Objective:To analyse the stress distribution of the tooth and inlay with the restoration of resin,porcelain,gold alloy,co-balt chromium materials respectively.Methods:3-D finite element models of mandibular first molar with meiso-occlusal (class II) cavity and different inlays were established.Von-mises stress distribution on the tooth and inlay with vertical load and lingual load at 45°were analyzed.Results:After restoration peak stress of high elastic module materials and dental inlays was higher than that of the low elastic module material inlays,however,the restorations of the different elastic module materials had the similar stress distribution trend.The stress under of lateral load(lingual at 45°)to the teeth inlays was significantly higher than that under vertical load.Peak stress concentration of tooth was on the bottom of the cavity near the pulp chamber dentin;inlay peak stress distribution is mainly in its corresponding to the gingival wall.In the tooth tissues stress level of the contact surface of inlay restoration,the strength was as the fol-lowing:Composite resin inlay >ceramics inlay >the gold alloy ceramics inlay >cobalt chromium alloy inlay.The stress level of the inlay of the four kinds of inlay restoration materials was just opponent with the tooth tissues.Conclusion:Gingival wall is the weakest part of meiso-occlusal(class II)cavity inlay restoration,while near the pulp chamber at the bottom of the cavity is the weakest part of the tooth.Among the 4 materials Under the same load condition,composite resin inlay restoration has minimal tooth stress and uniform stress distribution,and can reduce the posibility of odontoschism and microleakage.

OBJECTIVE:To understand the current situation and problems of the human resources of herbalists in Chongqing, and to provide reference for the relevant departments in formulating development plan for herbalists and promoting the healthy and sustainable development of Chinese medicine industry. METHODS:Chongqing municipal health and family planning commission is-sued the questionnaires to investigate the post distribution,educational background,job title and advanced study of medicine staff in Chongqing medical institutions. RESULTS:Questionnaires were gathered and reported by county health bureaus with effective re-covery rate of 100%. There were totally 19 713 Chinese medicine practitioners in Chongqing,including 1 739 herbalists,account-ing for 8.8%. Only 1.7%of the herbalists were graduate degrees,and the proportion of highly educated herbalists was low. The pri-mary professional position of the herbalists accounted only 59.5% and senior professional position was only 4.7%,the professional titles of herbalists were generally on the low side. The proportion of further education for herbalists was only 3.2%. There were sig-nificant differences in the ages,working time,highest education,professional positions and post properties and further studies among different economic areas(P<0.05). Herbalists of one-hour economic circle had higher educational level and higher profes-sional position than other two areas. CONCLUSIONS:Chongqing is lack of herbalists,and lack of the senior professional posi-tions,their education level is low and further education rate is low. In order to promote the development of Chinese medicine,it is necessary to strengthen the training and introduction of outstanding and young talents,strengthen the continuing education and regu-lar standardized training,improve the salary and welfare treatment for authorized strength and positions and balance the training for herbalists in different economic areas.

ABSTRACT:Objective To analyze the stress changes of tooth tissues in the medial-occlusal (Class Ⅱ)cavity restored with different kinds of inlay materials by the three-dimensional (3-D)finite element.Methods The inlay restored 3-D finite element model of medial-occlusal (Class Ⅱ)cavity was established by CBCT scanning method and reverse engineering software Mimics,Geomagic Studio,Pro/E5.0 software,and finite element analysis software. The Von-mises stress and change tendency of tooth tissues and four different kinds of inlay materials were compared after taking vertical loading and tongue 45°to loading.Results There were different stress levels of tooth tissues among different inlays of medial-occlusal (MO)Class Ⅱ cavity.The stress level of the cobalt chromium alloy inlay was the largest,the stress level of the gold alloy inlay was lower,and the stress level of the composite inlay was the lowest.Dental tissues stress distribution was similar for the four different restorative materials,and focused on hole bottom of dentin near the pulp in dentin.Conclusion Compared with ceramics,gold alloy and cobalt chromium inlay restoration,restoration with composite resin inlay can reduce the organization stress of the remaining tooth in the medial-occlusal (Class Ⅱ)cavity type.

OBJECTIVETo study the quantitative measurement of the extent of malrotation after interlocking intramedullary nailing of femoral shaft fracture.

METHODCT scan ("routine method") applied in 36 femoral shaft fractures that had been treated with close reduction and interlocking intramedullary nailing. For the judgement of the extent of malrotation, the anteversion of both fracture side and contralateral side were measured and the difference between the 2 sides was evaluated. The increase of anteversion represented internal rotation of the distal fragment, whereas the decrease of anteversion represented external rotation.

RESULTSThe maximum anteversion of the fracture sides, whereas 48 degrees, the minimum anteversion -10 degrees, the mean value, 15.04 degrees, and the standard error is 11.34 degrees. The maximum anteversion of the contralateral side, whereas 31.3 degrees, minimum -4.8 degrees, the mean value was 13.96 degrees and the standard error was 10.20 degrees (P < 0.001). Compared with the contralateral side, half of the 36 cases showed increased anteversion and the other half decreased anteversion. The mean value of internal rotation is 11.56 degrees, and external rotation 9.39 degrees. The maximum internal rotation was 37 degrees, the minimum 0.9 degrees. Eight cases had internal rotation less than 8 degrees, 6 between 10 degrees - 15 degrees, and 4 over 15 degrees. The maximum external rotation was 24.3 degrees, and the minimum 1.8 degrees. Eleven cases had external rotation less than 10 degrees, 4 between 10 degrees - 15 degrees and 3 over 15 degrees. The incidence of malrotation more than 10 degrees was 47% (17/36), and more than 15 degrees 19.4% (7/36).

CONCLUSIONThe incidence of malrotation after femoral shaft fracture treated with close reduction and interlocking intramedullary nailing is high. Attention should be paid to clinical management and strict control for rotational reduction intra-operatively.

Adolescent ; Adult ; Bone Nails ; Female ; Femoral Fractures ; diagnostic imaging ; pathology ; surgery ; Fracture Fixation, Intramedullary ; methods ; Humans ; Male ; Middle Aged ; Rotation ; Tomography, X-Ray Computed