Evaluation of the Alteration of Occlusal Distribution in Unilateral Free-End and Intermediate Missing Cases

Abstract

The present study aimed to evaluate the effect of implant prostheses on the occlusal force and area as well as the distribution of occlusal loading in unilateral free-end and intermediate missing cases. Fourteen healthy subjects (7 free-end missing cases in the first and second molars and 7 intermediate missing cases in the first molar region) were included. Six months after the implant prosthesis was placed, an occlusal evaluation was performed with or without the implant superstructure by using Dental Prescale film and an occluder device. In free-end missing cases, the total occlusal force and area, implant-side occlusal force and area, and implant-side occlusal force and area of the residual natural teeth were significantly affected by the implant prostheses. In intermediate missing cases, the implant-side occlusal force of the residual natural teeth was significantly affected by the implant prostheses. In free-end missing cases, the proportions of implant-side occlusal force, non-implant-side occlusal force, and implant-side occlusal force of the residual natural teeth relative to the total occlusal force were significantly affected by the implant prostheses. In the intermediate missing cases, the proportion of the implant-side occlusal force of the residual natural teeth relative to the total occlusal force was significantly affected by the implant prostheses. The proportion of the occlusal area was also significantly affected. In free-end missing cases, implant prostheses significantly increased the occlusal force and area, which resulted in the proper occlusal distribution. In intermediate missing cases, an implant prosthesis may only improve the same-side occlusal loading of the natural teeth.

Digital Occlusal Load Analysis in Dental Arches Restored with Single Implant Supported Restoration Using Two Occlusal Schemes. (T-Scan in-vivo study)

“…While during strong chewing, the force on the implant and adjacent tooth was comparable with no gap between them. So, the force on the implant and adjacent tooth had finally become comparable, but if the gap is more than 20um, the load distribution on the adjacent tooth would be more than that on the implant (10) .…”

Application in the analysis of the occlusal force of free-end missing tooth implant restoration with T-SCAN III

“…When these teeth are missing, the maximum biting force shifts forward. Studies (Kon et al, 2017) have shown that restoration of free-end posterior teeth can reduce the occlusal load of the remaining natural teeth.…”

“…When these teeth are missing, the maximum biting force shifts forward. Studies ( Kon et al, 2017 ) have shown that restoration of free-end posterior teeth can reduce the occlusal load of the remaining natural teeth. Therefore, implant restoration of the free-end missing posterior teeth may protect the adjacent natural teeth.…”

Construction and Application of the Multi-Intermediate Multi-media English Oral Teaching Mode

“…This phenomenon is very prominent in rural areas and even some third and fourth cities (Jiang W, Zhang J, Lv X, 2018). The disadvantage is that oral training is only a task rather than teacher-student and active communication within the heart (Kon K, Shiota M, Sakuyama A, 2017). Part of the teaching model introduced foreign teachers, which solved a teacher's problem to a certain extent but did not promptly guide and encourage students, which to some extent caused resources to be fully occupied by only a small number of highly motivated students and cannot make oral English training a full-…”