Oral Radiology最新文献

{"title":"Monte Carlo simulations of organ and effective doses and dose-length product for dental cone-beam CT.","authors":"Shingo Terashima, Junta Sano, Minoru Osanai, Keisuke Toshima, Kentaro Ohuchi, Yoichiro Hosokawa","doi":"10.1007/s11282-023-00705-7","DOIUrl":"10.1007/s11282-023-00705-7","url":null,"abstract":"<p><strong>Objectives: </strong>The use of dental cone-beam CT (CBCT) has increased in recent years. We aimed to calculate the organ and effective doses in dental CBCT using Monte Carlo simulation (MCS) and to correlate the effective dose with the dose-length product (DLP), which is a radiation dose index.</p><p><strong>Methods: </strong>Organ and effective doses were calculated by MCS using the adult male and female reference phantoms of the International Commission on Radiological Protection publication 110 in a half-rotation scan of the CBCT scanner Veraviewepocs 3Df. The simulations were performed by setting nine protocols in combination with the field-of-view (FOV) and imaging region. In addition, DLPs were calculated by MCS using the virtual CT Dose Index (CTDI) and CBCT phantoms, with the same protocol.</p><p><strong>Results: </strong>The effective doses were 55 and 195 μSv at the minimum FOV of Φ40 × H40 mm and maximum FOV of Φ 80 × H80 mm, respectively. The organs with the major contribution to the effective dose were the red bone marrow (11.0‒12.8%), thyroid gland (4.0‒12.7%), salivary gland (21.8‒33.2%), and remaining tissues (35.1‒45.7%). Positive correlations were obtained between the effective dose and calculated DLP using the CTDI and CBCT phantoms.</p><p><strong>Conclusions: </strong>Organ and effective doses for each protocol of dental CBCT could be estimated using MCS. There was a positive correlation between the effective dose and DLP, suggesting that DLP can be used to estimate the effective dose of CBCT.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10018103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maxillary sinuses, multiple aspects to consider prior to bone grafting procedure: a retrospective study in a sample of a Palestinian population.","authors":"Mahmoud F Abu-Ta'a","doi":"10.1007/s11282-023-00702-w","DOIUrl":"10.1007/s11282-023-00702-w","url":null,"abstract":"<p><strong>Objectives: </strong>To analyze various anatomical aspects of the maxillary sinuses on CBCT volumes, mainly, the posterior superior alveolar artery (PSAA), and to compare its visibility on CBCT vs. panoramic radiographs.</p><p><strong>Material and methods: </strong>A retrospective radiographic analysis was conducted on 120 patients (240 maxillary sinuses) using their CBCT coronal views (CCV) and panoramic radiographs (CP). On CCV, the PSAA's maximum dimension (MD), vertical distance (PVD) to the alveolar crest, and bone plate thickness (T1 and T2) buccally and inferiorly to the PSAA, respectively, were analyzed. Additionally, on CCV, the ostium vertical distance (OVD) and location were recorded, and the height of the remaining bone height inferior to the maxillary sinuses (MVD) was also measured. The PSAA's visibility was evaluated and compared between CCV and CP. All these variables were studied at the apical region of the second maxillary premolar (P2), first molar (M1), and second molar (M2). Age, gender, and face side (right vs. left) factors affecting the sinus dimensions and visibility were investigated. Several statistical tests were used to analyze these variables.</p><p><strong>Results: </strong>PSAA was detected in 96.53% of the records on CCV, where it was significantly superior to CP in the detection of the PSAA structure (p value 0.000) at all sites analyzed. The PSAA's MD, PVD, T1 and T2 thicknesses, and MVD were on average 1.19 mm, 19.54 mm, 0.69 mm, 1.36 mm, and 10.25, respectively. OVD average was 31.04 mm where 42.9% of the ostia were within the mesiodistal extent of the second upper molar. No significant relation was found between different age groups, gender, and the visibility level of PSAA.</p><p><strong>Conclusion: </strong>Age, gender, and the side of the face investigated showed no discernible effects on the maxillary sinus's bone thickness, vertical dimensions, or PSAA diameter among the studied Palestinian sample. As CCV was superior to CP in the identification of PSSA, preoperative evaluation of PSSA using CBCT volumes is thus recommended.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9907801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of formula-based volume and image segmentation-based volume in calculation of preoperative cystic jaw lesions’ volume","authors":"Yasmein Maher El-beblawy, Ahmed Mohamed Bakry, Maha Eshaq Amer Mohamed","doi":"10.1007/s11282-023-00731-5","DOIUrl":"https://doi.org/10.1007/s11282-023-00731-5","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Objective</h3><p>The aim of this study was to assess the accuracy of formula-based volume measurements and the 3D volume analysis with different software packages in the calculation of preoperative cystic jaw lesions’ volume. The secondary aim was to assess the reliability and the accuracy of 3 imaging software programs for measuring the cystic jaw lesions' volume in CBCT images.</p><h3 data-test=\"abstract-sub-heading\">Materials and methods</h3><p>This study consisted of two parts: an in vitro part using 2 dry human mandibles that were used to create simulated osteolytic lesions to assess the accuracy of the volumetric analysis and formula-based volume. As a gold standard, the volume of each bone defect was determined by taking an impression using rapid soft silicone (Vinylight) and then quantifying the volume of the replica. Afterward, each tooth socket was scanned using a high-resolution CBCT. A retrospective part using archived CBCT radiographs that were taken from the database of the outpatient clinic of the oral and maxillofacial radiology department, Faculty of Dentistry, Minia University to assess the reliability of the 3 software packages. The volumetric data set was exported for volume quantification using the 3 software packages (MIMICS-OnDemand and InVesalius software). Also, the three greatest orthogonal diameters of the lesions were calculated, and the volume was assessed using the ellipsoid formula. Dunn’s test was used for pair-wise comparisons when Friedman’s test was significant. The inter-examiner agreement was assessed using Cronbach’s alpha reliability coefficient and intra-class correlation coefficient.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Regarding the results of the retrospective part, there was a statistically significant difference between volumetric measurements by equation and different software (<i>P</i> value &lt; 0.001, Effect size = 0.513). The inter-observer reliability of the measurements of the cystic lesions using the different software packages was very good. The highest inter-examiner agreement for volume measurement was found with InVesalius (Cronbach’s alpha = 0.992). On the other hand, there was a statistically significant difference between dry mandible volumetric measurements and Gold Standard. All software showed statistically significantly lower dry mandible volumetric measurements than the gold standard.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>Computer-aided assessment of cystic lesion volume using InVesalius, OnDemand, and MIMICS is a readily available, easy to use, non-invasive option. It confers an advantage over formula-based volume as it gives the exact morphology of the lesion so that potential problems can be detected before surgery. Volume analysis with InVesalius software was accurate in determining the volume of simulated periapical defects in a human cadaver mandible as compared to true volume. InVesalius software prove","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138743447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CT and MR imaging findings of head and neck chondrosarcoma","authors":"Yoon Joo Choi, Sang-Sun Han, Chena Lee, Kug Jin Jeon","doi":"10.1007/s11282-023-00729-z","DOIUrl":"https://doi.org/10.1007/s11282-023-00729-z","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Objectives</h3><p>This study investigated the imaging features of head and neck chondrosarcoma (HNCS) according to its origin and pathologic subtype.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>Patients who were pathologically diagnosed with HNCS between January 2000 and April 2022 were retrospectively reviewed. Lesions were classified based on their origin and pathologic subtype. The size and margin were evaluated on the image. Internal calcification and the effects on adjacent bone were assessed using computed tomography (CT) images, while signal intensity and contrast enhancement patterns were analyzed using magnetic resonance (MR) imaging.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Thirteen HNCSs were included in this study: 8 bone tumors (61.5%) and 5 soft tissue tumors (38.5%). The bone tumors were pathologically diagnosed as conventional (n = 5) and mesenchymal type (n = 3). Soft tissue tumors were defined as myxoid type. The main symptoms were swelling (90.9%) and pain (72.7%). The lesions measured 4.5 cm on average. The margins showed benign and well-defined except for the mesenchymal type. On CT, most bone tumors (75%) showed internal calcification with remodeling or destruction of the adjacent bone. No soft tissue tumors, except one case, showed internal calcification or destruction of the adjacent bone. MR imaging features were non-specific (T2 high signal intensity and contrast enhancement).</p><h3 data-test=\"abstract-sub-heading\">Conclusions</h3><p>HCNS showed various imaging findings according to their origin and pathologic subtype. HNCS should be differentiated if a bone tumor shows internal calcification and affects the adjacent bone. When diagnosing slow-growing soft tissue tumors, even if low possibility, HNCS should be considered.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138716699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiation doses of medical radiation workers performing low-dose-rate brachytherapy with 198Au grains and 192Ir pins for patients with oral cancers","authors":"","doi":"10.1007/s11282-023-00728-0","DOIUrl":"https://doi.org/10.1007/s11282-023-00728-0","url":null,"abstract":"<h3>Abstract</h3> <span> <h3>Objectives</h3> <p>Low-dose-rate brachytherapy (LDR-BT) with ¹⁹⁸Au grains and ¹⁹²Ir pins is an essential treatment option for oral cancer due to its high rate of local control and low invasiveness. However, the radiation exposure of medical radiation workers is concerning. Thus, we aimed to determine the radiation dose delivered to medical radiation workers during LDR-BT using ¹⁹⁸Au grains and ¹⁹²Ir pins for oral cancer.</p> </span> <span> <h3>Methods</h3> <p>Thirty-two patients with oral cancer underwent ¹⁹⁸Au grain interstitial LDR-BT between June 2016 and May 2023, and 23 patients with tongue cancer underwent ¹⁹²Ir pin interstitial LDR-BT between March 2015 and November 2017 at our hospital. Dosimetry was performed by attaching a dosimeter to the chest pocket of the operator and assistant during ¹⁹⁸Au grain or ¹⁹²Ir pin LDR-BT. Since the operator also loads ¹⁹⁸Au grains into the implantation device, the operator’s radiation dose includes the dose received during this preparation.</p> </span> <span> <h3>Results</h3> <p>Mean radiation doses of the operators with ¹⁹⁸Au grain and ¹⁹²Ir pin LDR-BT were 165.8 and 211.2 μSv, respectively. Statistically significant differences between the radioactive sources of ¹⁹⁸Au grain and ¹⁹²Ir pin LDR-BT were observed (<em>p</em> = 0.0459). The mean radiation doses of the assistants with ¹⁹⁸Au grain and ¹⁹²Ir pin LDR-BT were 92.0 and 162.0 μSv, respectively. Statistically significant differences were observed between the radioactive sources of ¹⁹⁸Au grains and ¹⁹²Ir pin LDR-BT (<em>p</em> = 0.0003).</p> </span> <span> <h3>Conclusions</h3> <p>Regarding radioactive source differences, ¹⁹²Ir pin LDR-BT resulted in higher doses delivered to medical radiation workers than ¹⁹⁸Au grain LDR-BT.</p> </span>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138716967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Incidental findings in cone beam computed tomography (CBCT) scans for implant treatment planning: a retrospective study of 404 CBCT scans","authors":"Philippe Biel, Alice Jurt, Vivianne Chappuis, Valerie G. A. Suter","doi":"10.1007/s11282-023-00723-5","DOIUrl":"https://doi.org/10.1007/s11282-023-00723-5","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Objectives</h3><p>To investigate the prevalence of incidental findings and need for further dental treatment and analyse the influence of size of field-of-view (FOV) and age in cone beam computed tomography (CBCT) for pre-implant planning.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>404 CBCT scans were examined retrospectively for incidental findings and need for further dental treatment. Incidental finding-frequencies and need for further treatment were assessed for different age (&lt; 40 years, 40–60 years, &gt; 60 years) and FOV groups (small, medium, large). Intraexaminer and interexaminer agreements were evaluated.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>In 82% of the scans at least one incidental finding was found, with a total of 766 overall. More incidental findings were found in scans with large FOV (98% vs. 72%, OR = 22.39 large vs. small FOV, <i>p</i> &lt; 0.0001) and in scans of patients &gt; 60 years (OR = 5.37 patient’s age &gt; 60 years vs. &lt; 40 years, <i>p</i> = 0.0003). Further dental treatment due to incidental findings was needed in 31%. Scans with large FOV were more likely to entail further treatment (OR = 3.55 large vs. small FOV, <i>p</i> &lt; 0.0001). Partial edentulism and large FOV were identified as risk factors for further treatment (<i>p</i> = 0.0003 and <i>p</i> &lt; 0.0001). Further referral of the patient based on incidental findings was judged as indicated in 5%. Intra- and inter-examiner agreements were excellent (kappa = 0.944/0.805).</p><h3 data-test=\"abstract-sub-heading\">Conclusions</h3><p>A considerable number of incidental findings with need for further dental treatment was found in partially edentulous patients and in patients &gt; 60 years. In pre-implant planning of elderly patients, the selection of large FOV CBCT scans, including dentoalveolar regions not X-rayed recently, help to detect therapeutically relevant incidental findings.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138693227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship between maxillary sinus mucosal cyst and sinus ostium 2D area in three-dimensional volumetric paranasal CT ımages","authors":"Ahmet Turan Kaya, Levent Uğur","doi":"10.1007/s11282-023-00722-6","DOIUrl":"https://doi.org/10.1007/s11282-023-00722-6","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Objective</h3><p>To investigate the relationship between the maxillary sinus ostium 2D area (SOA) and the development of mucosal cysts of the maxillary sinus (MMC).</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>Thirty patients (≥ 18 years) with unilateral MMC who underwent paranasal sinus CT (PNsCT) were included in this single-center retrospective study. Non-MMC sinus was used as the control group. Cyst and air volume of the maxillary sinuses, diameter, and 2-dimensional area of the ostium of the patients were calculated in the 3-dimensional volumetric analysis program. Both correlation and linear regression model analyses were performed for the relationship between MMC and SOA.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Thirty patients were included (mean age of 42.30 ± 17.62 years). A total of 15/30 (50%) were male. The mean SOA in patients with MMC (8.91 ± 1.10 mm²) was lower than in patients without MMC (12.94 ± 1.35 mm²), which was statistically significant (<i>p</i> &lt; 0.001). The mean sinus ostium diameter in patients with MMC (2.12 ± 0.71 mm) was higher than in patients without MMC (1.91 ± 0.82 mm), which was statistically insignificant (<i>p</i> = 0.295). There was a statistically significant, good level of negative linear correlation between SOA and total cyst volume (TCV) [correlation coefficient (<i>r</i>) = – 0.680, <i>p</i> &lt; 0.001]). As a result, the regression model consisting of \"Age, Sinus air volume, and TCV\" variables is a good model and has statistically significant relations with SOA.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>In conclusion, small SOAs contribute to the development of MMC. There was a negative correlation between SOA and TCV. In addition, 2D area measurement may be a more accurate method instead of diameter measurement.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138556046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic resonance imaging evaluation of the disc morphology of temporomandibular joint in patients with severe hemophilia.","authors":"Lays Assolini Pinheiro de Oliveira,&nbsp;João Pedro Perez Gomes,&nbsp;Luciana Ramalho Pimentel-Silva,&nbsp;Sérgio Lúcio Pereira de Castro Lopes,&nbsp;Maria Elvira Pizzigatti Correa,&nbsp;Adriana de Oliveira Lira,&nbsp;Andre Luiz Ferreira Costa","doi":"10.1007/s11282-023-00697-4","DOIUrl":"10.1007/s11282-023-00697-4","url":null,"abstract":"<p><strong>Objectives: </strong>This study aimed to assess the morphological differences in the articular disc (AD) between hemophilic patients and healthy individuals of the control group for further association with signs and symptoms.</p><p><strong>Methods: </strong>Fourteen severe hemophilic patients had their AD evaluated by magnetic resonance imaging (MRI). The morphological findings were compared to those of a control group consisting of 14 healthy individuals. MRI was used to evaluate all the components of the temporomandibular (TMJ), including the AD, resulting in sequential T1-weighted parasagittal images. All the images were acquired with teeth in maximum intercuspation position.</p><p><strong>Results: </strong>Morphological alterations showed significant statistical differences (P-value = 0.0068), whereas no statistical differences were found in the other variables, including TMJ pain, headache, bruxism and mouth opening limitation. In the group of non-hemophilic individuals, only two (14.29%) presented AD with non-biconcave features, whereas in the group of hemophilic patients, nine (64.29%) presented AD with a morphology other than biconcave.</p><p><strong>Conclusions: </strong>In patients with severe hemophilia, there seems to be a pattern of morphological alterations in the articular disc over time. The standard biconcave morphology of AD tends to change into other ones, particularly biplanar, hemiconvex and folded.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10282122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orofacial symptoms suggestive of malignant lesions and the role of imaging: literature review and case presentation.","authors":"Chieko Sugawara,&nbsp;Akira Takahashi","doi":"10.1007/s11282-023-00701-x","DOIUrl":"10.1007/s11282-023-00701-x","url":null,"abstract":"<p><p>Among the patients seeking dental treatment, some may present with symptoms that cannot be resolved by dental treatment alone. Patients with orofacial symptoms associated with malignant diseases, which require medical treatment, often visit dental clinics for their initial consultation. Delays in making a definitive diagnosis worsen the patient's prognosis. Therefore, dental clinicians should also be aware of the signs and symptoms associated with malignant diseases. The chief complaints of these patients include numb chin syndrome (NCS), painless swelling of the palate and neck, trismus and temporomandibular disorders, and an enlarged tongue. This article aimed to review these orofacial symptoms and related diseases and describe representative cases of these diseases to obtain a definitive diagnosis via imaging. Panoramic radiograph is widely used in general dentistry, and this article reaffirmed the importance of panoramic radiograph anatomical landmarks in diagnosing the cases presented in this paper.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10283566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The mandibular bone structure in children by fractal dimension and its correlation with pixel intensity values: a pilot study.","authors":"Beatriz Fernandes Arrepia,&nbsp;Thaiza Gonçalves Rocha,&nbsp;Annie Seabra Medeiros,&nbsp;Matheus Diniz Ferreira,&nbsp;Andrea Fonseca-Gonçalves,&nbsp;Maria Augusta Visconti","doi":"10.1007/s11282-023-00693-8","DOIUrl":"10.1007/s11282-023-00693-8","url":null,"abstract":"<p><strong>Objectives: </strong>To identify a normal pattern of mandibular trabecular bone in children based on the fractal dimension (FD), and its possible correlation with pixel intensity (PI) values, to facilitate the early diagnosis of possible diseases and/or future bone alterations.</p><p><strong>Materials and methods: </strong>The 50 panoramic images were selected and divided into two groups, according to the children's age: 8-9 (Group 1; n = 25) and 6-7 (Group 2; n = 25). For FD and PI analyses, three regions of interest (ROIs) were selected, and their mean values were evaluated for each ROI, according to each group, using the t test for independent samples and the model of generalized estimation equations (GEE). Subsequently, these mean values were correlated by the Pearson test.</p><p><strong>Results: </strong>Comparing the groups, FD and PI did not differ from each other for any of the measured regions (p > 0.00). It was observed that in the mandible branch (ROI1), FD and PI means were 1.26 ± 0.01 and 81.0 ± 2.50, respectively. In the mandible angle (ROI2), the means were 1.21 ± 0.02 (FD) and 72.8 ± 2.13 (PI); and in the mandible, cortical (ROI3) values of FD = 1.03 ± 0.01 and PI = 91.3 ± 1.75 were obtained. There was no correlation between FD and PI in any of the analyzed ROI (r < 0.285). The FD means of ROI1 and ROI2 did not differ from each other (p = 0.053), but both were different from ROI3 (p < 0.00). All PI values differed from each other (p < 0.00).</p><p><strong>Conclusion: </strong>The bone trabeculate pattern in 6-9-year-old children presented FD between 1.01 and 1.29. Besides that, there was no significant correlation between FD and PI.</p>","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10645439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}