جستجوی مقالات مرتبط با کلیدواژه « پیچ استخوانی » در نشریات گروه « پزشکی »

The purpose of this study was to compare different methods used for maxillary molars distalization with Temporary Anchorage Devices (TADs) with a Finite Element Analysis (FEM) method.

In this study, three different finite element models were constructed to represent three different methods of distalization. In model 1,a mini screw was inserted in the midpalatal area and used as a skeletal anchorage for the distal movement of the first and second maxillary molars. Model 2 was designed based on the insertion of mini screw in the buccal area. In model 3,a palatal plate was used for molar distalization.

IIn this study, three different finite element models were constructed to represent three different methods of distalization. In model 1,a mini screw was inserted in the midpalatal area and used as a skeletal anchorage for the distal movement of the first and second maxillary molars. Model 2 was designed based on the insertion of mini screw in the buccal area. In model 3,a palatal plate was used for molar distalization.

In model 1 and model 2, distal movement of both molars occurred, but in model 3, some mesial movement was seen in buccal cusp of the first molar and both cusps of the second molar. Maximum distalization of the first and second molar occurred in model 2.

The use of pedicle screws، thoracic and lumbar spine fusion is a standard method for the correction of spinal deformities in children. During insertion، the screws can cause complications، in this study the accuracy of the screw insertion is evaluated by CT scan after surgery. 7 children under 5 years due to spinal deformity had undergone spinal fusion surgery with pedicle screws. After surgery the location of the screws were determined by expert radiologist with using CT scan. A total of 7 patients were studied with 42 pedicle screws. More than 80% of the screws were placed in the desired location. Pedicular damage was detected in which the diameter of pedicle was low (p<. 05)، also it had been happened when surgical operation was accompanied with other complications (p<. 05). Proper placing of screws relates with pedicle diameter in which it is determined by CT scan. This study proposes the pedicular screw operation is a safe method to treat the vertebral deformities.

Scaphoid fractures are the most common fractures of the wrist. This study compared the outcomes of two surgical internal fixation techniques، using either Herbert screws (HS group) or multiple pins (MP group)، in the treatment of scaphoid fractures. This cross-sectional study was performed on 41 patients (23 in HS and 18 in MP groups) with unilateral scaphoid fractures from September 2009 to September 2011. All patients were followed-up two weeks post-surgery، every month for six months، and then every year after one year. Degree of fracture healing، measured level of pain using Visual Analog Scale (VAS)، range of motion، hand grip strength of affected limb vs. healthy limb، Quick DASH score (QD) and also Mayo Modified Wrist Score (MMWS) were recorded. In December 2012، all patients presented to the Orthopedic Clinic for their final follow-up visit where all data was recorded once more. Mean patient follow-up time was 24. 34 ± 8. 70 months (range: 11-34). Mean scaphoid fracture healing times for the HS and MP group were 14. 61 ± 3. 88 and 14. 39 ± 4. 27 weeks، respectively. No statistically significant difference was found between both groups after comparing mean levels of pain using VAS، ROM of wrist during flexion and extension، hand grip strength expressed as percentage of normal، QD، and MMWS. The level of patients'' content using VAS was 9. 5 for HS and 9. 0 for MP groups. The use of multiple pins for the internal fixation of scaphoid fractures proves to be a viable treatment option compared to Herbert Screws، due to decreased cost and increased availability.