Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Introduction: Microabrasion is described as a procedure performed on tooth enamel in which the use of an acidic agent and an abrasive agent can correct surface chromatic alterations. Some studies show how the parameters of time, number of applications and the pressure exerted influence the amount of enamel removed.Objective: To establish the thickness of tooth enamel removed according to the abrasive capacity of 9 mechanical chemical treatments, using stereomicroscopy. Materials and methods: With the endorsement of the ethics committee of the School of Dentistry of the National University of Colombia, 90 third molars were collected under informed consent and kept stored under the parameters of ISO 11405. Acrylic blocks were fixed the lingual halves of the dental crowns, creating on them flat surfaces by means of series of sandpaper with irrigation and taking impressions with silicone of addition.They were distributed randomly in 9 groups (n 10). Each group was treated for a period of 30 seconds: G1: Opalustre® (Ultradent), G2: Pumice and 37% phosphoric acid (Ultra-Etch®, Ultradent), G3: Pumice, glycerin and phosphoric acid 37 % (Ultra-Etch®, Ultradent), G4: Yellow halo strawberries (Komet), G5: White halo strawberries (Komet), G6: Sof-Lex® discs (3M), yellow color, G7: Sof-Lex discs ® (3M), yellow and light yellow, G8: Sandblasted, and G9: Perfect Margin ultrasonic tips (Acteon). The wear thickness created was measured using a stereo microscope with an increase of 10X. The collected data were analyzed through the Kruskal-Wallis tests (p≤0.05) to compare all groups and the Mann-Whitney U test (p≤0.05) for individual comparisons. Results: Regardless of the treatment performed, all groups presented enamel wear. The highest wear was recorded for the group treated with yellow halo strawberry (122.66 ± 22.64µm) and the lowest wear for the sandblasting group (11.5 ± 2.36µm). There was a statistically significant difference between all groups. Conclusions: Under the limitations of the present study, it can be concluded: The greatest microabrasion in enamel was produced with strawberries of extra-fine grain (yellow halo) and the least wear occurred with sandblasting.

The Scale of Oral Health Outcomes Scale for children of 5 years (SOHO-5) is an instrument that measure the Oral Health-Related Quality of Life (OHRQoL) of very young children through self-reports and reports from parents. Objective: To translate and cross-culturally adapt the SOHO-5 to the Spanish of Ecuador and to assess its reliability and validity. Materials and Methods: A total of 179 children with their caregivers were randomly selected in the Santa Maria de los Angeles Educational Unit of the city of Quito-Ecuador. For the validation of SOHO-5, clinical variables were used: dental caries (dmf-t), caries severity (PUFA), malocclusions (Grabowski) and trauma (Andreasen). Two pilot tests were carried out at the Santa Clara de Asís school, the first consisted of 20 participants for the understanding of questions and the second with 30 participants where the reliability and stability of the instrument was obtained. Results: For reliability, a Cronbach's Alpha of 0.86, 0.79 and 0.73 was obtained for the children, parents and family scale version, respectively. An Intraclass Correlation Coefficient (ICC) of 0.88, 0.92 and 0.99 for the children, parent’s version and family scale respectively. The SOHO-5 Ec discriminates between the absence and presence of dental caries, pulpitis and presence of fistula (p <0.05). Conclusion: The SOHO5-Ec is a valid and reliable instrument that can be used in Ecuadorian children of 5 years-old.

The elimination of calcium hydroxide in the root canal is decisive for the success of endodontic treatment, the remnants can interact negatively with endodontic sealants increasing filtrations and decreasing the quality of the seal. Objective: To evaluate the effect of intra-duct medication with calcium hydroxide paste on the penetration of the sealing cement inside the dentinal tubules. Materials and methods: 20 distal roots of upper molars were instrumented using the Wave One Large 40 / .08 System. They were randomly divided into two groups: one sealed with a single cone technique and Ah plus cement with rhodamine-B and another sealed with the same technique and Ah plus cement with rhodamine B, previous placement for 15 days and removal by recapping the paste calcium hydroxide. Subsequently, the teeth were cut transversely and photomicrographs of the cervical, middle and apical third were performed using the laser scanning confocal microscopy technique. The maximum depth of penetration was determined through the Image J program. Results: The Ah plus sealing cement had lower penetration values when the calcium hydroxide paste was previously used as an intra-channel medication (p <0.01). The third of the duct with the highest penetration was the cervical third followed by the middle third and finally the apical (p <0.01). Conclusion: Remaining calcium hydroxide decreases the penetration of the sealing cement Ah plus in the dentinal tubules in all thirds of the root canal.

Among the requirements that must be carried out by a provisional restoration, the precise marginal adaptation and adequate sealing of the temporary cementing agent stand out. Objective: To compare the marginal adaptation and tensile strength of temporary crowns made of thermo-curing acrylic and resin, cemented with two types of biomaterial. Methodology: In vitro study. 40 upper premolars were carved to receive a complete crown that was made with two types of provisional biomaterial (n = 20): Veracril® thermosetting acrylic and Temp Basic® resin - CAD / CAM. The crowns were cemented with two temporary cementing agents (Dycal® and TempBond NE®), marginal adaptation was observed by means of a stereo microscope; then, they were subjected to thermocycling for 2,500 cycles and then a second observation and measurement was performed, finally tensile tests were performed. Results: Kruskal Wallis found significant differences between the groups in both study times. The groups cemented with Dycal® presented better marginal sealing before and after thermocycling and greater tensile strength than those cemented with TempBond NE® (p = <0.05). In all groups the marginal adaptation was lower after thermocycling (p = <0.05). By means of the Pearson coefficient, a negative correlation (- 0.97) was determined between marginal maladjustment and tensile strength. Conclusions: The marginal microleakage is related to the cement used, the provisional crowns cemented with Dycal® presented statistically lower marginal discrepancy and greater retention forces in relation to TempBond NE. The thermocycling process influenced the increase in marginal maladjustment in all groups. When the maladjustment was higher, the tensile strength decreased.

Objective: The purpose of this study was to assess the use of a verification jig to correct the position of dental implants in a 3D printed model and to compare its accuracy with dental casts obtained by conventional impression. Materials and methods: Three dental implants were installed in a partial dentate maxillary model and dental casts (n=10) were obtained by conventional and digital impressions. A verification jig was used to determine the implant position into the 3D printed model and its accuracy was compared with conventional cast. Results: Data were analyzed by within ANOVA and post hoc test at a significance level of p ≤ 0.05. A statistically higher measurement error (p≤ 0.05) was found for 3D printed models in comparison with conventional models, with a mean difference of 47µm. Conclusion: The use of verification jig for positioning dental implants in a 3D printed model.

After the process of cementation of cerometer encrustations, microfiltration can occur in the tooth-restoration interface, the gap in the interface can be influenced by the characteristics of the cementing agent and the cementation process. Objective: To evaluate the microfiltration in inlays of ceramics type table top cemented with three different cements. Materials and methods: In 36 third molars divided into 3 groups (n = 12), standardized table top preparations were made and inlays made with CERAMAGE® (SHOFU, Japan) that were cemented with 3 different biomaterials, Group A: cement RelyX® U200 self-etch (3M). Group B: RelyX Ultimate® universal cement (3M, USA). Group C: thermoplastic resin at 55oC. Each sample was subjected to thermocycling (3300 cycles) and placed in a solution of methylene blue for 24 hours. For the analysis, a longitudinal cutting was made in the middle area in the meso-distal direction of the samples and the marginal microfiltration on the mesial and distal side was evaluated with the help of an Olympus stereo microscope. The results were stored in a database in Excel, then the experimental values were archived and coded using the BioEstat software (Brazil). The analysis was performed using the non-parametric Kruskal Wallis test, with a significance of 95%. Results: The thermoplastic resin had the lowest values in the degree of microfiltration with an average of 0.4mm; with the universal cement the highest values were obtained with an average of 1.33mm, which was not significant in relation to the self-etched cement that had an average of 0.88mm. Conclusions: It was possible to determine that in table type restorations the degree of microfiltration was lower when they were cemented with thermoplasticized resin (p = <0.05) with a statistically significant difference with respect to the other cements. There was no difference in microfiltration between self-etched resin cements in relation to universal resin cement.

Bisphosphonate related osteonecrosis of the jaw (BRONJ) is a progressive condition that still has no consensus about its ideal treatment. Fibrin-rich plasma (FRP) therapy shows effectiveness on BRONJ’s treatment by clinicians. A 76-year-old male patient attended for our evaluation complaining of pain in his mouth for 8 months. The medical history showed multiple myeloma metastasis and the use of bisphosphonate (BP) for metastasis control. On intraoral clinical evaluation, suppuration and exposed bone was evident on posterior left mandible measuring approximately 4 centimeters. On panoramic radiograph, we observed a radiolucent image and an area of osseous trabeculae disorganization on left mandible. Computed Tomography (CT) image showed some destruction of lingual and buccal cortical, suggestive of bone sequestration. The treatment was to remove all necrotic bone and fill the defect with FRP from the patient's own blood. Sutures were placed to provide wound primary closure and after 2 months without evidence of exposed bone, the patient came complaining with pain again. After a panoramic radiograph, it was clearly observed a radiolucent image with an image of a jaw discontinuity line, suggestive of mandible fracture in the same side treated before. New surgery was performed and as the intraoral mucosa was perfectly healthy, an extraoral access was made. All the necrotic bone was removed and titanium plates were placed. After 3 months following up, there were signs of bone consolidation and no pain complaint by patient. The patient was able to eating properly and had his quality of life improved.

Corticotomy is defined as an osteotomy, in which the cortical bone is cut, perforated or mechanically altered in a controlled surgical way and at the same time minimally penetrating the bone marrow to accelerate orthodontic dental movement in response to a demand for patients regarding the effectiveness of the treatment and the rapid movement of each zone. Objective: by means of a bibliographic review, determine the distance and time in which an orthodontic movement is achieved after having performed a selective corticotomy. For the search, Platforms such as Pubmed, Scielo, Science Direct and Google Scholar were used, in which keywords such as distance, time, selective corticotomy and orthodontic treatment were used and articles published between 2001 and 2017 were searched. Results: It was obtained that the movements are carried out in a period of 4 months, with respect to the distance and it was observed that an average of 3.5 mm can be moved. Conclusions: in adult patients, the demand for reducing treatment times has increased; orthodontics facilitated by corticotomy achieves successful treatment and decreases treatment times. However, the evidence is scarce, since it is mainly based on case reports, so more research is required about this procedure.