Owens Shannon, Buschang Peter H, Throckmorton Gaylord S, Palmer Leslea, English Jeryl
Texas A&M University System Health Science Center, Dallas 75246, USA.
Am J Orthod Dentofacial Orthop. 2002 Jun;121(6):602-9. doi: 10.1067/mod.2002.122829.
This preliminary study evaluated relationships between masticatory performance and areas of interocclusal distance contact (<50 microm) and near contact (50-350 microm) of the buccal segments during maximum intercuspation. The sample included subjects with normal occlusion (n = 18) and Class I (n = 14), Class II (n = 13), and Class III (n = 6) malocclusions. Chewing performance was evaluated on the basis of the breakdown of CutterSil (Heraeus Kulze, South Bend, Ind); chewing ability was assessed by the number of chews necessary to swallow jerky and almonds. Impressions of the buccal segments, taken with Blu Mousse (Parkell Bio-Materials, Farmingdale, NY) impression material, were scanned and enlarged, and each subject's first molars and premolars were manually traced bilaterally to estimate the platform area. The areas of contact and near contact (ACNC) that measured between 0 and 350 microm thick were estimated optically on the basis of the amount of light transmitted through the impression. The results showed no significant differences in platform area between the right and left sides or between the malocclusion groups. ACNC were negatively related to median particle size and broadness of particle distribution. There were no correlations between ACNC and the number of chews necessary to swallow jerky or almonds. Subjects with normal occlusion had significantly larger ACNC than those with Class I, Class II, and Class III malocclusions, in descending order. Subjects with Class III malocclusions had the smallest areas of near contact (<350 microm). We concluded that ACNC are similar on the right and left sides; that subjects with larger ACNC are better able to break down foods; and that subjects with malocclusions have smaller ACNC than those with normal occlusions.
这项初步研究评估了在最大牙尖交错位时咀嚼性能与颊侧段牙合间距离接触区域（<50微米）和近接触区域（50 - 350微米）之间的关系。样本包括正常咬合者（n = 18）以及安氏I类错牙合（n = 14）、安氏II类错牙合（n = 13）和安氏III类错牙合（n = 6）患者。咀嚼性能通过CutterSil（贺利氏库尔泽，印第安纳州南本德）的破碎情况进行评估；咀嚼能力通过吞咽牛肉干和杏仁所需的咀嚼次数来评定。使用Blu Mousse（帕克尔生物材料公司，纽约州法明代尔）印模材料制取颊侧段印模，进行扫描和放大，然后手动双侧描绘每位受试者的第一磨牙和前磨牙，以估算平台面积。基于透过印模的光量，光学估算厚度在0至350微米之间的接触和近接触区域（ACNC）。结果显示，左右两侧之间或错牙合组之间的平台面积无显著差异。ACNC与中位粒径和颗粒分布宽度呈负相关。ACNC与吞咽牛肉干或杏仁所需的咀嚼次数之间无相关性。正常咬合的受试者ACNC显著大于安氏I类、II类和III类错牙合受试者，顺序依次递减。安氏III类错牙合受试者的近接触区域（<350微米）最小。我们得出结论：ACNC在左右两侧相似；ACNC较大的受试者分解食物的能力更强；错牙合受试者的ACNC比正常咬合受试者小。
