Longitudinal effects of rapid maxillary expansion on masticatory muscles activity

Palma, Elena Di; Tepedino, Michele; Chimenti, Claudio; Tartaglia, Gianluca Martino; Sforza, Chiarella

doi:10.4317/jced.53544

Cited by 16 publications

(15 citation statements)

References 28 publications

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“…In addition, a proper anchorage is needed, sometimes involving the use of a miniscrew (18,19), which, on the other hand, represents an additional surgical procedure with its own risks and clinical assessment, requiring also the availability of a sufficient space in a convenient location (20-22). If the risk of maxillary canine impaction is recognized at an early age, an attempt can be made to try to change the eruptive path of the canine; this involves the extraction of the deciduous canine (23,24) and rapid maxillary expansion (25,26), possibly with a device anchored onto the deciduous molars to reduce the side effects on permanent teeth (27-30).…”

Section: Discussionmentioning

confidence: 99%

Prevalence of maxillary canine impaction in skeletal Class III malocclusions compared to Class I malocclusions

et al. 2019

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Background: The aim of the present investigation was to evaluate if an orthodontic population of Class III malocclusion patients shows a different prevalence of maxillary canine impaction than Class I subjects. Material and Methods: Fifty-eight subjects were retrospectively selected and assigned to the Class I group (n= 32) or the Class III group (n= 26), depending on the ANB and WITS values. Lateral cephalograms were used to collect angular and linear measurements that described the skeletal and dental maxillary features of the subjects, while orthopantomography was used to assess the impaction or the correct eruption of the maxillary canines. An independent samples T-test or a Mann-Whitney U-test was used to compare the cephalometric values between the two groups, while a chi-squared test was used to evaluate the distribution of maxillary canine impaction between the two groups. Results: No statistically significant difference was found for the cephalometric variables, and the frequency of canine impaction showed no difference between the Class III and Class I subjects. Conclusions: Patients with skeletal Class III malocclusions did not show a different prevalence of canine impaction; therefore, such skeletal features cannot be used as a diagnostic aid for assessment of the risk of maxillary canine impaction.

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Section: Discussionmentioning

confidence: 99%

Prevalence of maxillary canine impaction in skeletal Class III malocclusions compared to Class I malocclusions

et al. 2019

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“…Currently, EMG allows to supervise and investigate some of the main muscles involved in chewing, deglutition and head posture and motion (masseter, temporalis, anterior digastric and sternocleidomastoid), obtaining well reproducible results when standardised protocols are used ( 14 , 18 ). Additionally, sEMG is being used to assess the activity of facial muscles, analyzing the effects of malocclusion and orthodontic treatment on muscular activity ( 4 , 22 ).…”

Section: Resultsmentioning

confidence: 99%

Effects of the functional orthopaedic therapy on masticatory muscles activity

et al. 2017

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BackgroundThe purpose of this study was to examine surface electromyographic (sEMG) activity of masticatory muscles before and after functional orthopaedic therapy with Sander appliance.Material and MethodsTen adolescents (5 girls, 5 boys) with an Angle Class II, division I malocclusion, 9-13 years old, were submitted to sEMG before and after functional orthopaedic therapy. To verify the neuromuscular equilibrium, the standardized EMG activities of right and left masseter and anterior temporal muscles were recorded during maximum voluntary clench, and analysed calculating: POC (index of the symmetric distribution of the muscular activity determined by the occlusion); TC (index of presence of mandibular torque) and Ac (index suggesting the position of occlusal barycentre). The total muscular activity was also calculated. Pre- and post- functional therapy data were compared with Wilcoxon Signed-Rank Test.ResultsBefore treatment, all subjects had a good neuromuscular equilibrium, which was not altered by treatment.ConclusionssEMG evaluations allow to quantify the impact of occlusion on masticatory muscle activity and to control that the functional orthopaedic therapy maintain a good muscular coordination. Key words:Functional appliance, Sander appliance, electromyography, masticatory muscles.

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“…The rationale behind the decision to apply the RME appliance to the primary molars is to transfer the forces produced during the maxillary expansion to deciduous teeth instead of permanent teeth, and to reduce the risk of an iatrogenic scissor bite. Even though some authors have demonstrated that there is generally good functional adaptation to RME treatment ( 19 , 20 ), the forces produced during rapid expansion of the maxillary suture can be extremely high and exceed 100 N ( 21 ); those forces are absorbed by all the circummaxillary sutures ( 22 ) and can produce strains also at the level of the cranial base, leading sometimes to unwanted side effects ( 23 , 24 ). The teeth on which the appliance is bonded also experience these high force levels, which can lead to several complications: exostosis, pulp stones, root resorption, and periodontal damage are the most frequent ( 13 - 15 ).…”

Section: Discussionmentioning

confidence: 99%

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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Longitudinal effects of rapid maxillary expansion on masticatory muscles activity

Cited by 16 publications

References 28 publications

Prevalence of maxillary canine impaction in skeletal Class III malocclusions compared to Class I malocclusions

Prevalence of maxillary canine impaction in skeletal Class III malocclusions compared to Class I malocclusions

Effects of the functional orthopaedic therapy on masticatory muscles activity

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

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