Stappert Christian F J, Tarnow Dennis P, Tan Jocelyn H-P, Chu Stephen J
Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, New York 10010, USA.
Int J Periodontics Restorative Dent. 2010 Oct;30(5):471-7.
The goal of this study was to quantify the apicoincisal extent of the proximal contact area (PCA) between the eight maxillary anterior teeth. A total of 140 PCA sites and 160 crown lengths were measured in 20 healthy patients. The percentage ratio of PCA to clinical crown length was computed and defined as the proximal contact area proportion (PCAP). Mean PCA dimensions between central incisors (CI/CI), central and lateral incisors (CI/LI), lateral incisors and canines (LI/CA), and canines and first premolars (CA/PM) were 4.2, 2.9, 2.0, and 1.5 mm, respectively. Mesial mean PCAPs were 41%, 32%, 20%, and 18%, respectively. The paired sample t test demonstrated significant differences between all PCAs (P < .0001), except for CA/PM sites (P = .24). Contact areas, not contact points, were observed between neighboring maxillary anterior teeth. Natural PCAPs emerged as well defined in the maxillary anterior dentition bilaterally. Therefore, PCAPs should be taken into consideration for clinical anterior restorations since they determine the papillary and incisal embrasures.
本研究的目的是量化上颌八颗前牙之间邻面接触区（PCA）的切龈向范围。在20名健康患者中，共测量了140个PCA位点和160个冠长。计算PCA与临床冠长的百分比比值，并将其定义为邻面接触区比例（PCAP）。中切牙之间（CI/CI）、中切牙与侧切牙之间（CI/LI）、侧切牙与尖牙之间（LI/CA）以及尖牙与第一前磨牙之间（CA/PM）的平均PCA尺寸分别为4.2、2.9、2.0和1.5mm。近中平均PCAP分别为41%、32%、20%和18%。配对样本t检验显示，除CA/PM位点外（P = 0.24），所有PCA之间均存在显著差异（P < 0.0001）。在上颌相邻前牙之间观察到的是接触区，而非接触点。在上颌前牙列两侧，自然的PCAP表现为界限清晰。因此，临床前牙修复时应考虑PCAP，因为它们决定了龈乳头和切牙间隙。
