Primary stability of implants placed at different angulations in artificial bone.
BACKGROUND
The aim of this study was to evaluate the primary stability (PS) of titanium implants with a progressive thread design and more thread stability in the apical threads placed in artificial bone materials.


METHODS
A total of 120 implants were placed in commercially available polyurethane composite bone blocks. The angulations that were chosen to place the implants in bone types II and IV were 0, 10, and 20 degrees, respectively. The implant dimensions were 11 mm in length and 3.5 mm in diameter. Two clinicians placed all implants, and an independent examiner evaluated the PS using the Osstell (ISQ) and Periotest devices. The χ test was used to evaluate the statistical differences between the PS at different angulations.


RESULTS
This study showed that there was a statistically significant difference (P = 0.02) of the PS values, when measured using the Periotest values, among all 3 angulations in both bone qualities. Tilted implants with 10 degrees, angulation had a better stability than conventionally placed implants.


CONCLUSIONS
The PS of dental implants is higher for implants placed in type II when compared with type IV artificial bone. A higher stability was found for implants placed with 10-degree angulations.
*Resident and Research Fellow, Division of General Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY. †Resident, Division of General Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY. ‡Professor and Program Chair, Division of General Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY. §Professor, Department of Periodontology, School of Dental Medicine, Stony Brook University, Stony Brook, NY.
Ajay
A
Kashi
Bhumija
B
Gupta
Hans
H
Malmstrom
Georgios E
GE
Romanos
D018786:Bone Substitutes; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D003799:Dental Stress Analysis; D011140:Polyurethanes
D018786:Bone Substitutes; D015921:Dental Implants; D011140:Polyurethanes