Early Orthodontic Treatments of Unilateral Posterior Crossbite: A Systematic Review

Abstract

We aimed to report an update of the systematic review by Petrén et al. (2003). The objective was to evaluate how orthodontic treatments can affect unilateral posterior crossbite (UPXB) in primary and early mixed dentition. Several databases were consulted, and articles published between January 2002 and March 2020 were selected. This review examines the following studies: randomized clinical trials, prospective and retrospective studies with concurrent untreated or normal control groups, and clinical trials comparing at least two treatment strategies. Among the 1581 articles retrieved from the searches, 11 studies were included. Quad-helix (QH) and expansion plate (EP) appliances were compared in three studies. One study compared rapid maxillary expansion (RME) treatment anchored on primary dentition otherwise on permanent molars. One study compared RME and a modified RME with arms extended until deciduous canine and EP. Four studies evaluated the effects of expansion appliances compared with a control group. Compared with the previous review, the quality of the included studies is higher. However, heterogeneity of treatments, different strategies in measurements, lack of a similar follow-up length, and absence of a cost-effectiveness analysis preclude the possibility of providing reliable scientific evidence on the most effective UPXB treatment in primary and early mixed dentition.

Effect of malocclusion on jaw motor function and chewing in children: a systematic review

“…It has also been observed that ↕ [57,61,80] Maximal clench NA ↕ [61,64,81] = [76] ↕ [38,54,56,62] NA NA certain types of malocclusions such as UPXB could have a greater impact on normal jaw function than other types of malocclusions. Posterior crossbite is a common malocclusion affecting approximately 8% to 22% of orthodontic patients in the primary and early mixed dentition, with approximately 50% of cases being unilateral posterior crossbite (i.e., UPXB) [90,91]. Apart from faulty dental occlusion, children with UPXB often suffer from a morphological asymmetry of the mandible [52,92] or bilateral differences in masticatory muscle thickness [93].…”

CBCT Comparison of Dentoskeletal Effects of Haas-Type and Hyrax-Type Expanders Using Deciduous Teeth as Anchorage: A Randomized Clinical Trial

“…In the literature, there are several studies that used 2D radiographs and dental casts to evaluate and measure the structural changes produced by RME [2,3,6,7,[18][19][20]. Some authors studied these effects using 3D technologies when the first permanent molars were used as anchorage [17,21,22], also comparing tooth-borne and tooth tissue-borne appliances [2,9,13,14].…”

Use of Immunofluorescence Technique to Perform a Quantitative Analysis of Masseter Muscle Fibers in Unilateral Posterior Crossbite: A Pilot Study

“…Unilateral posterior crossbite is a malocclusion disease characterized by an inverse relationship between the lower and upper dental cusps [1,[13][14][15][16]. Electrophysiological studies have demonstrated that, when chewing on the affected side, the ipsilateral muscle shows reduced activity and the contralateral muscle activity is normal or increased [2,[17][18][19].…”