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

Tepedino, Michele; Iancu-Potrubacz, Maciej; Ciavarella, Domenico; Masedu, Francesco; Marchione, Laura; Chimenti, Claudio

doi:10.4317/jced.54585

Cited by 12 publications

(10 citation statements)

References 33 publications

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“…Although Masucci et al 22 reported about 30-40% relapse after palatal expansion in the pure deciduous dentition, other research groups described excellent overall long-term stability of very early crossbite correction. [22][23][24][25][26] The authors of the present paper have only very rarely (less than 2%) experienced transverse relapse in their patients, who had to be either retreated by a second RPE or by insertion of a transpalatal bar.…”

Section: Posterior Crossbitementioning

confidence: 57%

Very early orthodontic treatment: when, why and how?

Schneider-Moser

Moser

2022

Dental Press J. Orthod.

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Introduction: Several orthodontic problems should already be treated at an early age to prevent the necessity of future complex and expensive procedures. Scientific evidence suggests that posterior crossbites, mild to moderate Class III, as well as certain Class II malocclusions, open bites and arch length discrepancies can benefit from simple, but efficient interceptive therapy. Objective: To summarize the existing evidence-based literature on early orthodontic treatment, and to illustrate its application and effectiveness by showcasing multiple clinical examples. Conclusion: Early short-term interceptive orthodontic treatment with simple appliances, in the deciduous or early mixed dentition phase, can efficiently correct certain malocclusions and help to either reduce the complexity or even avoid the necessity of complex and expensive procedures during puberty. For certain patients with significant arch length discrepancy the concept of serial extractions should be part of the orthodontic armamentarium.

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Section: Posterior Crossbitementioning

confidence: 57%

Very early orthodontic treatment: when, why and how?

Schneider-Moser

Moser

2022

Dental Press J. Orthod.

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“…For many years, scholars have tried to find an effective and convenient way to prevent the relapse of mid-palatal suture expansion [ 28 , 29 ]. There is no doubt that mechanical retention is the most effective way to achieve this goal.…”

Section: Discussionmentioning

confidence: 99%

Parathyroid hormone promotes maxillary expansion and reduces relapse in the repeated activation maxillary expansion rat model by regulating Wnt/β-catenin pathway

Feng

et al. 2022

Prog Orthod.

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Background Constricted maxillary bone is a common skeletal deformity, which may lead to crowding and posterior crossbite. Mid-palatal suture expansion is often used to increase the maxillary width, but its skeletal effects are limited and tend to relapse, even with prolonged retention. We hypothesized that parathyroid hormone (PTH) may reduce the relapse of maxillary expansion. Methods We established a novel rat maxillary expansion model using palatal tubes with an insertable “W”-shaped spring which can be repeatedly activated. A total of 32 male healthy Wistar rats were randomly divided into six groups: the control group, the PTH group, the expansion group, the expansion + PTH group, the expansion + relapse group and the expansion + PTH + relapse group. All animals in the first 4 groups were killed after 10 days and the 2 relapse groups were killed after 15 days. The maxillary arch widths and histological staining were used to assess the expansion and relapse effects. The immunohistochemical staining, micro-CT, RT-qPCR and Western blot were used to evaluate the bone remodeling during expansion. Results The suture width was increased by the expansion device, and the repeated activation maxillary expansion rat model showed better expansion effects than the conventional model. PTH significantly promoted the expansion width and reduced the relapse ratio. Meanwhile, in the expansion + PTH group, histological and immunohistochemical staining showed that osteoblasts, osteoclasts, new cartilage and osteoid were significantly increased, micro-CT showed increased bone mass, and PCR and Western blot results confirmed up-regulation of RANKL, β-catenin, type II collagen and OCN. Conclusion The novel repeated activation maxillary expansion rat model has better effects than the conventional model. PTH enhances the maxillary expansion and reduces its relapse by regulating Wnt/β-catenin and RANKL pathways. PTH administration may serve as an adjunctive therapy in addition to mechanical expansion for treatment of maxillary constriction.

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“…The mean age of the present sample at T0 was less than 9 years, and the T1 records were taken a mean of 18 months later; therefore, the likelihood that those patients were in a phase of adenoidal tissue growth peak and that the increase in nasopharyngeal area observed was due to treatment is high. Of course, the only way to prove this statement would be to include a control group of untreated patients; however, it is unethical to postpone a treatment of maxillary expansion in 9-year-old patients by one-and-a-half years with the certainty that the outcome would be worsened because the successful opening of the midpalatal suture is age-dependent ( 38 ), and treatment should be carried out ideally with the appliance bonded on deciduous teeth ( 39 ).…”

Section: Discussionmentioning

confidence: 99%

Long-term effect on adenoid dimensions and craniocervical angulation after maxillary expansion with fixed or functional appliances

Tepedino¹,

Montaruli²,

Scapato³

et al. 2021

J Clin Exp Dent

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Background Maxillary expansion is a common orthodontic procedure that could have a positive effect also on airway patency. The aim of the present study was to evaluate the long-term effects of rapid maxillary expansion (RME) on nasopharyngeal area and cranio-cervical angulation in growing patients, compared to controls treated with a function-generating bite appliance (FGB). Material and Methods Sixty patients aged 6-14 consecutively treated with RME or FGB were selected retrospectively and divided into two groups. Lateral cephalograms taken before and after treatment were retrieved, and the nasopharyngeal area, delimited superiorly by a sella-posterior nasal spine (PNS) line and inferiorly by a basion-PNS line, and the cranio-cervical angulation were measured. Results The mean observation time was 17.6 ± 8 months. No differences were present between the two groups regarding age and gender. The nasopharyngeal area increased significantly in both groups after treatment, but with no statistically significant difference between them. The cranio-cervical angulation showed no differences within or between groups. Conclusions Maxillary deficiency treatment with either RME or FGB was followed by a comparable increase in nasopharyngeal area. Key words: Rapid maxillary expansion, Airway, Nasopharyngeal area, Adenoid.

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

Cited by 12 publications

References 33 publications

Very early orthodontic treatment: when, why and how?

Very early orthodontic treatment: when, why and how?

Parathyroid hormone promotes maxillary expansion and reduces relapse in the repeated activation maxillary expansion rat model by regulating Wnt/β-catenin pathway

Long-term effect on adenoid dimensions and craniocervical angulation after maxillary expansion with fixed or functional appliances

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