Background 
Surgical intervention and radiotherapy(RT) due to oral cancer caused also removing of teeth.  It presents a huge functional and
aesthetically deficit. With prosthetic solutions on implants this could be resolved. Oxygen-hyperbaric-therapy(HBO) is necessary
before and after implantation. 

Aim/Hypothesis 
Our aim was to follow up changes of periimplant vertical bone level after 2 years with orthopanthomogram x-rays at patients who were
under combiene surgical intervention and RT.

Materials and Methods 
Our population consists of 7 complete edentulous patients(3 females/4 males), who have had combiene surgical intervention and
radiotherapy (56-60Gy) of cancer in oral cavity. Implants with conical connection were inserted in mandible more than 1 year after
radiotherapy.  Pacients had 2 or 4  implants being inserted into mandibule (2/5). Two-phase protocol with HBO (20/10) was used
before implantation. Patients received removable prosthetics 6 months after implantation.

Resultats 
Panoramic radiograph was taken 1 week and 24 months after implantation. X-rays were examined with Image-J
program(http://rsb.info.nih.gov). Vertical changes of periimplant bone level were observed on mesial(M) and distal(D) site of the
implant body. Average resorption rate (M/D) was: 2,191/2,166 with standard deviation (M/D):1,391/1,143. No clinical  signs of
inflammation were found in that period.

Conclusions and Clinical Implications 
We concluded that resorption of marginal bone can not be completely avoided at patients with RT.  Implant placement below marginal
bone level are desired but despite HBO resorption can not be avoided. It is also seen that absence of clinical inflammation can not  
guarantee no lost of marginal bone.

X-ray Followed-up of Periimplant Bone Level at Dental Implants in Rehabilited Patients After Combiene Surgical and Radiotherapy of Oral Cancer