Abstract: Abstract Objective: Investigate the reasons and treatment methods for the mechanical complications of Ankylos implant system’s abutment . Methods: From 2005 to 2010, the incidence of all kinds of abutment’s mechanical complications and their treatments were summarized in this paper. Analyse the reasons and characteristics of the abutment’s mechanical complications of the Ankylos implant system with statistics. Explain the methods and the matters needing attention of dealing with these complications. Results: There were significant differences with the incidence of abutment’s mechanical complications ,male more than female(2.82% vs 0.67%，P＜0.05),posterior more than anterior zone（2.53% vs 0.80%，P＜0.05）,Balance posterior abutments more than Standard abutment（4.32% vs 0.44%，P＜0.05） and Balance anterior abutments （4.32% vs 0.80%，P＜0.05）.All the mechanical complications have been solved,and no abnormal symptoms have been found in the follow-up period. Conclusions: There are uniqueness of the reasons and treatment methods for the mechanical complications of Ankylos implant abutment. Standard abutment should be preferred in the posterior zone of male. The proposed methods are simple and effective, no damage to implant’s internal structure, no increase instrument and equipment, patients satisfied with a median follow-up, are worthy to be popularized in the clinical work.

Key words: platform-switching, abutment, mechanical complication