Pattern of third molar impaction in a Singapore Chinese population: a retrospective radiographic survey

Abstract

One thousand orthopantomograms (OPGs) of patients 20-40 years old were examined. Where impacted third molars were present, the angle and depth of impaction were recorded. Results were analysed using the Pearson chi2 test. 68.6% of OPGs showed at least one impacted third molar. The frequency was three-fold higher in the mandible (1024/1079=90%) than in the maxilla (306/1077=28%), with a significantly higher frequency (P<0.05) in females (56%) than males (44%). The mesioangular impaction was the most common, and 80% of all impacted third molars were partially buried in bone. Of the 429 bilateral occurrence of impacted third molars, 423 were in the mandible. It was concluded that the frequency of impacted third molars in the Singapore Chinese population studied was generally two to three times that reported in races of the Caucasian stock. There was also double the frequency of impacted third molars when compared to a previous study in a Chinese population published in 1932 with females being more frequently affected than males.

Profile of Odontectomy Cases in an Indonesian Teaching Hospital

“…17 But another study showed that the most common position was B (80%). 18 This study supports a study that stated position B was the most common. 19 In the present study, position A was the most common position (62.2%).…”

Difficulty index in extraction of impacted mandibular third molars and their post-operative complications

“…A study among the Jordanian population 13 found that vertical type of angulation was the most common (61.4%) and mesioangular type was only 18.1%. However, studies among Chinese (80%) and Korean populations (46.5%) showed that mesioangular type of impaction was the most frequently seen 11 . In this present study too, the mesioangular type was the commonly extracted tooth (43.7%).…”

“…The occurrence of Vol. The angulation of the third molar to the long axis of the second molar was measured using the method suggested by Quek et al (2003) 11 . Class III third molar is totally embedded in the bone because of lack of space Inclusion Criteria: All the patients included in this study were 18 years and older, as growth is essentially completed by this age along with complete root formation, either being straight, curved or fused.…”

The Prevalence of Impacted Premolars in the Anatolian Population

“…Impacted premolars were recorded based on Winter's classification systems. The angulations of impaction were measured using the Quek et al (10) method to classify as mesioangular, vertical, distoangular, horizontal and bucco-lingual ( Figure 1). The percentage and number of impacted premolars according to tooth angulations were determined .…”

“…Although they are mostly asymptomatic, they are sometimes discovered when a patient presents with pericoronitis or pathologies such as a cystic lesion in an adjacent tooth. Thus, the discovery of an impaction usually occurs during a routine visit, and this leads to a late diagnosis (8)(9)(10). There are insufficient studies about impacted premolar prevalence in the literature.…”