Direct Esthetic Restorative Materials, Composite What does it mean ?

Direct Esthetic Restorative Materials
composite resin dental composite Types of Composite Composites and Cements. Lecture
Both silicate cement and acrylic resin (PMMA) are
Materials from History
For Direct Restorations

Composite What does it mean ?
Organic phase (matrix)
Inorganic dispersed phase (fillers)
Coupling phase
Organic Phase (Resin Matrix )

Monomer system
BIS-GMA or UDMA. (viscous monomers)
Silorane resins (in the most recent, minimal-shrink type)
Diluents
TEGDMA & HEMA
Function
Hold all ingredients in one mass
Able to polymerize (Responsible for material's setting )
Accept pigments (Responsible for material's color )
Responsible for the setting contraction
Dispersed Phase (Fillers )
1. Inorganic fillers
Classification based on filler size and loading
Properties of traditional Composites
Coupling Phase
Vinyl triethoxy silane ( vinyl silane)

γ-Methacryloxy propyl trimethoxy Silane

Mechanism of attachment
They are composed of bi-functional molecules

The silane group chemically bonds to the inorganic materials
Both the ethoxy and methoxy groups react with resin molecules of the matrix

Function
  The water uptake
  The solubility rate
  The crack propagation

- Quartz, glass, barium and lithium alumino-silicates, barium fluoride
- Zinc (Zn), Boron (B), zirconium (Zr) and yttrium (Y) ions are added to produce radioopacity
Bonding of fillers to resin matrix
Chemically-Cured Composite
Light-cured composite
Effect of classical curing techniques on composite properties
Working time
step by step restoration
UV stabilizers… (2-hydroxy-4- methoxy benzophenone) Provide color stability under electro-magnetic waves

Coloring agents (Pigments)…. To provide materials with different shades

Composite polymerization is retarded in presence of Eugenol and oxygen.

It is mandatory to incrementally insert the light-cured material
The chemically-cured materials is no longer be used clinically
Mechanical, Micro-mechanical and inter-penetration means help the
composite retain to the tooth structure
Direct applications of resin composites
Filling class III, IV, V and VI cavities in anterior teeth
Filling small and moderate Class I, II, V cavities in post. teeth Core build-up (strengthening of weakened teeth)
Diastma Closure Direct laminate veneer
Advantages

Esthetic.
Conservative cavity.
Low thermal conductivity.
Quite resistance to microleakage
No corrosion.
Strengthening of the remaining tooth st.
Disadvantages
Filling class III, IV, V and VI cavities in anterior teeth
What do you exactly know about
the modified types of composite restoratives ?
افضل انواع الحشوات التي تستخدم للاسنان الامامية القواطع و الخلفيه الطواحن من حيث الشكل و النوع و اللون و درجة البياض و التزامن و التناسق و السطوع و مقارنتها مع الاسنان الطبيعيه و جمالها و طريقه تحظير المواد المستخدمه لحشو الشن بصوره سهله جدا و مع الكفاءة المطلوبه و الجوده اكيد و طرف لسق الحشوه في بنية السن و الاحتفاظ بها لفتره طويله و المواد الكيميائية المصنعه
composite resin dental composite Types of Composite Composites and Cements
The best types of fillings that are used for front teeth, incisors and posterior mills in terms of shape, type, color, whiteness, synchronization, consistency, brightness and comparison with natural teeth and its beauty, and the method used to prohibit the materials used for filling the filling in a very easy way and with the required efficiency and quality
Sure and tip for filling the filling in the tooth structure and keep it for a long time and the manufactured chemicals
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