# A methodological approach to standardize and control the quality of the position and alignment of lamina implants on two-dimensional radiographs.

A methodological approach to standardize and control the quality of the position and alignment of lamina implants on two-dimensional radiographs.,

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**A methodological approach to standardize and control the quality of the position and alignment of lamina implants on two-dimensional radiographs.**

Oral Radiol. 2019 Feb 04;:

Authors: Menchini-Fabris GB, Covani U, Toti P, Marconcini S, Barone A, Martuscelli R

Abstract

OBJECTIVES: We sought to validate a new method to detect the degree of correlation between simulated and real tilted blade implants as they appear on a single two-dimensional radiograph.

METHODS: The angular correction factor (CF^) was defined as the coupling of two subsequent angle transformations, a set of five angular values describing the theoretical radiographic appearance of the blade implant: (1) three consecutive rotations about the axes of the blade ([Formula: see text], θ, and ψ, standing for pitch, roll, and yaw, respectively) to represent the polarization directions; (2) a two-dimensional projection defined by two angles (λ and [Formula: see text], respectively, longitude and latitude) to represent the vector of the X-ray beam intersecting the detector plate. Data of patients who received fixed prostheses supported by blade-form implants were employed to calculate a dimensional correction factor (CF°), a specific length through the major axis. The simulation of a distorted radiograph of a blade positioned in space was compared with the real radiograph. Differences in the angular measurements served as an initial test to assess the effectiveness of the method.

RESULTS: In the acquired sets of periapical radiographs, mean misalignments of + 3.58° in longitude and - 0.04° in latitude were registered. The following variations were detected during the accuracy testing: the absolute error was 0.1 ± 7.5° for angle [Formula: see text]; 2.4 ± 6.7° for angle θ; - 1.0 ± 3.7° for angle ψ; 4.5 ± 8.6° for angle λ; and 2.0 ± 9.3° for angle [Formula: see text]. The linear dependence between CF° and CF^ was estimated by a robust linear regression: slope + 0.991, intercept + 0.007, and adjusted R2 0.992.

CONCLUSIONS: This a posteriori analysis introduces the explicit trigonometric equations of the theoretical standard (CF^) used to describe the blade implant radiographic position and misalignment on two-dimensional radiographs.

PMID: 30715653 [PubMed – as supplied by publisher]

,

Related Articles |

**A methodological approach to standardize and control the quality of the position and alignment of lamina implants on two-dimensional radiographs.**

Oral Radiol. 2019 Feb 04;:

Authors: Menchini-Fabris GB, Covani U, Toti P, Marconcini S, Barone A, Martuscelli R

Abstract

OBJECTIVES: We sought to validate a new method to detect the degree of correlation between simulated and real tilted blade implants as they appear on a single two-dimensional radiograph.

METHODS: The angular correction factor (CF^) was defined as the coupling of two subsequent angle transformations, a set of five angular values describing the theoretical radiographic appearance of the blade implant: (1) three consecutive rotations about the axes of the blade ([Formula: see text], θ, and ψ, standing for pitch, roll, and yaw, respectively) to represent the polarization directions; (2) a two-dimensional projection defined by two angles (λ and [Formula: see text], respectively, longitude and latitude) to represent the vector of the X-ray beam intersecting the detector plate. Data of patients who received fixed prostheses supported by blade-form implants were employed to calculate a dimensional correction factor (CF°), a specific length through the major axis. The simulation of a distorted radiograph of a blade positioned in space was compared with the real radiograph. Differences in the angular measurements served as an initial test to assess the effectiveness of the method.

RESULTS: In the acquired sets of periapical radiographs, mean misalignments of + 3.58° in longitude and - 0.04° in latitude were registered. The following variations were detected during the accuracy testing: the absolute error was 0.1 ± 7.5° for angle [Formula: see text]; 2.4 ± 6.7° for angle θ; - 1.0 ± 3.7° for angle ψ; 4.5 ± 8.6° for angle λ; and 2.0 ± 9.3° for angle [Formula: see text]. The linear dependence between CF° and CF^ was estimated by a robust linear regression: slope + 0.991, intercept + 0.007, and adjusted R2 0.992.

CONCLUSIONS: This a posteriori analysis introduces the explicit trigonometric equations of the theoretical standard (CF^) used to describe the blade implant radiographic position and misalignment on two-dimensional radiographs.

PMID: 30715653 [PubMed – as supplied by publisher]

, , , {authorlink}, https://www.ncbi.nlm.nih.gov/pubmed/30715653?dopt=Abstract, https://eutils.ncbi.nlm.nih.gov/entrez/eutils/erss.cgi?rss_guid=1T1hTO9Bp3LWOp_6eJ_pZJ6tHN3wivSChLuYwfdhqY5dK-OgTe, pubmed: istituto_stomatologi…,

, https://www.ncbi.nlm.nih.gov/entrez/query/static/gifs/iconsml.gif, PubMed, 14845, 6 Febbraio 2019, 6:02

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