A retrospective study on the treatment outcome of wide-bodied implants.
OBJECTIVE
This retrospective study documented the 5-year cumulative survival rate (CSR) of 5-mm-diameter wide-bodied implants in posterior jaws as related to identified risk factors and relative host bone site dimensions.


METHODS
Sixty-four wide-bodied implants placed consecutively in the posterior jaws of 43 patients were matched using several identified risk factors with 64 regular-diameter implants (3.75-mm or 4-mm diameter) placed in the posterior jaws of 25 of the same patients and 14 others. Life table analyses were undertaken to examine the difference in CSR between the groups. Multivariate Cox regression was conducted to assess the relationship between potential risk factors and overall CSR.


RESULTS
Ten of the wide-bodied implants failed (CSR 80.9%), while two of the regular-diameter implants failed (CSR 96.8%). The difference between the groups was statistically significant. Multivariate analysis demonstrated a significant predictive relationship between overall CSR and the ratio of implant volume to remaining bone volume. This suggests that relative determinants of critical bone volume to implant dimensions may need to be considered when planning implant surgery.


CONCLUSIONS
Wide-bodied implants placed in the posterior jaw can suffer a significantly elevated risk of implant failure compared to regular-diameter implants. This susceptibility may relate to either implant design or the relative relationship of implant to host bone dimensions.
Shin
Sang-Wan
SW
Faculty of Dentistry, University of Toronto, Ontario, Canada. swshin@korea.ac.kr
Bryant
S Ross
SR
Zarb
George A
GA
D000293:Adolescent; D000328:Adult; D000368:Aged; D015519:Bone Density; D016022:Case-Control Studies; D003724:Dental Arch / Q000601:surgery; D015921:Dental Implants / Q000706:statistics & numerical data; D017267:Dental Prosthesis Design / Q000706:statistics & numerical data; D019232:Dental Restoration Failure; D006801:Humans; D015993:Life Tables; D008875:Middle Aged; D015999:Multivariate Analysis; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012307:Risk Factors; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome
D015921:Dental Implants