Marginal bone resorption at different treatment concepts using Brånemark dental implants in anterior mandibles.
BACKGROUND
Different implant treatment modalities, one- and two-step surgery, and one-step surgery combined with early functional loading have successfully been used in the anterior mandible for rehabilitation of edentulism. However, the marginal bone remodeling has not been compared among the three different techniques.


OBJECTIVE
The purpose was to compare the marginal bone level in a short- and long-term perspective study using Brånemark dental implants placed according to either a one- or a two-step surgical procedure or a one-step surgical procedure combined with early functional loading.


METHODS
Seven patients were treated with a split-mouth technique with a one-step surgical technique on one side and a two-step technique on the other side. In this latter group, the fixtures were submerged during a 3- to 4-month healing period before abutment connection and loading. In 13 patients, following one-step surgery, the permanent prosthetic suprastructure was connected within 20 days from implant surgery. All patients were operated on by the same surgeon. The level of the marginal bone was radiographically measured relative to the fixture-abutment junction and was followed up to 5 years from fixture installation.


RESULTS
After connection of the supraconstruction, the marginal bone resorption was significantly lower in the early functional loading group compared to the one- and two-step surgical technique groups. However, after 18 months and after 5 years, the marginal bone was located approximately 1 mm apical to the fixture-abutment level in all three groups.


CONCLUSIONS
There was no difference in marginal bone resorption in a long-term perspective between one- and two-step surgical procedures and a one-step surgical procedure with early functional loading of Brånemark dental implants.
Petersson
A
A
Department of Oral Radiology, Faculty of Odontology, Malmö University, Carl Gustafs väg 34, SE-214 21, Malmö, Sweden. arne.petersson@od.mah.se
Rangert
B
B
Randow
K
K
Ericsson
I
I
D016723:Bone Remodeling; D001862:Bone Resorption / Q000145:classification* / Q000000981:diagnostic imaging; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003830:Denture, Partial, Fixed; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007576:Jaw, Edentulous, Partially / Q000534:rehabilitation / Q000601:surgery; D008137:Longitudinal Studies; D008334:Mandible / Q000000981:diagnostic imaging / Q000601:surgery*; D008336:Mandibular Diseases / Q000145:classification* / Q000000981:diagnostic imaging; D011859:Radiography; D013223:Statistics as Topic; D013314:Stress, Mechanical; D014945:Wound Healing
D015921:Dental Implants