Micheletti Kelly Regina, de Mello Jaqueline Aparecida, de Almeida Barreto Ramos Silvia Regina, Scheibel Paula Cabrini, Scheibel Gilberto Giampá, Ramos Adilson Luiz
Dentistry Department, Universidade Estadual de Maringa, Parana, Brazil.
Int J Pediatr Otorhinolaryngol. 2012 Aug;76(8):1184-7. doi: 10.1016/j.ijporl.2012.05.002. Epub 2012 May 29.
To evaluate the effects of rapid maxillary expansion (RME) on middle ear function before, after, 3 months and one year from expansion procedure.
Eighteen patients with mean age of 8.1 years (±3.7) and posterior cross-bite were followed from pre expansion to one year after RME, regarding their hearing quality and middle ear function. Nine of them presented middle ear dysfunction (MED) and nine presented normal function (NF) before rapid maxillary expansion. Audiometric and tympanometric exams were taken before rapid maxillary expansion, after RME (15 days), 3 months and one year after rapid maxillary expansion.
Among those in the MED group, no patient had acoustic reflex (AR) before rapid maxillary expansion; 67% presented type C tympanometric curve, 22% had type A and 11% had As type tympanometric curve. One year after rapid maxillary expansion, all patients presented AR and showed type A tympanometric curves. In NF group, all patients showed AR and type A tympanometric curves in all records. In both groups no audiograms presented significant variations along study.
Rapid maxillary expansion has no deleterious effect in hearing quality and seems to improve middle ear function in children with posterior cross-bite in a one-year perspective.
评估快速上颌扩弓（RME）在扩弓前、扩弓后、扩弓后3个月及1年对中耳功能的影响。
18例平均年龄8.1岁（±3.7）且患有后牙反合的患者，从扩弓前至RME术后1年，对其听力质量和中耳功能进行随访。其中9例在快速上颌扩弓前存在中耳功能障碍（MED），9例功能正常（NF）。在快速上颌扩弓前、RME术后（15天）、快速上颌扩弓后3个月及1年进行听力测定和鼓室图检查。
在MED组中，快速上颌扩弓前无患者出现声反射（AR）；67%呈现C型鼓室图曲线，22%为A型，11%为As型鼓室图曲线。快速上颌扩弓1年后，所有患者均出现AR并呈现A型鼓室图曲线。在NF组中，所有患者在所有记录中均显示AR和A型鼓室图曲线。在两组中，整个研究过程中听力图均未出现显著变化。
从1年的观察期来看，快速上颌扩弓对听力质量没有有害影响，且似乎能改善患有后牙反合儿童的中耳功能。
