Assessment of Fracture Resistance Capacity of Different Core Materials with Porcelain Fused to Metal Crown: An in vitro Study

Abstract

The aim of the study was to evaluate the capacity to resist fracture in different core buildup materials with porcelain fused to metal (PFM) crown. Totally, 45 mandibular single rooted first premolars were collected, which were sound along with similar shape and size. The teeth were sectioned at 15 mm above the root apex sparing the sound tooth structure. The teeth were endodontically treated with the crown-down technique using nickel-titanium (NiTi) instrumentation. The specimens were randomized into three groups as per the core materials used and were labeled accordingly. Group I consisted of dual-cured composite resin, group II consisted of glass ionomer reinforced with resin, and group III consisted of Miracle mix. Universal loading machine is used for measuring the compres-sive load applied to fracture the tooth. The mean value of compressive strength was maximum in the dual cured composite resin (598.42 ± 22.64) followed by glass ionomer reinforced with resin (478.88 ± 26.74) and Miracle mix (442.16 ± 30.10). The results showed a significant difference statistically within the core materials used with p < 0.05. The results from the Tukey's test of multiple comparisons between dual-cured composite resin glass ionomer reinforced with resin, dual-cured composite resin Miracle mix, and glass ionomer reinforced with resin Miracle mix showed a highly statistical difference with p < 0.05, which is significant. This study showed that the dual-cured composite resin had maximum resistance to fracture compared with other core buildup materials on teeth which were endodonti-cally treated. Restoration of a tooth which is structurally compromised is a tricky job for all the dentists. Restoring it with a proper core buildup material with adequate fracture resistance makes the tooth structure stable. The core material should be able to resist all types of occlusal forces and to distribute it equally within the tooth structure. Core buildup, Crowns, Endodontically treated teeth, Fracture resistance.

High Patient’s Acceptance of Maryland Bridge: A Minimal Procedure Following Dental Trauma

“…There has also been significant interest in the way they are bonded together. [24] For example, the adhesive resin cement (dual cure bonding system) was used for the cementation of Maryland bridge as it provided high adhesion, long-term stability or bond strength better than glass ionomer cement or zinc cement. [25], [26] This patient was then closely monitored and reviewed.…”

Application of Polyether Ketone in Oral Implantology and Prosthodontics

“…PEEK is yet another substance that may be used to replace PMMA in CAD-CAM restorations. It has been proposed that PEEK permanent prostheses created using CAD-CAM dentures are more fracture-tough than compacted sandy or bead PEEK dentures [ 38 , 39 ]. No scientific investigations, however, have been conducted to compare the abrasion produced by PEEK peaks on teeth to that generated by other components such as metals and ceramics.…”