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   2020| September-December  | Volume 8 | Issue 3  
    Online since February 26, 2021

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Diagnosis of vertical root fractures using cone-beam computed tomography
Fumi Mizuhashi, Ichiro Ogura, Yoshihiro Sugawara, Makoto Oohashi, Ryo Mizuhashi, Hisato Saegusa
September-December 2020, 8(3):56-61
Background/Aim: The aim of this study was to investigate the occurrence of vertical root fracture using cone-beam computed tomography (CBCT). Methods: We reviewed the CBCT images of 41 patients who were examined and verified vertical root fracture. The characteristics of root fractures (pulpal vitality, existence of injury, kind of tooth, and core construction) that were considered to influence the occurrence of root fracture were investigated. The position of the tooth and the fracture direction were also examined. Diagnostic propriety of root fractures between intraoral radiography and CBCT was examined. Statistical analyses of each characteristic and the fracture direction were performed by Chi-squared test. The position of the tooth and diagnostic propriety were analyzed by cross-tabulation. Results: The number of vertical root fracture was larger at nonvital tooth (P < 0.001) and larger on nontraumatized tooth (P < 0.001). There was not statistically significant difference among metal core, composite resin core, and no core to the occurrence of vertical root fracture. The number of vertical root fracture was largest on the premolar teeth (P = 0.022), and the anterior teeth fracture was larger on the upper teeth (P = 0.003). On the premolar teeth, the frequency of buccolingual fracture was larger than that of mesiodistal fracture (P = 0.033). The vertical root fracture that was diagnosable by CBCT was larger in comparison to that by intraoral radiography (P < 0.001). Conclusions: These results suggested that vertical root fracture easy to occur on nonvital tooth, nontraumatized tooth, and premolar tooth, and diagnosable using CBCT.
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Key factors for a successful surgical guide: A prospective pilot study
Rami Abou Khalil, Nabil Ghosn, Nadim Mokbel, Carole Chakar, Nada Naaman
September-December 2020, 8(3):47-55
Aims: The aim of this prospective pilot study was to assess the effect of the variation factors starting from the impression technique to the surgery itself in the accuracy of the dental-supported stereolithographic surgical template in implant surgery. Methods and Materials: Eighteen tapered bone level Straumann implants were inserted in 12 partially edentulous patients. The pre- and post-operative cone-beam computed tomography scans were matched allowing comparison of the planned implants with the inserted ones, considering the coronal, apical, and the angular deviation values, according to different surgeons and different implant length. Results: A mean coronal variation of 1.15 ± 0.616 mm, an apical variation of 1.43 ± 0.77, mm and the angular variation of 2.90 ± 1.41were shown. These deviations were within the range reported by several systematic reviews with lower standard deviation from the mean values. Conclusion: Within the limitations of this study, the control of the variation key factors shows better results in guided surgery and with a higher consistency in the results even with different operators.
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Labio-chin hypoesthesia revealing Parry–Romberg syndrome
Manel Gharbi, Imen Chaabani, Mohamed Ben Khelifa, Touhami Ben Alaya
September-December 2020, 8(3):66-70
Parry–Romberg syndrome (PRS) is a rare condition that still having no clear etiology. It is marked by a progressive hemifacial atrophy (PHA) of the muscular, bony, glandular, and fat tissues. Such manifestations are especially present in the lower third of the face. It causes important esthetic problems together with functional and psychological issues due to facial asymmetry. The present case report involves a 33-year-old woman with PHA that started at the age of 12. Despite the evident involvement of the left side tissues and the early age of onset, she had neither sight changes nor dental malformations. PRS is a rare disorder causing PHA that could be misdiagnosed as linear scleroderma. It affects the patient's life quality on various levels. Hence, further studies and a multidisciplinary approach are necessary to determine the exact etiology and to establish precise guidelines for the treatment planning.
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Analysis of tongue squamous cell carcinoma with Doppler sonography and strain elastography using intraoral ultrasonography
Yoshihiro Sugawara, Yoshiyuki Minami, Junya Ono, Yasuo Okada, Ichiro Ogura
September-December 2020, 8(3):62-65
Background: Depth of invasion (DOI) in oral carcinoma has been integrated into the primary tumor categories in the current tumor-node metastasis staging, and intraoral ultrasonography provides sufficient accuracy for the measurement of tumor DOI in oral tongue carcinoma. Aims: The objectives of this study were to analyze the tongue squamous cell carcinoma (SCC) with Doppler sonography and strain elastography using intraoral ultrasonography. Materials and Methods: Six patients with tongue SCC who underwent Doppler sonography and strain elastography using intraoral ultrasonography were prospectively included. Doppler sonography and strain elastography using intraoral ultrasonography were obtained with a linear 14 MHz transducer using our protocol. The tumor thickness using ultrasonography and tumor with/without vascular signals were evaluated by the Mann–Whitney U-test. The relationship between tumor thickness using ultrasonography and pathological tumor thickness and DOI was assessed by the Pearson's rank correlation test. P values lower than 0.05 indicate statistically significant differences. Results: The tumor thickness using ultrasonography in the vascular signal's presence group (5.8 ± 1.4 mm) was larger than that of the absence group (3.1 ± 1.5 mm, P = 0.050). The strain values of tumor and control in the tongue SCC were 0% and 0.534% ± 0.236%, respectively. Tumor thickness using ultrasonography was correlated with pathological tumor thickness (r = 0.811, P = 0.050) and pathological DOI (r = 0.599, P = 0.209), respectively. Conclusions: Doppler sonography and strain elastography using intraoral ultrasonography are useful for the analysis of tongue SCC.
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