A prospective 1-year clinical and radiographic study of implants placed after maxillary sinus floor augmentation with bovine hydroxyapatite and autogenous bone.
OBJECTIVE
The purposes of this study were 1) to evaluate the survival rate of implants placed in maxillary sinuses augmented with bovine hydroxyapatite and autogenous bone 6 months before implant surgery and 2) to estimate dimensional changes of the bone graft with time using a new radiographic method.


METHODS
Thirty maxillary sinuses in 20 consecutive patients with severe resorption (mean, 3.8 mm of remaining alveolar bone) were augmented with a mixture of 80% bovine hydroxyapatite and 20% autogenous bone mixed with fibrin glue to enable the placement of screw-shaped dental implants. After 6 months of primary healing, 108 implants were placed and followed with clinical and radiographic examinations during the first year of loading. Measurements of changes in height, width, and length of the grafted material were made on tomographic Scanora (Soredex Orion Corporation Ltd, Helsinki, Finland) and panoramic radiographs taken 3 and 12 months after grafting and after 1 year of bridge loading.


RESULTS
Ten implants in 6 patients were lost during the study (9 before loading and 1 after 1 year of functional loading), for a survival rate of 90.7%. All patients received fixed restorations, and the bridge survival rate was 100% after 1 year of loading. Small (<10%) but statistically significant dimensional changes in the grafted material were seen during the study period.


CONCLUSIONS
Acceptable short-term results can be obtained with implants placed after the use of bovine hydroxyapatite and autogenous bone for maxillary sinus floor augmentation. These grafts show good resistance to resorption.
Hallman
Mats
M
Clinic for Oral and Maxillofacial Surgery, Public Health Service, Gävle City, Sweden. mats.hallman@lg.se
Hedin
Måns
M
Sennerby
Lars
L
Lundgren
Stefan
S
D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery; D000818:Animals; D016025:Bone Transplantation; D002417:Cattle; D016009:Chi-Square Distribution; D002680:Chin / Q000601:surgery; D003758:Dental Implantation, Endosseous; D015921:Dental Implants / Q000009:adverse effects; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003830:Denture, Partial, Fixed; D017886:Durapatite; D005260:Female; D006801:Humans; D015993:Life Tables; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging / Q000601:surgery*; D008875:Middle Aged; D013516:Oral Surgical Procedures, Preprosthetic / Q000009:adverse effects / Q000379:methods*; D017060:Patient Satisfaction; D011446:Prospective Studies; D011861:Radiography, Dental; D013530:Surgical Wound Infection
D015921:Dental Implants; D017886:Durapatite