2- Oral hygiene, periodontal conditions and carious lesions in patients treated with dental bridges. A 15-year clinical and radiographic follow-up study (Valderhaug et al. 1993a).
This is a long follow up study, where patients were followed up for up to 15 years, in the first ten years, the patients were called back for professional scaling and polishing regularly every six months. There was no differences in the plaque accumulation around either crowned or normal teeth during the study period. Both crowned and controlled dentition had no variances in the amount of bone loss.
3- Influence of oral hygiene on the mucosal conditions beneath bridge pontics (Tolboe et al. 1987)
In this study patients went through a period of trial of 3 months. In each month they were doing different oral hygiene measure:
A- No oral hygiene near or below the pontic for 4 weeks.
B- Comprehensive hygiene by means of toothbrush and toothpicks for 4 weeks.
C- Comprehensive hygiene by means of toothbrush and dental floss for 4 weeks.
The inflammation in the pontic area and the quantity of plaque accumulation present on the pontic were evaluated using clinical and histologic examinations and quantitative microbiologic tests. This study showed that inflammatory changes
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2010) in this study, sixty-nine fixed partial dentures, one hundred and forty-two abutment teeth none of them received regular maintenance neither in the university nor in any other institutions. The survival rate of these fixed partial dentures were recorded to be 74% in 15 years, they have concluded their study in that periodontal problem is a major consequence of irregular dental maintenance. It might be more valuable if they had similar numbers of fixed partial dentures under regular maintenance to be able to compare the survival results of both of them, although it is possibly very difficult to obtain an ethical approval to do