Presence of third molar germs in orthodontic patients in Japan

Evaluation of the Relationship Between Sagittal Anomalies and the Presence of Third Molars in Two Different Periods in Turkish Orthodontic Patients

“…This finding is compatible with those of Kajii et al (16) and Kermani et al (20). There seems to be a difference in third molar agenesis in the maxillary and mandibulary arches between Asians and European Americans.…”

“…However, these variations between the groups 1 and 2 were not statistically significant. A reduction in this level over the years is compatible with the findings of Kajii et al (16). The prevalence of all third molars in the two groups in the current study was lower than that found by Kajii et al (16).…”

“…In the present investigation, the percentage of subjects with both mandibular third molar germs was significantly higher than the percentage with both maxillary third molar germs. Some reports have indicated that there is the same tendency in the Japanese (16,19,26) and Jordanian populations (13). On the other hand, many studies (3,7,11,27,29) have demonstrated that mandibular third molar agenesis is lower than maxillary third molar agenesis in the European American population.…”

“…There have been many reports describing the congenital absence of third molars in European American (3,7,11,27,29) and Asian (13,16,17,26) patients. Unfortunately, there have been few reports on chronological changes in third molar agenesis (9,21).…”

Skeletal Facial Morphology and Third Molar Agenesis

“…Similarly, Kajii et al (2001) reported that percentage of skeletal Class III subjects who had all 4 third molars was lower than those of skeletal Class I and Class II subjects (5). While of the subjects with skeletal Class III jaw relationship 29% had 1 or more third molar agenesis, 19.3% of the skeletal Class II subjects, and 21.8% of the skeletal Class I subjects had agenesis of the third molars.…”