The effect of activator treatment on Class II malocclusions

Wieslander, L; Lagerström, Lennart

doi:10.1016/0002-9416(79)90136-2

Cited by 154 publications

(79 citation statements)

References 20 publications

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“…15 Linear retrusion and lingual tipping of the maxillary incisors seem to be frequent findings also with other functional appliances. 18,22,[28][29][30][31] The different response of the incisors observed in the present study may relate to the fact that the present patients were younger and that the treatment took place during the period when the permanent incisors were erupting.…”

Section: Discussionmentioning

confidence: 99%

Dentofacial Changes after Orthodontic Intervention with Eruption Guidance Appliance in the Early Mixed Dentition

Keski-Nisula

Salo

et al. 2008

The Angle Orthodontist

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Objective: To evaluate skeletal and dentoalveolar changes induced by the eruption guidance appliance in the early mixed dentition. Materials and Methods: Pre-and posttreatment cephalometric radiographs of 115 consecutively treated children, 62 boys and 53 girls, were compared with those obtained from a control group of 104 children, 52 boys and 52 girls. Pretreatment radiographs were taken at the deciduousmixed dentition interphase (T1) and after full eruption of all permanent incisors and first molars (T2). The mean age of the children in both groups was 5.1 years at T1 and 8.4 years at T2. Results: A significant difference between the groups at T2 was found in the mandibular length, midfacial length, and maxillomandibular differential. The increase in mandibular length was 11.1 mm in the treatment group and 7.2 mm in the control group. No differences were found in measurements of maxillary position or size. There was a significant shift toward a Class I relationship in the treatment group. Labial tipping and linear protrusion of the mandibular incisors was evident in the treatment group at T2. There was no effect on the inclination or position of the maxillary incisors. Conclusions: Occlusal correction was achieved mainly through changes in the dentoalveolar region of the mandible. In addition, the appliance enhanced condylar growth resulting in a clinically significant increase in mandibular length. No effect was observed on maxillary position, maxillary size, inclination or protrusion of the maxillary incisors, or facial height.

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Section: Discussionmentioning

confidence: 99%

Dentofacial Changes after Orthodontic Intervention with Eruption Guidance Appliance in the Early Mixed Dentition

Keski-Nisula

Salo

et al. 2008

The Angle Orthodontist

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“…Change in molar relationship is generally considered to result from effects on the maxillary skeletal complex and the upper and lower dentition; whether there is skeletal adaptation in the condyles is still undecided. Whereas most cephalometric studies in humans (Jakobsson, 1967;Trayfoot and Richardson, 1968;Harvold and Vargervik, 1971;Dietrich, 1973;Woodside et al, 1975;Wieslander and Lagerstrom, 1979) indicate that mandibular growth is not altered by the activator, histological evidence (Stockli and Willert, 1971) and cephalometric evidence (McNamara, 1972) seem to indicate that it can be stimulated in animals.…”

Section: Introductionmentioning

confidence: 99%

Effects of activator treatment - evidence for the occurrence of two different types of reaction

Luder

1981

The European Journal of Orthodontics

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Summary. A longitudinal cephalometric study was made of 12 boys and 13 girls with Class 11, Division 1 malocclusion treated with activators. The findings were compared with an untreated control group of 24 boys and 15 girls. The children were aged about 9 years at the start of the investigation and they were treated, or observed, for about two years.Possible alterations of mandibular condylar growth were investigated and the results were compared with previously published hypotheses on the mode of action of the activator.Since there were significant differences in the growth increments of control boys and control girls, the sexes were treated statistically as separate groups. Mandibular growth was found to be altered by activator therapy; in the boys growth was increased and redirected posteriorly while in the girls growth was only redirected. The maxilla and the dental arches were differently affected by the treatment. The differences in the observed results are probably explained by variation in the amount of vertical activation of the appliance but the possibility that boys and girls generally react differently could not be excluded.

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“…Contudo, as modificações no complexo côndilo-fossa, favoráveis à correção da má oclusão de Classe II e observadas por VOUDOURIS et al 191,192 45,52,59,78,90,133,191,196,197 . • Má oclusão de Classe II completa bilateral, tratada sem extrações ou com extrações de dois pré-molares superiores e dois inferiores;…”

Section: Tratamento Ortodôntico Da Má Oclusão De Classe II Com E Semunclassified

Estudo comparativo do tempo de tratamento de casos com má oclusão de classe II tratados ortodonticamente com extrações de quatro pré-molares e sem extrações

Valarelli¹

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The effect of activator treatment on Class II malocclusions

Cited by 154 publications

References 20 publications

Dentofacial Changes after Orthodontic Intervention with Eruption Guidance Appliance in the Early Mixed Dentition

Dentofacial Changes after Orthodontic Intervention with Eruption Guidance Appliance in the Early Mixed Dentition

Effects of activator treatment - evidence for the occurrence of two different types of reaction

Estudo comparativo do tempo de tratamento de casos com má oclusão de classe II tratados ortodonticamente com extrações de quatro pré-molares e sem extrações

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