A new aperture plane method of measuring antenna surface errors

1994 ◽  
Vol 42 (1) ◽  
pp. 116-119
Author(s):  
T.H. Legg
Keyword(s):  
Plane Method ◽  
Surface Errors ◽  
Antenna Surface ◽  
Measuring Antenna

scholarly journals Accuracy of intraoral scan images in full arch with orthodontic brackets: a retrospective in vivo study

2021 ◽  
Author(s):  
Young-Kyun Kim ◽  
So-Hyun Kim ◽  
Tae-Hyun Choi ◽  
Edwin H. Yen ◽  
Bingshuang Zou ◽  
...  
Keyword(s):  
Orthodontic Brackets ◽  
Digital Impression ◽  
Orthodontic Bracket ◽  
Average Surface ◽  
Mandibular Arch ◽  
Surface Errors ◽  
Digital Impressions ◽  
Surface Deviations ◽  
Orthodontic Patients

Abstract Objectives The purpose of this retrospective study was to evaluate the accuracy of intraoral scan (IOS) images in the maxillary and mandibular arches with orthodontic brackets. Material and methods From digital impressions of 140 patients who underwent orthodontic treatment, consecutive IOS images were selected based on standardized inclusion criteria: Two pre-orthodontic IOS images (IOS1 and IOS2) of permanent dentition with fully erupted second molars and IOS images obtained immediately after orthodontic bracket bonding (IOSb). Superimpositions were performed to evaluate the reproducibility of repeated IOS images. Accuracy of IOSb images was analyzed by comparing the average surface errors between IOS1c and IOS2c images, which were IOS images cut based on the same region of the interest as between IOS1 and IOSb images. Results A total of 84 IOS images was analyzed. The average surface errors between IOS1 and IOS2 images were 57 ± 8 μm and 59 ± 14 μm in the maxillary and mandibular arch, respectively, and their reliability was almost perfect. The average errors between IOSb and IOS1c images exhibited an increase, which measured 97 ± 28 μm in the maxillary arch and 95 ± 29 μm in the mandibular arch. These surface deviations between IOSb and IOS1c images were significantly larger in each region as well as entire dentition (P < 0.001) compared to those between IOS1c and IOS2c images. Conclusions The average surface errors of the scans with brackets showed increased values compared with those without brackets. This suggests that orthodontic brackets could affect the trueness of intraoral scan images. Clinical relevance It is necessary for clinicians to consider the effect of brackets on digital impression when using IOS images in orthodontic patients.

The Second-order Imaginary Plane Method and its calculation accuracy

1997 ◽  
Vol 6 (2) ◽  
pp. 123-127
Author(s):  
Peng Dong ◽  
Xiaodong Chen ◽  
Tong Zhu ◽  
Yukun Qin
Keyword(s):  
Second Order ◽  
Plane Method ◽  
Imaginary Plane

Multiple Cuts in the Analytic Center Cutting Plane Method

2000 ◽  
Vol 11 (1) ◽  
pp. 266-288 ◽  
Author(s):  
Jean-Louis Goffin ◽  
Jean-Philippe Vial
Keyword(s):  
Cutting Plane ◽  
Cutting Plane Method ◽  
Analytic Center ◽  
Plane Method
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