RESUMO
Statement of the Problem: The occurrence of papillary defects adjacent to teeth or dental implants causes both the dental staff and the patients to be concerned about the esthetic issues. Interdental papilla reconstruction surgery is one of the most difficult and unpredictable mucogingival surgeries. Purpose: The present study aimed to investigate the efficacy of hyaluronic acid injection in the reconstruction of the interdental papilla. Materials and Method: This clinical trial study was conducted on four patients with 20 deficient interdental papillae who met the inclusion criteria. At first, local anesthesia was applied. Afterward, 0.2 mL of 1.6% hyaluronic acid (HA) gel was injected (at the tip of the papilla and 2-3 mm below the tip of the papilla) three times every two weeks. At baseline, three, and six months later, clinical photography was taken under standard conditions. The papilla height (the distance between the interdental papilla tip and the basis), black triangle area, and the distance between the interdental papilla tip and contact point of adjacent teeth were all measured using Image J software. Results: The effectiveness of using HA gel in reducing the black triangle area was 85.06%. Furthermore, the papilla length increased by 70.256% while contact to papilla distance decreased by 83.026%. At different times, the values of the studied variables in the three levels were significantly different (p< 0.05). Conclusion: Injection of HA with 1.6% concentration at two points of the interdental papilla was effective in interdental papilla reconstruction at the aesthetic zone, especially in long-term, follow-ups (especially 6 months).
RESUMO
Odontogenic carcinosarcoma is an extremely rare malignant mixed odontogenic tumor, in which both epithelial and mesenchymal component showing malignant cytology features. Due to paucity of reported cases, clinical appearance is unclear. Present study reports a mandibular odontogenic carcinosarcoma in a 33 years-old male with a history of painless mass in the anterior of mandible. The histopathological examination demonstrated a biphasic malignant neoplasm with both epithelial and mesenchymal component malignant features. There were follicles and strands of odontogenic epithelium, which were lined peripherally by ameloblast-like cells. Mesenchyme of tumor was highly cellular resembling dental papilla. Partial mandibular resection, consisting wide surgical excision with immediate reconstruction was accomplished.
RESUMO
STATEMENT OF THE PROBLEM: Different materials can be used to reconstruct the core foundation in all-ceramic restorations. Bond strength of the core material to zirconia is an important factor in long-term restoration success. PURPOSE: The aim of this study was to assess shear bond strength (SBS) of zirconia to four different core materials. MATERIALS AND METHOD: In this experimental in vitro study, 40 zirconia ceramic disks (10×3 mm) were prepared and divided to four groups based on core material. Cylinder shaped core specimens (3×4 mm) of non-precious gold alloy (NPG), zirconia ceramic, natural dentin, and composite resin were prepared and bonded perpendicularly to the zirconia disks using Gillmore Needle Apparatus and dual cure resin cement. All samples were thermocycled for 2000 cycles. To evaluate SBS, the specimens were tested by universal testing machine. Data were analyzed using Kruskal-Wallis test followed by Dunn's test with Bonferroni correction. Statistical significance was set at p< 0.05. RESULTS: The highest values for SBS were achieved in composite resin group (11.58±1.74 MPa) followed by NPG (10.32±0.94 MPa), zirconia (7.3±1.11 MPa) and dentin group (6.53±0.56 MPa). SBS in composite resin and NPG core materials were significantly higher than other core materials (p< 0.05). CONCLUSION: Composite resin and NPG cores showed significant higher bond strength to zirconia in comparison to dentine and zirconia core materials.