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Effect of acid etching on bond strength of nanoionomer as an orthodontic bonding adhesive.

Khan S, Verma SK, Maheshwari S - J Orthod Sci (2015 Oct-Dec)

Bottom Line: The nanoionomer groups gave significantly lower ARI values than the conventional adhesive group.Based on this in-vitro study, nanoionomer with etching can be successfully used as an orthodontic bonding agent leaving less adhesive remnant on enamel surface, making cleaning easier.However, in-vivo studies are needed to confirm the validity of present findings.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Dr. Z. A. Dental College, Aligarh Muslim University, Aligarh, Uttar Pradesh, India.

ABSTRACT

Aims: A new Resin Modified Glass Ionomer Cement known as nanoionomer containing nanofillers of fluoroaluminosilicate glass and nanofiller 'clusters' has been introduced. An in-vitro study aimed at evaluating shear bond strength (SBS) and adhesive remnant index (ARI) of nanoionomer under etching/unetched condition for use as an orthodontic bonding agent.

Material and methods: A total of 75 extracted premolars were used, which were divided into three equal groups of 25 each: 1-Conventional adhesive (Enlight Light Cure, SDS, Ormco, CA, USA) was used after and etching with 37% phosphoric acid for 30 s, followed by Ortho Solo application 2-nanoionomer (Ketac(™) N100, 3M, ESPE, St. Paul, MN, USA) was used after etching with 37% phosphoric acid for 30 s 3-nanoionomer was used without etching. The SBS testing was performed using a digital universal testing machine (UTM-G-410B, Shanta Engineering). Evaluation of ARI was done using scanning electron microscopy. The SBS were compared using ANOVA with post-hoc Tukey test for intergroup comparisons and ARI scores were compared with Chi-square test.

Results: ANOVA (SBS, F = 104.75) and Chi-square (ARI, Chi-square = 30.71) tests revealed significant differences between groups (P < 0.01). The mean (SD) SBS achieved with conventional light cure adhesive was significantly higher (P < 0.05) (10.59 ± 2.03 Mpa, 95% CI, 9.74-11.41) than the nanoionomer groups (unetched 4.13 ± 0.88 Mpa, 95% CI, 3.79-4.47 and etched 9.32 ± 1.87 Mpa, 95% CI, 8.58-10.06). However, nanoionomer with etching, registered SBS in the clinically acceptable range of 5.9-7.8 MPa, as suggested by Reynolds (1975). The nanoionomer groups gave significantly lower ARI values than the conventional adhesive group.

Conclusion: Based on this in-vitro study, nanoionomer with etching can be successfully used as an orthodontic bonding agent leaving less adhesive remnant on enamel surface, making cleaning easier. However, in-vivo studies are needed to confirm the validity of present findings.

No MeSH data available.


Related in: MedlinePlus

Universal testing machine (a) showing the orientation for alignment loading blade of UTM (b)
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Figure 1: Universal testing machine (a) showing the orientation for alignment loading blade of UTM (b)

Mentions: Debonding and shear bond testing were performed after 24 h from bonding using a digital universal testing machine (UTM-G-410B, Shanta Engineering) [Figure 1]. The specimen was clamped in the attachment and a tangential load directed at the ligature groove was applied by the loading plunger at a crosshead speed of 1 mm/min. The load obtained was then divided by the bracket base area which was 9.152 mm2 (measured by Optical Profile Projector); to obtain SBS in Megapascal (MPa). After debonding, all teeth specimen were examined under a Scanning Electron Microscope (JEOL, JSM-6510 Series). ARI scoring (0-3) was recorded as given by Artun and Bergland.[17] ARI demonstrated mode of failure, occurring either at bracket-adhesive interface leaving greater ARI or at enamel-adhesive interface with lesser ARI.


Effect of acid etching on bond strength of nanoionomer as an orthodontic bonding adhesive.

Khan S, Verma SK, Maheshwari S - J Orthod Sci (2015 Oct-Dec)

Universal testing machine (a) showing the orientation for alignment loading blade of UTM (b)
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4759974&req=5

Figure 1: Universal testing machine (a) showing the orientation for alignment loading blade of UTM (b)
Mentions: Debonding and shear bond testing were performed after 24 h from bonding using a digital universal testing machine (UTM-G-410B, Shanta Engineering) [Figure 1]. The specimen was clamped in the attachment and a tangential load directed at the ligature groove was applied by the loading plunger at a crosshead speed of 1 mm/min. The load obtained was then divided by the bracket base area which was 9.152 mm2 (measured by Optical Profile Projector); to obtain SBS in Megapascal (MPa). After debonding, all teeth specimen were examined under a Scanning Electron Microscope (JEOL, JSM-6510 Series). ARI scoring (0-3) was recorded as given by Artun and Bergland.[17] ARI demonstrated mode of failure, occurring either at bracket-adhesive interface leaving greater ARI or at enamel-adhesive interface with lesser ARI.

Bottom Line: The nanoionomer groups gave significantly lower ARI values than the conventional adhesive group.Based on this in-vitro study, nanoionomer with etching can be successfully used as an orthodontic bonding agent leaving less adhesive remnant on enamel surface, making cleaning easier.However, in-vivo studies are needed to confirm the validity of present findings.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Dr. Z. A. Dental College, Aligarh Muslim University, Aligarh, Uttar Pradesh, India.

ABSTRACT

Aims: A new Resin Modified Glass Ionomer Cement known as nanoionomer containing nanofillers of fluoroaluminosilicate glass and nanofiller 'clusters' has been introduced. An in-vitro study aimed at evaluating shear bond strength (SBS) and adhesive remnant index (ARI) of nanoionomer under etching/unetched condition for use as an orthodontic bonding agent.

Material and methods: A total of 75 extracted premolars were used, which were divided into three equal groups of 25 each: 1-Conventional adhesive (Enlight Light Cure, SDS, Ormco, CA, USA) was used after and etching with 37% phosphoric acid for 30 s, followed by Ortho Solo application 2-nanoionomer (Ketac(™) N100, 3M, ESPE, St. Paul, MN, USA) was used after etching with 37% phosphoric acid for 30 s 3-nanoionomer was used without etching. The SBS testing was performed using a digital universal testing machine (UTM-G-410B, Shanta Engineering). Evaluation of ARI was done using scanning electron microscopy. The SBS were compared using ANOVA with post-hoc Tukey test for intergroup comparisons and ARI scores were compared with Chi-square test.

Results: ANOVA (SBS, F = 104.75) and Chi-square (ARI, Chi-square = 30.71) tests revealed significant differences between groups (P < 0.01). The mean (SD) SBS achieved with conventional light cure adhesive was significantly higher (P < 0.05) (10.59 ± 2.03 Mpa, 95% CI, 9.74-11.41) than the nanoionomer groups (unetched 4.13 ± 0.88 Mpa, 95% CI, 3.79-4.47 and etched 9.32 ± 1.87 Mpa, 95% CI, 8.58-10.06). However, nanoionomer with etching, registered SBS in the clinically acceptable range of 5.9-7.8 MPa, as suggested by Reynolds (1975). The nanoionomer groups gave significantly lower ARI values than the conventional adhesive group.

Conclusion: Based on this in-vitro study, nanoionomer with etching can be successfully used as an orthodontic bonding agent leaving less adhesive remnant on enamel surface, making cleaning easier. However, in-vivo studies are needed to confirm the validity of present findings.

No MeSH data available.


Related in: MedlinePlus