Gallagher S, O'Connell B C, O'Connell A C
Division of Public and Child Dental Health, Dublin Dental University Hospital, Dublin, Ireland.
J Oral Rehabil. 2014 Oct;41(10):730-6. doi: 10.1111/joor.12196. Epub 2014 Jun 10.
Many stainless steel crowns (SSCs) disrupt the occlusion in children, but stabilisation appears to occur within a short period post-placement. The extent and mechanism of these short-term occlusal changes in children are unknown. This study sought to determine whether placement of a SSC changes the maximum intercuspation position (MIP) in children, whether the MIP returns to normal within 4 weeks and whether local anaesthesia had an effect on the child's ability to achieve MIP. The T-Scan(®) III was used for the measurement of occlusal contacts. Reliability and reproducibility of the system was determined using a calibration exercise where MIP recordings were taken of eleven children not undergoing any dental treatment. For the main study, the percentage of total occlusal force on each tooth was recorded in 20 children preoperatively, after local anaesthesia, after SSC placement and 4 weeks postoperatively. There was no significant difference in MIP (P = 0·435) preoperatively and post-administration of local anaesthesia. There was a significant difference between the preoperative force on a tooth and the reading after crown placement (P = 0·0013, Wilcoxon test). By 4 weeks, there was no significant difference overall between post-SSC placement and the preoperative value for the tooth (P = 0·3). Administration of local anaesthesia did not affect the ability of a child to attain MIP. Maximum intercuspation position was disturbed by the placement of a SSC in seven of 20 cases. When MIP was disturbed, in most cases, it returned to preoperative status within 4 weeks of crown placement.
许多不锈钢全冠（SSC）会破坏儿童的咬合，但在放置后短期内似乎会趋于稳定。儿童这些短期咬合变化的程度和机制尚不清楚。本研究旨在确定SSC的放置是否会改变儿童的最大牙尖交错位（MIP），MIP在4周内是否恢复正常，以及局部麻醉是否会影响儿童达到MIP的能力。使用T-Scan(®) III测量咬合接触。通过对11名未接受任何牙科治疗的儿童进行MIP记录的校准练习，确定了该系统的可靠性和可重复性。在主要研究中，记录了20名儿童术前、局部麻醉后、SSC放置后及术后4周时每颗牙齿上的总咬合力百分比。术前和局部麻醉给药后MIP无显著差异（P = 0·435）。牙齿术前的咬合力与冠修复后的读数之间存在显著差异（P = 0·0013，Wilcoxon检验）。到4周时，SSC放置后与牙齿术前值总体上无显著差异（P = 0·3）。局部麻醉的使用并不影响儿童达到MIP的能力。在20例病例中有7例，SSC的放置干扰了最大牙尖交错位。当MIP受到干扰时，在大多数情况下，它在冠修复后4周内恢复到术前状态。
