A panoramatomographic study of the teeth and jaws of Finnish university students

Abstract

A random sample of panoramic radiographs was taken of 1027 (386 male and 641 female) university students. All the students were born between 1965 and 1971. The following were examined: caries, apical radiolucencies, endodontically treated teeth, marginal and vertical bone loss, third molars, supernumerary, missing, and persisting teeth, bone structure, condyles, maxillary sinuses and soft tissue calcifications. In the inter- (of two examiners) and intra-examiner variation Kappa indices varied between 0.15 and 1.00, and agreement percentages from 52, to 100. Kappa index was poor (0.15) in evaluation of the bone structure. The mean DMFT index for the students was 8.4. A sound dentition was found in 6.6%, and 48.4% of the students were free of caries. The mean number of carious lesions was 1.1. There were 50 retained roots (49 from primary teeth). 76.6% of the students had one or more unerupted wisdom teeth and 22.7% had radiologic changes typical of pericoronitis in the region of the mandibular third molars. 16.2% of the students had at least one missing wisdom tooth. Bone structure was normal in 92.4% of the students, idiopathic osteosclerosis being the most common divergence (3.5%). Arthrotic changes in the condyles were found in 9% of the students. In eight cases there was erosion of the condyles, which was diagnosed as arthritis. Styloid ligament calcifications were found in 21.5% of the students. In the maxillary sinuses, male students exhibited changes 1.7 times more often than female students (26.3% in males and 15.1% in females).

Incidence of Mandibular and Maxillary Impacted Canines Transmigration:a Retrospective Study

“…The etiology of transmigration is unknown; however, abnormal displacement of the tooth bud or deviation during development is the most commonly accepted explanation. 23 Although unerupted maxillary canine is seen almost 20 times more frequent than mandibular canines, it is interesting that TCs are more common in the mandible 3 .…”

“…Secondly, maxillary incisors radices are longer than mandibular incisor roots and the short distance between the base of the nose and apices of the incisors , which makes the transmigration more difficult 3,18 . Finally, it has been suggested that the most important factor in maxillary canine transmigration is their positions and angulations 13 .…”

“…If a tooth is unerupted more than twelve months after the normal age for eruption has been reached; it is called as "impacted" 5 . The incidence of impacted teeth has been reported between 6.9% and 76.6% [1][2][3][4][5][6] . The most frequently impacted teeth are third molars, upper canines, upper central incisors and upper premolars, respectively [7][8][9] .…”

“…Tooth impaction is an endemic dental problem [1][2][3][4] . If a tooth is unerupted more than twelve months after the normal age for eruption has been reached; it is called as "impacted" 5 .…”

Di̇ş Heki̇mli̇ği̇nde Koni̇k Işinli Bi̇lgi̇sayarli Tomografi̇ Kullanimi

“…Literatürde %6,9'dan %76,6'ya kadar gömülü kalma sıklıkları belirtilmiştir. [24][25][26][27][28][29] Genellikle sırasıyla; üçüncü molarlar, maksiller kaninler, maksiller santral dişler ve premolar dişler gömülü olarak en fazla rapor edilen dişlerdir. [30][31][32][33] Özellikle üçüncü molar dişlerin gö-mülü kalmasına bağlı olarak oluşan çeşitli rahatsız-lıkların, diş sinir ilişkisinin, diş pozisyonun, bukkal ve linguale komşuluklarının cerraha yol göstermesi açı-sından KIBT imajlarının değerlendirilmesi gerekir.…”