Objectives. This study evaluated the influence of cavity surface finishing with diamond burs of different grit mounted on high-speed turbine and ultrasound on the roughness and microshear bond strength (MBS) of a lithium silicate glass-ceramic to enamel and dentin. Methods. Enamel and dentin specimens were divided into seven groups, according to the type of surface finishing: 1200-grit sandpaper (control), two different brands of medium-grit and fine-grit diamond burs in a high-speed turbine; medium-grit and fine-grit CVD (chemical vapor deposition) tips in an ultrasonic device. Roughness parameters (n = 5) and MSBS to a glass-ceramic (n = 10) were determined. Data were analyzed using ANOVA and Tukey's test (α = 5%). Results. Control group showed lower mean roughness readings and groups that used medium-grit diamond burs showed the highest mean roughness values. Regarding MSBS, there was no statistical difference when comparing the groups gritted with the same brand of medium- and fine-grit burs and tips. Conclusions. Cavity surface finishing influenced the roughness parameters and MSBS of a glass-ceramic to enamel and dentin. Medium-grit diamond burs in high-speed turbine showed the highest mean roughness values. Fine-grit CVD tips in ultrasound presented the highest MSBS values for both enamel and dentin.
Aim: To assess the influence of different fiberglass post surface treatments on the bond strength (BS) to root dentin. Methods: Thirty bovine root canals were endodontically treated and filled with gutta-percha and AH Plus sealer. At 24 h after the endodontic filling, the post spaces were prepared with Gates-Glidden drills and #3 drills of the DC White Post system, maintaining a 4 mm apical seal. The roots were randomly divided into three groups: S (fiberglass posts treated with silane), SA (fiberglass posts treated with silane and a hydrophobic adhesive system) and SHA (fiberglass posts treated with silane, followed by drying with hot air). The posts were cemented with a selfadhesive cement (RelyX U200). The specimens were stored in distilled water at 37 °C for 24 h and subjected to the push-out test (0.5 mm/min). Data were statistically analyzed using one-way ANOVA and Tukey's test (α=0.05) Results: SA and SHA groups showed the highest BS mean values (11.29 and 10.85 MPa, respectively), while the S group presented the lowest BS mean value (7.21 MPa). S group was significantly different from SA and SAH groups. Conclusions: The surface treatment of fiberglass posts influenced BS values.
Introduction: The dentigerous cyst is a benign cyst associated with the development of odontogenic epithelium that covers the crown of impacted teeth. These are prevalent in the first three decades of life, reaching more often Caucasian males. Odontomas are hamartomas affecting the dental tissues, which can be divided into compound and complex odontoma. Odontoma affects children and young adults of both sexes, with a predilection for jaw bone. Case report: A 12-yearold boy attended the Pediatric Dentistry Clinic of Positivo University, complaining of pain in right parasymphysis region. The panoramic radiograph showed an impacted tooth (#43) located in base of the jaw below the apex of the teeth #31 to #42, with increased follicle. A radiopaque mass with small fragments of approximately 1 cm, located at the apex of the teeth #83 and #84 was seen. The patient underwent surgery under general anesthesia to remove the impacted tooth and radiopaque injury. Histopathological analysis of the dental follicle was compatible with dentigerous cyst and dental fragments were diagnosed as compound odontoma. The postoperative was uneventful, four months after the surgery the patient began orthodontic treatment for traction of tooth #44. Conclusion: Both lesions, dentigerous cyst and compound odontoma have favorable prognosis and low recurrence rate, but must be removed to maintain the integrity of the stomatognathic system. In this case was important the inter-relationship between dental specialties for the treatment of the patient.
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