Biomedical subjects

J M Navajas-Rodríguez de Mondelo

Publications and source records attributed to J M Navajas-Rodríguez de Mondelo.

4 recordsLinked to original sources

PubMed2004

In vitro evaluation of the accuracy of three electronic apex locators.

The accuracy of three electronic apex locators (EALs) (Justy II, Root ZX, and Neosono Ultima EZ) is evaluated, together with the concordance of the measurements obtained by two different operators. Twenty single-root human teeth were used, sectioning the crown to gain access to the root canal. A first operator (A) determined the reference (or control) length (corresponding to the actual length) for each tooth, after which all teeth were measured individually and independently by the other two operators (B and C). The results obtained with each EAL and by each operator were in turn compared with the corresponding control length. The statistical analysis of the results showed EAL reliability in detecting the apex to vary from 80% to 85% and 85% to 90% (depending on the operator) for the Justy II and Neosono systems, respectively, whereas reliability was found to be 85% for the Root ZX device. These results, combined with a high interobserver concordance, suggest electronic root canal measurement to be an objective and acceptably reproducible technique.

Chi-Square Distribution↗

PubMed2002

A comparative study of apical leakage of Endomethasone, Top Seal, and Roeko Seal sealer cements.

A comparison was made of the apical leakage of three sealers. Fifty single-root human teeth were randomly divided into 5 groups (n = 10; 3 experimental and 2 control). The teeth of the positive-control and experimental groups were instrumented with K-type files to size 45. The experimental groups were obturated by laterally-vertically, condensed gutta-percha with Endomethasone, Top Seal, or RSA sealer cements. The positive-control group was nonobturated and the negative-control group was noninstrumented. The root surfaces were then coated with nail varnish (except the apex in the experimental groups) and immersed in black ink (for 1 week at 37 degrees C). The statistical evaluation of the results obtained by clearing and cross-section techniques showed no significant differences between sealers. Leakage, as determined by the clearing technique, was significantly greater than that quantified by cross-section analysis.

Administration, Topical↗

PubMed2001

The effect of various surface treatments and bonding agents on the repaired strength of heat-treated composites.

STATEMENT OF PROBLEM: Some clinical situations may require the repair of a secondary polymerized or aged composite. The higher indirect resin conversion rate may prove to be a disadvantage if a repair procedure based on covalent bonding from unreacted methacrylate groups is attempted. PURPOSE: This study evaluated the effectiveness of different combinations of surface treatments and 2 bonding agents used to enhance heat-polymerized and aged composite repairs. MATERIAL AND METHODS: Ninety Herculite XRV and 90 Heliomolar Radiopaque specimens were prepared and then postpolymerized and stored for 4 weeks. All composites were subjected to 1 of 9 treatment regimens that involved adding fresh composite onto a corresponding postpolymerized composite (Herculite/Herculite or Heliomolar/Heliomolar). The surfaces were treated with different combinations of air abrasion, phosphoric acid, hydrofluoric acid, acetone, Special Bond II, Heliobond, and Prime & Bond 2.0. RESULTS: Surface treatment with air abrasion resulted in the strongest repairs; surface treatment with phosphoric acid resulted in the weakest repairs. CONCLUSION: The use of air abrasion and Prime & Bond 2.0 adhesive consistently improved the shear bond strength for both composites tested.

Acetone↗

PubMedDate not supplied

Individualized wedge.

The preparation of an individualized wedge in the gingival embrasure before cavity preparation using photo-cured resin permits rehabilitation of the interproximal space and the original contact point position. Because the individualized wedge completely fills the embrasure, the adaptation to the gingival and proximal walls of the molar to be restored is perfect, avoiding any overextension of obturation material during insertion. Furthermore, the original position of the contact point is preserved.

Composite Resins↗