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  1. Home
  3. Resin Composite Depth Of Cure Through Transparent Matrix Materials Used For Injection Molding.
  1. Home
  3. Resin Composite Depth Of Cure Through Transparent Matrix Materials Used For Injection Molding.

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Resin Composite Depth of Cure Through Transparent Matrix Materials Used for Injection Molding.

N C Lawson1, Z Greene2, N Machado3

  • 1*Nathaniel C Lawson, DMD PhD, UAB School of Dentistry, Division of Biomaterials, Birmingham, AL, USA.

Operative Dentistry
|February 5, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Curing light transmittance through clear matrix materials significantly impacts resin composite depth of cure (DOC). Doubling the curing time can achieve a full cure with certain materials and thicknesses, compensating for reduced light transmission.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Accurate light curing is crucial for resin composite polymerization.
  • Clear matrix materials are used in dental procedures, but their effect on light transmission and cure depth is not fully understood.
  • Assessing the impact of different clear matrix materials and thicknesses on light curing efficiency is essential for clinical success.

Purpose of the Study:

  • To compare the curing light transmittance and depth of cure (DOC) of resin composite through various clear polyvinyl siloxane (PVS) impression and 3D printed matrix materials.
  • To evaluate the influence of different material thicknesses on light transmittance and DOC.
  • To determine the correlation between light irradiance transmittance and the percentage of total cure (%TC).

Main Methods:

  • Three clear PVS and two 3D-printed clear matrix materials were tested at thicknesses from 2 mm to 10 mm.
  • Light irradiance transmittance was measured using a radiometer.
  • Depth of cure (DOC) was assessed using flowable and conventional resin composites, cured for 10 or 20 seconds.
  • Percentage of total cure (%TC) was calculated relative to a control without matrix material.

Main Results:

  • A strong positive correlation was found between light irradiance transmittance and %TC for both 10-second and 20-second curing times (r=0.90 and r=0.89, respectively).
  • Increasing matrix material thickness significantly reduced light transmittance and %TC.
  • Doubling the curing time to 20 seconds resulted in a statistically similar depth of cure for several materials at specific thicknesses compared to the control.

Conclusions:

  • Reduced light irradiance through clear matrix materials diminishes the depth of cure (DOC) of resin composites.
  • Utilizing extended curing times (e.g., 20 seconds) can effectively compensate for light reduction through certain matrix materials and thicknesses, achieving a complete cure.
  • Material selection and thickness are critical factors influencing the efficacy of light curing through clear dental matrices.