Limits...
An In Vitro Study on the Effects of Post-Core Design and Ferrule on the Fracture Resistance of Endodontically Treated Maxillary Central Incisors.

Sreedevi S, Sanjeev R, Raghavan R, Abraham A, Rajamani T, Govind GK - J Int Oral Health (2015)

Bottom Line: The fracture load results were then statistically analyzed.Reinforcement of endodontically treated maxillary central incisors with post and core, improved their fracture resistance to be at par with that of endodontically treated maxillary central incisor, with natural crown. 2.The fracture resistance of endodontically treated maxillary central incisors is significantly increased when restored with custom cast post-core and 2 mm ferrule.

View Article: PubMed Central - PubMed

Affiliation: Professor, Department of Prosthodontics, Century International Institute of Dental Sciences and Research Centre, Poinachi, Thekkil, Kasaragode, Kerala, India.

ABSTRACT

Background: Endodontically treated teeth have significantly different physical and mechanical properties compared to vital teeth and are more prone to fracture. The study aims to compare the fracture resistance of endodontically treated teeth with and without post reinforcement, custom cast post-core and prefabricated post with glass ionomer core and to evaluate the ferrule effect on endodontically treated teeth restored with custom cast post-core.

Materials and methods: A total of 40 human maxillary central incisors with similar dimensions devoid of any root caries, restorations, previous endodontic treatment or cracks were selected from a collection of stored extracted teeth. An initial silicone index of each tooth was made. They were treated endodontically and divided into four groups of ten specimens each. Their apical seal was maintained with 4 mm of gutta-percha. Root canal preparation was done and then post core fabrication was done. The prepared specimens were subjected to load testing using a computer coordinated UTM. The fracture load results were then statistically analyzed. One-way ANOVA was followed by paired t-test.

Results: 1. Reinforcement of endodontically treated maxillary central incisors with post and core, improved their fracture resistance to be at par with that of endodontically treated maxillary central incisor, with natural crown. 2. The fracture resistance of endodontically treated maxillary central incisors is significantly increased when restored with custom cast post-core and 2 mm ferrule.

Conclusion: With 2 mm ferrule, teeth restored with custom cast post-core had a significantly higher fracture resistance than teeth restored with custom cast post-core or prefabricated post and glass ionomer core without ferrule.

No MeSH data available.


Related in: MedlinePlus

Average fracture strength of specimens.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4588787&req=5

Figure 3: Average fracture strength of specimens.

Mentions: This may be due to the lack of an accurate fit of the prefabricated post to the post space that hindered the transmission of occlusal stresses and led to root fracture at lower loads. When analyzing the fracture mode of each group, it can be noted that cervical and mid-root fracture occurred only in Group A (Table 6). In all other groups that were restored using posts, fracture occurred either at the coronal part of the endodontically treated teeth or at their apical third. This could be due to the lack of post reinforcement in the cervical and mid-root region in Group A. Placement of posts in all other groups, reinforced the tooth in the cervical and mid-root region and hence prevented root fracture in these regions. Vertical root fracture occurred only in Group C, that was restored with custom cast post-core without a ferrule. When a ferrule is absent, occlusal forces must be resisted exclusively by a post that may eventually fracture; otherwise root fracture may occur (Graph 1). Therefore, a conservative preparation design must be considered, and only the unsupported tooth structure should be removed to enhance the transmission of tensile and shear stresses to the coronal tooth structure and thereby reduce the possibility of root fracture.


An In Vitro Study on the Effects of Post-Core Design and Ferrule on the Fracture Resistance of Endodontically Treated Maxillary Central Incisors.

Sreedevi S, Sanjeev R, Raghavan R, Abraham A, Rajamani T, Govind GK - J Int Oral Health (2015)

Average fracture strength of specimens.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588787&req=5

Figure 3: Average fracture strength of specimens.
Mentions: This may be due to the lack of an accurate fit of the prefabricated post to the post space that hindered the transmission of occlusal stresses and led to root fracture at lower loads. When analyzing the fracture mode of each group, it can be noted that cervical and mid-root fracture occurred only in Group A (Table 6). In all other groups that were restored using posts, fracture occurred either at the coronal part of the endodontically treated teeth or at their apical third. This could be due to the lack of post reinforcement in the cervical and mid-root region in Group A. Placement of posts in all other groups, reinforced the tooth in the cervical and mid-root region and hence prevented root fracture in these regions. Vertical root fracture occurred only in Group C, that was restored with custom cast post-core without a ferrule. When a ferrule is absent, occlusal forces must be resisted exclusively by a post that may eventually fracture; otherwise root fracture may occur (Graph 1). Therefore, a conservative preparation design must be considered, and only the unsupported tooth structure should be removed to enhance the transmission of tensile and shear stresses to the coronal tooth structure and thereby reduce the possibility of root fracture.

Bottom Line: The fracture load results were then statistically analyzed.Reinforcement of endodontically treated maxillary central incisors with post and core, improved their fracture resistance to be at par with that of endodontically treated maxillary central incisor, with natural crown. 2.The fracture resistance of endodontically treated maxillary central incisors is significantly increased when restored with custom cast post-core and 2 mm ferrule.

View Article: PubMed Central - PubMed

Affiliation: Professor, Department of Prosthodontics, Century International Institute of Dental Sciences and Research Centre, Poinachi, Thekkil, Kasaragode, Kerala, India.

ABSTRACT

Background: Endodontically treated teeth have significantly different physical and mechanical properties compared to vital teeth and are more prone to fracture. The study aims to compare the fracture resistance of endodontically treated teeth with and without post reinforcement, custom cast post-core and prefabricated post with glass ionomer core and to evaluate the ferrule effect on endodontically treated teeth restored with custom cast post-core.

Materials and methods: A total of 40 human maxillary central incisors with similar dimensions devoid of any root caries, restorations, previous endodontic treatment or cracks were selected from a collection of stored extracted teeth. An initial silicone index of each tooth was made. They were treated endodontically and divided into four groups of ten specimens each. Their apical seal was maintained with 4 mm of gutta-percha. Root canal preparation was done and then post core fabrication was done. The prepared specimens were subjected to load testing using a computer coordinated UTM. The fracture load results were then statistically analyzed. One-way ANOVA was followed by paired t-test.

Results: 1. Reinforcement of endodontically treated maxillary central incisors with post and core, improved their fracture resistance to be at par with that of endodontically treated maxillary central incisor, with natural crown. 2. The fracture resistance of endodontically treated maxillary central incisors is significantly increased when restored with custom cast post-core and 2 mm ferrule.

Conclusion: With 2 mm ferrule, teeth restored with custom cast post-core had a significantly higher fracture resistance than teeth restored with custom cast post-core or prefabricated post and glass ionomer core without ferrule.

No MeSH data available.


Related in: MedlinePlus