Immediate functional loading of single-tooth TiO2 grit-blasted implant restoration. A controlled prospective study in a porcine model. Part II: Histology and histomorphometry.
BACKGROUND
Evidently, there is a fast-moving shift from delayed to immediate implant loading. The hypothesis to be tested was that bone reactions adjacent to single TiO2-microthreaded implants exposed to immediate masticatory loading for 10 weeks after placement would modulate osseointegration.


METHODS
Cylindrical- and tapered-designed implants (Astra Tech AB, Mölndal, Sweden) replaced first and third mandibular premolars respectively in 12 pigs. The animals were allocated into two groups based on soft and hard diet feeding. Each animal received, at random positions, four different masticatory loading conditions: implant with either (1) a cover screw only, (2) a healing abutment, (3) an implant with a crown without occlusal contact, or (4) an implant with a crown in contact with the antagonistic teeth.


RESULTS
Histomorphometry showed that there were no statistically significant differences in bone-implant contact (BIC), bone mass inside/outside of the threads and soft tissue ingrowth ratio for all the implants at 10 weeks after placement irrespective of masticatory loading condition. Bone loss showed a trend of progressive increase for implants with a healing abutment toward implants with occlusal contact.


CONCLUSIONS
The results of this study rejected the hypothesis and could be explained by the fact that grit-blasted acid-etched implants were already placed in dense bone.
Bousdras
Vasilios A
VA
University College London Eastman Dental Institute, 256 Gray's Inn Road, London, England, UK. V.Bousdras@eastman.ucl.ac.uk
Walboomers
Frank
F
Jansen
John A
JA
Cunningham
James L
JL
Blunn
Gordon
G
Petrie
Aviva
A
Jaecques
Siegfried
S
Naert
Ignace E
IE
Sindet-Pedersen
Steen
S
Goodship
Allen E
AE
D016301:Alveolar Bone Loss / Q000209:etiology; D000818:Animals; D015519:Bone Density; D003442:Crowns; D003758:Dental Implantation, Endosseous / Q000379:methods; D019250:Dental Implants, Single-Tooth / Q000009:adverse effects; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D004032:Diet; D008334:Mandible / Q000601:surgery; D008409:Mastication; D023421:Models, Animal; D016348:Osseointegration; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D013499:Surface Properties; D034421:Sus scrofa; D013997:Time Factors; D014025:Titanium; D020390:Tooth Socket
C009495:titanium dioxide; D014025:Titanium