الفهرس 
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Abstract
Endoscopic DCR procedures were developed in the 1980s and
1990s. The endoscopic approach eliminates the necessity for a
cutaneous incision and allows the surgeon to dissect and marsupialize
the lacrimal sac more precisely. With success rates equivalent to the
external technique, endoscopic DCR has gained favor as a treatment
for nasolacrimal duct obstruction.
Endoscopic DCR (endo-DCR) has the advantages of no external
incision and scar, no disturbance of tear pump anatomy, and the
capacity to examine, diagnose, and treat endonasal pathology like
septal deviation or middle turbinate hypertrophy. The cost of
instrumentation, the steep learning curve of endonasal procedures, and
the difficulty of suturing the lacrimal sac-nasal mucosal flaps are all
disadvantages of endoscopic DCR. Despite these drawbacks, success
rates of up to 94 percent have been reported with enhanced
instrumentation and technological developments.
Ologen is a porcine collagen implant that is biodegradable and
porous. It affects the fibrosis process by regulating secreted
extracellular matrix deposition and influencing fibroblast migratory
patterns.
The purpose of this work is to compare the effectiveness of
endoscopic dacryocystorhinostomy with ologen implant versus
endoscopic dacryocystorhinostomy with silicon tube implantation.
To the best of our knowledge this is the first paper to evaluate
efficacy of ologen in endoscopic DCR, our result shows that
endoscopic DCR with ologen implantation is not superior to
endoscopic DCR with silicon stenting due to the challenging ologen