Changes concurrent with orthodontic treatment when maxillary expansion is a primary goal

Ladner, Paul T.; Muhl, Z.F.

doi:10.1016/s0889-5406(95)70082-x

Cited by 52 publications

(36 citation statements)

References 20 publications

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“…1 The quad helix expander is designed to work more slowly than a rapid maxillary expander, and its construction is less rigid. 2 Undesired side effects of palatal expansion that may occur include the extrusion of maxillary molar teeth and an increased vertical dimension. 1,[3][4][5][6] Both rapid maxillary expansion with a bonded expander and slow palatal expansion with a quad helix expander have been thought to minimize vertical changes following expansion, which is important for patients who have an increased anterior facial height and/or an increased mandibular plane angle prior to orthodontic treatment.…”

Section: Introductionmentioning

confidence: 99%

Assessment of vertical changes during maxillary expansion using quad helix or bonded rapid maxillary expander

Conroy-Piskai

Galang‐Boquiren

Obrez

et al. 2016

The Angle Orthodontist

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Objective: To determine if there is a significantly different effect on vertical changes during phase I palatal expansion treatment using a quad helix and a bonded rapid maxillary expander in growing skeletal Class I and Class II patients. Materials and Methods: This retrospective study looked at 2 treatment groups, a quad helix group and a bonded rapid maxillary expander group, before treatment (T1) and at the completion of phase I treatment (T2). Each treatment group was compared to an untreated predicted growth model. Lateral cephalograms at T1 and T2 were traced and analyzed for changes in vertical dimension. Results: No differences were found between the treatment groups at T1, but significant differences at T2 were found for convexity, lower facial height, total facial height, facial axis, and Frankfort Mandibular Plane Angle (FMA) variables. A comparison of treatment groups at T2 to their respective untreated predicted growth models found a significant difference for the lower facial height variable in the quad helix group and for the upper first molar to palatal plane (U6-PP) variable in the bonded expander group. Conclusion: Overall, both the quad helix expander and the bonded rapid maxillary expander showed minimal vertical changes during palatal expansion treatment. The differences at T2 suggested that the quad helix expander had more control over skeletal vertical measurements. When comparing treatment results to untreated predicted growth values, the quad helix expander appeared to better maintain lower facial height and the bonded rapid maxillary expander appeared to better maintain the maxillary first molar vertical height. (Angle Orthod. 2016;86:925-933)

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Section: Introductionmentioning

confidence: 99%

Assessment of vertical changes during maxillary expansion using quad helix or bonded rapid maxillary expander

Conroy-Piskai

Galang‐Boquiren

Obrez

et al. 2016

The Angle Orthodontist

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“…Prior research 8,[20][21][22][23] utilized dental casts, twodimensional lateral and posteroanterior cephalograms, and occlusal radiographs to assess the effect of palatal expanders. Although these studies were able to measure changes in the facial complex, a more accurate evaluation of the dento-skeletal changes is now available.…”

Section: Introductionmentioning

confidence: 99%

“…In the past, the effects of maxillary expansion on nasal respiration were measured utilizing rhinometry and linear measurements of the maxillary sinus on highradiation CT scans. 20,21 With the utilization of CBCT technology it is possible to measure the maxillary sinus volume and anterior and posterior airway and to quantify craniofacial structural changes in three dimensions with minimal distortion and lower radiation doses than are required for conventional CT scans. 18,[24][25][26][27][28] The purpose of this study was to assess three dimensionally, with the aid of ICAT technology (Imaging Sciences International, Hatfield, Pa), the skeletal, dental, and volumetric changes of the maxillary sinus that occur with the banded hyrax expander vs the bonded hyrax expander.…”

Section: Introductionmentioning

confidence: 99%

Cone beam computed tomography evaluation of changes in the naso-maxillary complex associated with two types of maxillary expanders

Pangrazio-Kulbersh

Wine

Haughey

et al. 2012

The Angle Orthodontist

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Objective: To test the hypothesis that there were no differences in the skeletal and dental effects of banded vs bonded expanders when evaluated using cone beam computed tomography (CBCT). Materials and Methods: The experimental sample consisted of 23 patients: 13 (seven male, six female; mean age 5 12.6 61.8 years) and 10 (five male, five female; mean age 5 13.5 6 2.1 years) treated with banded and bonded maxillary expanders, respectively. CBCT images were taken at T1 (pretreatment) and T2 (immediately after expansion) to evaluate the changes in the naso-maxillary complex. Relationships between and within groups were assessed using analysis of variance. If the results were significant, post hoc t-tests were used to determine where the significant differences occurred. Results: Regardless of the appliance, the maxilla was expanded equally at the level of the canines and first and second premolars. At the level of the first molars, more dental tipping and alveolar bending were evident in the banded expander group. Both appliances equally increased the skeletal and soft tissue dimensions of the nasal cavity and maxillary sinus volume. The posterior airway volume did not significantly change with either method of expansion. Conclusions: The hypothesis was rejected. Both appliances expanded the maxilla similarly. However, in the banded group, more dental tipping and alveolar bending occurred at the level of the first molars. Maxillary expansion affected the palatal suture and demonstrated anterior and posterior skeletal widening of the nasal cavity, with corresponding soft tissue changes and increased airway volume. (Angle Orthod. 2012;82:448-457.)

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“…Hass also reported the forces produced by this appliances as ranging from 3 to 10 pounds. 21 The displacement in the holographic study is recorded in nanometers. Hence, it cannot be quantitatively compared to the forces produced clinically.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Reaction of Facial Skeleton to Rapid Palatal Expansion Devices using Laser Holography: An in vitro Study

Peddu

Maheswari

Mallavarapu

et al. 2013

JIOS

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Changes concurrent with orthodontic treatment when maxillary expansion is a primary goal

Cited by 52 publications

References 20 publications

Assessment of vertical changes during maxillary expansion using quad helix or bonded rapid maxillary expander

Assessment of vertical changes during maxillary expansion using quad helix or bonded rapid maxillary expander

Cone beam computed tomography evaluation of changes in the naso-maxillary complex associated with two types of maxillary expanders

Mechanical Reaction of Facial Skeleton to Rapid Palatal Expansion Devices using Laser Holography: An in vitro Study

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