Expansion of the lower arch concurrent with rapid maxillary expansion

Sandstrom, Robin A.; Klapper, Lewis; Papaconstantinou, Stavros D.

doi:10.1016/0889-5406(88)90054-6

Cited by 60 publications

(26 citation statements)

References 8 publications

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“…In comparison to the study by Ngan et al 17) , changes in mandibular width at the deciduous molars seemed to be larger in our present study, likely due to differences in treatment duration and/or the amount of maxillary dental arch expansion. Other studies have shown short-term changes in intermolar width on the mandibular first molar in response to rapid maxillary expansion; a 3.3 mm increase was reported by Sandstrom et al 5) , a 2.0-mm increase by Moussa et al 6) , and a 0.97 mm increase by Lima et al 7) . The results were variable, but the increase of 2.0 mm in this study was within the range of those reported previously.…”

Section: Discussionmentioning

confidence: 87%

“…Many studies have reported increases in the transverse width of the maxillary dental arch by rapid maxillary expansion as a result of combined skeletal and dentoalveolar expansion [1][2][3][4] . Several studies have investigated changes in the mandibular dental arch concurrent with rapid maxillary expansion, and increases in the mandibular arch width in response to maxillary expansion have been reported 1,2,[5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

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Occlusal and Skeletal Changes induced by Protraction Facemask combined with Slow Maxillary Expansion

Tamaoki

Ishikawa

Hata

et al. 2017

J. Hard Tissue Biology.

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The objective of this study was to investigate spontaneous changes in the mandibular intermolar widths concurrent with protraction facemask treatment combined with slow maxillary expansion in skeletal Class III children, and to evaluate whether slow expansion has favorable effects on maxillary protraction. Twenty-three patients were divided into expansion and non-expansion groups. The expansion group comprised 11 children (mean age, 6.9 ± 1.0 years) who underwent protraction facemask treatment combined with slow maxillary expansion. The non-expansion group consisted of 12 children (mean age, 7.8 ± 1.1 years) who underwent protraction only. Dental casts and lateral cephalograms obtained before and after protraction were used to analyze occlusal and skeletal changes during approximately 1 year of treatment. The expansion group showed significantly larger increments than the non-expansion group in all mandibular intermolar measures (P < .01). No significant differences in skeletal changes were seen for any cephalometric measures between groups. In conclusion, spontaneous increases in mandibular intermolar widths were found during maxillary protraction combined with slow expansion treatment. No favorable skeletal effects of slow expansion on protraction were confirmed.

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Section: Discussionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Occlusal and Skeletal Changes induced by Protraction Facemask combined with Slow Maxillary Expansion

Tamaoki

Ishikawa

Hata

et al. 2017

J. Hard Tissue Biology.

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“…This relatively efficient RME may reflect the concurrent expansion of the lower arch. 38 The positioning of the upper molar cusp in the lower molar fossa may have minimized relapse of maxillary expansion.…”

Section: Discussionmentioning

confidence: 99%

CBCT of skeletal changes following rapid maxillary expansion to increase arch-length with a development-dependent bonded or banded appliance

Kanomi

Deguchi

Kakuno

et al. 2013

The Angle Orthodontist

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Objective: To assess the three-dimensional (3D) skeletal response to a standardized 5 mm of rapid maxillary expansion (RME) in growing children (6-15 years) with maxillary width deficiency and crowding. Materials and Methods: A bonded appliance was used prior to the eruption of the maxillary first premolars (Mx4s), and a banded appliance was used thereafter. A consecutive sample of 89 patients (29 boys and 60 girls) from a large pediatric dentistry and orthodontics practice was divided into four groups: 1) 6-8 years old (n 5 26), 2) 9-11 years old with unerupted Mx4s (n 5 21), 3) 9-11 years with erupted Mx4s (n 5 23), and 4) 12-15 years (n 5 19). For all patients, the 3D evaluation of dental and skeletal effects was performed with cone-beam computed tomography (CBCT). Results: For both appliances in all patients, CBCT confirmed a triangular pattern of expansion in both the frontal and sagittal planes. Overall, both appliances produced significant maxillary expansion (.80% of the 5-mm activation), but older children showed a progressively more dental (less skeletal) response. Comparison of the two types of expanders in the crossover sample, children aged 9-11 years, showed that the bonded RME produced the most efficient skeletal expansion in the preadolescent sample. Increased maxillary width at the level of the zygomaticomaxillary suture was the best indicator for development of maxillary arch circumference. Conclusion: Development-dependent appliances (bonded RPE before Mx4s erupt, and a banded device thereafter) provided optimal RME treatment for all children from age 6-15 years. (Angle Orthod. 2013;83:851-857.)

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“…He found a small gain in the mandibular intermolar width, but the mandibular intercanine width did not increase significantly. Sandstrom et al 17 reported the long-term results after 2 years of retention. After RME and fixed appliance therapy, they reported statistically significant increases for intercanine and intermolar widths.…”

Section: Discussionmentioning

confidence: 99%

Changes in mandibular transversal arch dimensions after rapid maxillary expansion procedure assessed through cone-beam computed tomography

et al. 2011

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Objective: This study aimed at evaluating the changes in mandibular arch widths and buccolingual inclinations of mandibular posterior teeth after rapid maxillary expansion (RME). Methods: Baseline and post-expansion cone-beam computed tomographic (CBCT) images of patients who initially had bilateral posterior cross-bite and underwent RME with a banded-type expander were assessed in this study. The patients included 9 boys (mean age: 13.97 ± 1.17 years) and 11 girls (mean age: 13.53 ± 2.12 years). Images obtained 6 months after retention were available for 10 of these patients. Eighteen angular and 43 linear measurements were performed for the maxilla and mandible. The measurements were performed on frontally clipped images at the following time points; before expansion (T1), after expansion (T2), and after retention (T3). Statistical significance was assessed with paired sample t-test at p ＜ 0.05. Results: T1-T2 comparisons showed statistically significant post-RME increases for all measurements; similarly, T2-T1 and T3-T1 comparisons showed statistically significant changes. The maxillary linear and angular measurements showed decreases after expansion, and mandibular linear and angular measurements increased after retention. Conclusion: All mandibular arch widths increased and mandibular posterior teeth were uprighted after RME procedure.

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Expansion of the lower arch concurrent with rapid maxillary expansion

Cited by 60 publications

References 8 publications

Occlusal and Skeletal Changes induced by Protraction Facemask combined with Slow Maxillary Expansion

Occlusal and Skeletal Changes induced by Protraction Facemask combined with Slow Maxillary Expansion

CBCT of skeletal changes following rapid maxillary expansion to increase arch-length with a development-dependent bonded or banded appliance

Changes in mandibular transversal arch dimensions after rapid maxillary expansion procedure assessed through cone-beam computed tomography

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