Comparison of Dentofacial and Periodontal Effects of Rapid and Semi-rapid Maxillary Expansion

Abstract

Anah tar Ke li me ler Öz AbstractObjective: The purpose of this study was to compare the skeletal, dentoalveolar and periodontal effects that occurred after rapid maxillary expansion (RME) and semirapid maxillary expansion (SRME) with an acrylic splint bonded expansion appliance and also to compare the degree of root resorption in the supporting teeth during expansion. Materials and Methods:The sample of the study included 19 patients having maxillary constriction requiring bilateral upper premolar extraction. The semi-rapid group consisted of 10 patients and the rapid group consisted of 9 patients. Lateral and posteroanterior (PA) cephalometric radiographs were taken at the beginning of the treatment, at the end of expansion and after 3 months of retention period. Eleven patients underwent low-dose computed tomography (CT) at the beginning of treatment and at the end of retention period, after giving informed consent. The evaluation of root resorption was made using a scanning electron microscope from the extracted teeth. Results: Both lateral and PA radiographs showed similar changes between the groups. Posterior nasal cavity width, palatal maxillary width, the distance between palatinal roots and the distance between incisor roots showed significant increase in the CT measurements. Buccal bone thickness decreased and palatal bone thickness increased in all molar and premolar teeth examined. Root resorption was seen in both groups, but no significant differences were observed between the groups. Conclusion: Some differences were seen in short-time effects between SRME and RME but these differences were temporary and disappeared at the end of the retention period. The qualitative evaluation of the roots showed that the location and degree of the root resorption were similar between the groups.Amaç: Bu çalışmanın amacı, akrilik splintli bonded ekspansiyon apareyi ile yapılan yarı hızlı maksiller ekspansiyon (SRME) ve hızlı maksiller ekspansiyon (RME) ile meydana gelen iskeletsel, dentoalveolar ve periodontal etkileri; ayrıca tedavi sırasında destek dişlerde meydana gelen kök rezorpsiyonunun şiddetini karşılaştırmaktır.

Effect of three different maxillary expansion appliances on root resorption

“…Yildirim and Akin observed the teeth on tissue-borne RME side and more resorption on the buccal surface than on the lingual surface (16). In another study, Gönüldaş evaluated SRME and RME procedures with bonded acrylic splint appliances and researched the buccal root surface changes of supporting teeth with SEM (22). Her study found no statistically significant difference in the amount of resorption between the two groups.…”

“…Previous research has compared skeletal and dentoalveolar changes arising from SME and RME conducted with a tooth support and/or tooth tissue appliances (21,22). However, no research has investigated differences in root resorption in three dimensions among RME, SRME, and SME protocols, which are the most commonly used protocols for upper maxillary expansion.…”

Does the rhythm and appliance type of rapid maxillary expansion have an effect on root resorption?

“…Previous orthodontic studies comparing RME and SRME investigated dentoskeletal effects, long-term stability, periodontal effects, nasal airway, and conductive hearing loss. 1,6,[17][18][19] However, no previous study has compared the root resorption occurring after RME and SRME with different appliance designs using micro-CT.…”

“…This finding was supported by previous studies in which more root resorption was detected on the buccal surface after RME. 8,10,11,17 Yildirim and Akin 11 compared the bone-borne and tooth-borne RME appliance effects on root resorption using micro-CT. Their study was a well-designed investigation, and the results of the tooth-borne appliance group were very similar to the current study. However, the methodologies were very different between the studies.…”