Presentation Information
[P-80（E）]Prediction of Occlusal Forces on Implants Using the Occlusal Forces on the Remaining Teeth before Implant Insertion
*Roxana Stegaroiu1, Yoshiaki Arai2, Yuta Yamazaki2, Makiko Takashima2, Koichi Kurokawa1 (1. Department of Oral Health and Welfare, Niigata University Graduate School of Medical and Dental Sciences, 2. Oral Implant Clinic, Medical & Dental Hospital, Niigata University)
[Objective]
Finite element analyses (FEA) of implants and their surrounding bone require the input of the implant occlusal force, which can be measured only after implant insertion. To enable the use of FEA results for treatment planning, this study aims to predict the occlusal forces on implants replacing one missing molar of a free-end edentulous jaw from the occlusal forces on the remaining teeth before implant insertion.
[Method]
This study uses the methodology established in a previous study1). Informed consent was obtained from 15 partially edentulous patients who received an implant-supported single crown in unilateral free-end mandibular spaces, with occlusal support from the remaining natural teeth/fixed restorations on the same and opposite sides. Occlusal forces on each occlusal contact during maximum intercuspation were determined before and after setting the implant-supported crowns, using pressure-sensitive sheets (Dental Prescale, Fuji Photo Film, Tokyo, Japan) and an image scanner (Occluzer FPD-707, Fuji Film). After identifying the occlusal contacts per each tooth/implant, the force values for each mandibular tooth and implant were calculated. Linear regression analyses were performed, by using the occlusal forces on the implant after crown set as the dependent variable and the forces on various groups of teeth as independent variables.
[Results and Discussion]
Simple linear regression analyses showed a significant correlation between the implant occlusal forces and the sum of the forces developed before treatment on the contralateral hemiarch and the contralateral posterior teeth, respectively (p<0.05). The linear regression equation had an y-intercept of 129.231 and slope of -0.215 in the former analysis and 126.845 and -0.217, in the later. The model fit was moderate and it slightly improved in the multiple linear regression with the two independent variables (r2=0.411, p<0.05). The results suggest that, for partially edentulous patients with one implant-supported single crown in unilateral free-end mandibular spaces, implant forces range after treatment could be estimated from the occlusal forces on the contralateral hemiarch and the contralateral posterior teeth before implant insertion.
[References]
1) Stegaroiu R, Arai Y, Yamazaki Y, et al. Prediction of Implant Occlusal Forces in the Treatment Planning Phase. J Dent Res, Vol. 99 (Spec Iss A): 822; 2020.
Finite element analyses (FEA) of implants and their surrounding bone require the input of the implant occlusal force, which can be measured only after implant insertion. To enable the use of FEA results for treatment planning, this study aims to predict the occlusal forces on implants replacing one missing molar of a free-end edentulous jaw from the occlusal forces on the remaining teeth before implant insertion.
[Method]
This study uses the methodology established in a previous study1). Informed consent was obtained from 15 partially edentulous patients who received an implant-supported single crown in unilateral free-end mandibular spaces, with occlusal support from the remaining natural teeth/fixed restorations on the same and opposite sides. Occlusal forces on each occlusal contact during maximum intercuspation were determined before and after setting the implant-supported crowns, using pressure-sensitive sheets (Dental Prescale, Fuji Photo Film, Tokyo, Japan) and an image scanner (Occluzer FPD-707, Fuji Film). After identifying the occlusal contacts per each tooth/implant, the force values for each mandibular tooth and implant were calculated. Linear regression analyses were performed, by using the occlusal forces on the implant after crown set as the dependent variable and the forces on various groups of teeth as independent variables.
[Results and Discussion]
Simple linear regression analyses showed a significant correlation between the implant occlusal forces and the sum of the forces developed before treatment on the contralateral hemiarch and the contralateral posterior teeth, respectively (p<0.05). The linear regression equation had an y-intercept of 129.231 and slope of -0.215 in the former analysis and 126.845 and -0.217, in the later. The model fit was moderate and it slightly improved in the multiple linear regression with the two independent variables (r2=0.411, p<0.05). The results suggest that, for partially edentulous patients with one implant-supported single crown in unilateral free-end mandibular spaces, implant forces range after treatment could be estimated from the occlusal forces on the contralateral hemiarch and the contralateral posterior teeth before implant insertion.
[References]
1) Stegaroiu R, Arai Y, Yamazaki Y, et al. Prediction of Implant Occlusal Forces in the Treatment Planning Phase. J Dent Res, Vol. 99 (Spec Iss A): 822; 2020.