SOLO STUDENT DAMAGED ACFT. INSTRUCTOR FLIES ACFT TO HOME PORT.

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I WAS SOLOING MY STUDENT FOR HIS FIRST SOLO. HE MADE A CTLED TKOF; A VERY GOOD PATTERN AND AN EXCELLENT LNDG WITHIN THE FIRST 1/3 OF A 6000 FT RWY. AS HE APPLIED PWR FOR THE TKOF; HE FAILED TO MAINTAIN DIRECTIONAL CTL AND LEFT THE RWY ON THE L SIDE. HE NEVER GOT AIRBORNE. HE REALIZED THAT HE WAS OUT OF CTL AND PULLED THE PWR OFF. THE L SIDE OF THE RWY WAS FRESHLY PLOWED AND VERY SOFT. THE ACFT TIPPED AND STRUCK THE L WINGTIP; BREAKING THE PLASTIC FAIRING AND DAMAGING ABOUT 8 INCHES OF THE LEADING EDGE. AFTER MOVING THE ACFT OUT OF THE FIELD TO FIRM GND; INSPECTED THE DAMAGE AND TAXIED THE ACFT TO THE TIE-DOWN AREA AND FURTHER INSPECTED THE ACFT. I CALLED THE MECH AND EXPLAINED THE DAMAGE. HE SAID IT WOULD BE OKAY TO FLY IT BACK TO THE HOME ARPT (2.6 AIR MI). I TESTED ITS FLT CHARACTERISTICS IN GND EFFECT AND ASCERTAINED IT WAS SAFE TO FLY TO THE HOME ARPT FOR REPAIR. I BELIEVED; AS PIC AND HAVING THE FINAL AUTH TO MAKE THE DECISION; THAT IT WAS AIRWORTHY; THAT I ACTED PROPERLY. AFTER THE FLT I HAVE LEARNED; SINCE THE ACFT WAS DAMAGED I DID NOT HAVE THAT AUTHORITY.