This study compared fracture resistance (FR), failure mode (FM), and pull-out retention in endodontically-treated teeth restored with computer-aided design-and-manufacturing polymer-infiltrated ceramic networks (PICN) to cast post-core. A total of 45 maxillary central incisors were selected, endodontically treated, and were prepared to receive the post-core restorations. The specimens were randomly divided into five groups (n = 9): CG: control (without post-core); NC1, NC2: cast nickel-chromium (Ni-Cr) post-core; and VE1, VE2: PICN post-core. Groups CG, NC1, and VE1 were subjected to the FR test, while Groups NC2 and VE2 were subjected to the pull-out retention test. FR were recorded, and FM were classified as favourable or non-favourable, while the degree of retention in the maximum force was recorded in Newton. A one-way ANOVA was used to assess the FR, and an independent T-test was used for retention of post-core. No significant mean differences of FR between Ni-Cr versus PICN group (p = 0.261). Non-favourable FM was recorded in all samples in the NC group, with 88.9% of the VE group showed favourable FM. No significant mean differences were recorded in retention between NC2 and VE2 (p>0.05). PICN post-core exhibited favourable FR, FM, and retention values, thus having the potential to be used as a substitute post-core in endodontically-treated anterior teeth.
Fracture Resistance, Failure Mode and Pull-Out Bond Strength of Polymer-Infiltrated Ceramic-Network Post-Core Fabricated using Computer-Aided Design/Computer-Aided Manufacturing
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Kajian ini membandingkan rintangan patah (FR), mod kegagalan (FM), dan ketahanan daya tarikan tiang pergigian dalam gigi yang dirawat secara endodontik yang direstorasi dengan rangkaian seramik tersusun polimer (PICN) yang direka bentuk dan dibuat dengan komputer dengan tiang pergigian keluli. Sejumlah 45 batang gigi kacip tengah atas dipilih, diberikan rawatan endodontik dan disediakan untuk menerima restorasi tiang dan teras pergigian. Spesimen dibahagikan secara rawak kepada 5 kumpulan (n = 9); CG: kawalan (tanpa tiang dan teras pergigian); NC1, NC2: tiang dan teras pergigian keluli nikel-kromium (Ni-Cr); dan VE1, VE2: tiang dan teras pergigian PICN. Kumpulan CG, NC1 dan VE1 dikenakan ujian FR, manakala kumpulan NC2 dan VE2 dikenakan ujian ketahanan daya tarikan. FR direkodkan, dan FM diklasifikasikan sebagai menggalakkan atau tidak menggalakkan, manakala tahap pengekalan dalam daya maksimum direkodkan dalam Newton. ANOVA sehala digunakan untuk menilai FR, dan ujian T bebas digunakan untuk pengekalan tiang dan teras. Tiada perbezaan min ketara FR antara kumpulan Ni-Cr berbanding kumpulan PICN (p = 0.261). FM yang tidak menggalakkan telah direkodkan dalam semua sampel dalam kumpulan NC, dengan 88.9% daripada kumpulan VE menunjukkan FM yang menggalakkan. Tiada perbezaan min yang ketara direkodkan dalam pengekalan antara NC2 dan VE2 (p>0.05). Tiang dan teras PICN mempamerkan nilai FR, FM, dan pengekalan yang menggalakkan, sekali gus berpotensi untuk digunakan sebagai tiang dan teras pengganti dalam gigi anterior yang dirawat secara endodontik.
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