Journal of Peking University(Health Sciences) ›› 2014, Vol. 46 ›› Issue (5): 720-726.

• Articles • Previous Articles     Next Articles

Implanting the edentulous jaws with “All-on- 4” immediate reconstruction: a preliminary clinical observation

ZHAO Xu, DI Ping△, LIN Ye, LI Jian-Hui, Qiu Li-Xin, LUO Jia, CUI Hong-Yan   

  1. (Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing 100081, China)
  • Online:2014-10-18 Published:2014-10-18

Abstract: Objective: To evaluate the treatment outcome of the “All-on-4” immediate loading protocol via survival rate of the implants,survival rate of the prosthesis,marginal bone, postoperative complications and patient satisfaction.Methods: In our study, 40 patients with 49 edentulous jaws (31 mandibles and 18 maxillae) were enrolled. Each jaw was restored by the shortened dental arch prosthesis supported by only 4 implants according to the All-on-4 protocol (All-on-4, Nobel Biocare AB, G-teborg, Sweden). For all the patients enrolled in the study,the loading was applied within 12 hours of surgery. The provisional prosthesis could be replaced by the final restorations within 6 to 12 months. In the present study, the survival rate of the both implants and restorations were calculated and analyzed. The radiographic evaluation of marginal bone level changes was measured. The values of the marginal bone level changes of the angled and axial implants were analyzed by the statistic software.Results: In the present study, totally 196 implants were inserted, of which 13 implants failed during the whole following up periods, with 11 implants of the maxillae and 2 of the mandibles. The survival rate of the prosthesis was 95.9% (47/49). The implant survival rate of the maxillae was 85.5%(65/76)while that for the mandibles was 98.3%(118/120). The implant survival rate of the angled implants was 91.8% (90/98), while that for the straight implants was 95.0% (93/98). No significant difference in marginal bone loss was found between angled and axial implants in the 12-month evaluation according to the Wilcoxon rank sum test (P>0.05). During the follow-up period,mechanical complications as fracture of the provisional prostheses, loose of the retain screw, or crack of the artificial teeth were found in 20 prostheses.Conclusion: The present preliminary data of the short term observation suggest that the “All-on-4” immediate loading protocol is a viable treatment modality for the edentulous jaws. However, long term clinical random controlled trials with large samples are still needed to confirm the validity of the technique.

Key words: Jaw, edentulous, Immediate dental implant loading, Bone resorption

[1] Feng LIANG,Min-jie WU,Li-dong ZOU. Clinical observation of the curative effect after 5-year follow-up of single tooth implant-supported restorations in the posterior region [J]. Journal of Peking University (Health Sciences), 2021, 53(5): 970-976.
[2] WU Min-jie, ZOU Li-dong, LIANG Feng. Clinical observation on soft and hard tissue changes of immediate implantation and immediate reconstruction in anterior region after loading 3 years [J]. Journal of Peking University(Health Sciences), 2018, 50(4): 694-699.
[3] JIANG Xi, LIN Ye, ZHANG Yu, DI Ping, CHEN Bo, HU Xiu-lian, LUO Jia, REN Shu-xin, OUYANG Si-yuan. A novel technique to preserve the alveolar ridge width following tooth extraction in the maxillary frontal area [J]. Journal of Peking University(Health Sciences), 2016, 48(1): 175-179.
[4] LI Bei-bei, LIN Ye, CUI Hong-yan, HAO Qiang, XU Jia-bin, DI Ping. Clinical evaluation of “All-on-Four” provisional prostheses reinforced with  carbon fibers [J]. Journal of Peking University(Health Sciences), 2016, 48(1): 133-137.
[5] JIANG Xi, LIN Ye, HU Xiu-Lian, DI Ping, LUO Jia, LI Jian-Hui. Computer-assisted implant restoration of free-end partially edentulous mandible with severe vertical bone deficiency [J]. Journal of Peking University(Health Sciences), 2014, 46(2): 294-298.
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