In vitro comparison of cuspal fracture resistances of posterior teeth restored with various adhesive restorations.
OBJECTIVE
This study compared the cuspal fracture resistances of posterior teeth restored with five different adhesive restorations.


METHODS
Eighty-four sound human molars were included in this study. Sample molars were divided into seven groups. The first five groups received mesio-occlusodistal cavity preparations and were restored with (1) amalgam combined with urethane dimethacrylate cement, (2) posterior composite, (3) direct composite inlay, (4) cast-metal inlay, and (5) complete ceramic inlay. The sixth and seventh groups were introduced in the study as controls. Samples of group 6 were prepared but were tested without restoration (prepared-only group). Samples of group 7 were intact teeth and were tested as unprepared. All samples were loaded axially until failure.


RESULTS
While the unprepared teeth had a significantly higher resistance than all other groups, the prepared-only teeth were the weakest. No significant differences were found in resistance to cuspal fracture among the restoration groups.


CONCLUSIONS
The difference between the mean cuspal fracture resistance of the unprepared and prepared-only groups was statistically significant. Restoration groups were stronger than the prepared-only group. However, differences between the restoration groups were insignificant.
Cötert
H S
HS
Ege University School of Dentistry, Department of Prosthodontics, Izmir, Turkey. cotert@hotmail.com
Sen
B H
BH
Balkan
M
M
D000328:Adult; D000704:Analysis of Variance; D003188:Composite Resins; D019245:Compressive Strength; D003722:Dental Alloys; D003723:Dental Amalgam; D003776:Dental Porcelain; D003793:Dental Restoration, Permanent / Q000009:adverse effects* / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D007284:Inlays; D008875:Middle Aged; D008963:Molar / Q000293:injuries / Q000502:physiology; D011897:Random Allocation; D019279:Resin Cements; D018709:Statistics, Nonparametric; D019228:Tooth Crown / Q000293:injuries*; D014082:Tooth Fractures / Q000209:etiology*
D003188:Composite Resins; D003722:Dental Alloys; D019279:Resin Cements; D003776:Dental Porcelain; D003723:Dental Amalgam