Short-term treatment effects produced by rapid maxillary expansion evaluated with computed tomography: A systematic review with meta-analysis

Abstract

Objective To identify the available evidence on the effects of rapid maxillary expansion (RME) with three-dimensional imaging and provide meta-analytic data from studies assessing the outcomes using computed tomography. Methods Eleven electronic databases were searched, and prospective case series were selected. Two authors screened all titles and abstracts and assessed full texts of the remaining articles. Seventeen case series were included in the quantitative synthesis. Seven outcomes were investigated nasal cavity width, maxillary basal bone width, alveolar buccal crest width, alveolar palatal crest width, inter-molar crown width, inter-molar root apex width, and buccopalatal molar inclination. The outcomes were investigated at two-time points post-expansion (2–6 weeks) and post-retention (4–8 months). Mean differences and 95% confidence intervals were used to summarize and combine the data. Results All the investigated outcomes showed significant differences post-expansion (maxillary basal bone width, +2.46 mm; nasal cavity width, +1.95 mm; alveolar buccal crest width, +3.90 mm; alveolar palatal crest width, +3.09 mm; intermolar crown width, +5.69 mm; inter-molar root apex width, +2.85 mm; and dental tipping, +3.75°) and post-retention (maxillary basal bone width, +2.21 mm; nasal cavity width, +1.55 mm; alveolar buccal crest width, +3.57 mm; alveolar palatal crest width, +3.32 mm; inter-molar crown width, +5.43 mm; inter-molar root apex width, +4.75 mm; and dental tipping, 2.22°) compared to pre-expansion. Conclusions After RME, skeletal expansion of the nasomaxillary complex was greater in most caudal structures. Maxillary basal bone showed 10% post-retention relapse. During retention period, uprighting of maxillary molars occurred.

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

“…Relapse is always inevitable although significantly improved mid-palatal suture width is acquired after expansion and a long maintenance period. A recent systematic review reported that at least 10% post-retention relapse occurred [ 46 ]. The reason is that a malformed balance with the dental arch, tongue and buccal muscles already exists before expansion and the newly formed mid-palatal sutures subjected to compressive force from the buccal-inclined upper posterior tooth, the lingual-inclined lower posterior tooth, the relatively small tongue or the nervous buccal muscles.…”

The effect of concha bullosa and nasal septal deviation on palatal dimensions: a cone beam computed tomography study

“…Palatal interalveolar length (PIL), palatal arch depth (PAD) and maxillopalatal arch angle (MPAA) were measured based on the criteria of Kajan et al [ 9 ]. The radiographic landmarks used for the determination of PIL, PAD and MPAA are described in Fig.…”

“…However, there is a scarcity of radiographic studies evaluating the palatal dimensions of subjects with CB, TH and NSD. The evaluation of the palatal dimensions and nasal structures is important from a clinical aspect, as procedures such as rapid maxillary expansion (RME) have a significant effect on nasal structures [ 9 ]. With this background, we conducted a study to determine the effect of CB and NSD on the dimensions of the hard palate using CBCT.…”

Pain Reduction during Rapid Palatal Expansion Due to LED Photobiomodulation Irradiation: A Randomized Clinical Trial

“…Rapid maxillary expansion (RME) is the treatment of choice for the correction of transversal maxillary deficiency and posterior cross-bite in growing subjects [1]. This treatment is generally performed using a tooth-anchored maxillary expander device [2].…”