A new strategy to improve silicon‐based endodontic treatment tightness by dentine hydrophobization is presented in this work: root dentine was silanized to obtain a hydrophobic dentine‐sealer interface that limits fluid penetration. This strategy was based on the grafting of aliphatic carbon chains on the dentine through a silanization with the silane end groups [octadecyltrichlorosilane (OTS) and octadecyltriethoxysilane]. Dentine surface was previously pretreated, applying ethylenediaminetetraacetic acid and sodium hypochlorite, to expose hydroxyl groups of collagen for the silane grafting. Collagen fibers exposure after pretreatment was visible with scanning electron microscopy, and Fourier transform infrared (FTIR) spectroscopy showed their correct exposition for the silanization (amide I and II, with 1630, 1580, and 1538 cm‐1 peaks corresponding to the vibration of CO and CN bonds). The grafting of aliphatic carbon chains was confirmed by FTIR (peaks at 2952 and 2923 cm‐1 corresponding to the stretching of CH bonds) and by the increasing of the water contact angle. The most efficient hydrophobization was obtained with OTS in ethyl acetate, with a water contact angle turning from 51° to 109°. Gas and liquid permeability tests showed an increased seal tightness after silanization: the mean gas and water flows dropped from 2.02 × 10‐8 to 1.62 × 10−8 mol s‐1 and from 10.8 × 10−3 to 5.4 × 10−3 µL min−1, respectively. These results show clear evidences to turn hydrophilic dentine surface into a hydrophobic surface that may improve endodontic sealing. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2013.

No abstract

Objectives: To evaluate quantitatively deformation of the angle of the horizontal plane of the bevel tip in new dental needles and in dental needles used in clinical procedures. Material and Methods: A cross-sectional study was performed with 360 dental needles from four different manufacturers. The needles were divided into four groups (90 per group): Group 1, Monoject ® ; Group 2, DLP ® ; Group 3, Badiject, and Group 4, Zeyco. The new and used needles were evaluated by scanning electron microscopy to evaluate quantitatively the deformation on the bevel. Results: All groups showed a significantly statistical difference between new needles and needles used for one or two injections (P < 0.05), except for those of Group 4, which exhibited no statistical difference. Conclusion: All dental needles used demonstrated tip deformation after their use, but in addition, dental needles without clinical use also showed deformation.

The coronal-radicular amputation or radicular hemisection is defined as the sectioning fragments coronal-radicular of the lower molar with clinical damage followed endodontic treatment and prosthetics rehabilitation. This clinical treatment is viable in presence of the radicular decay or furca damage. This is a report case of radicular hemisection of lower molar with decay and bone loss that compromise distal root. The objective was elimination of distal root and conserved mesial root with endodontic and prosthetics treatment.

Root canal obturation needs to preserve optimal clinical conditions for achieving success in patients. The aim of the present study was to evaluate endodontic obturation performed by the lateral condensation technique with manual and rotary instruments. Thirty extracted incisors were divided into two groups according to instrumentation technique: group 1-RCSMA57 + Sealapex® and group 2-spreader iRace #30 + Sealapex®. All samples were decoronated and standardized at 10 mm, intraradicular instrumentation were performed with Gates-Glidden #3, and the protocols of irrigation that were employed were 5.25% NaOCl + 17% EDTA during instrumentation. Finally, the groups were obturated with the lateral condensation technique. The samples were observed with conventional X-ray, scanner X-ray, radiovisiography, and Cone Beam computed tomography techniques. For evaluation, a scale of canal obturation density (0 = suitable, 1 = acceptable, 2 = fair, and 3 = inadequate) was employed by blinded evaluator. A value of canal obturation density was assigned in each sample. A statistical analysis by the χ2 of Pearson with a significance level of 0.05% was employed. All groups showed different values according to the instrumentation technique employed. The rotary instrument gave better results than manual instruments according to the values expressed (p = 0.004). The both instruments can be used in the obturation lateral technique; however, the rotary instrument provides better conditions for this technique.