Relationship between torus mandibularis and number of present teeth

Abstract

— Comparison of incidence of torus mandibularis and average number of present teeth among 2010 consecutive dental patients over 10 yr of age revealed that these variables seemed to be positively related: patients with torus mandibularis had on the average more teeth present than those without torus (P<0.0000001). The difference was statistically significant in all age classes except 50 years and over. In the adolescent age class, 10–19‐yr, patients with torus mandibularis had on the average fewer unerupted canines than those without torus indicating that the hyperostosis seemed to be associated with more adequately developed jaws. The decreasing incidence of torus mandibularis with age approximately paralleled the decreasing number of present teeth, indicating that number of functioning teeth seems to be a factor of importance for the maintenance of the trait.

Exostoses buccales : revue de la littérature

“…Dans la plupart des études, le torus palatin est plus fréquent que le torus mandibulaire, les exostoses palatines et vestibulaires étant rares. La prévalence selon l'âge et le sexe a été étudiée par de nombreux auteurs depuis plus de 60 ans [1,3,10,[17][18][19][20][21][22][23][24][25][26][27]. …”

Exposición espontánea de un torus palatino de la línea media

“…Por otra parte, Axelsson y Ellegard (7) y Karaiscaraiscos, et al (8), reportaron igual frecuencia en los dos tipos. La prevalencia del torus palatino está entre 6 y 8 % en los Estados Unidos y llega hasta 25 % en otras poblaciones del mundo (9)(10)(11)(12).…”

“…Se estima que 10 % de la población puede verse afectada y es más frecuente en mujeres que en hombres (16). Según Eggen y Natvug, son más frecuentes entre los 10 y los 49 años, y de rara aparición después de los 50 (17).…”

Frequency of mandibular tori in the present-day Japanese

“…Some studies compared the prevalence of tori in populations in different environments and concluded that torus percentages were higher in people whose diets included coarser foods than in people with a softer diet (Hooton, 1918;Hrdlicka, 1940;Mayhall, 1970;Eggen and Natvig, 1991). Some studies isolated specific factors that affect the incidence of tori, such as parafunctional activities (clenching and grinding) , temporomandibular disorder (Sirirungrjying and Sugihara et al, 2003), number of teeth (Ossenberg, 1981;Eggen and Natvig, 1986;Sugihara et al, 2003), presence of dental attrition (Taniguchi et al, 1999), presence of crowding (Takano, 2000), area of occlusion contact (Kamouchi et al, 2000), and bone mineral density (Hosoi et al, 2003).…”

“…The frequencies of tori were shown to be significantly higher in patients with parafunctional activities (clenching and grinding) or temporomandibular disorder than in control groups Sirirungrjying and Kerdpon, 1999). Correlations between number of teeth and development of tori were also examined in large samples (Ossenberg, 1981;Eggen and Natvig, 1986;Sugihara et al, 2003). However, conclusions differed among studies.…”