Determination of age in the Japanese monkey from growth layers in the dental cementum

Cold Stress in Captive Great Apes Recorded in Incremental Lines of Dental Cementum

“…These structures, because they are produced in a circa-annual rhythm, are of great value for estimating age-at-death in mammals [2]. Investigations of primate teeth include the genus Macaca [3][4][5][6] and Callithrix [7]. In particular, Kay et al [5] and Kay and Cant [6] have investigated specimens of known individual age and confirmed the high correlation between the number of incremental lines and age-at-death.…”

“…1). In unstained histological sections, hypomineralized light bands correspond to the winter season, while hypermineralized dark bands correspond to the summer season [3]. Since one such dark and light layer together constitute one annual structure, all hypotheses more or less centre around an underlying seasonal rhythm which results in alternating phases of growth and rest in the cementum formation.…”

Cementum Annulus Counts Provide a Means for Age Determination in Macaca mulatta (Primates, Anthropoidea)

“…Many of the teeth, especially incisors and canines, were missing from the mandibles, presumably lost postmortem during prep aration. This and the prior demonstration in Macaca fuscata of annuli in the molar cementum [Wada et al, 1978] led us to select the molars for this study. Our study sample consisted o f a total o f 14 teeth repre senting 6 females and 2 males (table I).…”

“…(In cases o f resorption, damage is usually repaired by formation o f new cemen tum; such repaired areas have a characteristic appearance easily distinguished from typical cementum areas.) The tendency o f cemen tum to form incrementally and not to be resorbed means that a full permanent record o f the life history o f cementum growth is left on the root analogous to the rings in the trunk o f a tree [Schour, 1953], Counts o f cementum annuli have been employed successfully as a means o f estimat ing chronological age for many species of temperate mammals over the past 30 years [Morris, 1978], Recently a few attempts have been made to extend this technique to pri mates [Stott et al, 1980;Wada et al, 1978;Yoneda, 1982], Up until now, however, these have been deficient for either or both o f two main reasons: the animals studied were of unknown age to begin with, or the animals lived under captive circumstances and were not subject to impediments to growth nor mally occurring in feral populations. The re sults reported here address these deficiencies in an effort to assess more fully the value of this technique for primate biology.…”

Estimativa de idade através das linhas incrementais de cemento

“…Enquanto nos dentes saudáveis se observou fibras inseridas no cemento, nos dentes com patologia se observou superfície radicular com diversas convexidades e estruturas desorganizadas e aglomeradas. Kato et al (1992) estudadas utilizando-se a ocorrência das linhas incrementais de dentina ou cemento como critério para estimativa da idade: alce (Sergeant;Pimlott, 1959;Gasaway et al, 1978), caribu (McEwan, 1963), bisão (Novakowski, 1965) urso negro Sauer, 1966;Marks;Erickson, 1966;Sauer et al, 1966;Stoneberg;Jonkel, 1966), veado (Ransom, 1966;Douglas, 1970;Lockard, 1972), coiote (Linhart;Knowlton, 1967), 21 espécies de mamíferos aquáticos (Klevezal;Kleinenberg, 1967), raposa (Monson et al, 1973), lontra (Tabor;Wright, 1977), macacos japoneses (Wada et al, 1978), esquilo (Fogl;Mosby, 1978) marmota (Stott et al, 1980. ) e macacos rhesus (Kay et al, 1984 …”