Avaliação cefalométrica comparativa dos efeitos dos aparelhos distalizadores Jones Jig, pêndulo e distal Jet - um estudo piloto / Comparative cephalometric evaluation of the effects of distalizing appliances Jones Jig, pendulum and distal jet - a pilot study

O objetivo deste estudo piloto foi avaliar e comparar os efeitos dentários, esqueléticos e nos tecidos moles de três aparelhos distalizadores intrabucais, a saber: Jones Jig, Pêndulo e Distal Jet. Foram selecionados 18 pacientes portadores de má oclusão de classe II dentária, com idade variável de 12,1 a 14,4 anos e divididos, randomicamente, em três grupos de 6 indivíduos.Cada grupo foi tratado com um dos aparelhos acima citados. Cefalogramas pré e pós-tratamento foram obtidos e as diferenças das medidas dentárias, esqueléticas e de tecidos moles foram analisadas pelo teste de Wilcoxon. Houve inclinação distal de coroa dos primeiros molares superiores com significância estatística (p<0,05) para o uso do Jones Jig (8,2º) e do Pêndulo (9,7º). Movimento distal efetivo dos primeiros e segundos molares, 3,3mm e 2,2mm, respectivamente, com significância estatística (p< 0,05) - foi observado apenas para o Distal Jet. Não houve movimento vertical dos molares nem movimento mesial dos pré-molares para nenhum dos três aparelhos. Da mesma forma, alterações esqueléticas e nos tecidos moles não apresentaram significância estatística. Entre os aparelhos testados, o Distal Jet foi o mais eficiente para corrigir a má oclusão de classe II dentária com a distalização efetiva dos primeiros molares superiores através do movimento de translação.

The aim of this pilot study was to evaluate and compare the dental effects, skeletal and soft tissue of three distalizing intraoral appliances, namely: Jones Jig, Pendulum and Distal Jet. We selected 18 patients with Class II malocclusion dental, aged 12.1 to 14.4 anos and divided randomly into three groups of six individuals. Each group was treated with one of the devices mentioned above. Cephalograms before and after treatment were obtained and differences in the measures dental, skeletal and soft tissues were analyzed by Wilcoxon test. There was a crown distal tipping of first molars with statistical significance (p<0.05) for the use of the Jones Jig (8.2 °) and the Pendulum (9.7 °). Effective distal movement of the first and second molars, 3.3 mm and 2.2 mm, respectively, with statistical significance (p<0.05) - it was observed only for the Distal Jet. There was no vertical movement of molars and neither mesial movement of premolars to none of the three devices. Likewise, skeletal and soft tissue changes were not statistically significant.Among the devices tested, the Distal Jet was the most efficient way to correct the Class II dental malocclusion through effective distalization of first molars with translation movement of these teeth.

Distalization of maxillary molar by Distal-Jet appliance / 实用口腔医学杂志

Objective:To evaluate the clinical effects of Distal-Jet appliance on the distalization of maxillary molar.Methods:12 Class Ⅱ malocclusion patients(at the average age of 12.3 years) with mesially moved maxillary molar were treated by Distal-Jet appliance. Cephalometic radiographs and dental models were taken and analyzed before and after molar distalization.Results:The treatment time was (4.3?2.8) months. After treatment following effects were achieved:①The maxillary molar was distalized by (3.6?0.75) mm per side with crown tilting distally by ( 3.5 ?3)?. ②The first premolar was moved mesially by (2.1?1.7) mm (tilting movement). Anterior overjet was increased by (1.47?1.76) mm. ③In the vertical dimension,the maxillary molar was extruded slightly by (0.39? 0.46 ) mm, the first premolar was extruded by (0.43?0.61) mm. ④The width between the central point of first maxillary molar was increased by ( 2.8 ?1.1) mm.Conclusions:The Distal-Jet appliance can distalize maxillary molars effectively. However,it may result in distaly tilting of molars and mesial movement of premolars.