Effects of maxillary protraction determined by laser metrology

Canut, José A.; Dalmases, F.; Gandía, José Luis; Salvador, Rosario

doi:10.1093/ejo/12.3.340

Cited by 9 publications

(4 citation statements)

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“…For minimal rotation of the maxilla during protraction, when the force is applied inferior to the occlusal plane, the effective point of force application has been reported to be at the lateral incisors ( Canut and Dalmases, 1990 ), the canines ( Nakano and Miura, 1980 ;Ngan et al , 1997 ), the fi rst premolar ( Proffi t, 1992 ;Ko and Kim, 1995 ), and the fi rst molars ( Tanne et al , 1989 ). In clinical research using cephalometric analysis, the displacement of ANS and point A in the group protracted with a separated midpalatal suture was found to be larger than in the group where a labiolingual appliance and protraction device was used ( Baik, 1995 ;Ngan et al , 1997 ;Baccetti et al , 1998 ;Filho et al , 1998 ;Saadia and Torres, 2000 ).…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional finite-element analysis of maxillary protraction with and without rapid palatal expansion

Baik

Sung

et al. 2007

The European Journal of Orthodontics

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The aims of this study were to determine the reaction of the craniofacial bones on the protraction force transferred to the maxillary body, and whether or not the midpalatal suture had opened during skeletal Class III treatment. A computerized tomograph was obtained from a dry skull with a normal occlusion to construct a three-dimensional finite-element model (3D.FEM) of the craniofacial bones and the maxillary teeth to simulate actual bone reactions. A protraction force of 500 g was applied at the first premolar region, directed 20 degrees inferior to the occlusal plane. The displacement and the stress distribution of the craniofacial bones and sutures were then calculated using the ANSYS 5.3 program dividing the analysis into two simulations, based on whether or not the midpalatal suture was opened. The results showed that there was less compressive stress and greater tensile stress in the circumaxillary suture areas when the midpalatal suture was opened. The amount of displacement and deformation when the midpalatal suture was opened also demonstrated a decrease in upward-forward rotation of the maxilla and zygomatic arch and greater amounts of displacement in the frontal, vertical, and lateral directions compared with no opening of the midpalatal suture. Analysis of these results showed that maxillary protraction produce similar changes to normal downward and forward growth of the maxilla and was achieved with accompanying opening of the midpalatal suture.

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Section: Discussionmentioning

confidence: 99%

Three-dimensional finite-element analysis of maxillary protraction with and without rapid palatal expansion

Baik

Sung

et al. 2007

The European Journal of Orthodontics

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“…Such research has also been coupled with cephalometric studies using metallic implants as radiographic reference markers to measure the relative displacement of the craniofacial bones and the effect of mechanical forces on craniofacial growth. In vitro studies have been conducted employing photoelastic (6, 7), strain gauge (8–11) and holographic (11, 12) techniques to characterize the mechanical behaviour of the craniofacial complex in response to the applied force system. Nevertheless, most of these techniques are limited in their ability to determine the actual sites of skeletal changes in a complicated structure such as the craniofacial complex.…”

Section: Introductionmentioning

confidence: 99%

Geometric morphometric assessment of treatment effects of maxillary protraction combined with chin cup appliance on the maxillofacial complex

Chang

Lin

Liu

et al. 2005

J of Oral Rehabilitation

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The aim of this study was to investigate the treatment effects on the maxillofacial complex by maxillary protraction combined with chin cup therapy among growing children. An effective geometric morphometric assessment of cephalometric radiographs, using Procrustes analysis and thin-plate spline analysis, was applied to evaluate shape change in the craniofacial and midfacial configurations of a treated sample of 20 children with skeletal Class III malocclusion. This was compared with matched untreated skeletal Class III controls. Marked treatment induced change involved the maxilla and the mandible. Major deformation consisted of forward advancement of the maxillary complex with negligible rotation of the palatal plane and a forward direction of growth of the mandibular condyle associated with a restriction in sagittal advancement of the chin. Considerable dentoalveolar components contributed to the correction of anterior crossbite. Further detailed study of skeletofacial remodelling in response to maxillary protraction in other skeletal components, including the cranial base and the mandibular complex that contribute to Class III skeletal discrepancies, is warranted.

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“…Clinical studies (5)(6)(7) reflecting the effect of maxillary protraction devices support these results. Also, experimental studies (8)(9) have shown anterior displacement of the maxilla by sutural modification of the circummaxillary sutures.…”

Section: Discussionmentioning

confidence: 99%

Esthetic Improvements With Maxillary Protraction Appliance in Class Iii Malocclusions

Ahmed¹,

Jahnavi²,

Shireen³

2015

jebmh

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This retrospective study was conducted to investigate the effect of treatment with a maxillary protraction appliance (MPA) on the maxilla and mandible. METHODS: Twelve patients (8 male and 4 female; mean age 10.3±1.12 years) with skeletal Class III malocclusion were included in this study and were evaluated by the use of lateral cephalograms obtained before and after treatment. Treatment changes were determined by means of linear and angular measurements. RESULTS: A significant increase in maxillary forward growth, inhibition of mandibular forward growth, and clockwise rotation of the mandible were observed. The maxillary incisors were significantly proclined and the mandibular incisors significantly retroclined. A multiple-regression analysis revealed that maxillary growth had a significant positive effect on the upper-airway dimension. CONCLUSIONS: Facilitation of maxillary growth with a maxillary protraction appliance can contribute to significant changes in the maxillary dimension and also an increase in the upper airway dimensions.

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Effects of maxillary protraction determined by laser metrology

Cited by 9 publications

References 0 publications

Three-dimensional finite-element analysis of maxillary protraction with and without rapid palatal expansion

Three-dimensional finite-element analysis of maxillary protraction with and without rapid palatal expansion

Geometric morphometric assessment of treatment effects of maxillary protraction combined with chin cup appliance on the maxillofacial complex

Esthetic Improvements With Maxillary Protraction Appliance in Class Iii Malocclusions

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