Reduced healing period of Astra-implants to 90 and 56 days

Reduced healing period of Astra-implants to 90 and 56 days
A. SAMIOTIS, M. BATNIJI, and H.G. STEVELING, Universitatsklinik fur Zahn-, Mund-und Kieferheilkunde, Heidelberg, Germany
March 2004
Clinical Implant Studies
Objectives: Reduced healing period of Astra-implants to 90 and 56 days in the upper and lower jaw.
Methods: 65 patients (35 women / 30 men, average age 51,7 years) received 142 implants. The primary stability was determined by resonance-frequency-analysis. With ISQ-values of more than 65.00 (group-A) the healing period for the lower and upper jaw was reduced to 56 days (11 patients / 19 implants). The healing period for the remaining implants (group-B) was 90 days (54 patients / 123 implants). The secondary stability was measured via RFA. The implants of group-A, with higher stability, were immediately loaded. With ISQ-values of less than 65.00 the healing abutment was left for additional 56 days in the sense of progressive loading. In group-B all implants were functionally loaded after a healing period of 90 days.
Results: Group-A reached an average ISQ-value of 69.29 (lower jaw ISQ 71.53 / upper jaw ISQ 67.05). All implants could be supplied with a fixed denture after 56 days. The implants' stability had increased by 1.04 units (ISQ 70.63). The implants' stability of the upper jaw had increased by 1.96 units (ISQ 69.01), whereas in the lower jaw it was only 0.12 units (ISQ 71.65). Group-B reached a mean ISQ-value of 66.58 (lower jaw ISQ 70.77 / upper jaw ISQ 62.39). The secondary stability was increased by 1,67 units (ISQ 68.25) - in the upper jaw by 2.94 (ISQ 65.33) and in the lower jaw by 0.4 units (ISQ 71.77). No implant failed during the healing period of 56 and 90 days as well as during the period of function.
Conclusion: Functional loading of Astra implants after 56 days with an adequate primary stability (ISQ-value higher than 65.00) as well as after 90 days is a predictable and successful treatment for the upper and lower jaw.