Impact of type and position of abutment connection on microstrain distribution:an in vitro study
10.4047/jap.2024.16.5.290
- Author:
Jekita SIRIPRU
1
;
Usanee PUENGPAIBOON
;
Chamaiporn SUKJAMSRI
;
Basel MAHARDAWI
;
Napapa AIMJIRAKUL
Author Information
1. Department of Conservative Dentistry and Prosthodontics, Srinakharinwirot University, Bangkok, Thailand
- From:The Journal of Advanced Prosthodontics
2024;16(5):290-301
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE:The aim of this study was to investigate microstrains around two non-parallel implant-supported prostheses and different abutment connections and positions under vertical static load using strain gauges.
MATERIALS AND METHODS:4 models simulating the mandibular unilateral free-end were fabricated. 8 implants (4.0 × 10 mm and 5.0 × 10 mm) were inserted in the second premolar, perpendicular to the occlusal plane, and the second molar, tilted at 15°. Four groups were analyzed: engaging and angled abutments (control group), both non-engaging abutments, both screw-and cement-retained prosthesis (SCRP) abutments, and engaging and non-engaging abutments. Strain gauges were placed buccally, lingually, mesially, and distally adjacent to each implant. The restoration was cement-retained in the control group and screw and cement-retained in the rest. Zirconia bridges were fixed on the abutment with NX3, and a 300 N vertical static load was applied. Microstrains were recorded and analyzed.
RESULTS:Both non-engaging abutments showed the highest compressive microstrains (-52.975), followed by engaging, angled abutment (-25.239). SCRP-SCRP abutments had the lowest compressive microstrains (-14.505), while the engaging, non-engaging abutments showed tensile microstrains (0.418). Microstrains in SCRP-SCRP and engaging, non-engaging groups were significantly lower than in the control group (α = .05). Premolar areas showed compressive microstrains (-47.06), while molar sites had tensile microstrains (+0.91), with microstrains in premolars being significantly higher than in molar area (α = .05).
CONCLUSION:The types of abutment connections and positions may have a potential effect on microstrains at the implant-bone interface. SCRP-SCRP abutments could be an alternative to use in non-parallel implant-supported prostheses when two implants make an angle of no more than 20 degrees.
