In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations

Tan, Philip Leong Biow; Aquilino, Steven A.; Gratton, David G.; Stanford, Clark M.; Tan, Swee Chian; Johnson, William T.; Dawson, Deborah V.

doi:10.1016/j.prosdent.2005.01.013

Cited by 163 publications

(160 citation statements)

References 26 publications

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“…It has been reported that when the ferrule effect is present, stresses are redistributed in the outer surface regions of the coronal third of the root, thus a possible fracture in this area can be repairable. When the ferrule is absent, occlusal forces must be supported by a post that may [10,35,45]. In the present study, each tooth was prepared with a severe loss of coronal tooth structure preserving 2 mm of ferrule effect; the area of load application has also been widely described as one of the paramount factors to achieve reliable laboratory results [33,46,47].…”

Section: Discussionmentioning

confidence: 98%

“…However, a post with a high elastic modulus could be more prone to cause unrestorable fractures. This is why the use of posts with lower elastic modulus such as glass fiber ones have been proposed by several authors [34][35][36]. The advantage of glass fiber posts is that they are able to improve the bending resistance and that failures, if they occur, are more easily restorable.…”

Section: Discussionmentioning

confidence: 99%

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Adhesive restoration of anterior endodontically treated teeth: influence of post length on fracture strength

et al. 2013

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Objectives This study aims to evaluate the fracture resistance of endodontically treated anterior teeth restored with crowns made of composite or ceramic and retained without the use of a post (endocrowns) or with posts of 5 mm (short) and 10 mm in length (long). Material and methods Forty-eight intact maxillary incisors were selected for the study. After endodontic treatment, the crowns were sectioned 2 mm coronally to the cementoenamel junction provided with a ferrule of 2 mm. The roots were randomly divided into six groups (n=8) according to the post length and type of coronary restoration. The crowns were fabricated with the chairside economical restoration of esthetic ceramics system. Group 1 was restored with a 10-mm glass fiber post, composite core, and a full-coverage ceramic crown (LPCer); group 2, with a 5-mm glass fiber post, composite core, and a full-coverage ceramic crown (SPCer); group 3, with a 10-mm glass fiber post, composite core, and a fullcoverage composite crown (LPCpr); group 4, with a 5-mm glass fiber post, composite core, and a full-coverage composite crown (SPCpr); and groups 5 (EndoCer) and 6 (EndoCpr) were restored with ceramic and composite endocrowns, respectively. The teeth were then thermomechanically loaded in a chewing machine. After fatigue, the specimens were loaded to fracture. Data were analyzed with ANOVA and chi-square test. Mode of failure was defined as repairable or non-repairable. Results Presence of post, post length, and crown material had no significant effect on the fracture resistance. Groups restored with endocrowns presented a higher number of repairable fractures in respect to the other groups. Conclusions Presence of a post had no effect on the restorations' fracture strength. Clinical relevance Although this in vitro study has some limitations in respect to its clinical relevance, the restoration of largely destroyed anterior teeth with the use of an endocrown or a short glass fiber post might have advantages over a large glass fiber post.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Adhesive restoration of anterior endodontically treated teeth: influence of post length on fracture strength

et al. 2013

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“…However, placement of the dowels in the root canals will not improve the strength of the remaining tooth structure. [1][2] In one study, teeth with a metal dowel length equal to or greater than the clinical crown height had a success rate of 97%. 3 However, there also are reports of cast metal alloy dowel-cores having an inordinately high failure rate, 4 which is twice the frequency of prefabricated metal dowels.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Ferrule and Increased Clinical Crown Length on the In Vitro Fracture Resistance of Premolars Restored Using Two Dowel-and-Core Systems

Meng¹,

Ym²,

Guang³

et al. 2007

Operative Dentistry

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©Operative Dentistry, 2007, 32-6, 595-601 SUMMARYThis study investigated the effect of a crownlengthening ferrule on the fracture resistance of endodontically-treated teeth restored with two dowel-core systems.Thirty-two extracted mandibular first premolars were sectioned perpendicular to the long axis at a point 1.0 mm occlusal to the buccal cementoenamel junction. Following endodontic treatment, the teeth were randomly assigned to four groups: cast Ni-Cr alloy dowel-core with no ferrule (Group A1), cast Ni-Cr alloy dowel-core with 2.0 mm ferrule (Group A2), prefabricated carbon fiber-reinforced dowel-resin core with no ferrule (Group B1) and carbon fiber-reinforced dowel-resin core with 2.0 mm ferrule (Group B2). Each specimen was embedded in a self-cured acrylic resin block from 2.0 mm apical to the margins of a cast Ni-Cr alloy crown, then loaded at 150° from the long axis in a universal testing machine at a crosshead speed of 1.0 mm/minute until fracture. The data were recorded and analyzed using ANOVA and Fisher's exact tests, with α=0.05. Clinical RelevanceCrown lengthening with a 2.0 mm apical extended ferrule preparation may result in reduced root fracture strengths for endodontically-treated teeth. A carbon fiber-reinforced dowel-resin core system may reduce the severity of the root fractures. Crown lengthening with a 2.0 mm apical extended ferrule resulted in reduced fracture strengths for endodontically-treated teeth restored using two dowel-core systems and cast metal crowns. The carbon fiber-reinforced dowel-resin core system reduced the severity of the root fractures. INTRODUCTIONSubstantial coronal tooth destruction will usually require a dowel-core for intracanal retention of the restoration and distributing loading stresses to the remaining tooth structure. However, placement of the dowels in the root canals will not improve the strength of the remaining tooth structure.

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“…[41][42][43] However, the concept of partial ferrule should not be ruled out. The literature suggests that a non-uniform ferrule is still superior to no ferrule at all.…”

Section: C) Number Of Walls and Ferrule Locationmentioning

confidence: 99%

Rethinking ferrule – a new approach to an old dilemma

Jotkowitz

Samet

2010

Br Dent J

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In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations

Cited by 163 publications

References 26 publications

Adhesive restoration of anterior endodontically treated teeth: influence of post length on fracture strength

Adhesive restoration of anterior endodontically treated teeth: influence of post length on fracture strength

Effect of a Ferrule and Increased Clinical Crown Length on the In Vitro Fracture Resistance of Premolars Restored Using Two Dowel-and-Core Systems

Rethinking ferrule – a new approach to an old dilemma

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