4418387 Method of reconstructing a computed tomographic image from a single X-ray projection

ABSTRACT Objective: The aim of this study was to evaluate the skeletal and dental effects of rapid maxillary expansion (RME) in cleft patients using two types of expanders. Methods: Twenty unilateral cleft lip and palate patients were randomly divided into two groups, according to the type of expander used: (I) modified Hyrax and (II) inverted Mini-Hyrax. A pretreatment cone-beam computed tomographic image (T0) was taken as part of the initial orthodontic records and three months after RME, for bone graft planning (T1). Results: In general, there was no significant difference among groups (p > 0.05). Both showed a significant transverse maxillary expansion (p < 0.05) and no significant forward and/or downward movement of the maxilla (p > 0.05). There was greater dental crown than apical expansion. Maxillary posterior expansion tended to be larger than anterior opening (p < 0.05). Cleft and non-cleft sides were symmetrically expanded and there was no difference in dental tipping between both sides (p > 0.05). Conclusions: The appliances tested are effective in the transverse expansion of the maxilla. However, these appliances should be better indicated to cleft cases also presenting posterior transverse discrepancy, since there was greater expansion in the posterior maxillary region than in the anterior one.

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A Transymphyseal X-ray Projection to Assess the Anterior Edentulous Mandible Prior to Implant Placement

Dental Update ◽

10.12968/denu.2008.35.10.689 ◽

2008 ◽

Vol 35 (10) ◽

pp. 689-694 ◽

Cited By ~ 5

Author(s):

Andrew Shelley ◽

Keith Horner

Keyword(s):

X Ray ◽

Implant Placement ◽

Edentulous Mandible ◽

Ray Projection

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Soft x-ray projection lithography system design and cost analysis

10.1117/12.51272 ◽

1992 ◽

Author(s):

Natale M. Ceglio ◽

Andrew M. Hawryluk

Keyword(s):

Cost Analysis ◽

System Design ◽

X Ray ◽

Projection Lithography ◽

Ray Projection ◽

Lithography System

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Pigmented Villonodular Synovitis Causing Osteonecrosis of the Femoral Head: A Case Report

Case Reports in Orthopedics ◽

10.1155/2013/756954 ◽

2013 ◽

Vol 2013 ◽

pp. 1-4 ◽

Cited By ~ 1

Author(s):

Tomohiro Mimura ◽

Taku Kawasaki ◽

Keitaro Yagi ◽

Kanji Mori ◽

Shinji Imai ◽

...

Keyword(s):

Femoral Head ◽

English Language ◽

Three Dimensional ◽

Pigmented Villonodular Synovitis ◽

Villonodular Synovitis ◽

X Ray ◽

Bone Erosions ◽

Computed Tomographic ◽

Angiographic Image ◽

Pigmented Villonodular

We report a case of a 27-year-old man with pigmented villonodular synovitis of the hip joint with coincident osteonecrosis of the femoral head. According to our review of the English-language literature, no detailed report of osteonecrosis of the femoral head complicated with pigmented villonodular synovitis has been published. Preoperative X-ray images showed joint narrowing and severe multiple bone erosions at the acetabulum and femoral neck. Magnetic resonance imaging revealed a low-intensity band attributable to osteonecrosis of the femoral head and massive diffuse pigmented villonodular synovitis lesions. Comparison of a three-dimensional computed tomographic image of this patient with an angiographic image of a normal individual demonstrated proximity of the pigmented villonodular synovitis-induced bone erosions to the medial and lateral femoral circumflex arteries and retinacular arteries, suggesting likely the compromise of the latter by the former. We propose that the massive pigmented villonodular synovitis may have contributed to the pathogenesis of osteonecrosis of the femoral head in this patient. We performed open synovectomy and total hip arthroplasty. No operative complications occurred, and no recurrence of the pigmented villonodular synovitis was detected for 3 years after the operation.

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