Dental and medical problems · 2026
Strain analysis in posterior implant-supported fixed dental prostheses - cemented compared to screwed: An in vitro study.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод в очереди
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Naishlos Sarit, Nissan Joseph, Shely Asaf, Ben-Izhack Gil, Chaushu Liat, Rosner Ofir
Аннотация
BACKGROUND: Research on the etiology of excessive strain at the implant neck, which may be associated with technical and biological complications, is still lacking.
OBJECTIVES: This in vitro study aimed to compare strain development at the implant neck between cementretained and screw-retained implant-supported fixed restorations, as well as among 3 prosthesis designs, using strain gauge analysis.
MATERIAL AND METHODS: Six prosthetic configurations were fabricated and divided according to their retention mechanism: single crowns - cement-retained and screw-retained (SC-c and SC-s, respectively); splinted restorations - cement-retained and screw-retained (SP-c and SP-s, respectively); and simple threeunit bridges - cement-retained and screw-retained (SB-c and SB-s, respectively). Two strain gauges were attached to the implant necks. A vertical load of 200 N was applied simultaneously at 3 identical loading points on each restoration. Strain measurements were analyzed statistically using ANOVA and Scheffé's post hoc contrast analysis.
RESULTS: Cement-retained restorations transferred significantly less cervical strain to the implant neck than screw-retained restorations in all 3 prosthetic configurations tested (p < 0.001; SC-c < SC-s; SP-c < SP-s; and SB-c < SB-s). Single crowns transferred significantly less strain to the implant neck than the other restoration designs in both cement-retained and screw-retained groups (p < 0.001; SC-c < SP-c and SB-c; SC-s < SP-s and SB-s).
CONCLUSIONS: The use of cement-retained implant-supported fixed prostheses results in less strain development at the implant neck when subjected to high occlusal loads as compared to screw-retained prostheses. Splinting the adjacent implant-supported restorations does not necessarily reduce strain at the implant neck.
OBJECTIVES: This in vitro study aimed to compare strain development at the implant neck between cementretained and screw-retained implant-supported fixed restorations, as well as among 3 prosthesis designs, using strain gauge analysis.
MATERIAL AND METHODS: Six prosthetic configurations were fabricated and divided according to their retention mechanism: single crowns - cement-retained and screw-retained (SC-c and SC-s, respectively); splinted restorations - cement-retained and screw-retained (SP-c and SP-s, respectively); and simple threeunit bridges - cement-retained and screw-retained (SB-c and SB-s, respectively). Two strain gauges were attached to the implant necks. A vertical load of 200 N was applied simultaneously at 3 identical loading points on each restoration. Strain measurements were analyzed statistically using ANOVA and Scheffé's post hoc contrast analysis.
RESULTS: Cement-retained restorations transferred significantly less cervical strain to the implant neck than screw-retained restorations in all 3 prosthetic configurations tested (p < 0.001; SC-c < SC-s; SP-c < SP-s; and SB-c < SB-s). Single crowns transferred significantly less strain to the implant neck than the other restoration designs in both cement-retained and screw-retained groups (p < 0.001; SC-c < SP-c and SB-c; SC-s < SP-s and SB-s).
CONCLUSIONS: The use of cement-retained implant-supported fixed prostheses results in less strain development at the implant neck when subjected to high occlusal loads as compared to screw-retained prostheses. Splinting the adjacent implant-supported restorations does not necessarily reduce strain at the implant neck.