Yasin Yasa

Comparative cone-beam computed tomography evaluation of the osseous morphology of the temporomandibular joint in temporomandibular dysfunction patients and asymptomatic individuals

ObjectiveWe examined the bone components of the temporomandibular joint (TMJ) in asymptomatic individuals and patients with temporomandibular dysfunction (TMD) using cone-beam computed tomography (CBCT).MethodsTwo hundred asymptomatic individuals and 200 patients with TMD were included in this study. Condyle position, eminence height, eminence inclination, condyle shape, and fossa shape were assessed on CBCT images of the 800 temporomandibular joints.ResultsThe eminence inclination (P < 0.05), eminence height (P < 0.0001), mediolateral width of condyle (P < 0.0001), and anterior joint space (P < 0.0001) were significantly greater in male subjects compared with female subjects in both the asymptomatic group and TMD group. Comparisons of the asymptomatic group and TMD group revealed significant differences in the anterior joint space (P < 0.0001), ratio of anterior joint space to posterior joint space (P < 0.001), posterior joint space (P < 0.05), eminence inclination (P < 0.05), eminence height (P < 0.05), condyle shape (P < 0.0001), and fossa shape (P < 0.05).ConclusionsThe present analyses suggest that a steeper articular eminence inclination may be risk factor for TMD. The presence of TMD was associated with the condyle position in the TMJ.

Morphometric Analysis of Sella Turcica Using Cone Beam Computed Tomography.

Objective: The purpose of this study was to assess morphological shape and morphometric analysis of the sella turcica using cone beam computed tomography (CBCT) in different planes of section (coronal and sagittal). Materials and Methods: CBCT images of 177 subjects of which 51 males and 126 females in the age group of 11 to 73 years were included in the study population. Linear dimensions which include the length, depth, diameter, and interclinoid distance were measured and the shape of sella turcica was analyzed. Results: Sella turcica had circular morphology in 69.5% of the subjects while flattened shape of sella turcica was observed in 16.4%, oval shape of sella turcica in 14%. There was no significant difference in the all measurements of sella turcica between males and females (P > 0.05). Diameter (P < 0.01), depth (P < 0.001), length (P < 0.05), and interclinoid distance (P < 0.05) of the sella turcica differed significantly with age. Conclusions: The anatomical structure of sella turcica can be studied effectively in CBCT images. Linear dimensions and shape of sella turcica in the current study can be used as reference standards for further investigations.

Cone beam computed tomography imaging of superior semicircular canal morphology: a retrospective comparison of cleft lip/palate patients and normal controls

Abstract Objective: This study evaluated the prevalence and morphological characteristics of the superior semicircular canal (SSCC) in cleft lip and palate (CL/P) patients using cone beam computed tomography (CBCT). Materials and methods: CBCT images of 53 CL/P patients (28 males and 25 females) and a control group of 76 patients (42 males and 34 females) were evaluated. Retrospectively, 258 temporal bone images from 129 patients were evaluated in terms of SSCC morphology and divided into a normal pattern (0.6–1.7 mm in thickness), a papyraceous pattern (<0.5 mm), a thick pattern (>1.8 mm), a pneumatized pattern and dehiscent. The chi-squared test was used to compare differences among semicircular canal dehiscence (SSCD) patterns in the CL/P and control groups; p ≤ .05 was taken to reflect statistical significance. Results: The characteristics of the SSCC were evaluated on CBCT images in patients with CL/P and controls. In total, 158 (61%) cases were normal (0.6–1.7 mm in thickness), 31 (12%) papyraceous (<0.5 mm), 8 (3%) thick, and 34 (13%) pneumatized. SSCD was observed in 27 (11%) cases. Statistically significant differences between the CL/P and control groups were evident in terms of SSCC morphology (p < .001). Conclusions: SSCD should be considered if a CL/P patient exhibits a vestibular system deficiency. Oral and maxillofacial radiologists should pay attention to SSCD when interpreting CBCT images. Future studies should use high-level spatial resolution CBCT to focus on cleft site and SSCC morphology in larger patient populations.

Late Side Effects of Chemotherapy and Radiotherapy Taken in Early Childhood on The Teeth: Two Case Reports

1Akdeniz University Faculty of Dentistry, Department of Oral and Maxillofacial Radiology, Antalya, Turkey 2Eskişehir Osmangazi University Faculty of Dentistry, Department of Oral and Maxillofacial Radiology, Eskişehir, Turkey 3Abant İzzet Baysal University Faculty of Dentistry, Department of Oral and Maxillofacial Radiology, Bolu, Turkey 4Ordu University Faculty of Dentistry, Department of Oral and Maxillofacial Radiology, Ordu, Turkey Sevcihan Günen Yılmaz1, İbrahim Şevki Bayrakdar2, Seval Bayrak3, Yasin Yaşa4 Erken Çocukluk Döneminde Alınan Radyoterapi ve Kemoterapinin Dişler Üzerine Geç Dönem Etkileri: İki Olgu Sunumu Late Side Effects of Chemotherapy and Radiotherapy in Early Childhood on the Teeth: Two Case Reports

Evaluation of Sella Turcica Shape and Dimensions in Cleft Subjects using Cone Beam Computed Tomography.

Objective: The aim of this study was to assess the morphology of the sella turcica and measure its size in cleft and noncleft subjects. Material and Methods: Cone-beam computed tomography (CBCT) images of 54 individuals (29 males; 25 females) with cleft and 85 (22 males; 63 females) without cleft were used for this study. Syndromic patients with cleft(s) were not included because of possible additional endocrinological and/or morphological disorders. Linear measurements included length, depth, and diameter. The shape of the sella turcica was analyzed in the cleft and noncleft groups. An independent t test was conducted to evaluate differences between genders and groups. One-way ANOVA was used to compare age groups. Results: The length (p < 0.001) of the sella turcica was smaller in noncleft subjects than in cleft subjects. Diameter (p = 0.014) and depth (p = 0.005) showed as constantly increasing from an age <15 to >25 years in the overall assessment. The distribution of the shape of the sella turcica differed significantly between groups (p < 0.001). Conclusions: In this study, CBCT was used to assess the morphology of the sella turcica. A majority of the subjects with cleft had a flattened sella turcica compared to that of the control group. A shorter length of the sella turcica was more evident in the cleft subjects than in the control group.

Morphological assessment of palatal rugae pattern in a Turkish subpopulation

Abstract The objective of this study was to demonstrate the palatal rugae patterns in a sample Turkish subpopulation. Orthodontic dental casts of 126 patients (66 females and 60 males, 10–22 years old) were analyzed for rugae characteristics. Palatal rugae pattern and number, direction of rugae alignment and shape of incisive papilla were noted. Modified Thomas and Kotze classification was performed to analyze palatal rugae shape patterns. The data were analyzed using Mann Whitney U and Pearson’s chi-square tests. The most common rugae shape in the Turkish subpopulation was wavy types (44.2%) of rugae palatina, whereas straight (9.4%) and annular (2.5%) types were the least common. There was a significant difference between sexes for right primary rugae shape (P < 0.05). The mean number of primary and secondary rugae between sexes did not differ significantly (P > 0.05). The most common direction of palatal rugae alignment was horizontal, and droplet shape was the most common type of incisive papilla. All palatal rugae patterns were unique for each subject. The palatal rugae pattern can probably be used as an additional indicator for sex determination and human identification in forensic sciences.