Hansen B F, Johansen J R
J Clin Periodontol. 1977 Nov;4(4):263-71. doi: 10.1111/j.1600-051x.1977.tb01898.x.
The periodontal condition was evaluated according to the PI and the Periodontal Treatment Need System (PTNS) in a random sample of 35-year-old citizens of Oslo. The study demonstrated that periodontal disease was a major dental health problem despite the fact that 88.9% of the subjects visited a dentist regularly. No statistically significant differences were found in PI, PTNS and OHI-S values among the different sexes and educational groups. Although the majority of the subjects (77.8%) brushed their teeth more than once a day, the oral hygiene status was not satisfactory (mean OHI-S 1.56). The frequency of toothbrushing did not influence the mean PI scores. Dental hard and soft tissue lesions related to toothbrushing were found in 30.0 and 6.8% of the subjects respectively, and more often among persons brushing more than once a day than among persons brushing less frequently.
在奥斯陆35岁公民的随机样本中，根据菌斑指数（PI）和牙周治疗需求系统（PTNS）评估牙周状况。该研究表明，尽管88.9%的受试者定期看牙医，但牙周疾病仍是一个主要的牙齿健康问题。在不同性别和教育组之间，PI、PTNS和简化口腔卫生指数（OHI-S）值未发现统计学上的显著差异。虽然大多数受试者（77.8%）每天刷牙不止一次，但口腔卫生状况并不理想（平均OHI-S为1.56）。刷牙频率并未影响平均PI得分。分别在30.0%和6.8%的受试者中发现了与刷牙相关的牙齿硬组织和软组织病变，且每天刷牙不止一次的人比刷牙频率较低的人更常出现。
