Table 5.
Characteristics of the 74 restorations that were placed in cracked teeth that ultimately failed during follow-up
| # Failures | % of Total Failures | |||
|---|---|---|---|---|
|
|
||||
| Restoration Type | Intra-coronal | 47 | 64% | |
| Full Crown | 24 | 32% | ||
| Partial Crown | 3 | 4% | ||
| Type of placement | Direct | 49 | 66% | |
| Indirect | 25 | 34% | ||
| Bonded | Yes | 53 | 72% | |
| No | 21 | 28% | ||
| Build-up prior to placement | Yes | 12 | 16% | |
| No | 62 | 84% | ||
|
|
||||
| Material Type Used in the Restoration that was Followed Until Failure | % of 55 known materials | Average Time to Fail (months)* | ||
|
| ||||
| Composite | 23 | 40% | 19.8 | |
| Amalgam | 11 | 19% | 14.7 | |
| Glass ionomer | 3 | 5% | 17.0 | |
| Ceramic crown | 10 | 18% | 15.0 | |
| Metal crown | 5 | 9% | 14.6 | |
| PFM | 2 | 4% | - | |
| Other | 1 | 2% | - | |
|
| ||||
| Unknown | 22 | |||
*
Number months from restoration completion to failure (recommendation or placement of new restoration, root canal, fracture, extraction)