The Effect of Embedded Length on Implant Mobility

The Effect of Embedded Length on Implant Mobility
28 June 2003
K. SARATANI1, T. SUMIKAWA2, T. KAWAZOE1, H. OKA3, and S.G. SHI4, 1 Osaka Dental University, Japan, 2 Graduate School, Osaka Dental University, Japan, 3 Okayama University Medical School, Japan, 4 306 Hospital of PLA, Beijing, China
IADR
Objectives: There are no gold standards to choose diameters and lengths of implants. An application of implants whose shape is as thick and long as possible is regarded as better choice by many dentists. We have already developed an Implant Movement (IM) checker which can measure dental implant mobility. The aim of this study was to investigate a relation between embedded lengths and implant mobility. Methods: As imitative implants, bronze cylinders were used. Each diameter of cylinders was 4 mm. Embedded lengths were six kinds (7, 9, 11, 13, 15 and 17 mm). The bronze cylinders were embedded vertically in the bases of resin whose Young's modulus was 100-200 kg/mm2 (Rigolac, SHOWA HIGHPOLYMER, Japan). Each size of bases was 7x7x4 cm. Three models were made per each condition. The implant models were fixed by a vise on same force. IM (Implant Movement) score was measured using IM checker horizontally. Parametric comparisons of IM score in six embedded lengths used One-factor analysis of variance. Results: Significances of individual differences were evaluated by using the Tukey-Kramer test because ANOVA was significant (p<0.01). As a result, significant differences in IM score were observed among 9, 11 and 13 mm (p<0.01). However, there were not significant differences between 7 and 9 mm, and then among 13, 15 and 17 mm either. Conclusions: It was suggested that an increasing the embedded length did not proportionately reduce implant mobility.