ArticleBMC oral health2026
Stress distribution in angulated bendable one-piece and two-piece implant-supported single crowns in the posterior maxilla: a finite element analysis.
Article in BMC oral health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThis finite element analysis compared stress distribution and displacement in the implant-crown complex and peri-implant bone between angulated bendable one-piece and two-piece implants supporting posterior maxillary single crowns under standardized modeling conditions.
methodsA three-dimensional finite element model of a maxillary first molar single crown in Misch bone density category 3 was generated. Two base models representing a bendable one-piece implant and a two-piece angulated implant system (15°, 4.1 × 11.5 mm) were each evaluated with 2 crown materials (monolithic zirconia and lithium disilicate) and a 0.05-mm cement layer. The bendable one-piece implant was analyzed in its final post-adjustment geometry. All component interfaces were defined as idealized bonded contacts, and a 100-N oblique load at 30° was applied to the occlusal surface in a linear static analysis.
resultsImplant von Mises stresses were markedly higher in the bendable one-piece models (518-529 MPa) than in the two-piece angulated models (109-112 MPa), representing an approximately 4.7-times-higher stress level. Cement-layer stresses ranged from 22 to 29 MPa and were higher in the two-piece configurations. Crown displacement was approximately two times higher in the two-piece configurations (0.036-0.037 mm) than in the one-piece configurations (0.018 mm). Peri-implant bone principal stresses were also higher in the one-piece models, whereas differences between zirconia and lithium disilicate crowns were modest.
conclusionsWithin the limitations of this finite element analysis, the two-piece angulated configuration was associated with lower implant and peri-implant bone stresses than the bendable one-piece configuration, although it showed higher cement-layer stress and crown displacement. These results represent comparative behavior within an idealized model.
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