|Baltic Dental and Maxillofacial Journal|
September, 2006, Vol. 8, No. 3
© 2006 Stomatologija
Stomatologija 2006; 8 (3): 80-84 356 KB
Effect of the lower third molars on the lower dental arch crowding
Sidlauskas Antanas, Trakiniene Giedre
Increasing lower dental arch crowding with the age is a recognized clinical problem, and one that has become more apparent in recent years as more adults retain their teeth longer. One of the theories is that the erupting third molars push anterior teeth forward and cause their crowding. On the other hand, a number of studies found no correlation between lower third molars and lower incisor crowding. Because of all these contrasting findings this study was started to re-evaluate correlation between third molars presence and lower dental arch crowding. The study group consisted of 91 subjects with an average age 21.01±4.13 years. The individual, quantitative and cast-based analytical registration of crowding was based on the measurements of mesiodistal width of teeth and related to the length of the appropriate segment of the lower dental arch. No statistically significant third molar presence-specific differences were recorded in the lower dental arch crowding between the groups with erupted, unerupted and agenesis of third molars.
Although differences between the groups were not statistically significant, some tendency for crowding in the anterior part of lower dental arch was more expressed in the groups with the presence (erupted 0.57 mm and unerupted 0.74 mm) of third molars, than with agenesis (surplus space 0.03 mm). Nevertheless, the present study do not provide enough evidence to incriminate third molars as being the only or even major etiologic factor in the late lower dental arch crowding.
Key words: crowding, third molars, lower dental arch.
Received: 15 04 2006
Accepted for publishing: 25 09 2006
*Clinic of Orthodontics, Kaunas university of medicine, Lithuania
Ðidlauskas Antanas* D.D.S., PhD, prof., MOrthRCSEd
Trakinienë Giedrë* D.D.S.
Address correspondence to Ðidlauskas Antanas, Clinic of Orthodontics, Kaunas university of medicine, J. Luksos-Daumanto 6, LT 50106 Kaunas, Lithuania.