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    A comparison of the use of cone-beam computed tomography and panoramic radiography in the assessment of pre-eruptive intracoronal resorption
    (Taylor & Francis Ltd, 2016) Demirtas, Omer; Dane, Asim; Yildirim, Eren
    Objective: This study aimed to investigate the prevalence of pre-eruptive intracoronal resorption (PIR) using cone beam computed tomography (CBCT) and panoramic radiography and to compare the findings of these imaging techniques.Methods: This retrospective study consisted of 733 patients who had at least one unerupted tooth and had undergoneimaging with both three-dimensional (3D) CBCT and two-dimensional (2D) panoramic radiography. In all the images, the number of teeth with intracoronal resorption, affected tooth type and number, and size and location of the PIR defects were recorded. The McNemar test was used to compare the prevalence of PIR in the CBCT and panoramic images.Results: Fewer PIR defects were detected in the panoramic images (3.1% of the patients) than in the CBCT images (9.5% of the patients) (p<.001). According to the CBCT images, the distribution of PIR defects was as follows: third molars (59.5%), canine teeth (11.4%), second molars and premolars (7.6% for both), supernumerary teeth (5.1%), second molars (3.8%), central incisors (2.5%), and first premolar and primary second molar teeth (1.5% for both). According to the scoring classification system for PIR defects, PIR 1 defects were the most common (65.8%), followed by PIR 3 (24.1%) and PIR 2 (10.1%). Of these defects, 69.6% were located in the central aspect of the crown. Ectopically positioned teeth showing intracoronal resorption accounted for 51.9% of the cases of PIR.Conclusions: CBCT detected more cases of PIR than panoramic radiography. The mandibular third permanent molar was the most commonly affected tooth.
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    The distribution of cervical vertebrae anomalies among dental malocclusions
    (Wolters Kluwer Medknow Publications, 2015) Kamak, Hasan; Yildirim, Eren
    Aims: The aims of our study were to investigate the distribution of cervical vertebrae anomalies (CVAs) among dental Angle Class I, II, and III malocclusions in Turkish population and whether a correlation between CVA and dental malocclusion. Materials and Methods: The study was performed on lateral cephalometric radiographs which were taken at the Department of Orthodontics, Faculty of Dentistry, Kirikkale University. The final sample of 318 orthodontic patients was included in the study. Dental malocclusions were performed according to Angle classification. CVAs were categorized: (1) fusion and (2) posterior arch deficiency (PAD). The Chi-square test was used to the analysis of the potential differences among dental malocclusions. Results: The final sample of 318 patients was examined. CVA was observed in 42 individuals (of 26 [8.17%] had fusion and 16 [5.03%] had PAD), with a frequency of 13.2%. Of the 26 fusion defect, 8 (30.7%) had Angle Class I, 8 (30.7%) had Angle Class II, and 10 (38.4%) had Angle Class III malocclusion. Of the 16 PAD, 8 (50%) had Angle Class I, 8 (50%) had Angle Class II but no patients with Angle Class III malocclusion was observed. The distribution of dental malocclusions regarding CVA was not statistically significant (P = 0.076). Of these 42 individuals with CVA, 52.3% (15 fusions and 7 PAD) were females and 47.7% (11 fusions and 9 PAD) were males. Conclusion: In our study, the prevalence of fusion and PAD were found 8.1% and 5.0% in Turkish population, respectively. Besides, no statistically significant correlation between CVA and Angle Class I, II, and III malocclusions were found. Our findings support the studies showing no gender dimorphism.
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    Evaluation of the relationship between maxillary sinus floor position and maxillary sinusitis using cone beam computed tomography
    (Springer, 2017) Yildirim, Eren; Ciftci, Mehmet Ertugrul; Kamak, Gulen; Aktan, Ali Murat
    The aim of this study was to evaluate the effect of the relationship between the horizontal position of the maxillary sinus floor and the tooth roots on maxillary sinus pathologies using cone beam computed tomography. The patients' age, sex, presence or absence of apical abscesses, and horizontal relationship between the maxillary sinuses and tooth roots were recorded. In total, 228 maxillary sinuses of 114 patients were divided into case and control groups according to whether pathology was present. The horizontal relationship between the tooth roots and the lower wall of the maxillary sinus was categorized into three types. The variables were analyzed using the Chi-square test. Of 42 apical abscesses, 13 (31 %) were present in the control group and 29 (69 %) were present in the case group. This difference was statistically significant (p = 0.003). Each of the 228 maxillary sinuses was classified according to its horizontal relationship to the tooth root. The most frequently seen relationship was Type II, followed by Type I and III, respectively. Although the control and case groups showed equilibrium in the distribution of Type II and III relationships, maxillary sinus pathologies were significantly less common in Type I (p < 0.001). This study shows that positioning of the maxillary sinus toward the buccal side (Type I) poses an obstacle to the spread of odontogenic infection to the sinus and that the presence of apical abscesses is correlated with maxillary sinusitis.
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    Relationship between CBCT and panoramic images of the morphology and angulation of the posterior mandibular jaw bone
    (Springer France, 2016) Ciftci, Mehmet Ertugrul; Aktan, Ali Murat; Isman, Ozlem; Yildirim, Eren
    We determined actual bucco-lingual angulation values and morphological variations of residual bone in the mandibular posterior edentulous region using cone-beam computed tomography (CBCT) and panoramic radiography. A second aim was to investigate whether it was possible to predict bone morphology from panoramic radiographs. Data were collected from 77 consecutive patients referred for both CBCT and panoramic radiography in our department. Two-dimensional and three-dimensional images of the probable implant placement region were investigated. The bucco-lingual angulation values and crest type were determined directly from the cross-sectional images of the posterior edentulous region. The edentulous region was divided into three groups: second premolar, first molar, or second molar region. The observations were evaluated by the computer software, SPSS 22.0 (SPSS Inc. Chicago, USA). The crest type was classified into three groups: type U, type C, or type P. Kappa statistics, Kolmogorov-Smirnov tests, ANOVA, and Kruskal-Wallis tests were used in statistical analyses. The significance level was set at p < 0.05. Type C was more frequent in the second premolar region and the crest type had changed to type U in the second molar region. The predictability of the type U was highest in the second molar region. Moderate agreement was found in the predictability of type U in the molars (kappa = 0.602). The mean value of bucco-lingual angulation was highest in the second molar region, followed by the first molar region. There were statistically significant differences between the bucco-lingual angulation of the crest types in the second premolar and first molar regions (p < 0.05). Bucco-lingual angulation values and morphology change through the posterior mandible. Type U was predicted at a higher rate in the second molar region from panoramic radiographs. These results demonstrate predicting high-risk areas in the posterior mandible for implant therapy from panoramic radiography.