conclusions: Significant differences of shoulder circumference diameters could be found between different tooth positions, while at the same tooth position, the differences between male and female are not significant. The 14 tooth positions could be grouped into 5 groups according to their shoulder circumference diameters. Future research could take the grouping as reference.

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