We are using cookies to implement functions like login, shopping cart or language selection for this website. Furthermore we use Google Analytics to create anonymized statistical reports of the usage which creates Cookies too. You will find more information in our privacy policy.
OK, I agree I do not want Google Analytics-Cookies
The International Journal of Oral & Maxillofacial Implants



Forgotten password?


Int J Oral Maxillofac Implants 25 (2010), No. 6     15. Dec. 2010
Int J Oral Maxillofac Implants 25 (2010), No. 6  (15.12.2010)

Page 1137-1144, PubMed:21197490

Effect of Splinting Mini-Implants on Marginal Bone Loss: A Biomechanical Model and Clinical Randomized Study with Mandibular Overdentures
Jofre, Jorge / Cendoya, Patricio / Muñoz, Paola
Purpose: This aim of this study was to evaluate the effect of splinting mini-implants on marginal bone loss when used to retain mandibular overdentures.
Materials and Methods: With mathematical models, a finite element analysis was performed to compare the bone stress distribution around two miniimplants, either splinted with a bar superstructure or not splinted. In the clinical portion of this study, 90 mini-implants were placed in the anterior mandibles of 45 completely edentulous patients selected from a public health center. Patients were randomly allocated into two groups. Group-ball (22 patients, n = 44) received two single ball-type mini-implants, and group-bar (23 patients, n = 46) received two mini-implants splinted with a prefabricated bar. All implants were placed using a flapless technique and loaded immediately. Marginal bone loss was assessed through standardized retroalveolar radiographs of each mini-implant and compared 5, 10, 15, and 24 months after implant placement.
Results: The finite element analysis showed the highest minimum principal stress (-118 MPa) in bone surrounding the unsplinted mini-implant, while around the splinted implants the principal stresses were -56.8 MPa. After 2 years of follow-up in the clinical study, group-ball showed a trend toward greater marginal bone loss than group-bar (1.43 ± 1.26 mm and 0.92 ± 0.75 mm, respectively). Group-ball showed a significantly higher prevalence of vertical bone loss than group-bar (chi-square test, two-tailed).
Conclusion: Splinted mini-implants with a rigid superstructure decrease the bone stress level in comparison with single mini-implants. The effects of bone stress magnitude may explain the clinical outcome, in which splinted mini-implants supporting a mandibular overdenture showed less marginal bone loss compared with nonsplinted mini-implants. Vertical bone resorption morphology was significantly more prevalent in the latter group.

Keywords: biomechanics, marginal bone loss, mini-implant, overdentures, splinting