Background The accuracy of impression techniques determines the marginal fit of fixed prostheses. Marginal accuracy plays a main role in the success and failure of treatments. This in-vivo study evaluated the marginal fit of anterior three-unit monolithic zirconia fixed partial dentures (FPDs) using conventional and scannable polyvinyl siloxane impression materials. Methods Ten patients were selected to replace the lateral teeth with a three-unit monolithic zirconia bridge. For each patient, in the first group, an impression was made with a two-step putty-wash technique using scannable polyvinyl siloxane material (BONASCAN; DMP, Greece). In the identical session, as the second group, an impression of conventional putty-wash polyvinyl siloxane was taken (BONASIL A+ Putty; DMP, Greece). The marginal discrepancy was measured through the replicas, which were cut perpendicularly within the buccolingual and mesiodistal directions. An Independent t-test was employed for data analyses (P < 0.05). Results The marginal discrepancy in a conventional method for central abutment in mid-buccal, mid-lingual, mid-mesial, and mid-distal was higher than in the scannable method but it was not significant (P > 0.05). Also, the marginal discrepancy for canine abutment in the conventional method was higher than in the scannable method, but it was not significant, either (P > 0.05). Conclusions FPDs fabricated from both scannable and conventional impression materials were not superior to each other in marginal fit for both central and canine abutments by evaluation using the replica technique.

Glomus tumors are rare benign neoplasms usually occurring in the upper and lower extremities. However, oral cavity involvement is rare, with only a few case reports. We present a 37-year-old male patient with a chief complaint of an exophytic lesion in the left buccal mucosa for one year referred to our center. At the time, he did not have any pain or lymphadenopathy. The patient underwent surgery using a high-power CO 2 laser. His histopathological examination revealed a glomus tumor. After 2 years of follow-up, no evidence of recurrence was detected. Glomus tumors should be taken seriously when patients have a painless exophytic bluish lesion in the buccal mucosa.

Background: This in-vivo study aimed to evaluate the marginal fit of three-unit monolithic zirconia fixed partial dentures (FPDs) using conventional and scannable polyvinyl siloxane impression materials because of the great importance of marginal accuracy. Methods: Ten patients were selected to replace the lateral teeth with a three-unit monolithic zirconia bridge. In the identical session, for each patient, as in the first group, an impression was made with a two-step putty-wash technique using scannable polyvinyl siloxane material (BONASCAN; DMP, Greece), and for the second group, an impression of conventional putty-wash polyvinyl siloxane was taken (BONASIL A⁺ Putty; DMP, Greece). The marginal discrepancy was measured once the replicas were cut perpendicularly within the buccolingual and mesiodistal directions. An Independent t-test was employed for data analyses (P < 0.05).Results: The marginal discrepancy in a conventional method for central abutment in four regions and canine abutment in mid-buccal, mid-lingual, and mid-distal was higher than in the scannable method but marginal discrepancies were not significant (P>0.05). However, the marginal discrepancy for mid-mesial in the scannable method was higher than in the conventional method, but it was not significant (P>0.05). Conclusions: FPDs fabricated from both scannable impression materials and conventional impression materials were not superior to each other in marginal fit by evaluation using the replica technique.

Background: Both low-level laser therapy (LLLT) and platelet-rich plasma (PRP) have been suggested to improve the repair of mandibular defects. This study investigated the mechanical properties and calcium content at the tooth extraction site in the rat model exposed to LLLT (λ=808 nm) with or without PRP. Methods: In this experimental rat model, the maxillary left first molar teeth were extracted in twenty male rats. Then, they were divided randomly into four groups. Group one: the extraction sockets were treated by 0.9 W gallium-aluminum-arsenide (GaAlAs) diode laser irradiation for five minutes every 72 hours after extraction for the next 12 days (4 times in overall); group two: PRP was placed in the extraction sockets; group three: a combination of both treatments (LLLT+PRP) was done; group four: untreated extraction socket as the control group. All rats were sacrificed 30 days post-operative. All bone blocks of the extracted socket were prepared for mechanical strength and calcium content analyses. Results: The compressive strength in the laser group was significantly higher than in both the control and PRP-treated groups (p=0.0001 and 0.00044, respectively). Although a combination of both PRP and LLLT elevated the mechanical strength compared to the control and PRP groups, it was statistically similar to LLLT/PRP group. Calcium content did not change by any of the treatments. Conclusions: Mechanical and chemical analyses on the bone blocks demonstrated that LLLT improved bone healing; however, PRP alone or combined with LLLT did not show a synergistic impact.

Aim: This retrospective study aimed to investigate the cause and pattern of temporomandibular joint (TMJ) ankylosis in patients who have been treated for this condition at a major urban teaching hospital.Methods and Materials: In this study, we reviewed all the patients treated for temporomandibular joint ankylosis for six years at an urban teaching hospital between 2015 to 2021 who had sufficient information available. Demographic information as well as etiology and pattern of ankylosis, the time lapse between injury and treatment, concomitant facial injury, fragment displacement, prior condyle treatment, mouth opening before and after treatment of ankylosis, complications, and position of the ramus stump or hemicondyle in relation to the glenoid fossa, follow up period, and physiotherapy before and after ankylosis treatment. Results: Among 32 patients with 45 involved joints, with an average age of 29.90± 17.08 years, mostly between 20-29 years old (n=10); the leading cause of temporomandibular joint ankylosis was trauma with n=25 (78%). The ratio of men to women was 23 to 9, and the ratio of bilateral involvement to unilateral ones was 13:9. The most common chief complaint of the patient was restricted mouth opening with n=24 (75%). Twenty-four patients had complete temporomandibular joint ankylosis. The mean of maximum mouth opening before surgery was 0.95 ± 0.45 cm, which increased significantly to 4.50 ± 0.50 cm (p <0.001) after treatment.Conclusions: This study showed that trauma was the most common cause of temporomandibular joint ankylosis in the studied patients. The most common chief complaint of the patient was the limitation of mouth opening. The results of this study also have shown that TMJ ankylosis is more common in men than women, and surgery is significantly effective in improving the function of TMJ in these patients.