Effect of the Location of Dental Mini-Implants on Strain Distribution under Mandibular Kennedy Class I Implant-Retained Removable Partial Dentures

Abstract

Purpose. To investigate the effect of minidental implant location on strain distributions transmitted to tooth abutments and dental minidental implants under mandibular distal extension removable partial denture. Materials and Methods. A mandibular Kennedy Class I distal extension model missing teeth 35–37 and 45–47 was constructed. Six dental mini-implants were placed at positions A, B, and C, where position A was 6.5 mm distal to the abutment teeth with 5 mm between each position. Fourteen uniaxial strain gauges were bonded on the model at the region of dental mini-implant and abutment (first premolar). Four groups were designated according to the location of the mini-implants. A load of 150 N and 200 N was applied using an Instron testing machine. Loadings consisted of bilateral and unilateral loading. Comparisons of the mean microstrains among all strain gauges in all situations were analyzed. Results. Variation in mini-implant locations induced local strains in different areas. Strains at the tooth abutment were significantly decreased in the group in which implants were placed mesially. Strains around the mini-implants showed different patterns when loaded with different loading conditions. The group in which implants were placed distally showed the lowest strains compared to other groups. Conclusion. Mesially placed mini-implants showed the lowest strain around abutment teeth, while a distally-placed mini-implants presented the lowest strain around mini-implants themselves. Under favorable biting force, mini-implant is an option to assist mandibular distal extension removable partial denture. Mesially placed mini-implants are recommended when the abutment has periodontally compromised conditions and a distally placed mini-implant when periodontal conditions are stable.

Effect of Number and Location on Stress Distribution of Mini Dental Implant-Assisted Mandibular Kennedy Class I Removable Partial Denture: Three-Dimensional Finite Element Analysis

“…The thickness of artificial PDLs was 0.3 mm [ 32 ]. The conventional cobalt-chrome-molybdenum RPD framework, with lingual bar and rest-proximal plate-Akers (RPA) clasp engaged mesial undercut of both first premolar abutment teeth, was fabricated in the model [ 33 ].…”

“…Eight models of mini dental implant-assisted mandibular Kennedy class I bilateral distal extension RPD were generated by 6.13 ABAQUS program (ABAQUS 6.13, Simulia, Providence, RI, USA) with different numbers and locations of mini dental implants ( Figure 1 ). Mini dental implants were placed at second premolar, first molar, and second molar position distally from abutment tooth 6.5, 11.5, and 16.5 mm, respectively [ 33 ]. The measurement from a strain gauge model under the same conditions was utilized to validate the 3D FEA model at the surface area of FE model.…”

Stress Distribution Pattern in Mini Dental Implant-Assisted RPD with Different Clasp Designs: 3D Finite Element Analysis

“…Two identical chemical-cured resin acrylic mandibular models with preformed resin teeth (PE-ANA002 ® ; Nissin, Kyoto, Japan) from 34 to 44 and bilateral distal extension edentulous ridges were fabricated. For the model assigned for FEA model fabrication, the polyvinyl siloxane (GI Mask Automix, Coltene, Madrid, Spain) was used to simulate the 2 mm gingival mucosa covered on edentulous ridges with an average of 0.3 mm periodontal ligament surrounded on the root surface of abutment teeth as described by a previous study (Figure 1(a)) [22]. e second model was prepared as a master model for framework fabrication.…”

“…To overcome this problem, the dental implant with smaller diameter called mini dental implants (MDIs) has been developed and applied. e success of using MDIs to gain the stability and retention of overdentures in patients who had compromised supporting bone has been addressed in previous studies [19][20][21][22][23]. However, Holmgren [24] found that the decrease in the bone-implant interface in case of MDIs resulted in higher and wider stress distribution in the peri-implant bone.…”

PEEK Biomaterial in Long-Term Provisional Implant Restorations: A Review

“…Currently, digital technologies have been integrated into implant dentistry for prosthetic restoration rehabilitation of missing teeth [ 1 , 2 , 3 , 4 ]. For implant components, titanium (Ti) and its alloys are commonly used but they have disadvantages of causing black coloration in the anterior zone and causing allergy [ 5 , 6 ].…”