Fracture Strength of Endodontically treated Maxillary Central Incisors restored with Nickel Chromium and Nonprecious Gold Alloy Casting Post and Cores

Khiavi, Hassan Azangoo; Habibzadeh, Sareh; Safaeian, Shima; Eftekhar, Mahsa

doi:10.5005/jp-journals-10024-2299

Cited by 2 publications

(3 citation statements)

References 53 publications

(95 reference statements)

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“…The present findings also corroborate the results of Bilgin et al [ 14 ] who demonstrated the highest fracture resistance values in posts fabricated by computer-aided design and manufacturing (CAD-/CAM) milling. In contrast to the outcomes of this study, several studies [ 37 – 39 ] demonstrated a significant superiority of NPG posts as compared to the Co-Cr or Ni-Cr posts for reinforcing the tooth structure. This discrepancy between the results of this study and those of previous authors may be related to the differences in the method of post construction, or the use of full-coverage metal crowns instead of cores for force application.…”

Section: Discussioncontrasting

confidence: 99%

“…e present findings also corroborate the results of Bilgin et al [14] who demonstrated the highest fracture resistance values in posts fabricated by computer-aided design and manufacturing (CAD-/CAM) milling. In contrast to the outcomes of this study, several studies [37][38][39] demonstrated a significant superiority of NPG posts as compared to the Co-Cr or Ni-Cr posts for reinforcing the tooth structure.…”

Section: Discussioncontrasting

confidence: 96%

“…This discrepancy between the results of this study and those of previous authors may be related to the differences in the method of post construction, or the use of full-coverage metal crowns instead of cores for force application. Furthermore, in some studies [ 37 – 39 ], the samples were embedded in a thin layer of silicone impression material or molten wax to provide space between the root and acrylic resin and thus partly mimic the response of periodontal ligament to natural loads, but this procedure was not performed in the present investigation.…”

Section: Discussionmentioning

confidence: 99%

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Fracture Resistance of Endodontically Treated Premolars Reconstructed by Traditional Casting and CAD-CAM Milling Post and Cores

Nodehi

Moraditalab

Shafiee³

et al. 2022

International Journal of Dentistry

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Purpose. Restoration of endodontically treated premolars has always been considered as a challenging procedure. This study compared the fracture strength and mode of failure of root canal treated premolars reconstructed with various post and core systems. Materials and Methods. Twenty healthy extracted premolars were selected and underwent root canal treatment and then randomly assigned into 4 groups (n = 5). The teeth in group 1 restored with amalgam, whereas others reconstructed with post and cores made by cobalt-chromium (Co-Cr) casting (group 2), nonprecious gold (NPG) casting (group 3), or computer-aided design (CAD) and computer-aided manufacturing (CAM) milling (group 4). The force at fracture was measured in a universal testing machine, and the failure mode was recorded as repairable or nonrepairable. Results. ANOVA revealed a significant difference in fracture resistance between groups ( P = 0.001 ). The control group displayed significantly lower strength than that of the CAD-CAM or CO-Cr groups ( P < 0.05 ). The CAD-CAM posts were also more resistant to fracture than the NPG group ( P < 0.05 ). The frequencies of repairable fracture in the control, Co-Cr, NPG, and CAD-CAM groups were 40%, 20%, 20%, and 60%, respectively. The chi-square test revealed no significant difference in the distribution of failure modes between groups ( P = 0.415 ). Conclusion. The teeth reconstructed with post and cores were more resistant to fracture than those restored with amalgam alone. CAD-CAM milling could be considered as the best system for reconstruction of endodontically treated teeth, as it provided the highest fracture strength with less risk of nonrepairable tooth fracture.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussioncontrasting

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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Fracture Resistance of Endodontically Treated Premolars Reconstructed by Traditional Casting and CAD-CAM Milling Post and Cores

Nodehi

Moraditalab

Shafiee³

et al. 2022

International Journal of Dentistry

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In Vitro Study Comparing Retention of Custom Post and Cores Fabricated Using Conventional, CAD/CAM Milling and 3D-Printing Techniques

et al. 2022

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This study aimed to evaluate the differences in the retention of custom-cast non-precious post and cores (CCNPPCs) (control group), custom-milled titanium post and cores (CMTPCs), custom-printed titanium post and cores (CPTPCs), and custom-milled zirconia post and cores (CMZPCs), and to evaluate their mode of failure. The tested null hypothesis was that there were no differences in the retention of the various custom post and cores tested. A total of 80 post-and-core patterns were made using pattern resin and were divided into four groups: Group 1—fabricated via conventional casting using a non-precious casting alloy; Group 2—fabricated using a computer-aided design/computer-aided manufacturing (CAD/CAM) subtractive technique using titanium; Group 3—fabricated using a CAD/CAM additive (3D printing) technique using titanium; and Group 4—fabricated using a CAD/CAM subtractive technique using zirconia. The post and cores were cemented with resin cement and a universal pull-out test was used to check the retention. The data were statistically analyzed using one-way ANOVA tests, post hoc tests, and Tukey’s adjustment for multiple comparisons. The pull-out test revealed higher retention values for CPTPCs and CMTPCs. When compared with CMZPCs, the conventional CCNPPCs revealed significantly better retention values (p < 0.05). Cohesive failure was observed in Groups 1, 2, and 4. However, Group 3 revealed a mixed type of failure. The CCNPPCs revealed clinically acceptable values, while the CPTPC and CMTPC groups revealed better overall values of retention and time to failure. The titanium alloy was assessed to be a promising choice for fabricating dental post-and-core restorations.

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Fracture Strength of Endodontically treated Maxillary Central Incisors restored with Nickel Chromium and Nonprecious Gold Alloy Casting Post and Cores

Abstract: Due to proper mechanical properties, NPG post and cores seem to be a suitable choice for restoration of severely damaged anterior teeth, provided that other properties are proven to be acceptable.

Cited by 2 publications

References 53 publications

Fracture Resistance of Endodontically Treated Premolars Reconstructed by Traditional Casting and CAD-CAM Milling Post and Cores

Fracture Resistance of Endodontically Treated Premolars Reconstructed by Traditional Casting and CAD-CAM Milling Post and Cores

In Vitro Study Comparing Retention of Custom Post and Cores Fabricated Using Conventional, CAD/CAM Milling and 3D-Printing Techniques

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