Comparison between rapid and mixed maxillary expansion through an assessment of arch changes on dental casts

Grassia, Vincenzo; d’Apuzzo, Fabrizia; Jamilian, Abdolreza; Femiano, F; Favero, Lorenzo; Perillo, Letizia

doi:10.1186/s40510-015-0089-6

Cited by 25 publications

(25 citation statements)

References 28 publications

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“…The measurements recorded in the present study were demonstrated to be reliable by the small error of the method, and the use of photographs or scanned images for this kind of measurement was already validated by other authors ( 26 , 33 , 34 ). The main limitation of the present study was its retrospective design, but care was taken during the case selection process by rigidly following a time interval criterion to select only consecutive cases, thus reducing the risk of selection bias.…”

Section: Discussionsupporting

confidence: 75%

Expansion of permanent first molars with rapid maxillary expansion appliance anchored on primary second molars

et al. 2018

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BackgroundTo evaluate how the amount of expansion of the primary second molars, the patient’s age, and the skeletal maturation stage influence the amount of expansion at the level of the permanent first molars.Material and MethodsFifty-five patients aged between 6 and 11 years with a cervical vertebral maturation stage of CS1 or CS2 were retrospectively selected. The intermolar width was measured before and after expansion to evaluate the amount of expansion achieved at the level of the primary second molars and the permanent first molars. Stepwise multiple linear regression was used to evaluate how the amount of primary molars expansion, the patient’s age, and the cervical vertebral maturation stage predict the amount of permanent molar expansion.ResultsA significant regression equation was found, and for every 1 mm of primary molar expansion, 0.91 mm of permanent molar expansion can be expected. An age between 6 and 11 years and the CS1 or CS2 skeletal maturation stage were not significant predictors of permanent molar expansion.ConclusionsA rapid maxillary expansion appliance anchored on primary second molars is effective in expanding the permanent molars to correct a transverse maxillary deficiency in prepubertal patients, transferring the risks associated with the large forces used to the primary teeth. Key words:Maxillary expansion, transversal deficiency, primary molars.

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Section: Discussionsupporting

confidence: 75%

Expansion of permanent first molars with rapid maxillary expansion appliance anchored on primary second molars

et al. 2018

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“…Individuals with smaller maxillary basal bone, particularly in the anterior region, are at 22,23 as are compensations of the mandibular dentition following maxillary expansion. 24,25 These associations help to partially explain why expansion of maxillary basal bone alone, without any other conjunctive treatment, decreases mandibular crowding. 26 Importantly, maxillary apical base size explained 25% of individual differences in maxillary crowding and only 10% of the variation in mandibular crowding.…”

Section: Discussionmentioning

confidence: 99%

Is there a relationship between dental crowding and the size of the maxillary or mandibular apical base?

Crossley¹,

Campbell

Tadlock

et al. 2019

The Angle Orthodontist

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Objective: To determine whether apical base size is related to dental crowding. Materials and Methods: Digital scans of dental casts were taken of 75 untreated Class I adults to measure maxillary and mandibular tooth size, dental arch perimeters, intermolar widths, and intercanine widths. Cone beam computed tomography (CBCT) images were used to measure the apical base of the maxilla and mandible, including the total cross-sectional area, five basal arch perimeters and five basal arch widths. Principal components factor analyses were performed to evaluate the relationships between the apical base size and tooth-size-arch-length discrepancies (TSALD). Results: The dental arch and maxillary apical base measures were significantly larger in males than females. There were only limited sex differences in mandibular apical base size. The dental arch measurements were smaller in subjects with greater upper and lower TSALD. Maxillary and mandibular apical base dimensions were positively interrelated. Low-to-moderate correlations were found between the size of the maxillary apical base and TSALD. The size of the mandibular apical base was not related to upper or lower TSALD. Tooth size showed little to no relationship with TSALD. Conclusions: Although maxillary apical base size is related to maxillary and mandibular crowding in subjects with Class I malocclusion, mandibular apical base size is not.

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“…RME has many effects on the nasomaxillary complex other than transverse maxillary expansion and correction of crossbites. Effects of RME were studied on skeletal transverse, vertical and anteroposterior position of the nasomaxillary structures [84], [85], maxillary and mandibular transverse arch dimensions [86], [87], upper airway dimensions [88], [89], bite force, changes in the masticatory cycle and occlusal force distribution [90], swallowing [25] and condylar response [91], [92], [93], changes in head posture and scapular position, natural head position [94], enamel demineralization and white spot lesion formation [23], [57], hearing loss [95], [96], nocturnal enuresis [21], [97], [98], eruption of 3 rd molars [55], Class ll div1 [99], speech and voice function [58], [100], [101], obstructive sleep apnea(102), tongue posture [103] and Holdaway soft tissue analysis [104]. Effects of RME have also been studied on basal bone changes even in the absence of crossbites [105].…”

Section: Discussionmentioning

confidence: 99%

Transverse Skeletal Effects of Rapid Maxillary Expansion in Pre and Post Pubertal Subjects: A Systematic Review

Seifeldin

Elkordy

Fayed

et al. 2019

Open Access Maced J Med Sci

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OBJECTIVE: The aim of this systematic review was to assess the transverse skeletal effects of rapid maxillary expansion (RME) in pre and post-pubertal subjects. MATERIAL AND METHODS: Five databases were searched till May 2018; Pubmed, Cochrane, Scopus, Lilacs and Web of science in addition to the manual search of other sources. There were no language restrictions. Methodological Index for Non-Randomized Studies MINORS was used to assess the quality and risk of bias of the trials included. RESULTS: Six studies were finally included in the qualitative analysis. A meta-analysis wasn’t performed due to the heterogeneity of methodologies and outcomes. All of the included studies showed drawbacks in their structure yielding weak evidence. On the short term, RME caused an increase in the maxillary and lateral-nasal widths in pre-pubertal subjects by 3.4 mm and 3.3 mm, and by 2.8 and 2.2 mm respectively in post-pubertal subjects. Although statistically insignificant, the maxillary width increase was more than that of the post-pubertal subjects by 0.6 mm. Over the long term, expansion produced permanent increases in the transverse dimensions of both the dento-alveolar and skeletal components of the maxilla and circum-maxillary structures in pre-pubertal subjects. The post-pubertal subjects presented with a statistically significant increase only in the later-nasal width by 1.3 mm than the untreated controls with no permanent increase in the skeletal maxillary width. CONCLUSION: The literature is very deficient regarding the use of skeletal age as a reference in the treatment of skeletal crossbites using RME. Only weak evidence exists supporting the increased maxillary and lateral-nasal widths after tooth-tissue borne RME in pre-pubertal subjects, with these effects being less in the post-pubertal ones.

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Comparison between rapid and mixed maxillary expansion through an assessment of arch changes on dental casts

Cited by 25 publications

References 28 publications

Expansion of permanent first molars with rapid maxillary expansion appliance anchored on primary second molars

Expansion of permanent first molars with rapid maxillary expansion appliance anchored on primary second molars

Is there a relationship between dental crowding and the size of the maxillary or mandibular apical base?

Transverse Skeletal Effects of Rapid Maxillary Expansion in Pre and Post Pubertal Subjects: A Systematic Review

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