Document Detail

Reduced polymerization stress through non-bonded nanofiller particles.
MedLine Citation:
PMID:  12164184     Owner:  NLM     Status:  MEDLINE    
The stress that results from the placement of dental composite in a confined setting compromises the integrity of the marginal seal. Dental composites which include nanofiller particles that are not treated with a functional agent to couple them to the resin matrix can result in lower stress levels. Three types of nanofillers were evaluated having either a functional silane coating, a non-functional silane coating. or no coating. These were added at five different vol% levels to a photo-sensitized mixture of three dimethacrylate monomers alone or at three different vol% levels to the same resin filled with mini-filler particles to a clinically realistic level. The stress generated by these materials when cured in a confined setting was measured in a mechanical testing machine. The effect of monomer molecular weight on the stress levels was evaluated by preparing three resin formulations with varied co-monomer levels and filling them with bonded or non-bonded nanofillers. Reductions in polymerization stress of up to 31% were achieved among both the nanofilled resins and the mini-filled composite. The materials which contained a heightened level of diluent monomer produced significantly higher stress levels (ANOVA/Tukey's test, p < 0.05). Significant reductions in polymerization stress can be achieved through minor alterations in composite chemistry.
John R Condon; Jack L Ferracane
Related Documents :
18505214 - Buonocore lecture. placing dental composites--a stressful experience.
7916894 - A three-dimensional finite element study on two versus four implants in an edentulous m...
7597104 - Experimentally determined microcracking around a circular hole in a flat plate of bone:...
20452854 - Influence of number and inclination angle of implants on stress distribution in mandibu...
24411994 - Properties of axially loaded implant-abutment assemblies using digital holographic inte...
8358634 - Ultrastructural changes of osteoclasts on hen medullary bone during the egg-laying cycle.
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biomaterials     Volume:  23     ISSN:  0142-9612     ISO Abbreviation:  Biomaterials     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-08-07     Completed Date:  2003-02-21     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8100316     Medline TA:  Biomaterials     Country:  England    
Other Details:
Languages:  eng     Pagination:  3807-15     Citation Subset:  IM    
Department of Biomaterials and Biomechanics, School of Dentistry, Oregon Health and Science University, Portland, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Analysis of Variance
Composite Resins / chemistry*
Compressive Strength
Dental Cements / chemistry*
Dental Stress Analysis / methods*
Materials Testing / methods*
Silanes / chemistry*
Stress, Mechanical
Time Factors
Grant Support
Reg. No./Substance:
0/Composite Resins; 0/Dental Cements; 0/Silanes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Low viscosity dimethacrylate comonomer compositions [Bis-GMA and CH3Bis-GMA] for novel dental compos...
Next Document:  The effect of transforming growth factor-beta1, released from a bioabsorbable self-reinforced polyla...