This review evaluating the presence or absence of a ferrule influences the failure rate in fibre-reinforced composite (FRC) post-and-core restorations included 4 studies. While the findings indicate no differences in failure rates between restoration with and with out a ferrule the quality of the evidence is low.
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This review of survival and technical complication rates of all-ceramic implant-supported single crowns included 41 mainly observational studies suggesting high survival rates for all-ceramic implant supported single crowns.
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This review to assess if surgical crown lengthening produces stable clinical outcomes only identified 5 small trials all at high risk of bias
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Only 9 small RCTs were included in this Cochrane review of metal-free materials for prosthodontic restorations providing insufficient evidence to support or refute the effectiveness of metal-free materials for fixed prosthodontic treatment over metal-ceramic or other type of standard restorations.
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This review of post-retained crowns on endodontically treated teeth included 9 RCTs. Findings suggest that that the number of remaining coronal walls and the use of posts are key factors for the success/ survival of these restorations. However the quality of the available evidence is low.
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5 studies at high risk of bias were included in this review of the success of restoration in posterior root filled teeth findings suggest that the more tooth remaining teh better the treatment outcome.
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This review of the effect of endodontic access on fracture resistance of all-ceramic crowns included 8 in-vitro studies providing some indication of potential factors that may impact on fracture resistance.
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This review of failure rate of single-unit prostheses versus direct restorations in vital posterior teeth included 14 studies (5 RCTs) finding that composite had a significantly higher failure rate than amalgams, regardless of the remaining tooth structure. For teeth with fewer than 2 remaining walls, direct restorations presented significantly higher failure rates than crowns .
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Only 7 small studies at high risk of bias were available for this review of preformed paediatric aesthetic crowns. They provide little evidence on which to r change of practice particular for posterior teeth where the use of stainless steel crowns is recommended.
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This review of the failure rates of all-ceramic crowns included 14 (9 prospective, 5 retrospective) studies. Using a broad definition of failure there was little difference between rates in anterior and posterior crowns.
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