Slight numbness in lower lip after implant placement. what is to be done ?

Greetings to all ye implant gurus.

I placed 4.5 x 10mm SS III ostem implant in 4-6 (LR first molar) & 5 x 10 SS III

Greetings to all ye implant gurus.

I placed 4.5 x 10mm SS III ostem implant in 4-6 (LR first molar) & 5 x 10 SS III

osstem  implant in 3-6 (LL first molar) for this patient on 9^th July 2014.

Patient is 26 year old female.

No relevant medical history.

The bone in 4-6 area was deficient bucco lingually & so I took an ostem spreader & widened it. I also took on ostem osteotome & hammered it gently with a mallet & expanded it bucco lingually & placed a 4.5 x 10mm SS III implant.

It seems unlikely that I touched the inferior alveolar news during bone expansion.

My staff makes a routine courtesy call every night before we close the clinic to all our patients who have undergone surgery . Patient said that she was fine & the effect of L.A went away within two &half hours. She was not feeling any residual numbness.

She took the antibiotics & NSAID’ as prescribed .

Pt. was called on 16^th evening for follow up.

Pt. reported on 18^th evening & said that her lower lip on left side was feeling slightly numb.

Note that she is feeling numb only from the angle the lip to the midline on left side i e areas innervated by mental nerve. I prescribed  B complex capsules & asked for on OPG which is in the end  of this post.

The OPG does not show the implant close to the inferior alveolar nerve.

So now I want to know what could be the cause & what should be the future course of action.

Thanks in advance for all responses.

Dr. Veerendra Darakh