The incidence of agenesis and polygenesis in the primate dentition

Lavelle, C.L.B.; Moore, William

doi:10.1002/ajpa.1330380304

Cited by 60 publications

(36 citation statements)

References 39 publications

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“…This type of rapid tooth wear is not uncommon among the Beza Mahafaly ring-tailed lemurs Sauther, 2004, 2006]. We also documented 4 examples (blue 127 and blue 136, green 459 and green 209) of dental agenesis (the congenital absence of a tooth [Lavelle and Moore, 1973]) in the Beza Mahafaly population. At Tsimanampesotse National Park, 3 of 25 individuals exhibited agenesis.…”

Section: Dental Variationmentioning

confidence: 79%

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Somatic Variation in Living, Wild Ring-Tailed Lemurs (Lemur catta)

Sauther¹,

Cuozzo²

2007

IJFP

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While understanding somatic variability among wild primates can provide insight into natural patterns of developmental plasticity, published data for living populations are rare. Here we provide such information for two distinct wild populations of Lemur catta. Variants observed include microtia, athelia, and female virilization. Dental variants observed include individuals with supernumerary teeth, rotated teeth, maxillary incisor agenesis, and severe malocclusion. There was a sex bias in incisor agenesis, with 5 of 7 examples (71%) found in males. The frequency of dental variants in our sample is lower than that seen in many other lemuriformes, as well as other primates. This may be a product of their less derived dental formula and/or their relatively fast dental development. Amassing such data is a critical first step to assess if wild primate populations are exhibiting normal variability or are being affected by potential inbreeding and/or environmental effects.

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Section: Dental Variationmentioning

confidence: 79%

“…For example, Lavelle and Moore [1973] reported an 11.1% frequency of agenesis in modern humans, and a 7.9% frequency in Colobus. Jablonski [1992] reported a 33.3% frequency of premolar agenesis in a sample of Rhinopithecus roxellana.…”

Section: Dental Variationmentioning

confidence: 99%

Somatic Variation in Living, Wild Ring-Tailed Lemurs (Lemur catta)

Sauther¹,

Cuozzo²

2007

IJFP

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“…In particular, in 350 specimens of macaques (M. mulatta, M. sinica, and M. irus (= M. fascicularis)), they detected no case of molar agenesis. Although Lavelle and Moore (1973) did not indicate which molars were missing, they stated that the anomalies in the molar teeth were almost all in the third molar region. Hence, congenitally missing first molars must be an extremely rare phenomenon in non-human primates, if it occurs at all.…”

Section: Discussionmentioning

confidence: 97%

“…When molars are congenitally missing, nearly all the cases are upper or lower third molars. Lavelle and Moore (1973) reported prevalence of tooth agenesis in extant primates. Their data indicated that molar agenesis is quite rare in non-human primates.…”

Section: Discussionmentioning

confidence: 99%

“…The first molar is the central tooth in the deciduous/permanent molar domain (dp3, dp4, M1, M2, M3), and is considered to be the last molar that becomes missing (Fujita et al, 1995). Dental agenesis in non-human primates has been studied much less than in humans, but the abovementioned general rule also seems to be applicable to cases of dental agenesis in non-human primates (Lavelle and Moore, 1973;Miles and Grigson, 1990;Jablonski, 1992). But is this rule always true?…”

Section: Introductionmentioning

confidence: 99%

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Familial agenesis of mandibular first molars in Japanese macaques (Macaca fuscata)

Kunimatsu

Yamamoto

2011

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We report in this paper two unusual cases of M 1 agenesis recently discovered in Japanese macaques (Macaca fuscata). Molar agenesis is the congenital absence of molars. In general, molar agenesis occurs from the posterior molars. In most cases, missing teeth are third molars. Second molars may occasionally be absent in addition to the third molars. However, the congenital absence of first molars is hardly observed in humans, and to our knowledge, no case has been reported in other primates. In addition to the rareness of first molar agenesis, the present cases in M. fuscata are also quite unusual, because the posterior molars (M 2 and M 3 ) were completely preserved in contrast to the ordinary pattern of molar reduction. Interestingly, the two cases of the present study were observed in a single maternal lineage (a mother and her son), suggesting that M 1 agenesis in these Japanese macaques is genetically inherited.

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Velocardiofacial syndrome with single central incisor

Oberoi

Vargervik

2004

American J of Med Genetics Pt A

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Three siblings and their mother are reported who all had cytogenetically proven velocardiofacial syndrome (VCFS). One boy had normal dental and craniofacial findings, except for an increased cranial base angle. His sister had only one central incisor in the maxilla. One central incisor had also been missing in the primary dentition. She had no labial frenulum present. Cephalometry showed a small maxillary unit length indicating mild maxillary hypoplasia, an increased anterior face height, steep mandibular plane angle, retruded chin, and a large cranial base angle. Dental measurements showed retroclined lower incisors and increased interincisal angle. A second sister had a cleft of the secondary palate. All permanent teeth were present with the exception of a missing central incisor in the lower jaw: the single lower central incisor was situated in the midline. Her cephalometry showed similar findings as in her sister. All three siblings required palate surgery for speech. Mother was not available for detailed dental and other oral investigations. A single maxillary central incisor has previously been reported in VCFS, but to our knowledge a single central incisor in the mandible has not been reported previously in this entity.

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The incidence of agenesis and polygenesis in the primate dentition

Cited by 60 publications

References 39 publications

Somatic Variation in Living, Wild Ring-Tailed Lemurs (Lemur catta)

Somatic Variation in Living, Wild Ring-Tailed Lemurs (Lemur catta)

Familial agenesis of mandibular first molars in Japanese macaques (Macaca fuscata)

Velocardiofacial syndrome with single central incisor

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