RESUMO
OBJECTIVE: Evaluate dental and skeletal changes resulting from the exclusive use of the cervical headgear for 15 ± 4 months in the treatment of patients with Class II division 1 malocclusion. METHODS: Differences between the beginning (T1) and immediately after the end of the therapy (T2) with the cervical headgear in growing patients (Experimental Group, EG, n = 23) were examined and compared, during compatible periods, with those presented by a group of untreated individuals (Control Group, CG, n =22) with similar malocclusions and chronological age. The cephalometric variables evaluated were: ANB, GoGn.SN, AO-BO, S'-ANS, S'-A, S'-B, S'-Pog and S'-U6 (maxillary first molar). The Shapiro-Wilk and Levene tests were used to evaluate the results. RESULTS: Significant differences were found relative to the ANB, S'-U6, AO-BO, S'-ANS, S'-A, S'-B and S'-Pog variables between T1 and T2 when comparing both groups. No statistically significant variation was found regarding the GoGn.SN angle. CONCLUSIONS: The use of cervical headgear promoted distal movement of the maxillary first molars and restricted the anterior displacement of the maxilla, without significantly affecting the GoGn.SN angle.
Assuntos
Má Oclusão Classe II de Angle , Cefalometria , Aparelhos de Tração Extrabucal , Humanos , Maxila , Dente Molar , Estudos ProspectivosRESUMO
AIM: The aim of this in vitro study was to observe and compare the microstructure of the adhesive interface between resin and dentin treated with Papacarie® using scanning electron microscopy (SEM). MATERIALS AND METHODS: Totally, 10 human dentin slabs were randomly distributed into two groups. The control group (n = 5) was subjected to etching with 37% phosphoric acid for 20 s and washed for 30 s, dried with absorbent paper, and the bonding agent was applied along with low viscosity resin. In turn, the experimental group (n = 5) was subjected to the same procedure, but Papacarie® (Fσrmula and Aηγo, Sγo Paulo, Brazil) was added for 30 s prior to etching. Adper™ Single Bond 2 (3M ESPE, Sγo Paulo, Brazil) adhesive was applied to both groups following manufacturer instructions. The specimens were prepared for observation under SEM with ×1.000, ×2.000, ×2.200 and ×5.000 magnification. The micrographs were evaluated with respect to the formation of the hybrid layer, thickness, shape and length of the tags and microtags. RESULTS: In the experimental group there was the formation of more fine hybrid layer and tags with average of similar length to the control group; microtags in less number and without formation of lateral branches. The resin tags presented conical, smooth and uniform characteristics. CONCLUSIONS: When Papacarie® was used prior to the application of a bonding agent it could interfere with the formation of the hybrid layer without changing the length of the tag. Moreover, the morphology in the experimental group was found to be more uniform and regular.
Assuntos
Bis-Fenol A-Glicidil Metacrilato/química , Adesivos Dentinários/química , Dentina/ultraestrutura , Papaína/química , Condicionamento Ácido do Dente , Dente Pré-Molar , Resinas Compostas/química , Colagem Dentária , Géis , Humanos , Técnicas In Vitro , Teste de Materiais , Microscopia Eletrônica de Varredura , Ácidos Fosfóricos/química , Propriedades de SuperfícieRESUMO
Objetivou-se com este trabalho relatar o tratamento de um paciente portador de maloclusäo Classe II, 1ª Divisäo (Angle). Foi utilizado um aparelho extraoral com traçäo alta em associaçäo com aparelho fixo (sistema edgewise). Após análise dos resultados chegou-se à conclusäo de que esta mecânica é eficiente para obtençäo de resultados satisfatórios ao final do tratamento