|
|
| 11. |
Corrected sagittal tomography of the temporomandibular joint Influence of errors in film and patient positioning on linear and angular measurements |
| |
Acta Odontologica Scandinavica,
Volume 53,
Issue 4,
1995,
Page 264-269
PanmekiateSoontra,
PeterssonArne,
RohlinMadeleine,
ÅkermanSigvard,
ErikPer,
Preview
|
PDF (554KB)
|
|
摘要:
The aim of this study was to assess the variation in film and patient positioning in horizontally corrected sagittal tomography of the temporomandibular joint (TMJ). The influence of this variation on linear and angular measurements of some anatomic structures of the TMJ was also studied. There was no significant variation in film positioning in the tomograph, using a multi-film cassette. The variation in positioning the patient in the tomograph was significant when four dental assistants were asked to place the Frankfort plane parallel to the horizontal plane. The measurements with the film in a straight position were compared with the measurements with the film angulated, to simulate the mean variation in film and patient positioning. Linear and angular measurements of anatomic structures were performed in arthrotomograms of 58 joints, representing joints with superior disk position and joints with anterior disk position with and without reduction. There was a difference between the two measurements for four different distances and one angle independent of diagnosis. No differences could be found between patients belonging to the different diagnostic groups. The results indicate that variation in patient positioning influences linear and angular measurements of anatomic structures in TMJ arthrotomograms.
ISSN:0001-6357
DOI:10.3109/00016359509005984
出版商:Taylor&Francis
年代:1995
数据来源: Taylor
|
| 12. |
Photoelastic experiments on facings laminated to teeth |
| |
Acta Odontologica Scandinavica,
Volume 53,
Issue 4,
1995,
Page 270-274
TroedsonMichael,
DérandTore,
Preview
|
PDF (521KB)
|
|
摘要:
The influence of various cervical designs of laminated facings was investigated. A variation in the attachment between tooth and facing was also investigated, to examine the influence of partly bad adherence of the resin. The facings were incisally loaded at three different angulations. The study was made in a polariscope, using an Na light source and quarter wave plates. Lack of adhesion of the laminate incisally or cervically created a higher fringe order than when the middle part suffered from insufficient bonding. The shape of the cervical part had only a minor effect on the stress distribution in the facing.
ISSN:0001-6357
DOI:10.3109/00016359509005985
出版商:Taylor&Francis
年代:1995
数据来源: Taylor
|
|
首页
