Ogawa T, Ogimoto T, Sumiyoshi K, Koyano K
Jane and Jerry Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry, UCLA School of Dentistry, Los Angeles, CA 90095, USA.
J Oral Rehabil. 2003 Nov;30(11):1062-9. doi: 10.1046/j.1365-2842.2003.01183.x.
Once subjected to denture wearing, oral mucosa has to withstand mechanical loads of various levels and durations. However, how this load affects oral mucosal sensitivity is unknown. This study investigated the pressure-pain threshold (PPT) of oral mucosa with or without pre-loading. An electric pressure algometer was developed specifically for measuring the PPT of oral mucosa. Measurements of 10 dentulous maxillae showed that the baseline PPT (BPPT) of the palatal site was 4.9- and 3.7-fold greater than that of the labial or buccal sites, respectively. The PPT of the labial site decreased significantly compared with its BPPT after 2 s-100% BPPT and 5 s-100% BPPT pre-loading. The PPT of the palatal site increased after 5 s-50% BPPT and 5 s-80% BPPT and 0.2 s-100% BPPT and 2 s-100% BPPT pre-loading. The PPT of the buccal site did not change after all levels and durations of pre-loadings tested. These results indicated the disproportionate modulation of oral mucosal PPT following various loads, suggesting that oral mucosa possesses region-specific psychophysical tolerance to mechanical stimuli.
一旦佩戴假牙，口腔黏膜就必须承受不同程度和持续时间的机械负荷。然而，这种负荷如何影响口腔黏膜敏感性尚不清楚。本研究调查了有无预加载情况下口腔黏膜的压力疼痛阈值（PPT）。专门开发了一种电子压力痛觉计来测量口腔黏膜的PPT。对10例有牙上颌骨的测量结果显示，腭部部位的基线PPT（BPPT）分别比唇部或颊部部位高4.9倍和3.7倍。在进行2秒-100%BPPT和5秒-100%BPPT预加载后，唇部部位的PPT与其BPPT相比显著降低。在进行5秒-50%BPPT、5秒-80%BPPT、0.2秒-100%BPPT和2秒-100%BPPT预加载后，腭部部位的PPT升高。在测试的所有预加载水平和持续时间后，颊部部位的PPT均未改变。这些结果表明，不同负荷后口腔黏膜PPT的调节不均衡，提示口腔黏膜对机械刺激具有区域特异性的心理物理耐受性。
