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Prog Orthod ; 22(1): 2, 2021 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-33409700


BACKGROUND: The aim of this study was to investigate the effect of surface roughening and acid etching on clinical success rate and removal and insertion torque of orthodontic miniscrews. MATERIALS AND METHODS: Sixty-two orthodontic miniscrews (Jail Medical Corporation, Seoul, Korea) with the same design and dimensions (10-mm length, 2-mm diameter) are divided into two (sandblasted and acid-etched versus control) groups. The sample of the study was 31 patients whose miniscrews were needed for en masse retraction of the upper six anterior teeth. In this split-mouth study, the miniscrews were placed in the attached gingiva between the second premolar and the first molar. The side (left or right) was selected randomly. The miniscrews were loaded 6 weeks after insertion, and the patients were followed up after 3, 6, 10, 14, and 18 weeks and then for 4 weeks interval. Chi-square, correlation, and independent t tests were done using SPSS ver24 to interpret the data. RESULTS: The survival rate was 90.3% and 83.9% for the sandblasted and acid-etched versus the control group, respectively. The difference in survival rate was not statistically significant (p > 0.05). Removal torque was higher for the sandblasted group (p < 0.05). Younger patients showed less survival rate (p < 0.05) in both groups. Insertion side, namely, left or right, was not statistically significant. CONCLUSIONS: Although sandblasting increased removal torque, it did not influence the survival rate of orthodontic miniscrews significantly.

Procedimentos de Ancoragem Ortodôntica , Parafusos Ósseos , Humanos , Boca , Desenho de Aparelho Ortodôntico , Taxa de Sobrevida , Torque
Artigo em Inglês | LILACS-Express | LILACS, BBO - Odontologia | ID: biblio-1056845


Abstract Objective: To compare gingival and dental health indices between breastfeeding and non-breastfeeding women during the first 6-month period after childbirth. Material and Methods: In this longitudinal study, 25 lactating mothers and 25 non-lactating mothers who had delivered a month ago were examined. The groups were identical in terms of educational level, age, income, and delivery time. Periodontal and dental indices including Pocket Depth (PD), Gingival Index (GI), Clinical Attachment Level (CAL), Bleeding on Probing (BOP) and DMFT were checked initially and after 2-4-6 months. Data were presented with the use of descriptive statistics (means, standard deviations, and frequencies). The gingival health parameters were compared between the two groups with the use of Chi-square, Wilcoxon, and Kruskal-Wallis tests Results: Evaluation of PD showed that in the breastfeeding mothers increased from 1.97 mm at baseline to 2.44 mm after six months, while in the non-breastfeeding mother, the PDs increased from 2.03 mm at baseline to 2.11 mm after six months and at the 6-month interval, the PDs were significantly higher in the breastfeeding mothers (p>0.001). In breastfeeding mothers, the rate of dental caries was 12.68, with 11.52 in non-breastfeeding mothers (p>0.05). The rates of white spots in breastfeeding and non-breastfeeding mothers were 1.64 and 0.88, respectively. The degree of CAL and the rate of GI were similar between the two groups of mothers Conclusion: Some periodontal indices (Pocket Depth and Bleeding on Probing) in lactating mothers were significantly higher than non-lactating mothers others (Clinical Attachment Level and Gingival Index) were similar. There were no significant differences in dental indices between lactating and non-lactating mothers. However, the rate of the white spot was more in the lactating group. Breastfeeding can be one of the risk factors in gingival inflammation and dental caries.

Artigo em Inglês | MEDLINE | ID: mdl-27429727


Background. Any decrease in friction between orthodontic wire and bracket can accelerate tooth movement in the sliding technique and result in better control of anchorage. This study was carried out to evaluate frictional forces by coating orthodontic wires and porcelain brackets with zinc oxide nanoparticles (ZnO). Methods . In this in vitro study, we evaluated a combination of 120 samples of 0.019×0.025 stainless steel (SS) orthodonticwires and 22 mil system edgewise porcelain brackets with and without spherical zinc oxide nanoparticles. Spherical ZnOnanoparticles were deposited on wires and brackets by immersing them in ethanol solution and SEM (scanning electronmicroscope) evaluation confirmed the presence of the ZnO coating. The frictional forces were calculated between the wiresand brackets in four groups: group ZZ (coated wire and bracket), group OO (uncoated wire and bracket), group ZO (coatedwire and uncoated bracket) and group OZ (uncoated wire and coated bracket). Kolmogorov-Smirnov, Mann-Whitney andKruskal-Wallis tests were used for data analysis. Results. The frictional force in ZZ (3.07±0.4 N) was the highest (P <0.05), and OZ (2.18±0.5 N) had the lowest amount of friction (P <0.05) among the groups. There was no significant difference in frictional forces between the ZO and OO groups (2.65±0.2 and 2.70±0.2 N, respectively). Conclusion . Coating of porcelain bracket surfaces with ZnO nanoparticles can decrease friction in the sliding technique,and wire coating combined with bracket coating is not recommended due to its effect on friction.

Eur J Oral Sci ; 124(1): 17-25, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26620628


A major and frequently encountered condition underlying the long-term programming effects of the intrauterine environment is exposure to stress. Gestational stress is an environmental factor that induces physical and behavioral alterations in offspring. Seventy female virgin Wistar rats were mated with one male rat for a maximum of four times, after which 52 pregnant rats were divided into two groups. In the experimental group the rats were exposed to restraint stress during pregnancy, whereas the control group did not receive the stress protocol. One male litter was randomly chosen from the offspring of each rat with 8-13 pups. A total of 40 male rat offspring were available for analysis. Thirty-one linear and angular measurements were analyzed in both study groups to investigate whether prenatal restraint stress changes the craniofacial growth pattern of rat offspring. In the prenatally stressed group, anterior cranial base length and viscerocranium measures were significantly increased compared with the control group, whereas cranial width, mandibular dimensions, and posterior cranial height and length remained unchanged. Furthermore, the prenatally stressed group showed backward rotation of the midface and decreased flattening of the cranial vault. It was concluded that prenatal chronic stress can induce alterations in the craniofacial growth pattern by promoting endochondral growth in the cranial base and nasal septum.

Anormalidades Craniofaciais , Animais , Feminino , Masculino , Gravidez , Efeitos Tardios da Exposição Pré-Natal , Ratos , Ratos Wistar , Estresse Psicológico
J Oral Maxillofac Surg ; 72(8): 1523-30, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24931106


PURPOSE: Compared with other maxillofacial lesions, oral and maxillofacial (OM) aneurysmal bone cysts (ABCs) are rare, and most studies have been case reports. Because the features or radiographic findings of 1 case could not be representative of the whole, conclusions cannot be drawn and data analyses will not be feasible. Our aim was to assess and describe the clinical and histopathologic characteristics of a large sample of subjects with ABCs. To our knowledge, the present case series of OM ABCs is the largest ever reported. MATERIALS AND METHODS: To address our research purpose, we designed and implemented a retrospective case series. A multicenter retrospective cohort study of patient charts dated from 1967 to 2013 (46 years) at 10 major universities in 8 cities was undertaken to assess OM ABCs nationwide. Subjects were included if they had documented chart data and definitive histopathologic slides confirming the diagnosis and treatment of ABC. They were excluded if their histopathologic slides did not confirm the diagnosis of an ABC. Data were collected, and special forms were completed. Variables such as age, gender, site (ie, maxilla, mandible, anterior, posterior), histologic type (ie, solid, mixed, vascular), signs, symptoms, radiographic features (ie, radiolucency, unicystic or multilocular), and outcomes (ie, treatment modal, recurrence, complications) of the lesion were evaluated and documented by OM surgeons and confirmed by OM pathologists for assurance. Data analyses were performed using Statistical Package for Social Sciences, version 20, software (SPSS, Chicago, IL) (P < .05). RESULTS: We assessed the medical records and histopathologic slides of 120 patients diagnosed and treated for OM ABCs nationwide. Of these patients, 69 were male (57.5%) and 51 were female (42.5%), with no predilection found. The key findings were as follows. The mean age of occurrence was 20.7 ± 2.5 years (range 4 to 78), and occurrence was significantly greater in the first 2 decades of life (P < .001). The incidence was 2.6 cases/year. ABCs were significantly more common in the mandible (P < .05) and posterior areas (P < .05). The most common histopathologic type was the mixed type (P < .05). Firm swelling was the most common clinical presentation (P < .05); all cases were radiolucent and commonly unilateral (P < .05). Most were treated by excision and curettage. Recurrence was reported in 11 patients (9.2%) during the follow-up period (1 to 45 years). CONCLUSIONS: The present retrospective cohort found ABCs with a variable presentation, disease course, and histopathologic type, with no gender predilection. ABCs were significantly more common in childhood and adolescence and in the mandible and posterior areas of the jaws. Of the cases reviewed, 90% were treated by excision and curettage. ABCs had a relatively low recurrence rate (<10%), precluding the need to perform aggressive surgery primarily.

Cistos Ósseos Aneurismáticos/patologia , Face/patologia , Maxila/patologia , Adolescente , Adulto , Idoso , Criança , Pré-Escolar , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos