I found this at

http://www.medicdirect.co.uk/operations/default.ihtml?pid=1738&step=4

The Caldwell Luc operation used to be a popular operation for chronic
sinusitis, but with improved understanding of the importance of preserving the
mucous membrane it has fallen from favour. The approach is still used, however,
for a variety of other purposes including the removal of foreign bodies from
the sinus, eg, dental amalgam, access to tooth roots, closure of unwanted holes
between tooth sockets and the sinus following removal of teeth, removal of
benign tumours, for access to structures behind the sinus and for treatment of
fractures of the eye socket. It is not performed in children as the permanent
teeth may be damaged.

this at
http://www.co-otolaryngology.com/pt/re/cooto/abstract.00020840-200302000-00005.h
tm;jsessionid=Cilael1yZaj2HIM0UltK3E3TalNmJhx96ortuRZeQLzjPXbDhQ5c!1142682874!-9
49856032!9001!-1

The Caldwell-Luc operation was first described in the late 19th century as a
technique to remove infection and diseased mucosa from the maxillary sinus via
the canine fossa, while creating intranasal counterdrainage through the
inferior meatus. This operation has been performed countless times over the
past century, but it has come under increased scrutiny within the past 20
years. This criticism is multifactorial. Medical management of allergic and
infectious sinus disease has continued to improve, and endoscopic sinus surgery
techniques have proven to be safe and effective in the vast majority of
patients requiring surgical management. Additionally, several retrospective
studies have shown high complication rates with the operation. Recent studies
have illustrated both the histologic benefit of complete removal of diseased
mucosa, as well as better patient outcomes with minimal morbidity when a safer
operative technique is used. Overall, the Caldwell-Luc procedure is safe and
effective as described, and should remain in the repertoire of surgeons
managing the maxillary sinus.

and this from

http://www.sinusnews.com/Articles2/Sinus-Surgery-Fact-Sheet.html

Caldwell Luc operation: Another option is the Caldwell-Luc operation, which
relieves chronic sinusitis by improving the drainage of the maxillary sinus,
one of the cavities beneath the eye. The maxillary sinus is entered through the
upper jaw above one of the second molar teeth. A "window" is created to connect
the maxillary sinus with the nose, thus improving drainage. The operation is
named after American physician George Caldwell and French laryngologist Henry
Luc and is most often performed when a malignancy is present in the sinus
cavity.