Reliability of CBCT and other radiographic methods in preoperative evaluation of lower third molars.

Objectives: The aim of this study was to compare the reliability of cone-beam computerized tomography (CBCT) with that of other radiographic methods in preoperative radiographic determination of the number of roots of lower third molars and their relationship to the inferior alveolar canal (IAC).

Study Design: Forty-two teeth were clinically studied and imaged using CBCT and other imaging methods-panoramic radiography, multiprojection narrow-beam radiography (MNBR), and cross-sectional tomography. Statistical analysis (kappa values) was used to compare the diagnoses of 2 trained oral radiologists and the radiologic diagnoses with the findings at operation.

Dental and oral radiographic findings in first-year university students in 1982 and 2002 in Helsinki, Finland.

Objective: This study is part of a larger research program, at the Finnish Student Health Service in Helsinki, in which changes in the dental and oral health of first-year university students (born in Helsinki) in the years 1982 and 2002 were compared.

Material And Methods: Panoramic radiographs were taken of 176 students in 1982, mean age 19.8 years (SD+/-0.

Oral piercings among first-year university students.

Objective: The aim of the study was to examine oral piercings among first-year university students.

Study Design: First-year university students in 2002 were invited to a dental examination (n = 234; 49 men and 185 women). Students with piercings formed the study group and the rest served as controls.

Clinical outcome of third molars in adults followed during 18 years.

Purpose: The aim of the present study was to follow the clinical changes in third molar status during an 18-year period in patients aged 20 to 38 years.

Patients And Methods: The series consisted of 118 subjects (37 men and 81 women). In the beginning of the study, the mean age was 20.

Prevalence of short-root anomaly in healthy young adults.

Short-root anomaly (SRA), occurring mostly in maxillary incisors, is defined as developmentally very short, blunt dental roots. The condition has a genetic background and is related to hypodontia. Earlier population studies have been based on schoolchildren with developing dentitions and have indicated prevalence figures between 1% and 10%.

Radiographic follow-up of impacted third molars from age 20 to 32 years.

Nineteen patients (13 male, six female) with 34 impacted third molars, 21 in the mandible and 13 in the maxilla were radiographically followed from age 20 to 32. All were examined clinically and panoramic radiographs were taken at baseline and at the end of the study. Radiographic analysis included resorption of teeth, enlargement of the follicle, development of the root, change in inclination of the third molar, state of impaction, relative depth of the third molar in bone and relation to the ramus of the mandible and to the second molar tooth.

Long-term evaluation of estimates of need for third molar removal.

Purpose: The aim of this study was to evaluate the estimates on need for third molar removals made at age 20 after 12 years.

Patients And Methods: The series consisted of 81 university students followed from age 20 to 32 years. At baseline and at study end, these students were clinically examined, and panoramic radiographs were taken.

Change in clinical status of third molars in adults during 12 years of observation.

Purpose: The aim of the study was to follow the clinical changes in third molar status during a 12-year period in patients aged 20 to 32 years.

Patients And Methods: The study was based on a follow-up of 81 university students (32 men, 49 women). They were clinically examined and panoramic radiographs were taken at baseline (mean age, 20.

Traumatic injuries among university students in Finland.

A questionnaire dealing with the incidence of traumatic injuries was sent to 1,000 randomly selected 3rd-year university students in Finland; 617 students responded adequately. Of those, 177 (28.7%) reported a combined total of 281 accidents and 323 separate injuries requiring medical or dental treatment during the preceding 3 years.

Third molars as an acute problem in Finnish university students.

The study was carried out to determine the risk of acute disease of third molars in young adult patients. The subjects in this case-control study were 100 consecutive university students who complained of third molar problems when making an appointment. The third molars were mostly mandibular, partly erupted, and distoangularly oriented.

Effect of erupting third molars on dental caries and gingival health in Finnish students.

The purpose of this study was to assess how the eruptive status of third molars relates to gingival and dental health and, in particular, to the status of the adjacent second molar. One hundred and twenty-three young adults were followed up over a 6-year period, from age 20 to age 26. The status of the second and third molars, and DMF, DMFS, DS, MS, and FS indices, periodontal condition, and salivary acidogenic bacterial counts were assessed.

Use of dental services by students of Helsinki University during six years.

This follow-up study was carried out to survey the utilization of dental services among university students, together with treatment modalities received during their six years of university studies. Initially 20-year-old students were followed during six years, starting from their first year at the University of Helsinki. Results of the questionnaire showed that during the previous 12 months 59% of the students had had a dental appointment, mostly on their own initiative.

Clinical follow-up study of third molar eruption from ages 20 to 26 years.

The development of 412 upper and lower third molars was clinically followed up for 6 years in 120 students, starting at the age of 20 years. Clinical and radiographic examinations carried out at baseline and 6 years later showed that during the follow-up period almost half the third molars originally recorded as partially erupted had erupted. When the lower third molars were initially invisible, only 9% of them had erupted by age 26 years whereas 29% remained invisible.

Assessing the eruption of lower third molars on the basis of radiographic features.

To determine radiographic features by which one could estimate whether lower third molars are likely to erupt after the age of 20 years, university students with a total of 84 unerupted or partially erupted lower third molars were followed up. Five radiographic features of each third molar were measured from the panoramic tomogram taken at age 20 years, and the status of third molars was examined for a second time at age 26 years. The results showed that the lower third molars that did erupt after the age of 20 years were initially: 1) root formation complete; 2) impacted in soft tissue; 3) vertical; 4) placed at the same occlusal level as the neighbouring second molar; 5) showed sufficient space between the ramus and the second molar.

Systematic dental health care among Finnish university students.

Regular dental examinations and treatment are the cornerstones of good oral health. Regular dental care is provided for Finnish students through free dental examinations in their first, third and fifth years. This paper describes the dental care services by the Finnish Student Health Service to students and reports on the outcome of this systematic dental care, with special reference to needs for treatment of caries, wisdom teeth and attachment tissues.

Periodontal status in university students.

The periodontal status of 217 5th-year students (aged 25-26 years and born in Helsinki) at the University of Helsinki was assessed. The students had been eligible for community-based dental care free of charge until the age of 18 years, after which they could obtain low-cost dental care from the Helsinki Student Health Service. Their periodontal status was determined according the community periodontal index of treatment needs; gingival retraction was recorded when 1 mm or more of the cementum was exposed.

Erupting third molars and salivary lactobacilli and Streptococcus mutans counts.

The salivary lactobacilli and Streptococcus mutans counts in 217 university students of 25.4-yr-old were studied with regard to the state of eruption of their third molar teeth. Statistically significantly higher counts of both bacterial species were found in students who had one or more third molars partly erupted, compared with those whose third molars were lacking or fully erupted.

Differentiating positively and negatively health oriented Finnish university students by discriminant analyses.

Dental health practices among Finnish university students were studied in 1980. In order to obtain more information about the factors associated with different health status this problem was studied using linear discriminant analyses. 360 students were separately classified into fifths according to increasing individual VPI, GBI and DMFS index scores.

Use of dental floss by Finnish students.

In order to elucidate dental care behavior related to interdental cleaning, a group of first-year students were invited to a free dental examination. 186 of the students invited (76%) were examined clinically and roentgenologically. The mean DMFS-index of the students was 22.

Clinical assessment of amalgam fillings.

The purpose of this study was to determine the quality of amalgam fillings among 20-yr-old Helsinki University students. The quality of the fillings was evaluated for the teeth 16 and 46. The marginal adaptation, anatomical form and surface texture of the fillings were evaluated and the filled surfaces were classified as being good, or requiring refinishing or replacement.