A cast dowel-core technique for multirooted teeth with divergent canals

Ziebert, Gerald J.; Johnson, Ralph M.

doi:10.1016/0022-3913(83)90502-4

Cited by 4 publications

(1 citation statement)

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“…Previous studies have shown relationships between root fracture and post and core materials, as well as between root fracture and ferrule status (presence or absence) [7] [8] [9]. Because resistance to wedge-like loads and torque transmitted through a post can be achieved by securing a ferrule [10], the application of an appropriate ferrule by orthodontic extrusion and surgical periodontal treatment is recommended for teeth without ferrules. Compared with vertical fracture, fracture and detachment of the post and tooth neck fracture occur more frequently in a glass fiber-reinforced post [11] [12]; therefore, the use of a glass fiber-reinforced post may reduce the risk of complications leading to extraction in teeth where posts are secured by ferrules.…”

Section: Introductionmentioning

confidence: 99%

Stress Distribution in Maxillary Central Incisors without Ferrules: A Finite Element Analysis of Post and Core Systems

Tagahara¹,

Masaki²,

Nodai³

et al. 2021

OJST

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Purpose: The purpose of this study was to identify optimal post and core materials for central incisors without ferrules using three-dimensional finite element analysis and three-point bending tests. Methods: Stress analyses were performed with six models: cast metal post and core (MP), composite resin core alone, straight fiber-reinforced post-composite resin core (FSR), tapered fiber-reinforced post-composite resin core, straight titanium postcomposite resin core (TSR), and tapered titanium post-composite resin core (TTR). A 100-N load was applied to the lingual surface at a 45˚ angle to the long axis of the tooth. Maximum von Mises stress distributions were calculated with finite element analysis software. Five samples each of composite resin, straight fiber-reinforced post, straight titanium post, straight fiberreinforced post and composite resin, and straight titanium post and composite resin were subjected to three-point bending tests, followed by analysis of variance and Tukey's multiple comparison test. Results: Stress distribution was optimal on TTR. Maximum von Mises stress on the cervical side of the post was greatest in TSR (693 MPa) and TTR (556 MPa). Maximum stress on the apical side of the post was greatest in MP (110 MPa). Maximum stress in surrounding dentin was lowest in MP (203 MPa) and TTR (250 MPa). Gap distance was smallest in MP (0.09 mm) and largest in FSR (0.26 mm). Mean maximum three-point bending force was lowest in composite resin (26.9 N/mm) and highest in titanium post and composite resin (97.1 N/mm). Titanium post bending strength was consistently greater than that of the fiber-reinforced post (p < 0.01). Conclusion: These results revealed optimal stress distribution and high bending strength with the tapered titanium post and resin combination, suggesting that this combination can most effectively prevent root or post fracture in an anterior tooth without a ferrule.

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Section: Introductionmentioning

confidence: 99%