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

Hallermann-Streiff syndrome (HSS) is a rare oculomandibulofacial discephaly with hypotrichosis that occurs as a sporadic mutation. It is characterized by abnormal findings especially in head and face. Dental anomalies occur in 50-80% of the patients. In this case report, facial-oral findings and the existing dental anomalies of the syndrome in a 6-year-old male patient diagnosed with HSS were identified. Dental rehabilitation and a 12-month follow-up of the patient were reported. Each case presented with this rare syndrome may contribute to the literature to determine the prognosis of the disease and to take protective and preventive measures.

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The Coronavirus 2019 disease (COVID-19), was declared a pandemic by the World Health Organization on March 11, 2020, and registered the first case in Costa Rica on March 6, 2020, and 105 days later reported 2058 cases, with a wide age range (0-92 years). Its etiologic agent is the beta coronavirus SARS-CoV-2 with confirmed human-to-human transmission, mainly by the respiratory route. The presence of asymptomatic carriers of the virus and its transmission even without the manifestation of symptoms challenges health professionals worldwide. For this reason, assuming all patients who need dental care as possible carriers of the SARS-CoV-2 is mandatory and consequently, applying biosecurity measures with strict criteria. In the present literature review, we aim to recommend biosecurity measures to be applied during imaging examinations of dental patients due to the Coronavirus-2019 pandemic. We found that in the absence of treatment for COVID-19 disease and because of its high transmissibility, the most effective measures to prevent its spread are those allowing its containment. Therefore, the authors recommend: 1) acquiring imaging exams just in case of dental urgencies or emergencies, 2) prioritizing the use of extraoral exams, such as panoramic radiography or CBCT, under the principle of ALADAI and 3) the intraoral exams should be used just in case of a lack of extraoral imaging devices, or because of the need to solve diagnostic tasks in which they have a superior diagnostic value than those of the extraoral examinations.

Different factors can influence the perception of quality of life in individuals with intellectual disabilities. This study investigated the factors associated with quality of life related to oral health in children with intellectual disabilities from the perspective of their parents. A cross-sectional study was carried out with Brazilian children from specialized institutions and their respective guardians. Data were collected through medical records, application of instruments and oral clinical examination (n=92). Most children had poor oral hygiene (64.10%) and a high caries experience (59.8%). The mothers' perception of quality of life related to oral health was low, however there was an association of greater perception when they had low education, female child, less brushing frequency and history of breastfeeding (p≤0.05). Although the perception of quality of life was low, the oral condition found evidences the need to promote oral health education actions with children with intellectual disabilities and their respective guardians.

Differences in liquid-to-powder ratio can affect the properties of calcium silicate-based materials. This study assessed the influence of powder-to-gel ratio on physicochemical properties of NeoMTA Plus. Setting time (minutes), flow (mm and mm²), pH (at different periods), radiopacity (mm Al) and solubility (% mass loss) were evaluated using the consistencies for root repair material (NMTAP-RP; 3 scoops of powder to 2 drops of gel) and root canal sealer (NMTAP-SE; 3 scoops of powder to 3 drops of gel), in comparison to Biodentine cement (BIO) and TotalFill BC sealer (TFBC). Statistical analysis was performed using one-way ANOVA and Tukey tests (α=0.05). BIO had the shortest setting time, followed by NMTAP-RP and NMTAP-SE. TFBC showed the highest setting time and radiopacity. BIO, NMTAP-RP, and NMTAP-SE had similar radiopacity. All materials promoted an alkaline pH. NMTAP-RP/SE presented lower solubility than BIO and TFBC. Regarding the flow, TFBC had the highest values, followed by NMTAP-SE, and NMTAP-RP. BIO had the lowest flow. In conclusion, NMTAP in both powder-to-gel ratios showed high pH and low solubility. The increase in the powder ratio decreased the setting time and flow. These findings are important regarding the proper consistency and work time to clinical application.

Objective: This study investigated the effects of three types of mouthwash on the color stability of three resin-based restorative materials (nanohybrid resin composite, sonic-activated bulk-fill material, and compomer). Materials and Methods: To this end, 120 cylindrical disc specimens were prepared and polished, after which they were incubated in distilled water for 24 hours for post-polymerization. The baseline color values of each specimen were measured with a spectrophotometer, then the specimens were randomly divided into four groups. Following immersion in the mouthwashes for 24 hours, the specimens were rinsed with distilled water and dried before the color measurement was repeated. The values of color change (∆E₀₀) were subsequently calculated. A two-way analysis of variance and Duncan’s post hoc multiple comparison tests were conducted to determine statistically significant differences among the restorative materials. Results: All samples showed discoloration after immersion, albeit some instances of discoloration were imperceptible. In this respect, a statistically significant difference was found among the restorative materials and mouthwashes (p<0.05). Imperceptible ∆E₀₀ values were derived on the nanohybrid resin composite and compomer, but perceptible and acceptable ∆E₀₀ values were detected on the sonic-activated bulk-fill materials (p<0.05). The clinically unacceptable discoloration was observed on the sonic-activated bulk-fill composite immersed in Listerine®. Conclusions: Clinicians should make recommendations based on the potential staining capacity of mouthwashes prescribed for daily use in restorative materials. In this way, the need for renewal of restorations due to discoloration could be avoided.

The aim of this study was to evaluate and compare the effects of different light sources on shear bond strength when bulk-fill composite was used for the repair of different composite resins. A total of 126 samples made from six resin composites with different properties were aged (thermal-cycling with 5000 cycle), exposed to the same surface treatments and adhesive procedure. Then, they were repaired with a bulk-fill composite. At the polymerization step, each group was divided into three subgroups (n=7) and light cured with a QTH light source for 40s and two different LED light sources for 20s. Subsequently, the specimens were aged in distilled water at 37 ºC for 4 weeks and then subjected to shear bond strength test. Then, the specimens were examined under a stereomicroscope to identify modes of failure and visualized by Scanning Electron Microscope. Data obtained from the study were analyzed using ANOVA and Tukey HSD Test (α=0.05). In all groups, the light curing units had an impact on shear bond strength (p<0.05). Among the study groups, the greatest bond strength values were observed in the specimens repaired using the LED and the specimens repaired with the QTH light curing unit had the lowest bond strength values. It was concluded that the content of composite resins and light curing units may influence bond strength of different composites repaired with the bulk-fill composite.

Dental practice faces the paradigm shift and the modification of protocols in biosafety, an aspect that has become a variable to be practiced by each professional as part of their conduct at all times in order to survive as a profession in the face of the global pandemic that it represents the risk of transmission of the new coronavirus called COVID-19. One of the most important problems in dental biosecurity is represented by the generation of bioaerosols, since these are vectors that transport microorganisms to inside people’s bodies, which generates a potential occupational risk already known in the dental sciences but that it is enhanced with the transmissibility and pathogenicity of the new coronavirus. Until now, there are many questions about transmission through aerosols of SARS-CoV-2 , so the general objective of this review is to understand the scientific elements that govern the aerodynamics of bioaerosols applied to the dental environment and how these can become a potential virus disseminator when intraoral dental procedures are performed in infected patients. Understanding the aerodynamics of bioaerosols helps us understand how SARS-CoV-2 present in bioaerosol generated by dental procedures in infected patients can vary in terms of viability and infectivity by influencing other factors such as relative humidity, room temperature, air currents, bioaerosol physicochemical factors and the host´s immune system.

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