Abstract in English:

Aim To evaluate parents’ knowledge about obstructive sleep apnea syndrome in preschoolers in the primary dentition in the city of Parnaíba-PI. Methods The questionnaire on obstructive sleep apnea syndrome (OSAS) in children was applied to parents of children between 2 and 6 years of age, in the deciduous dentition who were attending preschool in public and private kindergarten. It contained objective questions distributed in two parts: the first that determined the epidemiological profile of parents and children; the second part with 22 questions that checked the parents’ knowledge about the child’s sleep and behavior during the day. As an interpretation, the questionnaires that presented 36.3% of the answers YES to the 22 specific questions, the child was considered at high probability for developing OSAS. Results The average age of the children was approximately 4 years old. Regarding weight, an average of 22 kilos and an average height of 107.45 cm and an average BMI of 18.75, confirmed by notes on the vaccination card. Loud snoring, loud or heavy breathing, and overweight were significantly associated with OSAS (p < 0.001). From a total of 250 children, it was observed that the prevalence rate of high possibility for the development of OSAS was 6% (n=15). Conclusion Parents were not aware of OSAS, but after applying the questionnaire, they were able to understand the suggestive signs of the syndrome and the importance of early diagnosis.

Abstract in English:

Aim This study aimed to assess the effects of a hydroelectrolytic beverage on the surface roughness and microhardness of different bulk fill resin composites. Methods Sixty resin composite samples were prepared and divided into three groups: FiltekTM Z350 (C), FiltekTM One Bulk Fill (BF-F), and Opus Bulk Fill APS (BF-O). These were further subdivided to analyze two beverage groups: GatoradeTM Lemon (GL) and distilled water (control). Surface roughness (Ra), surface microhardness (KHN), and scanning electron microscopy (SEM) results were evaluated (n=10). The data were subjected to two-way ANOVA (for roughness) or three-way ANOVA (for microhardness), followed by Tukey’s post hoc test (α=0.05). Results The C group exhibited higher microhardness than the BF-F and BF-O groups, regardless of the solution used. A reduction in microhardness was observed in all groups when comparing initial and final time points. SEM images revealed variations in the size, amount, and arrangement of particles among the different resin composites. Conclusion The study concluded that the microhardness of different bulk fill resin composites decreases when exposed to either the hydroelectrolytic beverage or distilled water. However, the type of immersion liquid did not influence the surface roughness of the evaluated composite resins.

Abstract in English:

Aim this study is to evaluate the effect of corrosion on flexural fracture resistance in orthodontic mini-implants composed of two materials and submerged in salivary substitutes with or without fluoride. Methods twenty mini-implants were used, 10 from SIN Company (Ti6AL4V alloys) and 10 from Morelli (steel alloys), (G1: Ti6AL4V in fluoride-free saliva solution; G2: Ti6AL4V in saliva solution with 1500 ppm of fluoride; G3: Steel in saliva without fluoride; and G4: Steel in saliva with 1500 ppm of fluoride). The samples were taken to a potentiostat to evaluate the corrosion, and then were evaluated under scanning electron microscopy (SEM). Then, the mini-implants underwent flexural fracture resistance tests. Kruskal-Wallis test with the Student-Newman-Keuls comparison evaluated the corrosion and pitting potentials of each group. ANOVA and Tukey’s comparison test at a 1% significance level. Results All groups suffered corrosion potential and pitting potential, but those that were in solutions with the presence of fluoride showed less resistance to the formation of corrosion pits (G1 and G3). In the SEM analysis after flexural resistance, small cavities suggestive of pitting corrosion were noted. The G4 was the only one that formed the passivation potential. In the fracture resistance test, mini-implants manufactured by Ti6AL4V fractured with less force applied (G1 and G2). Most steel mini-implants (G3 and G4) only deformed with a higher force application. Conclusion Fluoride acts to corrode mini-implants, regardless of their manufacturing material. Regarding flexural resistence, the corrosion rate of the mini implants did`nt influence the fracture resistance values.

Abstract in English:

Background and Aim It is acknowledged that controlling the vertical dimension is a crucial and frequently challenging aspect of orthodontic treatment. The present study evaluated the micro-implant effect in angle class II malocclusion patients. Methods All articles published in international databases such as PubMed, Scopus, Science Direct, ISI Web of Knowledge, and Embase between 2012 and July 2022 are included. Meta-analysis data collected from selected studies were performed using Stata/MP.V17 software. Results The abstracts of 718 studies were reviewed, and finally, 12 studies were selected. The mean differences of vertical change of lower and upper molar between micro-implants were -0.88 (MD, 95% CI -1.15, -0.60; p=0.00). Conclusion Based on the present study’s findings, using a Micro-implant compared to conventional anchorage has better vertical control. It is suggested that future studies be conducted with a similar cognitive methodology of higher quality and get help from methodological guidelines.