Digital occlusal analysis of pre and post single posterior implant restoration delivery: A pilot study

Abstract

Objectives The purposes of this study were to analyze the effects of single posterior implant restorations delivery on the redistribution of bite force and to evaluate the changes in occlusal force distribution of prostheses and potential influencing factors on occlusion variation at different stages. Materials and methods Thirty-two single posterior restorations in 30 participants (18 women and 12 men aged 27 to 75 years) were placed into either a unilateral single-tooth defect (n = 17) or on either side of a bilateral teeth defects (n = 15). The bite force (%) of the prostheses, teeth and segments at the maximum intercuspation position (MIP) was evaluated using a T-scan at 5 stages (pre-placement, immediately following placement, and 2 weeks, 3 months, and 6 months post-placement). Results The occlusal force of implant-supported prostheses was significantly (P = .000) lower than those of the control natural teeth at the baseline, then no significant difference was found with that of the mesial teeth at 3 months, and finally it was significantly (P = .000) lower than that of the distal teeth at 6 months; meanwhile, it significantly (P = .008) increased by a mean of 2.04 times from 2 weeks (3.39 ± 2.61%) to 3 months (6.90 ± 4.77%), whereas no significant difference (P = .900) was found from 3 months (6.90 ± 4.77%) to 6 months (7.31 ± 4.60%). In addition, the bite force of the posterior segment on the restored side of both unilateral and bilateral gaps was significantly (P = .013,.001) improved by 3.31% and 6.83%, respectively, although the discrepancy in bite force significantly (P = .039) increased from an initial 3.52% to 5.02% for subjects with bilateral defects, accompanying increases in the proportion (15.38%) of the level III bilateral bite force deviation (P >.05). Conclusions Bite force and masticatory ability can be improved with the immediate delivery of a single posterior implant restoration. The bite force distributed on the implant prosthesis inevitably increases after placement of implant prostheses, a routine follow-up and occlusal evaluation are strongly needed.

Evaluation and Correlation of Bite Force With Electromyography (EMG) Activity Before and After Rehabilitation of the First Molar With an Implant-Supported Prosthesis

“…Also, the change in mean MBF after two months was 133 N when compared to the baseline and 50 N when compared to the 24-hour readings. Similar findings that there is an increase in bite force after implant crowns were seen in a study by Zou et al [21], which showed an increase of only 3-6% but was statistically significant when statistics were done. It was 3.31% for a unilateral single posterior implant and 6.83% for a bilateral restoration.…”

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

“…The sample size is calculated according to the experimental research method ( Zhou et al, 2021 ), and the analysis index is “the change of occlusal force distribution before and after free end implant restoration”, assuming that the data to be measured is occlusal force, if the standard deviation of the difference in occlusal force of the subjects in this study is For σ = 3 units, every 2 units of occlusal force increase after implant restoration was considered meaningful, α was 0.05, and the test efficiency 1-β was 0.90. The standard deviation of the bite force of the sample is s=(σ = )3 units, δ = 2 units of bite force change, α = 0.05, Zα/2 = 1.96, β = 0.10, Zβ = 1.282.…”

Oclusión bio-fisiológica protectora en prótesis implantosoportada

“…El esmalte de los dientes se desgasta o fisura ante problemas oclusales, mientras que los materiales que confeccionan las prótesis no sufren ningún cambio ante sobrecargas. Todo esto hace que el diente pueda adaptarse mejor ante situaciones anómalas, mientras que le implante no posee dichos mecanismos de adaptación (21).…”

“…Debido a las diferencias anatómicas y fisiológicas comentadas en los apartados anteriores entre dientes e implantes, se hace necesario la construcción de un sistema oclusal independiente para este tipo de prótesis parciales implantosoportadas, de modo que se les pueda dotar de mecanismos de defensa ante las anormalidades oclusales que puedan surgir (19) (21).…”

“…Esto se conoce como guía canina. Esta guía anterior y canina en las prótesis implantosoportadas debe adaptarse, ser poco marcada, con contactos ligeros, de forma que no sufran los implantes durante los movimientos excursivos (21). Si los dientes adyacentes están periodontales, o existen prótesis parciales implantosoportadas en sectores anteriores, se podría instaurar una función de grupo para no sobrecargar los dientes que intervienen en las guías anterior y canina (11)(23).…”