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How Is the Enamel Affected by Different Orthodontic Bonding Agents and Polishing Techniques?

Heravi F, Shafaee H, Abdollahi M, Rashed R - J Dent (Tehran) (2015)

Bottom Line: There were significantly more enamel cracks in the Transbond XT group after debonding and polishing compared to the Maxcem Elite group.Polishing did not cause any statistically significant change in crack length.The SBS of Maxcem Elite was significantly lower than that of Transbond XT (95% confidence interval).

View Article: PubMed Central - PubMed

Affiliation: Associate Professor, Department of Orthodontics, School of Dentistry and Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT

Objectives: The objective of this study was to assess the effect of new bonding techniques on enamel surface.

Materials and methods: Sixty upper central incisors were randomly divided into two equal groups. In the first group, metal brackets were bonded using TransbondXT and, in the second group, the same brackets were bonded with Maxcem Elite. The shear bond strength (SBS) of both agents to enamel was measured and the number and length of enamel cracks before bonding, after debonding and after polishing were compared. The number of visible cracks and the adhesive remnant index (ARI) scores in each group were also measured.

Results: There were significantly more enamel cracks in the Transbond XT group after debonding and polishing compared to the Maxcem Elite group. There was no significant difference in the length of enamel cracks between the two groups; but, in each group, a significant increase in the length of enamel cracks was noticeable after debonding. Polishing did not cause any statistically significant change in crack length. The SBS of Maxcem Elite was significantly lower than that of Transbond XT (95% confidence interval).

Conclusion: Maxcem Elite offers clinically acceptable bond strength and can thus be used as a routine adhesive for orthodontic purposes since it is less likely to damage the enamel.

No MeSH data available.


Related in: MedlinePlus

Force application simulating clinical use of debonding pliers mounted on Zwick. a: The distance from the point of force application to the fulcrum of the pliers. b: The distance from the point of actual force application to the fulcrum of the pliers
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Figure 2: Force application simulating clinical use of debonding pliers mounted on Zwick. a: The distance from the point of force application to the fulcrum of the pliers. b: The distance from the point of actual force application to the fulcrum of the pliers

Mentions: The debonding force recorded by the Zwick is not equal to the actual force applied at the bracket –adhesive interface because the force was applied at a predetermined distance on the pliers’ beaks. These forces, however, are proportional and can be expressed in the following ratio: The actual force (F) equals the measured force (f) multiplied by (a) divided by (b): F= f (a/b). In this ratio, (a) is the distance from the point of force application to the fulcrum of the pliers and (b) is the distance from the point of actual force application to the fulcrum of the pliers. The calculated ratio was 0.77 (Figure 2). Deboning force was measured in Newton and was then converted to MegaPascal (Mpa). Surface area under the base of bracket was 9.8mm2. After debonding, the buccal surfaces of the teeth in each group were examined by the same stereomicroscope and the magnified images (23.9 x) were taken with the same digital camera. The number of enamel cracks and the length and the direction of each crack were assessed with the aid of the same software.


How Is the Enamel Affected by Different Orthodontic Bonding Agents and Polishing Techniques?

Heravi F, Shafaee H, Abdollahi M, Rashed R - J Dent (Tehran) (2015)

Force application simulating clinical use of debonding pliers mounted on Zwick. a: The distance from the point of force application to the fulcrum of the pliers. b: The distance from the point of actual force application to the fulcrum of the pliers
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4663308&req=5

Figure 2: Force application simulating clinical use of debonding pliers mounted on Zwick. a: The distance from the point of force application to the fulcrum of the pliers. b: The distance from the point of actual force application to the fulcrum of the pliers
Mentions: The debonding force recorded by the Zwick is not equal to the actual force applied at the bracket –adhesive interface because the force was applied at a predetermined distance on the pliers’ beaks. These forces, however, are proportional and can be expressed in the following ratio: The actual force (F) equals the measured force (f) multiplied by (a) divided by (b): F= f (a/b). In this ratio, (a) is the distance from the point of force application to the fulcrum of the pliers and (b) is the distance from the point of actual force application to the fulcrum of the pliers. The calculated ratio was 0.77 (Figure 2). Deboning force was measured in Newton and was then converted to MegaPascal (Mpa). Surface area under the base of bracket was 9.8mm2. After debonding, the buccal surfaces of the teeth in each group were examined by the same stereomicroscope and the magnified images (23.9 x) were taken with the same digital camera. The number of enamel cracks and the length and the direction of each crack were assessed with the aid of the same software.

Bottom Line: There were significantly more enamel cracks in the Transbond XT group after debonding and polishing compared to the Maxcem Elite group.Polishing did not cause any statistically significant change in crack length.The SBS of Maxcem Elite was significantly lower than that of Transbond XT (95% confidence interval).

View Article: PubMed Central - PubMed

Affiliation: Associate Professor, Department of Orthodontics, School of Dentistry and Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT

Objectives: The objective of this study was to assess the effect of new bonding techniques on enamel surface.

Materials and methods: Sixty upper central incisors were randomly divided into two equal groups. In the first group, metal brackets were bonded using TransbondXT and, in the second group, the same brackets were bonded with Maxcem Elite. The shear bond strength (SBS) of both agents to enamel was measured and the number and length of enamel cracks before bonding, after debonding and after polishing were compared. The number of visible cracks and the adhesive remnant index (ARI) scores in each group were also measured.

Results: There were significantly more enamel cracks in the Transbond XT group after debonding and polishing compared to the Maxcem Elite group. There was no significant difference in the length of enamel cracks between the two groups; but, in each group, a significant increase in the length of enamel cracks was noticeable after debonding. Polishing did not cause any statistically significant change in crack length. The SBS of Maxcem Elite was significantly lower than that of Transbond XT (95% confidence interval).

Conclusion: Maxcem Elite offers clinically acceptable bond strength and can thus be used as a routine adhesive for orthodontic purposes since it is less likely to damage the enamel.

No MeSH data available.


Related in: MedlinePlus