Ömer Said Sezgin

An in vitro comparison of diagnostic abilities of conventional radiography, storage phosphor, and cone beam computed tomography to determine occlusal and approximal caries

AIM The aim of this study was to compare conventional radiography, storage phosphor plate, and cone beam computed tomography for in vitro determination of occlusal and approximal caries. METHODS A total of 72 extracted human premolar and molar teeth were selected. Teeth were radiographed with conventional intraoral radiography, a storage phosphor plate system, and cone beam computed tomography and evaluated by two observers. The teeth were then separated and examined with a stereomicroscope and a scanner at approximately 8×magnification. RESULTS CBCT was statistically superior to conventional radiography and phosphor plate for determining occlusal caries. No significant difference from CBCT, conventional radiography and the phosphor plate system for determining approximal caries was found. CONCLUSION The CBCT system may be used as an auxiliary method for the detection of caries.

Conventional frontal radiographs compared with frontal radiographs obtained from cone beam computed tomography.

AIM To test the hypothesis that there is no difference between measurements performed on conventional frontal radiographs (FRs) and those performed on FRs obtained from cone beam computed tomography (CBCT) scans. MATERIALS AND METHODS This study consisted of conventional FRs and CBCT-constructed FRs obtained from 30 young adult patients. Twenty-three landmarks were identified on both types of cephalometric radiographs. Twenty-one widely used cephalometric variables (14 linear distances, 4 angles, and 3 ratios) were calculated. Paired t-tests were performed to compare the means of corresponding measurements on two cephalometric radiographs of the same patient. RESULTS Reproducibility of measurements ranged from 0.85 to 0.99 for CBCT-constructed FRs, and from 0.78 to 0.96 for conventional FRs. A statistically significant difference was observed between conventional FRs and CBCT-constructed FRs for all linear measurements (eurR-eurL, loR-loL, moR-moL, zygR-zygL, lapR-lapL, mxR-mxL, maR-maL, umR-umL, lmR-lmL, agR-agL, me-ans) (P < .05), except for the ans-cr measurement (P > .05). However, no statistically significant differences were noted between conventional FRs and CBCT-constructed FRs for ratios and angular measurements (P > .05). CONCLUSIONS The hypothesis was rejected. A difference has been noted between measurements performed on conventional FRs and those performed on CBCT-constructed FRs, particularly in terms of linear measurements.

Trifid mandibular condyle

Bifid and trifid condyles are rare disorders of the mandible. Their etiology and pathogenesis are unclear. They can be associated with temporomandibular joint disorders or can be diagnosed incidentally on routine radiographic examination. This article presents a case of trifidism of the right mandibular condylar head of a 31-year-old woman with a history of childhood trauma to the head and neck. The patient was asymptomatic. The abnormal formation of the condyle was diagnosed incidentally on a panoramic radiograph and was evaluated using cone-beam computed tomography.

Unusual teeth transpositions: two case reports

Tooth transposition is a rare dental anomaly that is characterized by the interchanged position of two adjacent permanent teeth in the same quadrant or ectopic eruption of one tooth in the place of another. This article presents two case reports of transpositions. In the first case, a 21-year-old man presented with a left maxillary canine to molar site transposition. Radiographs showed that the canine was transposed completely. In the second case, a 35-year-old man presented with a right mandibular second premolar that had erupted between the first and second molars. Radiographs showed that the second premolar was positioned between the first and second molars. Maxillary canine to first molar site transpositions are extremely rare. To date, just eight cases have been reported in the English literature. Early loss of the first permanent molar may trigger distal migration of a developing canine bud. A mandibular second premolar erupting between the first and second molars is also a rare position anomaly that has not been reported in the English literature.

Osteoporotic mandibular changes caused by type 2 diabetes mellitus: a comparative study by cone beam computed tomography imaging

ObjectivesStudies on bone mineral density and fracture risk in diabetic patients have attracted interest in the last few years. This study was aimed at comparing mandibular osteoporotic changes assessed by qualitative and quantitative radiographic methods in the mandibles of type 2 diabetes mellitus patients with those of non-diabetic subjects using cone beam computed tomographic images.MethodsThis quantitative and qualitative study of mandibular bone in diabetic patients included 23 type 2 diabetes mellitus patients and an equal number of healthy subjects. Radiomorphometric measurements were performed for each subject using cone beam computed tomography images. Changes in cortical bone thickness were determined by measuring bone area. Fractal dimension analysis was applied to evaluate the trabecular structure of the bone.ResultsNo statistically significant difference could be established between the type 2 diabetes mellitus group and the control group in regard to either radiomorphometric measurements or fractal dimension analysis. Quantitative assessment of mandibular bone indicated a thinning of the cortical bone, with a statistically significant difference between the type 2 diabetes mellitus patients and the healthy controls.ConclusionsBone condition related to diabetes involves complex pathophysiological mechanisms; thus, radiographic imaging parameters may be useful as an adjunct to clinical parameters.

Trabecular structural changes in the mandibular condyle caused by degenerative osteoarthritis: a comparative study by cone-beam computed tomography imaging

ObjectivesTemporomandibular osteoarthritis causes pain and loss of function. In advanced cases, it may also result in destruction of joint cartilage surfaces and bone structure.MethodsThis study was performed to examine the potential changes in the condylar trabecular bone structure in patients with temporomandibular osteoarthritis. Condylar trabecular structures were compared between 35 healthy patients and 35 patients with temporomandibular osteoarthritis by a box-counting method using fractal dimensional analysis on cone-beam computed tomography images.ResultsThe average fractal dimensions of patients with temporomandibular osteoarthritis and healthy patients were 1.18 and 1.23, respectively. This difference was statistically significant (p ≤ 0.05).ConclusionsOur results add to the existing preliminary knowledge regarding the osteoporotic changes that occur in the trabecular structure under the subchondral bone, which is normally not seen on radiographic images, as well as the destruction and remodeling that occur on the condyle surface, which is visible on radiographic images.

The Effect of Slice Thickness on the Volume Estimations Performed by Using Cone Beam CT

Objective : The purpose of this study is to investigate possible effects of the slice thickness on volume estimations with CBCT. Materials and Methods: Intraosseous cavities representing bone defects on femoral condyles of bovines were scanned by CBCT. Consecutive slices at 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm thickness were used to estimate the volumes of the cavities using Cavalieri principle of stereological methods then compared with the volumes obtained by Archimedean principle. Results: The volumes estimated by Cavalieri principle in 0.1, 0.2, and 0.3 mm thickness slices were consistent with the volumes obtained by Archimedean principle (p>0.05). For all the defects on the CBCT images, the volumes of the defects which were calculated with Cavalieri principle in 0.1, 0.2, and 0.3mm slice thickness were found to be consistent with the actual volumes, however, the volumes that were calculated in 0.4 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4mm, and 5 mm slice thickness were found to differ from the actual volumes. Conclusion: When volume calculations were made by Cavalieri principle, the thinnest slice section should be chosen to make calculations consistent with actual volumes.

Unusual location of mandibular osteoid osteoma: A case report

Assist. Prof. Saadettin Kayıpmaz Karadeniz Technical University, Faculty of Dentistry Department of Oral and Maxillofacial Radiology 61080 Trabzon – Türkiye Tel: 05385471295 E-mail: skayipmaz@yahoo.com SUMMARY Osteoid osteoma is a benign nonodontogenic tumor that seldom occurs in the jaws. Severe pain that relieves with NSAIs is characteristic feature of this tumor. A 20-year-old male patient was referred to our clinic with the chief complaint of severe pain in right mandibular posterior region. On panoramic radiograph a radiolucent lesion with sclerotic border surrounding the folicle of partially embedded #48 was observed. #48 was extracted and the lesion was enucleated under local anesthesia. Pathologic examination results were consistent with osteoid osteoma. In this case, it is aimed to present a case of osteoid osteoma in CBCT images with unusual location and radiologic features that radiologists should pay attention to for correct diagnosis

SERBEST DİŞETİ GREFTİ İLE LATERALE KAYDIRILAN FLEP OPERASYONU SONRASI DİŞ VE DİŞETİ KANLANMASININ LASER DOPPLER FLOWMETRY İLE 16 AYLIK TAKİBİ: VAKA RAPORU

OZET Sinoviyal kondromatozis sinoviyumun kartilaj nodullerle gorulen, benign metaplastik proliferatif bozuklugudur. Sinoviyal kondromatozisin etyolojisi henuz net olarak bilinmemektedir. Erken evrelerindeki non spesifik semptomlari nedeni ile mekanik semptomlar gosterene kadar diagnozu zordur. Bu vaka raporunda 71 yasindaki bayan hastada sag temporomandibular eklemde osteoartrit benzeri semptomlar gosteren bir sinoviyal kondromatosiz olgusu ve cerrahi tedavisi anlatilmistir. Genel anastezi altinda sinoviyal kondromatozis nodulleri uzaklastirilmis, kondilektomi ve temporomandibular eklem protezi uygulanmistir. 18. ay klinik ve radyografik kontrol sonucunda hastada kabul edilebilir iyilesme ve TME’de fonksiyonel hareket gozlenmistir. Anahtar Kelimeler: Sinoviyal kondromatozis, TME, kartilaginoz noduller SURGICAL TREATMENT of SYNOVIAL CHONDROMATOSIS in TMJ: A CASE REPORT ABSTRACT Synovial chondromatosis is a benign metaplastic proliferative disorder of the synovium, that appears as cartilaginous nodules. The aetiology of synovial chondromatosis is not fully understood. Until mechanical symptoms appears it is hard to diagnose synovial chondromatosis due to it’s non spesific symptoms in early stages. In this study we presented a case of 71 years old female patient with right temporomandibular joint synovial chondromatosis and it’s surgical treatment that shows osteoarthritis like symptoms. Synovial chondromatosis nodules were removed, condylectomy and temporomandibular joint replacement was performed under general anesthesia. In the 18.months clinical and radiographical follow up the patient had shown acceptable healing and functional movement.of temporomandibular temporomandibular joint. Key Words: Synovial chondromatosis, TMJ, cartilaginous nodules

DİŞSİZ ÇENELERDE DİKEY BOYUT VE SANTRİK İLİŞKİNİN ÇABUK VE TAM OLARAK TAYİNİ

OZET Kapanisin dikey boyutunun tayininde, agiz cizgisi uzunlugu ile ust dudak tuber kulleri arasindaki mesafe ve cene ucu tabani arasindaki esitlige dayanan bir metod kullandik.Bu esitlik iki deger arssinda orSalama 0.05 mm. fark ile 400 kiside olculdukten sonra tesbit edildi. Dissiz ceneler arasinda santrik iliskinin fonksiyonel refleks metodu ile tayini anlatildi. Bu metod, basin suurlu olarak arkaya ve asagiya cekilmesi esriassnda la-comator refleks hareket ile alt cenenin yukari ve arkaya hareketinden ibarettir. Ayal zamanda, yutkunma ve dilin yukariya ve arkaya cekilmesinin, fonksiyonel locomotor testlerinin rolunun sonucu daha da iyilestirdigi aciklandi.