Ciao Alexander

As far as I know, "agenesis" is used always in singular.

Good luck,

Elena


Missing lateral incisors in Iron Age South-East Asians as possible indicators of **dental agenesis**. Nelsen K, Tayles N, Domett K.

Department of Anatomy and Structural Biology, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand.

The absence of lateral incisors is generally a reflection of **agenesis** or hypodontia, with a significant genetic basis and possibly environmental influence on the phenotypic expression...

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...


Midfacial hypoplasia and a pointed chin are characteristic. Alveolar and sutural bone growth in the face is diminished and associated with partial **dental agenesis**.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...