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Otturazioni dirette in composito e megariempitivi sferici: studio sulla microinfiltrazione in vitro.
... The SGMF is introduced into the composite restoration, prior to its polymerization, in order to decrease the amount of resin matrix used and consequently also reducing the contraction, that the restoration undergoes during the polymerization. Previous works have demonstrated both in vivo and in vitro the effectiveness of this new restorative technique (18)(19)(20)(21)(22). The SGMF thanks to its spherical shape does not affect the flow ability of the composite during the setting reaction, while minimizing the development of interfacial stress, since the sphere shape, compared with other solid shapes, has the lower sur-face extension. ...
... As already described in previous papers, the use of SGMFs gives several advantages: significantly they contribute to the reduction of the adhesive interface solicitation; help to improve the marginal seal in interproximal cavities with cervical margins on the root cementum, facilitate the light diffusion in the context of the filling material; allow to carry out a bulk polymerization; shift to a more coronal level, the shrinkage stress facilitating its dissipation by the cuspal compliance (18)(19)(20)(21)(22). This is relevant since sometime lost teeth can be cause of legal quarrel (23, 24) since they can be replaced with dental implant or orthodontic treatment (78)(79)(80)(81)(82)(83)(84). ...
Purpose. The Authors analyzed the effect of spherical glass mega fillers (SGMF) on reducing contraction stress in dental composite resins, by means of a cavity model simulating the cuspal deflection which occurs on filled tooth cavity walls in clinical condition.
Materials and methods. 20 stylized MOD cavities (C-factor = 0.83) were performed in acrylic resin. The inner surface of each cavity was sand blasted and adhesively treated in order to ensure a valid bond with the composite resin. Three different diameter of SGMF were used (i.e. 1, 1,5, 2 mm). The samples were divided in 4 groups of 5 each: Group 1 samples filled with the composite only; Group 2 samples filled with composite added with SGMFs, Ø1mm (16 spheres for each sample); Group 3 samples filled with composite added with SGMFs, Ø1,5 mm (5 spheres for each sample); Group 4 samples filled with composite added with SGMFs, Ø2 mm (2 spheres for each sample). Digital pictures were taken, in standardized settings, before and immediately after the polymerization of the composite material, placed into the cavities. With a digital image analysis software the distances from the coronal reference points of the cavity walls were measured. Then the difference between the first and second measurement was calculated. The data were analyzed by means of the ANOVA
test.
Results. A significative reduction on cavity walls deflection, when the composite resin is used in addiction with the SGMFs was observed. The SGMFs of smallest diameter (1mm) showed the better outcome.
Conclusion. The SGMFs are reliable in reducing contraction stress in dental composite resins.
... However, sometimes cavity design does not allow the polymerization within this distance (5,17). In previous studies the use of spherical glass mega fillers (SGMFs) was proposed in order to reduce the shrinkage of composite resin in direct restorations (18)(19)(20)(21)(22)(23). By means of both clinical evidences and in vitro experiments it has been possible to observe that SGMFs enabled the bulk polymerization, of the composite, in particular in the deep proximal boxes of Black class II cavities. ...
... SGMFs are introduced into the mass of the composite prior to its polymerization in order to reduce the amount of resinous matrix, thus reducing the polymerization shrinkage. Furthermore SGMFs significantly contribute to the reduction of the adhesive interface solicitation; help to improve the marginal seal in interproximal cavities with cervical margins on the root cementum; facilitate the light diffusion in the context of the filling material; allow to carry out a bulk polymerization; shift to a more coronal level, the shrink-age stress facilitating its dissipation by the cuspal compliance (18)(19)(20)(21)(22)(23). This is relevant since sometime lost teeth can be cause of legal quarrel (24,25) since they can substitute with dental implant or orthodontic treatment (77)(78)(79)(80)(81)(82)(83). ...
Purpose. Evaluate how the spherical glass mega fillers (SGMFs) can positively interfere with light diffusion when incorporated
in a composite restoration.
Materials and methods. 30 samples (Ss) were performed, applying 2 composite layers of 3 mm each: 6 were made with
composite only; 6 with a layer of SGMFs of Ø1.5mm within the first layer of composite; 6 with 2 overlapping layers of SGMFs
of Ø1.5mm; 6 with a layer of SGMFs of Ø2mm; 6 with 2 overlapping layers of SGMFs of Ø2mm. The curing time was set
at 40s for the first layer, and 120s for the second layer, transilluminated through the first layer. Digital pictures were taken,
in standardized settings, during the transillumination, and the light intensity was measured with a digital image analysis
software.
Results. From a lateral view the Ss with a single layer of SGMFs of Ø1.5mm and Ø2mm, the relative increments of light
intensity, were of 24.37% and 33.33% respectively. Concerning the Ss made with 2 layers of SGMFs, the relative increments
were of 67.99% and 66.4% respectively. In front view has emerged a relative increase rate of light intensity of 53.66%
and 79.58%, in the Ss with a single layer of SGMFs of Ø1.5mm and of Ø2mm respectively. Furthermore, in the Ss with
two layers of SGMFs of Ø1.5mm and Ø2mm the relative increments were of 267.53 and 319.63% respectively.
Conclusion. The SGMFs are reliable in facilitating light diffusion within the light-curing composite resins.
... However, sometimes cavity design does not allow the polymerization within this distance (5,17). In previous studies the use of spherical glass mega fillers (SGMFs) was proposed in order to reduce the shrinkage of composite resin in direct restorations (18)(19)(20)(21)(22)(23). By means of both clinical evidences and in vitro experiments it has been possible to observe that SGMFs enabled the bulk polymerization, of the composite, in particular in the deep proximal boxes of Black class II cavities. ...
... SGMFs are introduced into the mass of the composite prior to its polymerization in order to reduce the amount of resinous matrix, thus reducing the polymerization shrinkage. Furthermore SGMFs significantly contribute to the reduction of the adhesive interface solicitation; help to improve the marginal seal in interproximal cavities with cervical margins on the root cementum; facilitate the light diffusion in the context of the filling material; allow to carry out a bulk polymerization; shift to a more coronal level, the shrink-age stress facilitating its dissipation by the cuspal compliance (18)(19)(20)(21)(22)(23). This is relevant since sometime lost teeth can be cause of legal quarrel (24,25) since they can substitute with dental implant or orthodontic treatment (77)(78)(79)(80)(81)(82)(83). ...
Purpose:
Evaluate how the spherical glass mega fillers (SGMFs) can positively interfere with light diffusion when incorporated in a composite restoration.
Materials and methods:
30 samples (Ss) were performed, applying 2 composite layers of 3 mm each: 6 were made with composite only; 6 with a layer of SGMFs of O1.5mm within the first layer of composite; 6 with 2 overlapping layers of SGMFs of O1.5mm; 6 with a layer of SGMFs of O2mm; 6 with 2 overlapping layers of SGMFs of O2mm. The curing time was set at 40s for the first layer, and 120s for the second layer, transilluminated through the first layer. Digital pictures were taken, in standardized settings, during the transillumination, and the light intensity was measured with a digital image analysis software.
Results:
From a lateral view the Ss with a single layer of SGMFs of O1.5mm and O2mm, the relative increments of light intensity, were of 24.37% and 33.33% respectively. Concerning the Ss made with 2 layers of SGMFs, the relative increments were of 67.99% and 66.4% respectively. In front view has emerged a relative increase rate of light intensity of 53.66% and 79.58%, in the Ss with a single layer of SGMFs of O1.5mm and of O2mm respectively. Furthermore, in the Ss with two layers of SGMFs of O1.5mm and O2mm the relative increments were of 267.53 and 319.63% respectively.
Conclusion:
The SGMFs are reliable in facilitating light diffusion within the light-curing composite resins.
Purpose:
The Authors analyzed the effect of spherical glass mega fillers (SGMF) on reducing contraction stress in dental composite resins, by means of a cavity model simulating the cuspal deflection which occurs on filled tooth cavity walls in clinical condition.
Materials and methods:
20 stylized MOD cavities (C-factor = 0.83) were performed in acrylic resin. The inner surface of each cavity was sand blasted and adhesively treated in order to ensure a valid bond with the composite resin. Three different diameter of SGMF were used (i.e. 1, 1,5, 2 mm). The samples were divided in 4 groups of 5 each: Group 1 samples filled with the composite only; Group 2 samples filled with composite added with SGMFs, Ø1mm (16 spheres for each sample); Group 3 samples filled with composite added with SGMFs, Ø1,5 mm (5 spheres for each sample); Group 4 samples filled with composite added with SGMFs, Ø2 mm (2 spheres for each sample). Digital pictures were taken, in standardized settings, before and immediately after the polymerization of the composite material, placed into the cavities. With a digital image analysis software the distances from the coronal reference points of the cavity walls were measured. Then the difference between the first and second measurement was calculated. The data were analyzed by means of the ANOVA test.
Results:
A significative reduction on cavity walls deflection, when the composite resin is used in addiction with the SGMFs was observed. The SGMFs of smallest diameter (1mm) showed the better outcome.
Conclusion:
The SGMFs are reliable in reducing contraction stress in dental composite resins.
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