Dataset Information

Geometric distortion of panoramic reconstruction in third molar tilting assessments: a comprehensive evaluation.

ABSTRACT: OBJECTIVES::To evaluate the geometric distortion of tilting of mandibular third molars with respect to second molars on panoramic reconstruction. METHODS::Cone-beam CT (CBCT) reconstructions of 160 third molars, obtained due to an indication of risk of inferior alveolar nerve damage during surgery, were used. CBCT-reconstructed panoramic images were used as bi-dimensional (2D) images, to avoid distortions other than geometric distortions. The angle between the second and the third molar was measured in 2D and three-dimensional (3D) images. Student's t-test was used to assess the null-hypothesis of no difference between 2D and 3D measurements. RESULTS::A significant mean difference (-2.3° ± 6.3°) between 2D and 3D measurements was found, with an absolute error of 3.6° ± 5.7° and a relative error of 10%. These findings comprehensively explain the geometric distortion on panoramic radiographs. CONCLUSIONS::Although a widely used and undoubtedly useful tool for diagnosis and surgical planning of mandibular third molar extractions, panoramic reconstruction are biased from geometric distortion that may influence surgical planning.

SUBMITTER: Lupi SM

PROVIDER: S-EPMC6196059 | biostudies-other | 2018 Oct

REPOSITORIES: biostudies-other

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Geometric distortion of panoramic reconstruction in third molar tilting assessments: a comprehensive evaluation.

Lupi Saturnino Marco SM Galinetto Pietro P Cislaghi Matteo M Rodriguez Y Baena Arianna A Scribante Andrea A Rodriguez Y Baena Ruggero R

Dento maxillo facial radiology 20180627 7

<h4>Objectives:</h4>To evaluate the geometric distortion of tilting of mandibular third molars with respect to second molars on panoramic reconstruction.<h4>Methods:</h4>Cone-beam CT (CBCT) reconstructions of 160 third molars, obtained due to an indication of risk of inferior alveolar nerve damage during surgery, were used. CBCT-reconstructed panoramic images were used as bi-dimensional (2D) images, to avoid distortions other than geometric distortions. The angle between the second and the third ...[more]

PMID: 29916727

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Project description:The extraction of impacted third molars is a common but potentially complication-prone oral surgical procedure. Wound healing plays a vital role in preventing complications. This scoping review aimed to assess the clinical and microbiological aspects of various suture materials and cyanoacrylates. Unlike existing studies, we included more articles and comprehensively compared suture materials. Articles published in languages other than English; duplicate studies; studies deemed irrelevant for the specific research questions, including those analyzing different supplementary treatments or not corresponding to the abstract's content; ex vivo or experimental animal studies; studies lacking approval from an ethics committee; and narrative reviews, systematic reviews, or systematic and meta-analysis reviews were excluded. Thus, only 17 studies, published between 2000 and 2023, were included in the search. Suture techniques varied among surgeons, with debates on primary and secondary closure methods. A comparison of different suture materials and their effects on wound healing, infection rates, and other factors was described. Cyanoacrylate has also been used as an alternative to traditional sutures. Microbiological analysis showed varying bacterial adhesion based on the suture material, with silk sutures retaining more microbes than PTFE sutures. Clinical assessments have revealed differing inflammatory responses that affect wound healing and complications. Cyanoacrylate has emerged as a promising alternative to traditional sutures, owing to its rapid polymerization and early healing. However, the choice of suture material in impacted third molar surgery remains controversial, considering microbiological factors and clinical outcomes. More extensive randomized clinical trials are required to better understand the effect of suture materials on surgical outcomes and potential improvements. This study could enhance the safety and effectiveness of this common oral surgical procedure.

Project description:BACKGROUND:The purpose of this study was to analyze the correlation between spatial resolution and ball distortion rate of panoramic radiography and to elucidate the minimum criterion for ball distortion rate, which is very relevant to clinical readability. METHODS:Horizontal and vertical spatial resolution and ball distortion rates were calculated in the same position, such as the incisor, premolar, molar, and temporomandibular joint area with various object depths corresponding to 48?mm. Three devices were evaluated. A region showing spatial resolution above the reference standard was selected, and the ball distortion rate corresponding to the same region was divided into horizontal and vertical phantom groups. The mean and standard deviation of the obtained ball distortion rates were calculated. Student's t-test was used to statistically analyze the mean difference in ball distortion rates between vertical and horizontal phantom groups. RESULTS:In all devices, the horizontal line pair phantom, but not the vertical line pair phantom, was readable in all areas measured at the line pair value of at least 1.88 lp/mm. The line pair value tended to be higher toward the center and lower toward the outside. The ball distortion rate tended to decrease closer to the center and increased further away. In addition, ball distortion rates could not be measured at some areas as they were not recognized as balls due to the high degree of distortion at the outermost and innermost sides. The number of balls satisfying the reference value using the horizontal line pair phantom was 102 (mean of ball distortion rates, 20.98; standard deviation, 15.25). The number of balls satisfying the reference value using the vertical line pair phantom was 49 (mean of ball distortion rates, 16.33; standard deviation, 14.25). However, mean ball distortion rate was not significantly different between the two groups. CONCLUSIONS:Image layer of panoramic radiography could be evaluated by the spatial resolution using horizontal and vertical line pair phantoms and by assessing ball distortion rates through a ball-type panorama phantom. A ball distortion rate of 20% could be used as a threshold to evaluate the image layer of panoramic radiography.

Dataset Information

Geometric distortion of panoramic reconstruction in third molar tilting assessments: a comprehensive evaluation.

Publications

Geometric distortion of panoramic reconstruction in third molar tilting assessments: a comprehensive evaluation.

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