Class II malocclusion treatment using high-pull headgear with a splint: a systematic review

Objective: To systematically review the scientific evidence pertaining to the effectiveness of high-pull headgear in growing Class II subjects. Methods: A literature survey was performed by electronic database search. The survey covered the period from January 1966 to December 2008 and used Medical Subject Headings (MeSH). Articles were initially selected based on their titles and abstracts; the full articles were then retrieved. The inclusion criteria included growing subjects between 8 to 15 years of age, Class II malocclusion treatment with high-pull headgear, and a control group with Class II malocclusion. References from selected articles were hand-searched for additional publications. Selected studies were evaluated methodologically. Results: Four articles were selected; none were randomized controlled trials. All of the articles clearly formulated their objectives and used appropriate measures. The studies showed that high-pull headgear treatment improves skeletal and dental relationship, distal displacement of the maxilla, vertical eruption control and upper molars distalization. One of the studies showed a slight clockwise rotation of the palatal plane; the others showed no significant treatment effect. The mandible was not affected by the treatment. Conclusion: While there is still a lack of strong evidence demonstrating the effects of high-pull headgear with a splint, other studies indicate that the AP relations improve due to distalization of the maxilla and upper molars, with little or no treatment effects in the mandible. Greater attention to the design should be given to improve the quality of such trials. © 2013 Dental Press Journal of Orthodontics.

The systematic significance of floral morphology, nectaries, and nectar concentration in epiphytic cacti of tribes Hylocereeae and Rhipsalideae (Cactaceae)

A long-standing interest in cactus taxonomy has existed since the Linnaean generation, but an appreciation of the reproductive biology of cacti started early in the 1900s. Numerous studies indicate that plant reproductive traits provide valuable systematic information. Despite the extensive reproductive versatility and specializations in breeding systems coupled with the striking floral shapes, the reproductive biology of the Cactaceae has been investigated in approximately 10% of its species. Hence, the systematic value of architectural design and organization of internal floral parts has remained virtually unexplored in the family. This study represents the most extensive survey of flower and nectary morphology in the Cactaceae focusing on tribes Hylocereeae and Rhipsalideae (subfamily Cactoideae). Our objectives were (1) to conduct comparative morphological analyses of flowers and floral nectaries and (2) to compare nectar solute concentration in these two tribes consisting of holo- and semi-epiphytic species. Flower morphology, nectary types, and sugar concentration of nectar have strong taxonomic implications at the tribal, generic and specific levels. Foremost, three types of nectaries were found, namely chamber nectary (with the open and diffuse subtypes), furrow nectary (including the holder nectary subtype), and annular nectary. All Hylocereeae species possess chamber nectaries, in which the nectarial tissue has both trichomes and stomata. The Rhipsalideae are distinguished by two kinds of floral nectaries: furrow and annular, both nectary types with stomata only. The annular nectary type characterizes the genus Rhipsalis. Nectar concentration is another significant taxonomic indicator separating the Hylocereeae and Rhipsalideae and establishing trends linked to nectar sugar concentration and amount of nectar production in relation to flower size. There is an inverse relationship between flower size and amount of nectar production in the smaller Rhipsalideae flowers, in which nectar concentration is more than two-fold higher despite the smaller volume of nectar produced when compared to the large Hylocereeae flowers. Variability of nectary morphology and nectar concentration was also evaluated as potential synapomorphic characters in recent phylogenies of these tribes. In conclusion, our data provide strong evidence of the systematic value of floral nectaries and nectar sugar concentration in the Cactaceae, particularly at different taxonomic levels in the Hylocereeae and Rhipsalideae. © 2013 Perspectives in Plant Ecology, Evolution and Systematics.

Realidade virtual aplicada à ergonomia por meio do design participativo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Antropometria das extremidades dos membros inferiores de obesos: parâmetros para o desing ergonômico de calçados

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O Design nos jogos geométricos aplicados ao ensino infantil

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Design da notícia: o desenvolvimento da indústria gráfica e a comunicação visual no Jornal Diário

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Design com identidade: por meio de estudos sócio-culturais e dos signos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação de força de torção manual infantil: o design ergonômico aplicado ao desenvolvimento de tampas seguras para embalagens de domissanitários

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Design de superfície: por uma visão projetual geométrica e tridimensional

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Subjetividade e complexidade em design: um mapeamento acerca do design de relações

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise da percepção de desconforto/conforto e antropometria em calçados femininos: uma abordagem do design ergonômico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Assento adaptável para pessoas com paralisia cerebral e seqüela de escoliose: aplicando ergonomia por meio do design - num estudo de caso

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo da interface e aplicação dos materiais mimétricos ao design de produto e segurança do trabalho

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O design de brinquedos voltado para as crianças com deficiência visual

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Vitrina, design e emoção: uma investigação sobre a percepção visual feminina

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)