Trata-se de restauração de cárie com resina polimerizada à luz, na face posterior do dente.

Veja estes exemplos:

[PDF] Operative Dentistry, Hassan (General Dentistry, Nov/Dec 2005)
File Format: PDF/Adobe Acrobat
ization shrinkage of photo-activated. restorative materials by a water-filled. dilatometer. ... thetic posterior composite resin restoration ...
www.agd.org/library/2005/nov/Hassan.pdf


BDJ | The survival of resin modified glass ionomer and stainless ...... evaluation of the success rate of posterior composite resin in the primary ... line between a cavity designated as a preventive resin restoration (PRR) ...
www.nature.com/bdj/journal/v198/n7/full/4812197a.html



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Note added at 22 hrs (2006-07-18 14:28:54 GMT)
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Here are some examples to confirm "faces", not "surfaces", as suggested:

Micromachined accelerometer with electrostatic return - Patent 4711128
This metallization comes slightly back onto at least one of the lateral faces of the tooth thus forming a connection area 18a, 18b-19a, 19b which extends ...
www.freepatentsonline.com/4711128.html


[PDF] A Computerized Approach to Reconstruction of Growth Patterns in ...
File Format: PDF/Adobe Acrobat - View as HTML
faces of the tooth, and the program can work with one or more teeth. The program analyzes the structure of the tooth, and performs the following computa- ...
http://bioanthropology.huji.ac.il/pdf/12.pdf


First fossil chimpanzee : Nature
The relative thinness of the enamel can be discerned on the broken mesial and lingual faces of the tooth. The extremely low height of the M1 crown and the ...
www.nature.com/uidfinder/10.1038/nature04008



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Note added at 22 hrs (2006-07-18 14:41:51 GMT)
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If the restoration was made only on the enamel, then you should say "1 surface". However, if it refers to the place on the tooth where it was made, it should be "1 face" (mesial, distal, lateral, posterior, etc.)