Abstract: Objective: To make a retrospective analysis of the clinical aesthetic outcomes between alveolar ridge splitting technique(ARS)and augogenous onlay bone grafting technique(OBG) in the maxillary anteri-or region. Methods: 50 patients for dental implant treatment with either alveolar ridge splitting or augoge-nous onlay bone grafting procedure between January 2013 and January 2015 were included Yantai Stoma-tological Hospita. Of which, 25 patients undergone alveolar ridge splitting surgery with simultenoulsy im-plantation, while 25 patients for augogenous onlay bone grafting surgery received implants 6 months after. Single crown restorations were conducted 4 months after implant surgery. The following-up periods were 24 months, the following parameters were employed for the comparison: implant success rate, implant sta-bility, complications(minor complications: soft tissue fenistration, minor infection, bone fracture, major complications: soft tissue dehiscence, bone necrosis, inordinary sensory), and post operative reactions. SPSS17.0 was used for statistical analysis. Results: The success rates were 88% for alveolar ridge split-ting and 92% for augogenous onlay bone grafting respectively, there was no statistical difference between this two techniques(p>0.05). ISQ value immediately after implantation was 62.31±1.76 for alveolar ridge splitting and 75.12±1.21 for onlay grafting, which demonstrated a statisticaly higher primary stability for the augogenous onlay bone grafting group. 4 months after implant surgery, there was no statistical differ-ence for the ISQ value between this two techniques (83.28±2.15 vs. 82.21±1.53) (p=0.068). There were al-so no differnces for the rates of complications(p=0.214). The VAS evaluation for post-surgery reaction was 3.67 for alveolar ridge splitting and 6.13 for augogenous onlay bone grafting , which demonstrated a higher VAS for the augogenous onlay bone grafting group. Conclusions: Both of the alveolar ridge splitting tech-nique and onlay grafting technique are reliable techniques. The primary stability with augogenous onlay bone grafting is better than ridge splitting technique. There is no significant difference of bone graft bone absorption in the ARS and OBG Groups. Ridge splitting technique is more acceptable for patients consid-ering complications and post operative reactions.

Key words: oral implat, alveolar ridge splitting (ARS), augogenous onlay bone grafting(OBG)