5. An emergent science formed from the convergence of
chemistry (classically restricted to atomic
interaction) and molecular scale physics and biology
(previously restricted to the micron scale)
Dental update Jan-Feb 2003
30. Glass-ionomer Liners
• Improve marginal integrity and decrease marginal
leakage (J Dent 1993;21:158-162)
Reduce polymerization shrinkage and cuspal
deformation(Quintessence Int 1988;19:191-1980
• How should composite be layered to reduce
shrinkage stress: Incremental or bulk filling?
. (Dental Materials 2008 ; 24 :1501 – 1505)
31. Glass ionomer liners
• SEM and microleakage evaluation of the
marginal integrity of two types of class V
restorations with or without the use of a
light-curable coating
• J Dent. 2008 Nov;36(11):885-91. Epub 2008
Aug 30 material and of polishing.
32. Dental Composites are much stronger
than the liners and bases and are
equally insulating
JADA 1994;125:687-701
Investigation of the electrical
properties of some dental
composite restorative materials
before and after laser exposure
Dental materials 2005 ;vol 22 : 885
- 895
33. Use of glass ionomer liner on
dentine cavity surfaces has shown
to significantly reduce
postoperative sensitivity
Am J Dent 2001;14:34-38
38. Techniques to make tight contacts
• Use of thin sectional matrices
• Prewedging
• Prepolymerized composite balls
• Special wedge shaped composite curing tips.
39.
40.
41.
42.
43. Do you need to use flowable composite
under posterior composite restorations?
60. • Shrinkage results in interfacial stresses, with the
potential for debonding and/or local fracture of
tissue or restorative.
• Shrinkage should be minimised as far as possible.
Shrinkage
61. Light-cure each increment
(4 mm)
Picture DFU
* 10 sec for light output ≥ 800 mW/cm2,
20 sec for light output of 500 to 800 mW/cm2.
67. Wear Resistance
• Clinical Relevance: A low wear rate means that
enamel-restorative margins and contact points
remain at the correct level, and that gross loss of
material does not occur. It goes without saying that a
low wear rate is a prerequisite for a modern
composite.
68. Flexural Strength and Modulus
Clinical Relevance: The flexural strength of a
dental material is an important property since
materials may be used in thin layers or in
poorly supported edges where flexural forces
occur.
A high flexural strength is therefore needed.