Relationship of Margin Design for Fiber-Reinforced Composite Crowns to Compressive Fracture Resistance

Abstract

Marginal fit of fiber-reinforced crowns was adversely affected by tooth-preparation design. The marginal gaps were greater for the shoulder margin specimens than in the light or deep chamfer margin specimens; however, the fracture strength of the chamfer margin specimens was greater than that of the shoulder margin specimens.

Scanning electron microscopy assessment of the load-bearing capacity of cad/cam-fabricated molar crowns

“…The results of this study supported our hypothesis that load-bearing capacity is significantly higher for FRC blocks than for composite resin and ceramic blocks. A previous study determined that dental restorations in the molar area should withstand a weight of ≤ 500 N, with a likely additional load of ≤ 200 N. 20 Another study indicated that FRC crowns could bear loads of > 1,000 N. 21 In the present study, the load-bearing capacity of our FRC and composite crowns was significantly higher than that reported in most previous studies. [22][23][24] This high fracture strength appears to be sufficient for withstanding the occlusal force applied by natural dentition.…”

“…[22][23][24] This high fracture strength appears to be sufficient for withstanding the occlusal force applied by natural dentition. 21 The cumulative success rate of FRC molar crowns after 36 months was estimated at 82%. 25 In another clinical study, FRC and ceramic restorations showed similar survival rates over a 4-year follow-up period.…”

Comparison of marginal and internal adaptation of three‐unit fixed dental prostheses made using CAD/CAM metal‐free materials

“…There are limited studies in the literature investigating FRC FDPs in terms of marginal and internal adaptation. Maghrabi et al [26] found the mean marginal gap values of single crowns fabricated from FRC material to be 69.7 ± 7.4 μm. This is similar to the mean marginal gap value obtained for the FRC group (70.85 ± 7.14 μm) in our study.…”

“…The marginal gap values of three‐unit FDPs fabricated from PEEK were found to be outside of the clinically acceptable range in only one study [24]. In contrast to that study, marginal and internal gap values were found to be within the clinically acceptable limits for single crowns fabricated from high‐performance polymers in several other studies [25–27]. To the best of our knowledge, there are no studies in the literature comparing the marginal and internal adaptation of three‐unit FDPs fabricated from third‐generation cubic zirconia and high‐performance polymers.…”

Effects of Nanofillers on Mechanical Properties of Fiber-Reinforced Composites Polymerized with Light-Curing and Additional Postcuring

“…The matrix is a light-cured thermoset bisGMA, which allows superior bonding, since it is identical to adhesives that are commonly used in dentistry (9). Embedding glass fibers into resin composite to reinforce the material properties has been reported to be indicated for several clinical applications such as periodontal tooth splinting, replacement of missing teeth, Maryland bridge, complete denture repair, overdenture components, direct construction of posts and cores (10-11-12-13-14-15). Mechanical (10-11-12-13) and clinical efficacy (14, 15) of FRCs has been extensively tested.…”