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Periorbital emphysema during dental treatment: a case report.

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Periorbital emphysema during dental treatment: a case report.

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Active implant periapical lesions leading to implant failure: two case reports.

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Active implant periapical lesions leading to implant failure: two case reports.

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Abstract

KUZEY KIBRIS’TA DİŞ HEKİMLİĞİ FAKÜLTESİ ÖĞRENCİLERİNDE TEMPOROMANDİBULER EKLEM DİSFONKSİYONU’NUN PREVALANSI

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KUZEY KIBRIS’TA DİŞ HEKİMLİĞİ FAKÜLTESİ ÖĞRENCİLERİNDE TEMPOROMANDİBULER EKLEM DİSFONKSİYONU’NUN PREVALANSI

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BACKGROUND: The aim of this study was to investigate the neurovascular bundle (NVB) position with cone-beam computerized tomography (CBCT). METHODS: CBCT images of 345 patients were evaluated. The distance from the neurovascular bundle to the cemento-enamel junction (CEJ) was measured (DNB). The distance from mid-palatal suture to the alveolar crest was used to determine the palatal depth. Palatal junction angle (PA) was measured using the junction angle between the hard palate and alveolar crest. The relationships between the DNB and the palatal depth and between these two parameters and the PA were evaluated. Student's t-test was used to analyze the differences in DNB related to gender, and the correlation between the DNB while Pearson correlation analysis was used to determine the correlation between the DNB and age (p?=?0.05). The relationship between the DNB and the palatal depth, and the relationship between these two parameters and the PA were also evaluated using Pearson correlation analysis. RESULTS: Except at the canine and first premolar areas the DNB was positively correlated with the palatal depth. No significant relationship between the PA and DNB or with PVD was observed. The highest DNB was 14 mm at the first molar, and the lowest was 10.8 mm at the canine. CONCLUSIONS: Care is needed while rotating flap and harvesting the subepithelial connective tissue graft at the canine area because the neurovascular bundle passes approximately 11 mm apically to CEJ at the canine region.

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Cone-beam computed tomography evaluation of the soft tissue thickness and greater palatine foramen location in the palate.

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Cone-beam computed tomography evaluation of the soft tissue thickness and greater palatine foramen location in the palate.

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The aim of this study is the investigation of synoviocytes, cytokines and metalloproteinases in the syno- vial in ammation model which is created by zymosan application to temporomandibular joint (TMJ) and effects of pineal hormones melatonin (MEL) and 5-methoxytryptophol (5-MTX) on these parameters. 200-250 g Wistar albino rats of both sexes were used for modeling arthritis in this study. Arthritis model was created by intraarticularly (i.a.) injecting 2 mg zymosan in 40 ml saline into the left temporamandibular joint of the rats while the sham group was created by only injecting 40 ml saline solution (intraarticulary). MEL and 5-MTX administration was made intraperi- toneal before zymosan injection. 6 hours after zymosan or saline administration of MEL and 5-MTX the synovial uid was collected from the animals and the synovial membrane was collected for histological assessment. The administration of zymosan increased the release of IL-1ß and TNF? and the activity of metalloproteinases (MMM-9) and metalloproteinases-2 (MMP-2) and with this administration values got closer to the sham group. The histologi- cal evaluation showed signi cant increase in the intensity of synoviocytes that arose in the in ammation was found to subside. In conclusion, MEL and 5-MTX reducing in ammation in arthritis suggests these agents might constitute a new therapeutic principle clinically.

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PURPOSE: The aim of the present study was to evaluate the performances of 5 different plating techniques for fixation of favorable mandibular angle fractures using the 3-dimensional finite element analysis (FEA) method. MATERIALS AND METHODS: Five different miniplate placement configurations were considered for the fixation of favorable mandibular angle fractures. The following models were created: a double parallel miniplate (M1) placed at the halfway point of the mandibular angle height; a one-third superior-positioned miniplate (M2); a single miniplate (M3) placed at the halfway point of the mandibular angle height (one-half middle-positioned); a one-third inferior-positioned miniplate (M4); and an X-shape miniplate (M5). RESULTS: The M1 and M4 miniplates showed the lowest mechanical stress compared with the other configurations, whereas the M3 and M5 miniplates showed the highest stress levels. CONCLUSION: For favorable mandibular angle fractures, the authors suggest the M1 miniplate or, if used alone, the M4 miniplate is adequate for rigid fixation.

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Abstract

BACKGROUND: Rehabilitation using an implant supported overdenture with two implants inserted in the interforaminal region is the easiest and currently accepted treatment modality to increase prosthetic stabilization and patient satisfaction in edentulous patients. The insertion of implants to the weakend mandibular bone decreases the strength of the bone and may lead to fractures either during or after implant placement. The aim of this three dimensional finite element analysis (3D FEA) study was to evaluate the biomechanical effects of implant diameter in case of facial trauma (2000 N) to an edentulous atrophic mandible with two implant supported overdenture. METHODS: Three 3D FEA models were simulated; Model 1 (M1) is edentulous atrophic mandible, Model 2 (M2), 3.5x11.5 mm implants were inserted into lateral incisors area of same edentulous atrophic mandible, Model 3 (M3), 4.3x11.5 mm implants were inserted into lateral incisors area of same edentulous atrophic mandible. RESULTS: In M1 and M2 highest stress levels were observed in condylar neck, whereas highest stress values in M3 were calculated in symphyseal area. CONCLUSIONS: To reduce the risk of bone fracture and to preserve biomechanical behavior of the atrophic mandible from frontal traumatic loads, implants should be inserted monocortically into spongious bone of lateral incisors area.

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