Objective:To establish a three-dimensional finite element model of maxillary complex with cleft palate.Methods:Spiral CT scanning images of maxilla were obtained from a male patient with cleft palate.The data were used to build up different range finite element model of maxillary structure with cleft palate using ANSYS software.Result:The model of maxillary complex with cleft palate could reflect the maxillary structural properties of the cleft palate.Conclusions:Combined with spiral CT and ANSYS software technique finite element model of cleft palate maxillary complex can be established.

BACKGROUND:The comfortable shoes can absorb or reduce the impact force from the ground. Is the damped system is absent in shoes to relieve the impulse,the feet will be extremely tired,even damage the human knee joint,waist,back and brain. OBJECTIVE:To measure the changes of human plantar pressure by different sole hardness through the measurement system of plantar pressure. DESIGN,TIME AND SETTING:An observation experiment was performed in the Shanghai University of Sport between December 2008 and February 2009.PARTICIPANTS:Six volunteers wearing the experimental designed shoes were recruited from Nanjing Institute of Physical Education.METHODS:Three pairs of experimental shoes weighing 103 g were measured with shore hardness tester,as 51,62 and 69 hardness values. Accordingly they were named soft shoes,medium hardness shoes and hard shoes. The subjects were asked to do a 60-minute walk test at the speed of 2 m/s on the running platform with the experimental designed shoes,and they were determined using the insole plantar pressure measurement system of German's Novel style series of Emed-pedar.MAIN OUTCOME MEASURE:The pressure,contact area and impulse in the sole of foot.RESULTS:With the increase in hardness soles,the pressure of center plantar was shown to move from the medial first metatarsal outwards by turns. Compared with barefoot walking,the trail length of the center plantar was prolonged in subjects with medium hardness shoes and hard shoes,while shortened in subjects with soft shoes. The total pressure when you walked with soft shoes and medium hardness shoes were reduced than barefoot walking,and the pressure of walking phase wearing these two types of shoes were also reduced,while total pressure and walking phase pressure with hard shoes were both increased compared with barefoot walking. The contact area was similar between soft shoes and medium hardness shoes,but the smallest in the hard shoes. Except the increase in the initial 10 minutes,the soft shoes had no change with the medium hardness shoes. The hard shoes were firstly increased but then declined. The total impulse of medium hardness shoes was the closest to bare feet,while that of soft shoes and hard shoes were increased compared with bare foot.CONCLUSION:The plantar pressure was the greatest in the hard shoes,then medium hardness shoes and last soft shoes;the contact area was the greatest in soft shoes,then medium hardness shoes and last hard shoes;the impulse was the greatest in hard shoes,then soft shoes,and last medium hardness shoes.

Objective: To study the effect of palate repair operation on middle ear function. Methods: Cleft palate was repaired with double-opposing Z-plasty(DOZ) in 20 cases and with routin method (RM ) in 23 cases. Secretory otitismedia (SOM), high negative pressure (HNP), stapedial reflex(SR) and low acoustic compliance (LAC) were determined 3d before and 6 months after operation respectively. Results: Of the total 86 ears, before operation the persentages of SOM, HNP, SR and LAC were 61. 63, 75. 58, 29. 07 and 65. 15; after operation those were 31.39, 43.02, 66.28 and 33.72, respectively. Of the 40 ears of the cases treated with DOZ the persentages of those were 20.00, 27.50, 72.50 and 25.00) while of the 46 ears of the cases treated with RM those were 41.30, 56.52, 60.87 and 41.30 respectivellly. Conclusion: Middle ear function can be improved by palate repairs surgery, better results may be achieved with double opposing Z-plasty technique.

Objective:To establish a soft tissue 3-dimension(3D)finite element model of human palate.Methods:Based on the intrinsic finite element model of human maxilla,palatal mucoperiosteum flap with the thickness of 3.06 mm was added on the oral side of the plate model by ANSYS software,material property of the soft tissue was loaded,the soft tissue 3D finite element model of the palate was established.Results:By applying finite element method,the established 3D finite element model could reflect biomechani-cal properties of the soft tissue of the palate on computer.Conclusion:The 3D finite element model of the soft tissue of human palate provides the foundation for further study.

Objective:To study the impact of palatal scar force on the maxilla with unilateral cleft palate by finite element model. Methods:A 3-dimension finite element model of maxilla with cleft palate containing soft tissue was established,the soar force on the maxilla was analyzed by ansys.Results:Cleft area was identified as the center of rotation,cleft side of the maxilla reflected clock-wise rotation and non-cleft side anticlockwise rotation.The maxilla moved from outside to inside in cross section and front to back in the sagittal plane,and the former was greater than the latter.The outside of alveolar process was subjected to stress of mainly drawing force,the inside to stress of mainly compressive force.The deformation of maxilla was mainly in the front-end.Deformation of the alveolar was greater than that of maxilla body.Among deformations of three dimensions,the width was the largest,the length was the smallest,and the height was between both above.Conclusion:Along with the rotation of the maxilla,cleft area becomes gradually smaller.Among the three dimensions,the width is the largest,the length is the smallest and the height is between the both.The af-fect on maxilla is mainly in the front-end.The affect on the alveolar is greater than that on the maxilla body.

To investigate the biomechanical influences on two different cleft maxillary 3D finite element models pre- and post-alveolar bone graft, we developed a cleft palate bony model from a 17 year cleft palate male CT scan data and built an alveolar bone-grafted cleft maxillary 3D finite element model through gluing the graft model. Apply vector lip force on the anterior face of the models. Study the press (including S3 principal, S1 principal, von Mises and shear) distribution properties and localized area. The results suggested that the press principal spreads along the alveolar ridge and formed several focused areas. After bone grafted, the shear stress tends to be evenly. The grafted alveolar could resist the medially deformation of alveolar crest and the shear stress to the nasal base bony structure. The conclusions from results demonstrated that the deformation of alveolar ridge is possibly due to the lip pressure after the lip repair. The shear stress along the alveolar ridge could cause the severity of the dentition. The grafted bony structure could even the shear stress distribution evenly other than the distribution properties.
Adolescent ; Alveolar Process ; surgery ; Alveolar Ridge Augmentation ; methods ; Biomechanical Phenomena ; Bone Transplantation ; Cleft Palate ; diagnostic imaging ; physiopathology ; surgery ; Finite Element Analysis ; Humans ; Imaging, Three-Dimensional ; Male ; Maxilla ; diagnostic imaging ; physiopathology ; surgery ; Models, Biological ; Tomography, Spiral Computed

Objective:To study the correlation between early postsurgery phonetic acquisition of speech stop and speech outcomes of young children.Methods:28 children with cleft palate were included in the study.An one-stage palatal repair procedure was per-formed by one surgeon for the children before the age of 1 8 months.Naming tests were used in the speech therapy room when the chil-dren were aged 23 months and 30 months.Stop consonant inventory number,percent correct consonants(PCC),percent correct man-ners(PCM)and percent correct places(PCP)were analyzed.Results:Number of stop consonant was significantly correlated with PCC,PCM and PCP at 24 and 30 months of age in the children.Coefficient of determination between stop consonant number and PCC was 0.535.Conclusion:Speech stop may be used as the “sensitive sound”for the analysis of speech development of the chinese children aged 2-3 years after cleft palate repair and as the individuation guideline to determine the best assessment and therapy time.