Purpose: The purpose of this study was to compare the retention of zirconia copings cemented onto zirconia implant abutments using four methacrylate-based resin cements and a temporary cement. Materials and Methods: Fifty zirconia copings (Cercon Base) and 10 zirconia abutments (Procera Esthetic Abutments) were fabricated and cemented using four methacrylate-based resin cements and one temporary cement (n = 10). All copings were thermal cycled and the tensile bond strength of the copings was recorded using universal testing machine. One-way analysis of variance (ANOVA) and Tamhane’s T2 tests were used for statistical analysis. Results: Retention values of different cements presented significant differences (P < 0.01). The methacrylate-based resin cements [Premier: 127,95 (± 19,18), Dentotemp: 110 (± 15,48), Cem-implant: 70,38 (± 12,11), Improv: 69,64 (± 16,63)] had more retention than the temporary cement [Tempbond:36,92 (±6,2)].With a higher percentage (78%), cement failure occurred at the cement/abutment interface and the cement remained mostly within the zirconia coping. Conclusion: The cement type may have an influence on the retention of zirconia copings cemented onto zirconia implant abutments. The ranking of the methacrylate-based resin cements used, may direct the cement preference of a clinician in terms of providing desired retention.

Objectives: To determine the quality of maintained dental records and analyze the knowledge and use of them in any of forensic or medico-legal purposes by Sirte’s dental practitioners. Materials and Methods: A cross-sectional survey was conducted in a sample of 70 dental practitioners in Sirte and data were collected through a structured questionnaire. The data so gathered were subjected for descriptive analysis. Results: 80 % of surveyed dentists maintained records but only 10% of them kept the complete dental record. When asked about duration of maintained records, 61% of them kept for less than three years. About 56% of sample used paper prepared form as method to maintain dental records and only 20% used computer software. 91% of practitioners did not think that mandatory to legally maintain the dental records, when asked about whether the legal rights of owning the dental records in Sirte is it medico-legally important, 98% response was yes. The significance of dental records for forensic needs was evaluated, only 18% dental practitioners were asked to produce any records in forensic court of law. Only 3% asked to produce dental file for forensic purposes. 55% of practitioners did not know how to estimate the age of individual. About 94% of sample did not have any training in forensic dentistry. All the surveyed dentists’ response was yes, when asked about the importance of forensic dentistry in Libya. Conclusions: The present study showed Non-maintenance or poor quality of dental records maintained. Our study revealed that the dentists in Sirte are not prepared for any kind of forensic and medico-legal need if it arises due to the poor knowledge, attitude and lack of practice of forensic odontology.

Hyaloronic acid is used widely for as a dermal filler for soft tissue augmentation. It may be injected to the perioral region by dental practitioners. Dental implantation is a common procedure in the dental practice. The article describes a case of dental implant failure following dermal filler injection and describes the possible reasons.

Synchronous malignancy with squamous cell carcinoma (SCC) in the head and neck occurs mainly in the aerodigestive tract, with a frequency of 60-70%. In contrast, SCC in the head and neck very rarely coincides with malignant lymphoma (ML). Here we report a case of synchronous SCC on the lower-left surface of the tongue and ML on the left –side of the neck in a 75-year-old man. The patient had consulted a local doctor for a mass on the left side of his neck. After enucleation of the neck mass, the pathological diagnosis was metastatic malignant tumor of unspecified origin. On the other hand, the tongue lesion was regarded as benign and followed-up. For further diagnosis of the lesions, the patient was transferred to our hospital in March 2015. Biopsy indicated tongue SCC. Resection of the primary tongue lesion and radical neck dissection of the left side neck were then performed. The cervical mass was diagnosed as ML, and found to be simultaneously affected by the tongue SCC and cervical ML. Approximately two years later, a follow-up CT showed recurrent ML on the left tonsil, which was treated by chemotherapy.