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Use of 5‐mm‐diameter implants: Periotest® values related to a clinical and radiographic evaluation
Author(s) -
Aparicio Carlos,
Orozco Paulina
Publication year - 1998
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1034/j.1600-0501.1996.090605.x
Subject(s) - osseointegration , radiography , abutment , implant , dentistry , medicine , maxilla , orthodontics , dental abutments , surgery , civil engineering , engineering
A modified design of the original Brånemark implant consisting of a cp. Titanium 5.0‐mm‐diameter self‐tapping implant threaded up to the marginal platform has been proposed for specific indications. From February 1992 to November 1995, a total of 185 machined screw implants (Nobel Biocare, Gothenburg, Sweden) were installed in 45 patients to withstand 58 prostheses. Of these, 91 were 3.75mm diameter and 94 were 5.0mm wide. Most of the implants were placed in type B and C bone quantity and type 2 and 3 bone quality. A retrospective evaluation with regard to indications, marginal bone remodelling, Periotest® values (ID) and survival rate is presented. PTv and radiographic measurements were made at abutment connection and repeated 3, 6 and 12 months later and thereafter every year. The follow‐up ranged from 16 to 55 months (mean 32.9 months) post‐loading. Three patients with 8 5.0mm implants dropped‐out of the study at different stages. Out of the wide implants, 1 was expelled during the healing period; 3 were found mobile at the abutment connection; 1 lost its osseointegration suddenly after 2 years of function; 4 belonging to 1 patient did not meet the success criteria due to continuous marginal bone loss. The cumulative success rate of 5.0mm implants (CSR) after 1 year of function was 97.2% for upper jaws and 88.4% in mandibles, whereas the CSR in maxilla after 48 months was 97.2% and 83.4% in mandibles. The obtained PTv from 5.0mm‐wide fixtures in maxilla and mandibles were respectively 1.1 and 0.6 units lower than those obtained PTv for 3.75mm‐diameter implants in the same patients. The hypothesis that there are differences in the damping capacity of the bone surrounding a 5.0mm‐wide implant compared to the 3.75mm‐diameter implant is supported by the PTv results.