Mechanical behaviour and structure of light-cured special tray materials

Devlin, Hugh; Cash, A.J.; Watts, D.C.

doi:10.1016/0300-5712(95)91191-o

Cited by 16 publications

(10 citation statements)

References 4 publications

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“…Maximum creep strains were in the range of 2.04–7.69% and 1.03–6.89% for group I and group II, respectively. Overall, they showed greater creep strain behaviour than non‐flowable composites reported in other studies under higher applied stress and longer testing periods (2, 10, 11). With respect to differences in the conditions of this study compared with those of other studies, the results indicated that flowable resin composites still exhibited a creep resistance inferior to that of non‐flowable resin composites.…”

Section: Discussionmentioning

confidence: 56%

“…This is because an indeterminate non‐linear stress distribution arises within the flexural bar or plate. Such complications like these do not occur in compressive creep measurements and so the strain and recovery of the material may be determined for an accurately known applied stress (10).…”

Section: Discussionmentioning

confidence: 99%

“…The magnitude of the visco‐elastic deformation is dependent upon several factors, including stress level, temperature, and moisture (4, 10–12). Furthermore, the visco‐elastic creep of resin composites is highly dependent on the nature, distribution, and size of the inorganic filler particles (1, 4).…”

mentioning

confidence: 99%

“…Increases in filler content reduce creep strain. Creep is also dependent upon the composition of the resin phase, particularly the degree of monomer conversion (DC) (10). Creep strain is much greater in unfilled resins (13) or in lightly filled resin composites (4) than in highly filled resin composites because of the greater volume fraction of polymer matrix (8).…”

mentioning

confidence: 99%

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Time‐dependent visco‐elastic creep and recovery of flowable composites

Baroudi

Silikas

Watts

2007

European J Oral Sciences

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Creep behaviour of flowable composites was evaluated in relation to their filler fraction and the postcure period. Solid cylindrical specimens were prepared (4 x 6 mm) using steel moulds, with thorough light curing from multiple directions at 600 mW cm(-2). The specimens were divided into two groups (n=3/material) as follows: group I, loaded 5 min after preparation; and group II, loaded after storage for 1 month in water at 37+/-1 degrees C. A constant compressive stress of 36 MPa was applied to each specimen for 2 h followed by removal of the weight for 2 h of strain recovery. Axial strain measurements were obtained continuously over the total analysis time of 4 h. The maximum creep strain ranged from 2.04 to 7.69% and from 1.03 to 6.12% for groups I and II, respectively. Flowables that had the highest percentage of filler produced the lowest creep strain. The creep response decreased with 1 month of preload storage. Clinically, the finding of this study suggests that flowable composites are unsuitable for stress-bearing areas.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Time‐dependent visco‐elastic creep and recovery of flowable composites

Baroudi

Silikas

Watts

2007

European J Oral Sciences

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“…6 Trays made from this material have sufficient rigidity to be used in fairly thin section, and have excellent dimensional stability; they may also be immersed in the commonly used disinfectant solutions, for example 1,000 ppm sodium hypochlorite, without any significant changes in their physical or mechanical properties. They are quick and easy to fabricate, although the blanks of uncured material are relatively expensive compared with the other materials.…”

Section: Tray Materialsmentioning

confidence: 99%