Başçiftçi Faruk Ayhan, Uysal Tancan, Sari Zafer, Inan Ozgur
Department of Orthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey.
Am J Orthod Dentofacial Orthop. 2007 Mar;131(3):357-62. doi: 10.1016/j.ajodo.2005.05.052.
The aim of this follow-up study was to evaluate the number of contacts in centric occlusion during a 1-year retention period in patients treated with 2 retention procedures and in a control sample.
Twenty patients received modified wraparound Hawley retainers, and 20 received maxillary Jensen plates with mandibular fixed retainers. These retention patients were compared with a control group of 20 subjects with normal occlusions. Silicone-based impression bites were used to record occlusal contacts. Paired and independent-sample t tests were used to evaluate intragroup and intergroup differences.
Contacts increased in the total arch and the posterior combined (actual/near) during the retention period compared with the control group. In the Hawley retainer group, actual contacts on the second molars (P <.05), near contacts on the premolars (P <.05), and total contacts on the first molars (P <.05) and premolars (P <.01) had statistically significant increases. In the maxillary Jensen plate and mandibular fixed lingual retainer group, the number of actual contacts on the posterior segment increased. Actual contacts on the first molars (P <.01), second molars (P <.01), premolars (P <.05), and canines (P <.05), and total contacts on the first (P <.05) and second (P <.05) molars had statistically significant increases. During the observation period, some slight occlusal changes were seen in the control sample, presumably from growth and development. At the end of the study, during the 1-year follow-up period, no statistically significant occlusal contact differences were observed in the 3 groups.
Retention procedures carried out in this study allowed relative vertical movement of the posterior teeth.
本随访研究的目的是评估采用两种固位方法治疗的患者以及对照样本在1年保持期内正中咬合时的接触点数量。
20例患者佩戴改良环绕式霍利保持器，20例患者佩戴上颌詹森板和下颌固定保持器。将这些保持器治疗的患者与20例咬合正常的对照组受试者进行比较。使用硅基印模咬合记录咬合接触点。采用配对和独立样本t检验评估组内和组间差异。
与对照组相比，保持期内全牙弓和后牙联合区（实际/接近）的接触点增加。在霍利保持器组中，第二磨牙的实际接触点（P<.05）、前磨牙的接近接触点（P<.05）以及第一磨牙（P<.05）和前磨牙（P<.01）的总接触点有统计学意义的增加。在上颌詹森板和下颌固定舌侧保持器组中，后段的实际接触点数量增加。第一磨牙（P<.01）、第二磨牙（P<.01）、前磨牙（P<.05）和尖牙（P<.05）的实际接触点以及第一磨牙（P<.05）和第二磨牙（P<.05）的总接触点有统计学意义的增加。在观察期内，对照组样本出现了一些轻微的咬合变化，可能是由于生长发育所致。在研究结束时，在1年的随访期内，三组之间未观察到有统计学意义的咬合接触差异。
本研究中进行的保持程序允许后牙有相对垂直移动。
