Proximal contact formation with different restorative materials and techniques.
OBJECTIVE
To determine, whether different tooth colored materials and application techniques influence the proximal contact strengths (PCS) in vitro.


METHODS
Standardized MO-cavities for direct restorations were prepared into 360 artificial lower first molars. Eight groups were formed (n = 45) and restored with amalgam (1), low (2, 3), medium (4, 5) and high (6, 7) viscosity hybrid composites and compared to the original contact strengths of the unprepared teeth (8). The restored teeth were mounted into a socket simulating physiological tooth mobility. PCS were quantified by measuring the forces necessary for passing the proximal contact with floss under standardized conditions using a universal testing machine.


RESULTS
PCS ranged from 1.32 +/- 0.56 N for the low viscosity composite to 9.90 +/- 1.98 N for the Amalgam restoration. Medium (5.65 +/- 1.08 N) and high viscosity hybrid composites (5.90 +/- 1.45 N) inserted in a multi-layer technique showed no statistically significant differences to the original PCS of the unprepared teeth (5.76 +/- 0.53 N).
Klein
Filip
F
Department of Restorative Dentistry, School of Dental Medicine, Ruprecht-Karls-University, Heidelberg, Germany.
Keller
Agnes K
AK
Staehle
Hans Jörg
HJ
Dörfer
Christof E
CE
D000704:Analysis of Variance; D003188:Composite Resins; D003723:Dental Amalgam; D003742:Dental Devices, Home Care; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D003970:Diastema / Q000517:prevention & control*; D005502:Food; D006801:Humans; D008422:Materials Testing; D008434:Matrix Bands; D008963:Molar; D018709:Statistics, Nonparametric; D014783:Viscosity
D003188:Composite Resins; C113049:Solitaire composite resin; C121818:Tetric ceram; C452226:tetric flow composite resin; D003723:Dental Amalgam