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Rapid maxillary expansion (RME) is a commonly used orthodontic treatment in patients with maxillary constriction to provide skeletal expansion, correct posterior crossbite and resolve naso-respiratory problems by reducing oral respiration.The aim of this randomized controlled trial was to evaluate the effects of tooth-borne, tooth tissue-borne and bone-borne RME appliances on sleep quality with polygraphy. The null hypothesis was that there is no difference for the sleep quality between the appliances.
Introduction. The aim of this 3-arm randomized controlled trial (RCT) was to evaluate the effects of tooth tissue-borne (KBME), tooth-borne (Hyrax), and bone-borne (MIDME) rapid maxillary expansion (RME) appliances on sleep quality with polygraphy.
Methods. This study was designed in parallel with an allocation ratio of 1:1:1. 46 patients with narrow maxilla and OSAS were included in this study and randomly assigned to three groups: tooth tissue-borne, tooth-borne and bone-borne expanders. Participants were congregated from the Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University, Turkey. In all groups, the expansion appliance was activated one-quarter turn twice a day until the desired suture opening was achieved. The primary outcome of this study was the correction of posterior crossbite. Secondary outcomes included polygraphic assessment of sleep parameters. Each subject participated in 1 overnight sleep test with polygraphy before the expansion (T0) and after a 3-month retention phase of treatment (T1). According to the results of polygraphy, 7 parameters; (apnea hypopnea index (AHI), number of apnea and hypopnea, desaturation index, lowest desaturation, average saturation, supin AHI) were examined to evaluate the changes in sleep scores. Kruskal-Wallis analysis and Dunn-Bonferroni test were used for inter-group comparisons and Wilcoxon analysis was used for intra-group evalaution. P<0.05 was accepted statistically significant. Computer-generated randomization was used with group allocation concealed using opaque, sealed envelopes. The outcome assessor was blinded to group assignment. The outcome assessor was blinded; however, it was not feasible to blind either operator or patients.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Tooth tissue-borne (KBME) expander | Experimental | In this tooth tissue-borne appliance, the occlusal surfaces of the molar and premolar teeth and half of the palatinal and buccal surfaces are covered with heat polymerized acrylic. Hyrax expansion screw is in the midline, as far as possible to the palate positioned close and parallel |
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| Tooth-borne (Hyrax) expander | Experimental | In this tooth-borne expansion appliance, orthodontic bands are placed on the right and left 1st premolar and 1st molar teeth of the patients and the bands are soldered to the Hyrax expansion screw. The expansion screw is in the midline, as far as possible to the palate positioned close and parallel |
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| Bone-borne (MIDME) expander | Experimental | This bone-borne expander includes 2 mini-screws with a diameter of 1.6 mm and a length of 10 mm on the right and left sides, coinciding between the roots of the 2nd premolar and 1st molar teeth in addition to the hyrax expansion screw. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Rapid Maxillary Expansion Treatment | Procedure | The patients were treated with KBME, Hyrax and MIDME maxillary expansion appliances, respectively. All expansion appliances containing a Hyrax expansion screw positioned parallel to the second premolars and were used to correct the posterior crossbite. In the MIDME group, two mini-screws with a diameter of 1.6 mm and a length of 10 mm are located on the right and left sides between the roots of the 2nd premolar and 1st molar teeth with 60-70° angle. KBME and Hyrax expansion appliances were cemented with glass ionomer cement and MIDME was cemented with using the light-cured composite. Same protocol was applied to all patients during RME treatment. Expansion screws in all groups were activated by two turns a day. |
| Measure | Description | Time Frame |
|---|---|---|
| Correction of posterior crossbite | The palatal cusps of the maxillary posterior teeth approximated the lingual cusps of the mandibular posterior teeth. | After active expansion (up to 3 weeks). The evaluation of the result has been made by the physician with intraoral clinical examination. |
| Measure | Description | Time Frame |
|---|---|---|
| Polygraphic assessment of sleep parameters | Changes in apnea hypopnea index (AHI) | After 3 months treatment retention period |
| Polygraphic assessment of sleep parameters | Changes in number of apnea and hypopnea |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Gökçenur Gökçe, Phd | Izmir Katip Celebi University | Principal Investigator |
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| ID | Term |
|---|---|
| D012891 | Sleep Apnea Syndromes |
| D020181 | Sleep Apnea, Obstructive |
| ID | Term |
|---|---|
| D001049 | Apnea |
| D012120 | Respiration Disorders |
| D012140 | Respiratory Tract Diseases |
| D020919 | Sleep Disorders, Intrinsic |
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3-arm parallel trial
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| After 3 months treatment retention period |
| Polygraphic assessment of sleep parameters | Changes in number of hypopnea | After 3 months treatment retention period |
| Polygraphic assessment of sleep parameters | Changes in desaturation index | After 3 months treatment retention period |
| Polygraphic assessment of sleep parameters | Changes in lowest desaturation | After 3 months treatment retention period |
| Polygraphic assessment of sleep parameters | Changes in average saturation | After 3 months treatment retention period |
| Polygraphic assessment of sleep parameters | Changes in the value of Supin AHI | After 3 months treatment retention period |
| D020920 |
| Dyssomnias |
| D012893 | Sleep Wake Disorders |
| D009422 | Nervous System Diseases |