Evaluation of effect of the crown to implant ratio on marginal bone level in short implants in the posterior area of the mandible

 
Abstract




Introduction:


Implants in the posterior atrophic areas of the jaw often require short dental implants, which leads to an increase in the crown-to-implant ratio and mechanical stresses. Short dental implants are associated with a higher risk of biomechanical complications and implant failure, however, the use of short implants has become increasingly common due to anatomical limitations and the need to avoid surgical reconstruction of atrophic ridges. One of the biomechanical complications is  marginal bone loss, and one of the risk factors related to it is the crown-to-implant ratio. The leading research seeks to evaluated  the effect of the crown-to-implant ratio on the marginal bone level in short implants in the posterior area of the mandible.
 



Materials
& methods:

In this study, which was conducted retrospectively, 38 patients referred to a private practice who were treated with short implants in the lower jaw in 1401 and 1402 and were studied with a 12-month follow-up after loading prosthesis. Panoramic graphs of the patients at the time of receiving the implant and parallel periapical graphs that were prepared one year after loading the prosthesis. MBL (Marginal Bone Loss) and C/I-R (Crown/Implant-Ratio) were measured in parallel periapical radiographs in Romexis viewer software. The results were analyzed by SPSS26 software, Pearson correlation, multiple linear regression, and t-test (α = 0.05). 



Results:

In this study, 38 patients receiving short implants in the lower jaw (86.8% female and 13.2% male) with an average age of 53.68±9.09 years were investigated. The amount of marginal bone loss in implants with C/I-R less than 1.5  is equal to 1.1±1.14 mm and in implants with more than 1.5  it is 1.04±0.63 mm. There is no significant relationship between C/I-R and MBL values. The effect of C/I-R in MBL values ​​is not significant at the 0.05 level (P-value>0.05).



Conclusion:


In this study, it was shown that the crown-to-implant ratio has no significant effect on the marginal bone level in short implants in the posterior area of the mandible.
 



Key Words: short implant, Marginal Bone Loss ,  Crown/Implant-Ratio