OBJECTIVES: Conventional panoramic radiography (cPR) underlines procedure-related limitations in the display of objects. CBCT is presumed to overcome these constraints. To virtualize a cPR view, reformatted panoramic images (rPIs) can be generated. This study evaluated the rPI with regard to its susceptibility to sterical object deposition in comparison with cPR. METHODS: A specially developed implant model with dental implants each of 4.0-mm diameter and 11.0-mm length was depositioned by shift, rotation and tilt of 5.00 mm (±0.01 mm) of horizontal shift and 5.0° (±0.167°), respectively, on a highly precise goniometer rotation table, and cPRs and rPIs were generated. Automated evaluation of the cPRs was carried out using a specially developed software. rPIs were processed and analyzed by a semi-automated image analysis. RESULTS: Object deposition lead to distortive effects in the rPI analogue to cPR, but they appear in display only. Objects illustrated in the rPI were dimensionally correct, but sterical relations are elusive. Results are obtained for the horizontal shift, declination and reclination, lateral tilt and rotation. CONCLUSIONS: Distortions within the rPI represent the illustration of the hyperbolic-shaped layer out of the three-dimensional data set. With this study, we demonstrated these procedure-related inherent but practically underestimated consequences. Effects of sterical object malpositioning must be compensated by the observer by adequate virtual adjustment of the processed layer. Accurate virtual adjustment leads to vertical dimensions. Sterical relations, e.g. angulation of two objects, are irretraceable unless precisely referenced.
OBJECTIVES: Conventional panoramic radiography (cPR) underlines procedure-related limitations in the display of objects. CBCT is presumed to overcome these constraints. To virtualize a cPR view, reformatted panoramic images (rPIs) can be generated. This study evaluated the rPI with regard to its susceptibility to sterical object deposition in comparison with cPR. METHODS: A specially developed implant model with dental implants each of 4.0-mm diameter and 11.0-mm length was depositioned by shift, rotation and tilt of 5.00 mm (±0.01 mm) of horizontal shift and 5.0° (±0.167°), respectively, on a highly precise goniometer rotation table, and cPRs and rPIs were generated. Automated evaluation of the cPRs was carried out using a specially developed software. rPIs were processed and analyzed by a semi-automated image analysis. RESULTS: Object deposition lead to distortive effects in the rPI analogue to cPR, but they appear in display only. Objects illustrated in the rPI were dimensionally correct, but sterical relations are elusive. Results are obtained for the horizontal shift, declination and reclination, lateral tilt and rotation. CONCLUSIONS: Distortions within the rPI represent the illustration of the hyperbolic-shaped layer out of the three-dimensional data set. With this study, we demonstrated these procedure-related inherent but practically underestimated consequences. Effects of sterical object malpositioning must be compensated by the observer by adequate virtual adjustment of the processed layer. Accurate virtual adjustment leads to vertical dimensions. Sterical relations, e.g. angulation of two objects, are irretraceable unless precisely referenced.
Authors: P Pittayapat; D Galiti; Y Huang; K Dreesen; M Schreurs; P Couto Souza; I R F Rubira-Bullen; F H Westphalen; R Pauwels; G Kalema; G Willems; R Jacobs Journal: Clin Oral Investig Date: 2012-03-01 Impact factor: 3.573
Authors: Johannes Wikner; Henning Hanken; Christine Eulenburg; Max Heiland; Alexander Gröbe; Alexandre Thomas Assaf; Björn Riecke; Reinhard E Friedrich Journal: Acta Odontol Scand Date: 2015-05-02 Impact factor: 2.331
Authors: Leticia Ruhland Correa; Rubens Spin-Neto; Andreas Stavropoulos; Lars Schropp; Heloísa Emília Dias da Silveira; Ann Wenzel Journal: Clin Oral Implants Res Date: 2013-02-26 Impact factor: 5.977
Authors: Björn Riecke; Reinhard E Friedrich; Dirk Schulze; Clemens Loos; Marco Blessmann; Max Heiland; Johannes Wikner Journal: Clin Oral Investig Date: 2014-07-31 Impact factor: 3.573