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Prevalence of retained roots in the Finnish adult population
Abstract
The prevalence of retained roots among Finnish adults was evaluated by examining a representative sample of 8000 Finnish adults aged 30 or older. The participation percentage was 89.6. Retained root was recorded when more than half the height of the tooth surfaces had been destroyed by caries. The reproducibility coefficient (kappa) for clinical recordings of retained roots was 0.79 for intraexaminer cases and 0.65 for interexaminer cases. Fifteen percent of the subjects had one or more retained roots. Prevalence was twice as great among males as among females. The mean number of retained roots was 0.4 per subject. Of all teeth in the mouth, 4.4% had only the roots left. On the population level, some 343000 adult Finns were estimated to have at least one retained root.
... Such roots occur when the crown has disappeared either during extraction or due to caries and the roots radiographs are rarely obtained in population studies. In a nationwide population-based study from Finland in the 1980s, the prevalence of clinically visible retained dental roots was 15%, regardless of tooth type [2]. In that study of 7168 participants, the prevalence of retained roots was twice as great in men as in women. ...
... Our study partly confirmed some earlier findings on the prevalence of retained dental roots of all teeth. The occurrence of 13% observed here for retained roots is lower than those of an earlier Finnish (15%), British (17%), and US (20%) studies [2,11,3]. The slightly lower occurrence of retained roots in our study may indicate that the level of oral and dental health has increased since the time of the oldest studies. ...
... Earlier studies have not compared sexes for the presence of retained roots located entirely in bone. In a population study of clinically visible roots alone, a higher occurrence of retained roots in men was reported [2]. However, the sex-difference was not apparent when using linear regression analysis [15]. ...
The aim of this study was to assess the occurrence and nature of retained dental roots and their associations with demographics in the Finnish adult population. From the cross‐sectional nationwide Health 2000 Survey of the Finnish population aged 30 years and older, 6005 participants with clinical oral examination and panoramic radiographs were included. Occurrence and characteristics of all retained dental roots were examined. Statistical analyses included χ2, Kruskal–Wallis and Mann–Whitney U tests, and SAS‐SUDAAN calculations. The mean age of the 6005 participants (46% men and 54% women) was 53 (SD 14.6) years. At least one retained dental root was observed in 13% (n = 754) of the participants. The 1350 retained roots included 461 (34%) roots retained entirely in bone and 889 (66%) partly in bone. The most common location of a retained dental root was the third molar region. Occurrence of retained roots partly in bone was associated with male sex and lower education. Occurrence of retained third molar roots entirely in bone was associated with female sex, younger age, higher education, and living in a city. Among all retained dental roots, the preponderance of third molars emphasized the demanding nature of extracting the third molar in women.
... There are some advantages and disadvantages to panoramic radiography. [1,14] The superimposition of structures is the one of the disadvantages related to the study. Superimposition in the permanent premolar region, which is the localization of the primary molar roots, increases the difficulties in the diagnosis of the structures. ...
... Therefore, it is important to know the magnitude of the problem within any given population. [14] Since 75% of the patients were aged 30 years or younger, showing early loss of premolar teeth after the age of 30, we excluded patients with missing premolar teeth. Of the 20 retained primary roots, 17 were found to be impacted without any symptoms in the present study. ...
Background:
The roots of primary molars were found in the permanent dentition without symptoms on the clinical or radiographic examination. However, their incidence could not be achieved on the current literature.
Objective:
The aim of this study is to evaluate the radiographic features of the embedded primary molar roots in adult dentulous patients in Turkey.
Materials and methods:
The data, from 5000 adult patients, including panoramic radiographs and demographic information, were evaluated retrospectively. The prevalence and location of the primary molar roots in the jaws were determined, as well as the prevalence and location of the primary molar roots in the adjacent permanent root levels.
Results:
Among 5000 Turkish population dentulous patients, 20 retained primary molar roots (0.38%) were found in 19 ones.
Conclusions:
The prevalence of the primary molar roots in the present study was found to be lower than that of the previous study. This finding may result from the larger amount of patient data that was evaluated in this study, which used panoramic radiographs.
An epidemiological survey of the oral health needs of 1144 elderly patients was conducted in hospitals and nursing homes in Western Australia. Patients were categorised as being either totally dependent (requiring intensive nursing care) or partially dependent (requiring nursing supervision). Of all patients the mean age was 80.2 yr, 70% were women, 74% were edentulous, and 70% needed some form of prosthetic care. Of all dentate patients 56% needed dental scaling (and 17% needed complex periodontal treatment), 47% needed some restorative treatment (with a mean need per patient of 1.1 coronal restorations and 0.4 radicular restoration), and 29% needed one or more dental extractions (with a mean need of 1.4 extractions per patient). Partially dependent patients had statistically significant higher needs for prosthetic work than did totally dependent patients, while the converse applied to extraction needs, but in all other aspects the needs of the two categories of patient did not differ significantly.
In the present study the association between the occurrence of retained roots and several oral status factors was studied using a representative sample of 8,000 Finnish adults 30 yrs of age and over. The overall prevalence rate of dentate subjects with roots was 21%, a rate consistently higher among men. In the age category 65+ yrs, the prevalence rate was 35%. Among subjects with at least one root the average number of roots was 2.7. Those having removable denture(s) and a number of filled teeth showed a decreased probability of having root(s). Among those having root(s) the greater number of roots was associated with increasing age and with increasing number of remaining and decayed teeth.
During the Second World War the incidence of dental caries diminished due to reduced sugar consumption. It is possible that this reduction was more permanent in those age cohorts whose teeth erupted during the war because the teeth had an opportunity to mature before the caries attack. The aim of our study was to establish whether this reduction could still be demonstrated 40 yr after the war. The material consisted of consecutive age cohorts born in 1922-48 from the large Mini-Finland Oral Health Survey representing Finnish adults aged 30 yr or over in 1979. The results showed a systematic difference in the number of caries free premolars and second molars between the age cohort born in 1931-33 and the younger and older age groups in favor of the group 1931-33, indicating that the first years after eruption may have had a long-term effect on the health of the teeth.
2 statistics, kappa and weighted kappa, are available for measuring agreement between 2 raters on a nominal scale. Formulas for the standard errors of these 2 statistics are in error in the direction of overestimation, so that their use results in conservative significance tests and confidence intervals. Valid formulas for the approximate large-sample variances are given, and their calculation is illustrated using a numerical example. (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.
Condition of the dentition and jawbones of a Finnish working age population
- Konow L von