Maxillary expansion: Clinical implications

Bishara, Samir E.; Staley, Robert N.

doi:10.1016/0889-5406(87)90202-2

Cited by 432 publications

(408 citation statements)

References 31 publications

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“…Among them, the one that evaluated the extrusion of the upper incisor (sagittal parameter 2) deserves more emphasis. Group 1 showed a numerically significant increase, demonstrating that a possible dental extrusion movement occurred in the upper right incisor, which is in accordance with the literature (BISHARA; STALEY, 1987;SARVER, 803 Cone-beam computed… ALMEIDA, G. A. et al JOHNSTON, 1989). However, this was not statistically significant.…”

Section: Discussionsupporting

confidence: 80%

“…It was noted that these increases were higher than those reported by the measurement of coronal parameter 1. This effect demonstrates a decrease of the magnitude of the maxillary expansion in the direction of the occlusion of the maxillary basal area, according to the literature (BISHARA; STALEY, 1987;SARVER, JOHNSTON, 1989). These increases were statistically significant in both groups.…”

Section: Discussionsupporting

confidence: 49%

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Cone-beam computed tomography evaluation of dentoskeletal effects produced by the bonded expander and hyrax: a pilot study

et al. 2016

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ABSTRACT:The dentoskeletal effects produced by the bonded expander, principally the vertical ones, are controversial in the literature when compared with the effects produced by the hyrax, and have also been scarcely studied by means of cone-beam computed tomography (CBCT). This study aimed to evaluate the horizontal and vertical dentoskeletal effects produced by the bonded expander and by the hyrax using CBCT. The study sample consisted of ten patients, divided equally into two groups according to facial and cephalometric features: group 1, vertical facial growth pattern (two males, three females; mean age, 7.7 years) and group 2, normal facial growth pattern (three males, two females; mean age, 8.3 years), treated by bonded expander and hyrax, respectively. The patients were subjected to a CBCT scan before expansion and another scan four months after the end of the activations, when the expander was removed. Within each group and between the groups the horizontal and vertical effects were assessed using Student's t-test. The sample size was predetermined, and 5 patients were needed in each group to detect the differences at P < 0.05 with 90% power. Among the horizontal changes assessed, the nasal floor width (P = 0.03) and the greater internal width in the posterior region (P = 0.00) showed a statistically significant increase only for group 1, and the mandibular molar verticality showed a statistically significant increase only for group 2. The vertical changes showed no statistical differences within groups (P > 0.05). Comparing the two groups there were no statistical differences for any assessed change (P > 0.05). Considering there were no differences of the effects between the appliances, the bonded expander produced no greater vertical control compared to the hyrax. Nevertheless, further study is recommended in a larger sample size using CBCT.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 49%

Cone-beam computed tomography evaluation of dentoskeletal effects produced by the bonded expander and hyrax: a pilot study

et al. 2016

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“…T he skeletal correction of transverse maxillary deficiency is difficult via orthodontics and orthopedics after 18 years of age and is successful until the age of approximately 13-15 yearsdepending on the gender of the patient [1,2]. After the skeletal maturity, orthodontic treatment alone cannot provide stable widening of constricted maxilla.…”

Section: Introductionmentioning

confidence: 99%

Surgically Assisted Maxillo-mandibular Transverse Expansion

Kamat¹,

Chowdhury²,

Jayan

et al. 2010

Medical Journal Armed Forces India

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“…Because these sutures are orientated in the sagittal plane and not in the vertical plane one would suppose that there is more resistance to the forces applied during transverse orthopaedic correction than during sagittal orthopaedic correction: this could be a reason in favour of the use of heavy forces to expand the maxilla. It is also well known that the major resistance to expansion is not the mid-palatal suture itself, but the other sutures of the maxilla (Bishara and Staley, 1987). The easiest technical way to apply transversal forces on the maxilla is the jackscrew and this is probably the reason for its large clinical use even though the forces applied are too heavy.…”

Section: Lateral Cephalogramsmentioning

confidence: 99%

“…It has been proved that the major resistance to maxillary expansion does not come from the mid-palatal suture, but from the other sutures of the maxilla (Isaacson and Ingram, 1964;Zimring and Isaacson, 1965;Bishara and Staley, 1987).…”

Section: Introductionmentioning

confidence: 99%

Light maxillary expansion forces with the magnetic expansion device. A preliminary investigation

Darendeliler

Strahm

1994

The European Journal of Orthodontics

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SUMMARY An active maxillary magnetic expansion device (MED) was developed to be used clinically. The aim was to show the effects of light and continuous forces producing less traumatic stimulation of maxillary sutural growth than a conventional rapid maxillary expansion device.In this study, two different types of appliances were used on six patients between 7 years 4 months and 16 years 2 months: the first type was bonded, the other one used bands. For better appreciation, four implants were placed on each patient: two apically between central and lateral incisors, and two between second premolars and molars. A standardized radiographic technique was used to take occlusal radiographs, and postero-anterior and lateral headplates. The results varied according to the age and the appliance used. The skeletal effect with the banded MED was between 16 and 77 per cent, and for the bonded MED 0 and 25 per cent in comparison to the overall expansion.It seems that 250-500 g of continuous magnetic forces can produce dental and skeletal movements in a light force expansion concept, but further studies with larger samples are needed to make firm conclusions.

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Maxillary expansion: Clinical implications

Cited by 432 publications

References 31 publications

Cone-beam computed tomography evaluation of dentoskeletal effects produced by the bonded expander and hyrax: a pilot study

Cone-beam computed tomography evaluation of dentoskeletal effects produced by the bonded expander and hyrax: a pilot study

Surgically Assisted Maxillo-mandibular Transverse Expansion

Light maxillary expansion forces with the magnetic expansion device. A preliminary investigation

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