1.Causes and global, regional, and national burdens of traumatic brain injury from 1990 to 2019
Xiao-Fei HUANG ; Shuai-Feng MA ; Xu-Heng JIANG ; Ren-Jie SONG ; Mo LI ; Ji ZHANG ; Tian-Jing SUN ; Quan HU ; Wen-Rui WANG ; An-Yong YU ; He LI
Chinese Journal of Traumatology 2024;27(6):311-322
Purpose::Traumatic brain injury (TBI), currently a major global public health problem, imposes a significant economic burden on society and families. We aimed to quantify and predict the incidence and severity of TBI by analyzing its incidence, prevalence, and years lived with disability (YLDs). The epidemiological changes in TBI from 1990 to 2019 were described and updated to provide a reference for developing prevention, treatment, and incidence-reducing measures for TBI.Methods::A secondary analysis was performed on the incidence, prevalence, and YLDs of TBI by sex, age group, and region ( n =21,204 countries and territories) between 1990 and 2019 using the Global Burden of Diseases, Injuries, and Risk Factors Study 2019. Proportions in the age-standardized incidence rate due to underlying causes of TBI and proportions of minor and moderate or severe TBI were also reported. Results::In 2019, there were 27.16 million (95% uncertainty intervals ( UI): 23.36 -31.42) new cases of TBI worldwide, with age-standardized incidence and prevalence rates of 346 per 100,000 population (95% UI: 298 -401) and 599 per 100,000 population (95% UI: 573 -627), respectively. From 1990 to 2019, there were no significant trends in global age-standardized incidence (estimated annual percentage changes: -0.11%, 95% UI: -0.18% --0.04%) or prevalence (estimated annual percentage changes: 0.01%, 95% UI: -0.04% -0.06%). TBI caused 7.08 million (95% UI: 5.00 -9.59) YLDs in 2019, with age-standardized rates of 86.5 per 100,000 population (95% UI: 61.1 -117.2). In 2019, the countries with higher incidence rates were mainly distributed in Central Europe, Eastern Europe, and Australia. The 2019 global age-standardized incidence rate was higher in males than in females. The 2019 global incidence of moderate and severe TBI was 182.7 per 100,000 population, accounting for 52.8% of all TBI, with falls and road traffic injuries being the main causes in most regions. Conclusions::The incidence of moderate and severe TBI was slightly higher in 2019, and TBI still accounts for a significant portion of the global injury burden. The likelihood of moderate to severe TBI and the trend of major injury under each injury cause from 1990 to 2019 and the characteristics of injury mechanisms in each age group are presented, providing a basis for further research on injury causes in each age group and the future establishment of corresponding policies and protective measures.
2.Research progress of measurement tools for health-related quality of life in patients with spinal metastases
Mengchen YIN ; Wenlong YU ; Lin LI ; Xin GAO ; Luosheng ZHANG ; Dingbang CHEN ; Quan HUANG ; Xinghai YANG ; Junming MA ; Jianru XIAO ; Wen MO
Chinese Journal of Orthopaedics 2023;43(16):1115-1122
The Health-Related Quality of Life (HRQoL) pertains to patients' subjective contentment concerning their physical, psychological, and social well-being throughout disease treatments. Predominantly employed HRQoL metrics in spinal metastases comprise the 36-item Short-Form Health Survey (SF-36), EuroQoL Five Dimensions Questionnaire (EQ-5D), European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30), and the Functional Assessment of Cancer Therapy-General (FACT-G). In clinical applications, due to their broad application and diverse disease types, combined with the lack of specificity in the scale content and the prolixity of their questionnaires, these tools often fail to capture the nuanced experiences of patients, thereby compromising the reliability and validity of the results. The Spine Oncology Study Group Outcomes Questionnaire (SOSGOQ), developed by the Spine Oncology Study Group, offers a tailored metric for spinal metastases, encapsulating both specificity and inclusivity. Its proven robust reliability and validity make it invaluable for decision-making and therapeutic efficacy appraisals. The Patient-Reported Outcome Measurement Information System (PROMIS), a novel metric suitable across many medical disciplines, facilitates cross-sector data acquisition, substantially augmenting the precision, sensitivity, and credibilityof assessments, and is pivotal in clinical investigations and interventions. As it continually evolves, PROMIS consistently outperforms traditional metrics in evaluative capacities, exhibiting impressive and consistent proficiency in prognostications, preoperative assessments, and therapeutic outcome evaluations within the spinal metastasis domain. Presently, Chinese research on the HRQoL of spinal metastasis patients remains scant, and choosing an apt, precise, and dependable metric holds significant clinical relevance. Drawing upon extant scholarly publications, this review concluded the current global HRQoL tools for spinal metastases, aiming to furnish insights for the clinical management and research pertaining to spinal metastases.
3.Canonical transient receptor potential channel 1 aggravates myocardial ischemia-and-reperfusion injury by upregulating reactive oxygen species
Hui-Nan ZHANG ; Meng ZHANG ; Wen TIAN ; Wei QUAN ; Fan SONG ; Shao-Yuan LIU ; Xiao-Xiao LIU ; Dan MO ; Yang SUN ; Yuan-Yuan GAO ; Wen YE ; Ying-Da FENG ; Chang-Yang XING ; Chen YE ; Lei ZHOU ; Jing-Ru MENG ; Wei CAO ; Xiao-Qiang LI
Journal of Pharmaceutical Analysis 2023;13(11):1309-1325
The canonical transient receptor potential channel(TRPC)proteins form Ca2+-permeable cation channels that are involved in various heart diseases.However,the roles of specific TRPC proteins in myocardial ischemia/reperfusion(I/R)injury remain poorly understood.We observed that TRPC1 and TRPC6 were highly expressed in the area at risk(AAR)in a coronary artery ligation induced I/R model.Trpc1-/-mice exhibited improved cardiac function,lower serum Troponin T and serum creatine kinase level,smaller infarct volume,less fibrotic scars,and fewer apoptotic cells after myocardial-I/R than wild-type or Trpc6-/-mice.Cardiomyocyte-specific knockdown of Trpc1 using adeno-associated virus 9 mitigated myocardial I/R injury.Furthermore,Trpc1 deficiency protected adult mouse ventricular myocytes(AMVMs)and HL-1 cells from death during hypoxia/reoxygenation(H/R)injury.RNA-sequencing-based transcriptome analysis revealed differential expression of genes related to reactive oxygen species(ROS)generation in Trpc1-/-cardiomyocytes.Among these genes,oxoglutarate dehydrogenase-like(Ogdhl)was markedly downregulated.Moreover,Trpc1 deficiency impaired the calcineurin(CaN)/nuclear factor-kappa B(NF-κB)signaling pathway in AMVMs.Suppression of this pathway inhibited Ogdhl upregulation and ROS generation in HL-1 cells under H/R conditions.Chromatin immunoprecipitation assays confirmed NF-κB binding to the Ogdhl promoter.The cardioprotective effect of Trpc1 deficiency was canceled out by overexpression of NF-κB and Ogdhl in cardiomyocytes.In conclusion,our findings reveal that TRPC1 is upregulated in the AAR following myocardial I/R,leading to increased Ca2+influx into associated cardiomyocytes.Subsequently,this upregulates Ogdhl expression through the CaN/NF-κB signaling pathway,ultimately exacerbating ROS production and aggravating myocardial I/R injury.
4.Relationship between Muscle Mass of Limbs and aGVHD in Patients with Allogeneic Hematopoietic Stem Cell Transplantation.
Wen-Jian ZHANG ; Rui-Qing ZHOU ; Ling-Fu MA ; Zhi-Min WANG ; Wen-Jian MO ; Ming ZHOU ; Xiao-Ming QUAN
Journal of Experimental Hematology 2021;29(6):1950-1956
OBJECTIVE:
To explore the correlation of limb muscle mass and acute graft-versus-host disease.
METHODS:
Clinical data from 144 patients treated by allo-HSCT in Guangzhou First People's Hospital were collected and analyzed retrospectively. The age, sex, diagnosis, donor age, sex of the donors, preparative regimen, ATG dose, HLA match, graft source, and number of infused stem cells of the patients were collected as baseline information. Meanwhile, bioelectrical impedance principle (BIA) was used to measure the limb muscle mass, body weight, body mass index (BMI), waist-to-hip ratio, upper arm muscle circumference, triceps skinfold thickness, and body fat rate of the patients before and after transplantation, so as to compare the changes of limb muscle mass and investigate its correlation with aGVHD.
RESULTS:
It was found that 61.11% of allo-HSCT patients showed muscle mass loss, and the proportion of male and female was 35.42% and 25.69%, respectively. There were reduction in the body weight, BMI, upper arm muscle circumference and muscle mass of limbs after transplantation as compared with those before transplantation (P<0.05). By comparing with the cumulative incidence of aGVHD between the patients in low muscle mass group and normal muscle mass group, it was found that the cumulative incidence of Ⅱ-Ⅳdegree aGVHD in patients with low muscle mass (30.38%) was higher than those with normal muscle mass (8.93%), which showed statistical difference (P<0.05). Univariate analysis showed that muscle mass, the sex of the donors, and preparative regimen were the influencing factors of aGVHD (P<0.05). Binary logistic regression showed that low muscle mass was the independent risk factor affecting aGVHD (P<0.05).
CONCLUSION
Patients treated by allo-HSCT shows a decline in muscle mass after transplantation, and the incidence of aGVHD is high in patients with low muscle mass. Therefore, the assessment of muscle quality in early stage in patients with HSCT can facilitate earlier detection of aGVHD.
Female
;
Graft vs Host Disease
;
Hematopoietic Stem Cell Transplantation
;
Humans
;
Male
;
Muscles
;
Retrospective Studies
;
Transplantation, Homologous
5.Correlation analysis on clinical effects of acupuncture for elderly patients with sensorineural deafness and ear distending sensation
Wen-Quan MO ; Wen-Hao CHU ; Hui YANG ; Jie WANG ; Jian PEI ; Ying LÜ
Journal of Acupuncture and Tuina Science 2018;16(4):265-270
Objective:To investigate the relationship between clinical effects of acupuncture for elderly patients with sensorineural deafness and ear distending sensation.Methods:A total of 120 elderly patients with sensorineural deafness were randomly divided into a comprehensive treatment group,an acupuncture group and a Western medicine group,with 40 cases in each group.The acupuncture group received acupuncture treatment,the Western medicine group received oral mecobalamin tablets and the comprehensive treatment group received acupuncture plus acupoint injection and auricular acupoint sticking.The values of pure tone hearing threshold test of the three groups were observed before and after treatment,and the relationship between clinical effects and ear distending sensation was compared.Results:The total effective rate of the comprehensive treatment group was 82.5% versus 67.0% in the acupuncture group and 62.5% in the Western medicine group.The inter-group comparisons showed statistically significant differences in the comprehensive treatment group versus the Western medicine group (P<0.01) and the acupuncture group (P<0.05).In the comprehensive treatment group,there were 23 cases (57.5%) with ear distending sensation,the clinical total effective rate was 86.9%;there were 17 cases (42.5%) without the sensation,the clinical total effective rate was 76.5%.In the acupuncture group,there were 24 cases (60.0%) with ear distending sensation,the clinical total effective rate was 71.0%;there were 16 cases (40.0%) without the sensation,the clinical total effective rate was 63.0%.In the Western medicine group,there were 21 cases (52.5%) with ear distending sensation,the clinical total effective rate was 66.7%;there were 19 cases (47.5%) without the sensation,the clinical total effective rate was 57.9%.The total effective rate of patients with ear distending sensation were higher than the rates of those without ear distending sensation in the three groups,but the differences were insignificant (all P>0.05).Conclusion:The comprehensive therapy is one of the effective methods to treat elderly patients with sensorineural deafness.In the three groups of elderly patients with sensorineural deafness,the relief of ear distending sensation and the hearing loss were basically simultaneous,and the hearing recovery in the patients with ear distending sensation may be slightly better than that in those without ear distending sensation.Nevertheless,further research is needed.
6.Pretreatment Serum Amyloid A and C-reactive Protein Comparing with Epstein-Barr Virus DNA as Prognostic Indicators in Patients with Nasopharyngeal Carcinoma: A Prospective Study.
Qiu Yan CHEN ; Qing Nan TANG ; Lin Quan TANG ; Wen Hui CHEN ; Shan Shan GUO ; Li Ting LIU ; Chao Feng LI ; Yang LI ; Yu Jing LIANG ; Xue Song SUN ; Ling GUO ; Hao Yuan MO ; Rui SUN ; Dong Hua LUO ; Yu Ying FAN ; Yan HE ; Ming Yuan CHEN ; Ka Jia CAO ; Chao Nan QIAN ; Xiang GUO ; Hai Qiang MAI
Cancer Research and Treatment 2018;50(3):701-711
PURPOSE: The measuring Epstein-Barr virus (EBV) DNA is an important predictor of nasopharyngeal carcinoma (NPC). This study evaluated the predictive value of pretreatment serum amyloid A (SAA) and C-reactive protein (CRP) comparing with EBV DNA in patients with NPC. MATERIALS AND METHODS: In an observational study of 419 non-metastatic NPC patients, we prospectively evaluated the prognostic effects of pretreatment SAA, CRP, and EBV DNA on survival. The primary end-point was progress-free survival (PFS). RESULTS: The median level of SAA and CRP was 4.28 mg/L and 1.88 mg/L, respectively. For the high-SAA group (> 4.28 mg/L) versus the low-SAA (≤ 4.28 mg/L) group and the high-CRP group (> 1.88 mg/L) versus the low-CRP (≤ 1.88 mg/L) group, the 5-year PFS was 64.5% versus 73.1% (p=0.013) and 65.2% versus 73.3% (p=0.064), respectively. EBV DNA detection showed a superior predictive result, the 5-year PFS in the EBV DNA ≥ 1,500 copies/mL group was obviously different than the EBV DNA < 1,500 copies/mL group (62.2% versus 77.8%, p < 0.001). Multifactorial Cox regression analysis confirmed that in the PFS, the independent prognostic factors were including EBV DNA (hazard ratio [HR], 1.788; p=0.009), tumour stage (HR, 1.903; p=0.021), and node stage (HR, 1.498; p=0.049), but the SAA and CRP were not included in the independent prognostic factors. CONCLUSION: The results of SAA and CRP had a certain relationship with the prognosis of NPC, and the prognosis of patients with high level of SAA and CRP were poor. However, the predictive ability of SAA and CRP was lower than that of EBV DNA.
C-Reactive Protein*
;
DNA*
;
Herpesvirus 4, Human*
;
Humans
;
Observational Study
;
Prognosis
;
Prospective Studies*
;
Serum Amyloid A Protein*
;
Survival Analysis
7.Combination of Tumor Volume and Epstein-Barr Virus DNA Improved Prognostic Stratification of Stage II Nasopharyngeal Carcinoma in the Intensity Modulated Radiotherapy Era: A Large-Scale Cohort Study.
Qiu Yan CHEN ; Shao Yan GUO ; Lin Quan TANG ; Tong Yu LU ; Bo Lin CHEN ; Qi Yu ZHONG ; Meng Sha ZOU ; Qing Nan TANG ; Wen Hui CHEN ; Shan Shan GUO ; Li Ting LIU ; Yang LI ; Ling GUO ; Hao Yuan MO ; Rui SUN ; Dong Hua LUO ; Chong ZHAO ; Ka Jia CAO ; Chao Nan QIAN ; Xiang GUO ; Mu Sheng ZENG ; Hai Qiang MAI
Cancer Research and Treatment 2018;50(3):861-871
PURPOSE: Little is known about combination of the circulating Epstein-Barr viral (EBV) DNA and tumor volume in prognosis of stage II nasopharyngeal carcinoma (NPC) patients in the intensity modulated radiotherapy (IMRT) era. We conducted this cohort study to evaluate the prognostic values of combining these two factors. MATERIALS AND METHODS: By Kaplan-Meier, we compare the differences of survival curves between 385 patients with different EBV DNA or tumor volume levels, or with the combination of two biomarkers mentioned above. RESULTS: Gross tumor volume of cervical lymph nodes (GTVnd, p < 0.001) and total tumor volume (GTVtotal, p < 0.001) were both closely related to pretreatment EBV DNA, while gross tumor volume of nasopharynx (GTVnx, p=0.047) was weakly related to EBV DNA. EBV DNA was significantly correlated with progress-free survival (PFS, p=0.005), locoregional-free survival (LRFS, p=0.039), and distant metastasis-free survival (DMFS, p=0.017), while GTVtotal, regardless of GTVnx and GTVnd, had a significant correlation with PFS and LRFS. The p-values of GTVtotal for PFS and LRFS were 0.008 and 0.001, respectively. According to GTVtotal and pretreatment EBV DNA level, patients were divided into a low-risk group (EBV DNA 0 copy/mL, GTVtotal < 30 cm³; EBV DNA 0 copy/mL, GTVtotal ≥ 30 cm³; or EBV DNA > 0 copy/mL, GTVtotal < 30 cm³) and a high-risk group (EBV DNA > 0 copy/mL, GTVtotal ≥ 30 cm³). When patients in the low-risk group were compared with those in the high-risk group, 3-year PFS (p=0.003), LRFS (p=0.010), and DMFS (p=0.031) rates were statistically significant. CONCLUSION: Pretreatment plasma EBV DNA and tumor volume were both closely correlated with prognosis of stage II NPC patients in the IMRT era. Combination of EBV DNA and tumor volume can refine prognosis and indicate for clinical therapy.
Biomarkers
;
Cohort Studies*
;
DNA*
;
Herpesvirus 4, Human*
;
Humans
;
Lymph Nodes
;
Nasopharynx
;
Plasma
;
Prognosis
;
Radiotherapy*
;
Tumor Burden*
8.Role of microRNA-181a in the apoptosis of tubular epithelial cell induced by cisplatin.
Han-Yu ZHU ; Mo-Yan LIU ; Quan HONG ; Dong ZHANG ; Wen-Jia GENG ; Yuan-Sheng XIE ; Xiang-Mei CHEN
Chinese Medical Journal 2012;125(3):523-526
BACKGROUNDCisplatin (DDP) is one of most effective and most commonly used therapeutic agent in treating tumors, it can accumulate in the kidney and lead to acute renal failure. MicroRNA-181a can induce cell apoptosis by suppressing the expression of Bcl-2 family. In the present study, we investigated the role of microRNA-181a in the apoptosis of tubular epithelial cell induced by DDP.
METHODSHK-2 cells were cultured, transfected with microRNA-181a inhibitor for 48 hours, and stimulated with 50 µmol/L cisplatin for 24 hours. MicroRNA-181a expression was analyzed by real time PCR, and cell apoptosis was detected by flow cytometry. Moreover, Bcl-2 and Bcl-2-associated X protein (Bax) expression were measured by Western blotting.
RESULTSMicroRNA-181a expression significantly down-regulated in cells transfected with microRNA-181a inhibitor, compared with that in untransfectd cells (21.19 ± 2.01 vs. 38.87 ± 1.97, P < 0.05). Cell apoptosis induced by DDP significantly decreased in cells transfected with MicroRNA-181a inhibitor. Compared with DDP treated cells alone, Bcl-2 expression strikingly was up-regulated and Bax expression was down-regulated in cells transfected with microRNA-181a inhibitor.
CONCLUSIONOne pathway of DDP induces apoptosis of tubular epithelial cell by suppressing Bcl-2 expression is achieved by regulating the target gene of MicroRNA-181a.
Apoptosis ; drug effects ; genetics ; Blotting, Western ; Cell Line ; Cisplatin ; pharmacology ; Flow Cytometry ; Humans ; MicroRNAs ; genetics ; metabolism ; Proto-Oncogene Proteins c-bcl-2 ; metabolism ; RNA, Small Interfering ; genetics ; Real-Time Polymerase Chain Reaction ; Reverse Transcriptase Polymerase Chain Reaction ; Transfection ; bcl-2-Associated X Protein ; metabolism
9.Design of ABC damage variable and positioning system for acetabular fractures and 1122 cases multi-center statistic analysis.
Chun-cai ZHANG ; Shuo-gui XU ; Bao-qing YU ; Fang JI ; Qing-ge FU ; Xin-wei LIU ; Yun-tong ZHANG ; Yun-fei NIU ; Pan-feng WANG ; Jia-can SU ; Lie-hu CAO ; Yong-qing XU ; Mo RUAN ; Zhuang-hong CHEN ; Ji-feng HUANG ; Xian-hua CAI ; Hui-liang SHEN ; Li-min LIU ; Ji-fang WANG ; Yan WANG ; Pei-fu TANG ; Yu-tian LIANG ; Jia-rang WANG ; Yu-ri WANG ; Zhen-hao WANG ; Wen-di LIU ; Wen-rui LI ; Wen-hu LI ; Xu-quan WANG ; Dong-sheng ZHOU ; Peng ZHANG ; Ren WANG ; Gang WANG ; Yu-yue CHEN ; Yong-jian CONG
China Journal of Orthopaedics and Traumatology 2011;24(2):102-108
OBJECTIVETo design ABC damage variable and positioning system for acetabular fracture and explore the feasibility and clinical practical value of the system through the multi-center analysis of 1122 acetabular fractures.
METHODSAccording to acetabular three-column conception, and pelvic ring lesions damage direction caused by acetabular fracture domino effect and injury degree of proximal femur joint, it defined class A as any column acetabular fracture; class B as any two-column acetabular fracture; class C as front, dome and posterior mixture acetabular fracture. Lower case English letters a, m, p represented front, dome, posterior fracture, respectively. Acetabular damage variables: 1 was simple displaced fractures; 2 was comminuted fractures; 3 was compression fractures. Pelvic ring lesions damage variables: alpha was sacroiliac joints or sacroiliac fracture horizontal separation deflection; beta was sacroiliac joints or sacroiliac fracture vertical separation deflection; gamma was pubic symphysis separation/superior and inferior ramus of pubis fracture deflection; alpha beta gamma delta was compound floating damage. Proximal humerus joint damage variables: I was femoral head fracture; II was femoral neck fracture; II was intertrochanteric fractures of femur; IV was I to III compound fracture. The ABC damage variable positioning system for acetabular fracture was made up by the above-mentioned variables. The statistics from March 1997 to February 2010 showed 1122 cases acetabular fractures with 18 cases of double side acetabular fracture and 1140 cases of acetabular fractures. The pelvics anterior-posterior view, ilium and obturator oblique view, and 2/3D-CT materials were analyzed and researched.
RESULTSEach damage variables distribution situation in 1140 cases of acetabular fracture involved A in 237 cases (20.8%), B in 605 cases (53.1%), C in 298 cases (26.1%);front column fracture in 808 cases(70.9%), dome fracture in 507 cases (44.5%), posterior fracture in 1026 cases (90%). Acetabular variables: variabe 1 in 203 cases of simple displaced fracture (17.8%); variabe 2 in 516 cases of comminuted fracture(45.3%); variabe 3 in 421 cases of compression fracture (36.9%); 249 cases of pelvic ring lesions damage (21.8%), 75 cases femoral head fracture (6.6%); 18 cases of double side acetabular fracture and relative pelvic ring and proximal humerus joint variables (1.58%). Key part and curative effect elements of 1140 cases acetabular fracture: 507 cases of dome or posterior acetabular fracture (44.5%); 421 cases of compression fracture (36.9%); 249 cases of pelvic ring variables (21.8%); 75 cases of proximal humerus joint variables (6.6%); 486 cases of simple Aa/pl/2,Bapl/2 acetabular fracture (42.6% ).
CONCLUSIONCompression fracture, especially defected compression fracture, takes important part in acetabular damage variables, and also presents that acetabular fracture with pelvic ring and proximal femoral damage variables are not rare at all. The relationship of the acetabular fracture damage variables, and its percentage shows the key points and elements in clinical treatment: weight-bearing to dome accounts for 44.5%; compression to defects account for 36.9%, pelvic ring to float accounts for 21.8%; dome fracture to double side fracture account for 6.6%. The system has significant guiding effects on clinic in terms of evaluation of injury severity, anatomic localization, difficulty index, alternative strategy, operative approach, effect of treatment,and prognosis. And the most important thing is that the system creates the comparison of damage variables in same type of fracture and the communication of homo-language and explores a new method.
Acetabulum ; injuries ; Adolescent ; Adult ; Aged ; Child ; Female ; Fractures, Bone ; classification ; diagnostic imaging ; Humans ; Male ; Medical Informatics ; methods ; Middle Aged ; Tomography, X-Ray Computed ; Young Adult
10.Effects of three types of veneering porcelain on bending strength of KAVO(TM) Y-TZP/porcelain bilayered structure.
Ting-ting MA ; Yuan-fu YI ; Long-quan SHAO ; Jie-mo TIAN ; Kang-lin HOU ; Wei-wei ZHANG ; Ning WEN ; Bin DENG
Journal of Southern Medical University 2010;30(10):2281-2287
OBJECTIVETo investigate the effect of three types of veneering porcelain on the bending strength of KAVO Y-TZP/porcelain layered structure.
METHODSKAVO zirconia ceramics were used as the substructure. To form Y-TZP/porcelain bilayered structure, a leucite-based veneering porcelain was fired on the zirconia substructures by slip-casting technique with dentin washbake, and two nano-fluorapatite-based veneering porcelains were fired on the zirconia substructures by either slip-casting or pressed-on technique with or without liner coverage. The bending strength was tested according to ISO 6872 standard, and the veneered surfaces of the fracture samples were analyzed by scanning electron microscopy (SEM).
RESULTSFor covering KAVO zirconia core material, the conventional veneering slurry-porcelain combined with liner or wash firing had significant higher bending strength than pressed-on porcelain. SEM showed that the main failure type at the interface was adhesive failure.
CONCLUSIONThin layer sintering using washbake program or liner on KAVO zirconia surface increases the surface wettability, and this procedure may be indispensable when veneering on the surface of dental zirconia.
Dental Porcelain ; Dental Stress Analysis ; Shear Strength ; Zirconium

Result Analysis
Print
Save
E-mail