The Skeletal and Dental Effects of Rapid Maxillary Expansion

1979 ◽  
Vol 6 (1) ◽  
pp. 25-29 ◽  
Author(s):  
S. Linder-Aronson ◽  
J. Lindgren
Keyword(s):  
Side Effects ◽  
Rapid Maxillary Expansion ◽  
Common Belief ◽  
Maxillary Expansion ◽  
Skeletal Changes ◽  
The Common ◽  
The Mean ◽  
The Stability

The investigation is a continued examination of the dental and skeletal changes accompanying rapid maxillary expansion on 23 patient. It also examines the stability of these changes 5 years post retention The results show that the final increase in width between the upper first molars recorded 5 years post retention Was 45 percent of that initially achieved by rapid maxillary expansion. The mean final increase in the inter canine width was only 23 percent of the expansion achieved initially. The results do not support the common belief that rapid maxillary expansion increases the overjet and reduces the overbite. No unfavourable skeletal and dental side effects of rapid maxillary expansion could be found.

scholarly journals Nonsurgical miniscrew-assisted rapid maxillary expansion results in acceptable stability in young adults

2016 ◽  
Vol 86 (5) ◽  
pp. 713-720 ◽  
Author(s):  
Sung-Hwan Choi ◽  
Kyung-Keun Shi ◽  
Jung-Yul Cha ◽  
Young-Chel Park ◽  
Kee-Joon Lee
Keyword(s):  
Young Adults ◽  
Treatment Modality ◽  
Orthodontic Treatment ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Initial Examination ◽  
The Stability ◽  
Maxillary Deficiency ◽  
Time Point

ABSTRACT Objective:  To evaluate the stability of nonsurgical miniscrew-assisted rapid maxillary expansion (MARME) in young adults with a transverse maxillary deficiency. Materials and Methods:  From a total of 69 adult patients who underwent MARME followed by orthodontic treatment with a straight-wire appliance, 20 patients (mean age, 20.9 ± 2.9 years) with follow-up records (mean, 30.2 ± 13.2 months) after debonding were selected. Posteroanterior cephalometric records and dental casts were obtained at the initial examination (T0), immediately after MARME removal (T1), immediately after debonding (T2), and at posttreatment follow-up (T3). Results:  Suture separation was observed in 86.96% of subjects (60/69). An increase in the maxillary width (J-J; 1.92 mm) accounted for 43.34% of the total expansion with regard to the intermolar width (IMW) increase (4.43 mm; P < .001) at T2. The amounts of J-J and IMW posttreatment changes were −0.07 mm (P > .05) and −0.42 mm (P  =  .01), respectively, during retention. The postexpansion change in middle alveolus width increased with age (P < .05). The postexpansion change of interpremolar width (IPMW) was positively correlated with the amount of IPMW expansion (P < .05) but not with IMW. The changes of the clinical crown heights in the maxillary canines, first premolars, and first molars were not significant at each time point. Conclusions:  Nonsurgical MARME can be a clinically acceptable and stable treatment modality for young adults with a transverse maxillary deficiency.

Rapid Maxillary Expansion in Obstructive Sleep Apnea in Young Patients: Cardio-Respiratory Monitoring

2017 ◽  
Vol 41 (4) ◽  
pp. 312-316 ◽  
Author(s):  
Alfio Buccheri ◽  
Fabio Chinè ◽  
Giovanni Fratto ◽  
Licia Manzon
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Young Patients ◽  
Rapid Maxillary Expansion ◽  
Respiratory Monitoring ◽  
Respiratory Disorder ◽  
Maxillary Expansion ◽  
Mean Values ◽  
Obstructive Sleep ◽  
The Mean

Objective(s): Obstructive sleep apnea syndrome (OSAS) is a respiratory disorder which affects from 1 to 3 % of people during development. OSAS treatment may be pharmacological, surgical or based on application of intraoral devices to increase nasal respiratory spaces. The purpose of this study was to determine the efficacy of the Rapid Maxillary Expander in OSAS young patients by measuring cardio-respiratory monitoring parameters (AHI, the average value of complete and incomplete obstructed respiration per hour of sleep, and SAO2, the percentage of oxygen saturation). Study design: The study was conducted on 11 OSAS young subjects (mean age 6.9±1.04 years), all treated with rapid maxillary expansion (RME). Cardio-respiratory monitoring (8-channel Polymesam) was performed at the beginning (diagnostic, T0) and after 12 months of treatment. Results: The mean values of cardio-respiratory parameters at TO were: AHI=6.09±3.47; SAO2=93.09%±1.60. After 12 months of treatment, the mean values of the same polysomnographic parameters were: AHI=2.36 ± 2.24;SAO2=96.81% ±1.60. These changes were associated with an improvement in clinical symptoms, such as reduction of snoring and sleep apnea. Conclusion(s): This study confirms the therapeutic efficacy of RME in OSAS young patients. This orthopedic-orthodontic treatment may represent a good option in young patients affected by this syndrome.

scholarly journals Skeletal alterations associated with the use of bonded rapid maxillary expansion appliance

2011 ◽  
Vol 22 (4) ◽  
pp. 334-339 ◽  
Author(s):  
Moara de Rossi ◽  
Andiara de Rossi ◽  
Jorge Abrão
Keyword(s):  
Rapid Maxillary Expansion ◽  
Growth Patterns ◽  
Facial Growth ◽  
Maxillary Expansion ◽  
Skeletal Changes ◽  
End Of Treatment ◽  
The Face ◽  
Vertical Changes ◽  
Skeletal Effects ◽  
Cephalometric Study

Bonded maxillary expansion appliances have been suggested to control increases in the vertical dimension of the face after rapid maxillary expansion (RME). However, there is still no consensus in the literature about its real skeletal effects. The purpose of this prospective study was to evaluate, longitudinally, the vertical and sagittal cephalometric alterations after RME performed with bonded maxillary expansion appliance. The sample consisted of 26 children, with a mean age of 8.7 years (range: 6.9-10.9 years), with posterior skeletal crossbite and indication for RME. After maxillary expansion, the bonded appliance was used as a fixed retention for 3.4 months, being replaced by a removable retention subsequently. The cephalometric study was performed onto lateral radiographs, taken before treatment was started, and again 6.3 months after removing the bonded appliance. Intra-group comparison was made using paired t test. The results showed that there were no significant sagittal skeletal changes at the end of treatment. There was a small vertical skeletal increase in five of the eleven evaluated cephalometric measures. The maxilla displaced downward, but it did not modify the facial growth patterns or the direction of the mandible growth. Under the specific conditions of this research, it may be concluded that RME with acrylic bonded maxillary expansion appliance did promote signifciant vertical or sagittal cephalometric alterations. The vertical changes found with the use of the bonded appliance were small and probably transitory, similar to those occurred with the use of banded expansion appliances.

scholarly journals Assessment of Immediate Skeletal Changes after Alternate Rapid Maxillary Expansion and Constriction – A Case Report

2021 ◽  
Vol 10 (34) ◽  
pp. 2954-2959
Author(s):  
Shilpa Venkatesh Pharande
Keyword(s):  
Case Report ◽  
Rapid Maxillary Expansion ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Maxillary Expansion ◽  
Skeletal Class ◽  
Posterior Crossbite ◽  
Skeletal Changes ◽  
Before And After ◽  
Opening And Closing

The Alt-RAMEC protocol was introduced by Liou in the year 2005. It allows for sutural mobilisation by opening and closing the RME screw for 7-9 weeks. Maxillary protraction after the use of Alt-Ramec (alternate rapid maxillary expansion and contraction) protocol is an efficient method for early treatment of skeletal Class III malocclusion. This case report shows the results of using a hyrax bonded maxillary expander with the Alt-RAMEC protocol to treat a maxillary hypoplasia Class III malocclusion. A 12-year-old patient with skeletal class III malocclusion with anterior as well as the unilateral posterior crossbite was treated using this protocol. CBCT scans were taken before and after expansion. These CBCT scans were used for assessing and analysing the skeletal changes that have occurred after using the AltRamec protocol. The objective of this case report is to assess skeletal changes after using the Alt-RAMEC protocol.

scholarly journals Comparison of the effects of rapid maxillary expansion versus Twin Block appliance on mandibular growth in skeletal Class II patients

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Jia-Nan Zhang ◽  
Si Chen ◽  
Cheng-Yi Huang ◽  
Chong Zhong ◽  
Jing Jin ◽  
...  
Keyword(s):  
Class Ii ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Fixed Appliance ◽  
Mandibular Growth ◽  
Twin Block ◽  
Skeletal Class ◽  
Skeletal Changes ◽  
Skeletal Class Ii ◽  
Growth Changes

Abstract Background This is a retrospective study that compares mandibular growth changes in skeletal Class II patients treated by rapid maxillary expansion (RME) and following fixed appliance with those patients treated by Twin-Block (TB) and following fixed appliance. Methods Fourteen patients treated by RME and following fixed appliance were included into the RME group. Fifteen patients treated by Twin-Block and following fixed appliance were included into the TB group. Lateral cephalometric radiographs taken before treatment and immediately after fixed appliance treatment were used to evaluate mandibular growth effects. Results The starting forms of the patients in the two groups were examined to be of good comparability. The mandibular length increased significantly in both groups as measured by Co-Gn, Go-Gn and Ar-Gn, but the TB group didn’t show more mandibular growth than the RME group (P > 0.05). Skeletal changes of the mandible in vertical dimension were different in the two groups. The change in FMA was 0.35° in the RME group, while the change was 2.65° in the TB group (P < 0.001). The change in LAFH was 5.14 mm in the RME group, significantly smaller than the change of 10.19 mm in the TB group (P < 0.001). Conclusion The investigated Phase I treatment with RME followed by Phase II treatment of fixed appliance achieved the same increases in sagittal mandibular growth and facial profile improvements as the Twin-Block therapy. The treatment with RME followed by fixed appliance was better for vertical control, while the treatment with Twin-Block followed by fixed appliance significantly increased the mandibular plane angle.

scholarly journals Skeletal changes of maxillary protraction without rapid maxillary expansion

2010 ◽  
Vol 80 (4) ◽  
pp. 692-698 ◽  
Author(s):  
Dong-Yul Lee ◽  
Eun-Soo Kim ◽  
Yong-Kyu Lim ◽  
Sug-Joon Ahn
Keyword(s):  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Maxillary Protraction ◽  
Skeletal Changes

scholarly journals Clinical effect on the alveolar bone of maxillary molar after rapid maxillary expansion: a systematic review and meta-analysis

2021 ◽  
Author(s):  
Bowen Zhang ◽  
Mengqiao Wang ◽  
Fenglu Zhao ◽  
Zijie Zhang ◽  
Fulan Wei
Keyword(s):  
Systematic Review ◽  
Cortical Thickness ◽  
Alveolar Bone ◽  
Data Extraction ◽  
Meta Analysis ◽  
Rapid Maxillary Expansion ◽  
Cochrane Central Register ◽  
Maxillary Expansion ◽  
Manual Search ◽  
The Stability

Abstract Background This study assessed the effects of rapid maxillary expansion (RME) on alveolar bone cortical thickness and vertical bone level of maxillary first molar. Material and methods PubMed, Web of Science, Cochrane Central Register of Controlled Trials (CENTRAL), Scopus and a manual search in reference lists of the included studies were searched up to November 2020. The data extraction and risk of bias assessment were performed independently by two authors. Review Manager 5 was used for quantitative analysis. Results Eight studies were selected for the systematic review, and six studies were statistically selected in meta-analysis. The thickness of the distal buccal alveolar bone was significantly reduced of both left (MD 0.53;95% CI:0.15–0.90) and right (MD 0.61;95% CI:0.28–0.94) sides of the maxillary first molar after RME. The same was true for the left (MD 0.63;95% CI:0.28–0.98) and right (MD 0.63;95% CI:0.36–0.91) sides of the mesial buccal side. And the vertical distance between the cusp tip and the buccal alveolar crest increased significantly after RME (SMD − 0.92;95% CI: -1.20–0.64). However, the study of palatal cortical thickness of maxillary first molar needs more clinical trials because of its high heterogeneity (left: I2 = 92%; right: I2 = 86%). Conclusions According to current studies, RME can reduce the buccal cortical thickness of maxillary first molars and increase vertical bone loss. More research is needed to determine the stability of the results. However, it is advisable to evaluate the alveolar bone before treatment.

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