Artigos Científicos - FOUFPA/ICS
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Navegando Artigos Científicos - FOUFPA/ICS por Periódicos "Dental Press Journal of Orthodontics"
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Item Acesso aberto (Open Access) Air-powder polishing on self-ligating brackets after clinical use: effects on debris levels(Universidade Federal do Pará, 2016-10) ARAGÓN, Mônica Lídia Castro de; LIMA, Leandro Santiago; NORMANDO, Antonio David CorrêaIntroduction: Debris buildup on brackets and arch surfaces is one of the main factors that can influence the intensity of friction between bracket and orthodontic wire. Objective: This study sought to evaluate the effect of air-powder polishing cleaning on debris levels of self-ligating ceramic brackets at the end of orthodontic treatment, compared to the behavior of conventional brackets. Methods: Debris levels were evaluated in metal conventional orthodontic brackets (n = 42) and ceramic self-ligating brackets (n = 42) on canines and premolars, arranged in pairs. There were brackets with and without air-powder polishing. At the end of orthodontic treatment, a hemiarch served as control and the contralateral hemiarch underwent prophylaxis with air-powder polishing. Debris buildup in bracket slots was assessed through images, and Wilcoxon test was used to analyze the results. Results: The median debris levels were statistically lower in the conventional metal brackets compared to self-ligating ones (p = 0.02), regarding brackets not submitted to air-powder polishing. Polishing significantly reduced debris buildup to zero in both systems, without differences between groups. Conclusions: Ceramic self-ligating brackets have a higher debris buildup in comparison to conventional metal brackets in vivo, but prophylaxis with sodium bicarbonate jet was effective in reducing debris levels in self-ligating and also in conventional brackets.Item Acesso aberto (Open Access) Alterations in plaque accumulation and gingival inflammation promoted by treatment with self-ligating and conventional orthodontic brackets(Universidade Federal do Pará, 2015-04) CARDOSO, Mauricio de Almeida; SARAIVA, Patrícia Pinto; BRANGELI, Liliana Ávila Maltagliati; RHODEN, Fernando Kleinübing; COSTA, Carla Cristina Alvarenga ; NORMANDO, Antonio David Corrêa; CAPELOZZA FILHO, LeopoldinoObjective: The aim of the present study was to evaluate, comparatively, the periodontal response during orthodontic treatment performed with self-ligating and conventional brackets.Methods: Sixteen Caucasian individuals of both sexes, aged between 12 and 16 years old and in permanent dentition were selected. Eight individuals were treated with conventional brackets installed on the lower dental arch and self-ligating brackets on the upper arch. Another eight individuals received self-ligating brackets in the lower arch and conventional brackets in the upper arch. The subjects received material and instructions for oral hygiene. Visible plaque index (VPI), gingival bleeding index (GBI) and clinical attachment level (CAL) were evaluated just after installation of orthodontic appliances, and 30, 60 and 180 days later. Mann-Whitney test was used to compare differences between groups (self-ligating and conventional), twoway ANOVA followed by Tukey’s test was used to assess CAL at each site of each tooth. Significance level was set at 5%. Results: No significant changes were found with regard to the assessed parameters (VPI, GBI and CAL) in either one of the systems.Conclusion: No significant changes were found with regard to the periodontal response to orthodontic treatment for the variables assessed and between subjects receiving passive self-ligating and conventional brackets. All individuals had received oral hygiene instructions and had their periodontal conditions monitored.Item Acesso aberto (Open Access) Changes in lower dental arch dimensions and tooth alignment in young adults without orthodontic treatment(Universidade Federal do Pará, 2015-06) MAUAD, Bruno Aldo; SILVA, Robson Costa; ARAGÓN, Mônica Lídia Castro de; PONTES, Luana Farias; SILVA JÚNIOR, Newton Guerreiro da; NORMANDO, Antonio David CorrêaObjective: The aim of this longitudinal study, comprising young adults without orthodontic treatment, was to assess spontaneous changes in lower dental arch alignment and dimensions. Methods: Twenty pairs of dental casts of the lower arch, obtained at different time intervals, were compared. Dental casts obtained at T1 (mean age = 20.25) and T2 (mean age = 31.2) were compared by means of paired t-test (p < 0.05). Results: There was significant reduction in arch dimensions: 0.43 mm for intercanine (p = 0.0089) and intermolar (p = 0.022) widths, and 1.28 mm for diagonal arch length (p < 0.001). There was a mild increase of approximately 1 mm in the irregularity index used to assess anterior alignment (p < 0.001). However, regression analysis showed that changes in the irregularity index revealed no statistically significant association with changes in the dental arch dimensions (p > 0.05). Furthermore, incisors irregularity at T2 could not be predicted due to the severity of this variable at T1 (p = 0.5051). Conclusion: Findings suggest that post-growth maturation of the lower dental arch leads to a reduction of dental arch dimensions as well as to a mild, yet significant, increase in dental crowding, even in individuals without orthodontic treatment. Furthermore, dental alignment in the third decade of life cannot be predicted based on the severity of dental crowding at the end of the second decade of lifeItem Acesso aberto (Open Access) Cleansing orthodontic brackets with air-powder polishing: effects on frictional force and degree of debris(Universidade Federal do Pará, 2016-08) LEITE, Brisa dos Santos; FAGUNDES, Nathália Carolina Fernandes; ARAGÓN, Mônica Lídia Castro de; DIAS, Carmen Gilda Barroso Tavares; NORMANDO, Antonio David CorrêaIntroduction: Debris buildup on the bracket-wire interface can influence friction. Cleansing brackets with air-powder polishing can affect this process. Objective: The aim of this study was to evaluate the frictional force and amount of debris remaining on orthodontic brackets subjected to prophylaxis with air-powder polishing. Methods: Frictional force and debris buildup on the surface of 28 premolar brackets were evaluated after orthodontic treatment. In one hemiarch, each bracket was subjected to air-powder polishing (n = 14) for five seconds, while the contralateral hemiarch (n = 14) served as control. Mechanical friction tests were performed and images of the polished bracket surfaces and control surfaces were examined. Wilcoxon test was applied for comparative analysis between hemiarches at p < 0.05. Results: Brackets that had been cleaned with air-powder polishing showed lower friction (median = 1.27 N) when compared to the control surfaces (median = 4.52 N) (p < 0.01). Image analysis showed that the control group exhibited greater debris buildup (median = 2.0) compared with the group that received prophylaxis with air-powder polishing (median = 0.5) (p < 0.05). Conclusion: Cleansing orthodontic brackets with air-powder polishing significantly reduces debris buildup on the bracket surface while decreasing friction levels observed during sliding mechanics.Item Acesso aberto (Open Access) Color changes of esthetic orthodontic ligatures evaluated by orthodontists and patients: a clinical study(Universidade Federal do Pará, 2016-10) KAWABATA, Edilene; DANTAS, Vera Lucia; KATO, Carlos Brito; NORMANDO, Antonio David CorrêaObjective: To evaluate in vivo changes in the color of esthetic elastomeric ligatures from different manufacturers. Methods: Four widely used commercial brands of elastomeric ligatures were selected and used in 20 adult patients in a splitmouth design. The ligatures were evaluated by orthodontists and patients in a double-blind manner on the day the ligatures were placed (T0 ) and 30 days after intraoral exposure (T1 ) by means of a system of staining scores. Groups were compared by Friedman test with p < 0.05. Results: Orthodontists and patients reported similar staining scores (p > 0.05). Results showed that all brands underwent significant staining when exposed to the intraoral environment. Modularcrystal MorelliTM (Sorocaba, SP, Brazil) showed the highest degree of staining with the median reaching the maximum value (3); while the other brands (3M UnitekTM, American OrthodonticsTM and GAC DentsplyTM) showed the median equal to 1 (p < 0.001). A large individual variability in the degree of staining was also found for all brands. Conclusions: All four brands of esthetic ligatures showed significant staining, which appeared to be more pronounced for the MorelliTM brand. Changes in color of the elastomeric ligatures were perceived similarly by patients and orthodontists. The industry needs to improve the color stability of esthetic ligatures.Item Acesso aberto (Open Access) Deflection test evaluation of different lots of the same nickel-titanium wire commercial brand(Universidade Federal do Pará, 2016-02) NEVES, Murilo Gaby; LIMA, Fabrício Viana Pereira; GURGEL, Júlio de Araújo; VERCELINO, Célia Regina Maio Pinzan; REZENDE, Fernanda Soares; BRANDÃO, Gustavo Antônio MartinsIntroduction: The aim of this in vitro study was to compare the elastic properties of the load-deflection ratio of orthodontic wires of different lot numbers and the same commercial brand. Methods: A total of 40 nickel-titanium (NiTi) wire segments (Morelli OrtodontiaTM - Sorocaba, SP, Brazil), 0.016-in in diameter were used. Groups were sorted according to lot numbers (lots 1, 2, 3 and 4). 28-mm length segments from the straight portion (ends) of archwires were used. Deflection tests were performed in an EMIC universal testing machine with 5-N load cell at 1 mm/minute speed. Force at deactivation was recorded at 0.5, 1, 2 and 3 mm deflection. Analysis of variance (ANOVA) was used to compare differences between group means. Results: When comparing the force of groups at the same deflection (3, 2 and 1 mm), during deactivation, no statistical differences were found. Conclusion: There are no changes in the elastic properties of different lots of the same commercial brand; thus, the use of different lots of the orthodontic wires used in this research does not compromise the final outcomes of the load-deflection ratio.