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Effects of fluorosis and bleaching on shear bond strengths of orthodontic brackets.

Adanir N, Türkkahraman H, Güngör AY - Eur J Dent (2007)

Bottom Line: After bonding, shear bond strengths of the brackets were tested with Universal testing machine.The results showed that fluorosis only and bleaching of fluorosed teeth significantly reduced the bond strengths of the orthodontic brackets (P < .001).Although bleaching of fluorosed teeth decreased the values more, no statistically significant difference was found between fluorosis group and fluorosis+bleaching group (P > .05).

View Article: PubMed Central - PubMed

Affiliation: Assistant Professor, Department of Endodontics, Faculty of Dentistry, University of Suleyman Demirel.

ABSTRACT

Objectives: To evaluate the effects of fluorosis and bleaching on shear bond strengths of orthodontic brackets.

Methods: A total of 45 (30 fluorosed and 15 non-fluorosed) non-carious freshly extracted human permanent premolar teeth which were extracted for orthodontic reasons and without any caries or visible defects were used in this study. Fluorosed teeth were selected according to the modified Thylstrup and Fejerskov index (TFI), which is based on the clinical changes in fluorosed teeth. First group consisted of 15 fluorosed teeth. Second group of fluorosed teeth were bleached with a 35% hydrogen peroxide office bleaching agent. Third group served as control. No bleaching procedure was applied. Orthodontic brackets were bonded with a light cure composite resin and cured with a halogen light. After bonding, shear bond strengths of the brackets were tested with Universal testing machine.

Results: The results showed that fluorosis only and bleaching of fluorosed teeth significantly reduced the bond strengths of the orthodontic brackets (P < .001). Although bleaching of fluorosed teeth decreased the values more, no statistically significant difference was found between fluorosis group and fluorosis+bleaching group (P > .05).

Conclusions: Fluorosis and bleaching of fluorosed teeth reduce bracket bond strength to enamel, but the bond strength with these still exceed the minimum 6 to 8 MPa required to expect adequate clinical performance.

No MeSH data available.


Related in: MedlinePlus

Chalky white appearance of fluorosed teeth.
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f1-0010230: Chalky white appearance of fluorosed teeth.

Mentions: Tooth discoloration may be classified as intrinsic, extrinsic, and a combination of both.1 Intrinsic discoloration occurs following a change to the structural composition or thickness of the dental hard tissues. Intrinsic tooth discoloration is caused by aging, microcracks in the enamel, tetracycline medication, restoration, dental caries and excessive fluoride ingestion.2 Excessive fluoride in drinking water, greater than 1 to 2 ppm, can cause metabolic alteration in the ameloblasts, resulting in a defective matrix and improper calsification of teeth. An affected tooth shows a hypomineralized, porous subsurface enamel and acid-resistant well-mineralized surface layer (Figure 1).3


Effects of fluorosis and bleaching on shear bond strengths of orthodontic brackets.

Adanir N, Türkkahraman H, Güngör AY - Eur J Dent (2007)

Chalky white appearance of fluorosed teeth.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2609915&req=5

f1-0010230: Chalky white appearance of fluorosed teeth.
Mentions: Tooth discoloration may be classified as intrinsic, extrinsic, and a combination of both.1 Intrinsic discoloration occurs following a change to the structural composition or thickness of the dental hard tissues. Intrinsic tooth discoloration is caused by aging, microcracks in the enamel, tetracycline medication, restoration, dental caries and excessive fluoride ingestion.2 Excessive fluoride in drinking water, greater than 1 to 2 ppm, can cause metabolic alteration in the ameloblasts, resulting in a defective matrix and improper calsification of teeth. An affected tooth shows a hypomineralized, porous subsurface enamel and acid-resistant well-mineralized surface layer (Figure 1).3

Bottom Line: After bonding, shear bond strengths of the brackets were tested with Universal testing machine.The results showed that fluorosis only and bleaching of fluorosed teeth significantly reduced the bond strengths of the orthodontic brackets (P < .001).Although bleaching of fluorosed teeth decreased the values more, no statistically significant difference was found between fluorosis group and fluorosis+bleaching group (P > .05).

View Article: PubMed Central - PubMed

Affiliation: Assistant Professor, Department of Endodontics, Faculty of Dentistry, University of Suleyman Demirel.

ABSTRACT

Objectives: To evaluate the effects of fluorosis and bleaching on shear bond strengths of orthodontic brackets.

Methods: A total of 45 (30 fluorosed and 15 non-fluorosed) non-carious freshly extracted human permanent premolar teeth which were extracted for orthodontic reasons and without any caries or visible defects were used in this study. Fluorosed teeth were selected according to the modified Thylstrup and Fejerskov index (TFI), which is based on the clinical changes in fluorosed teeth. First group consisted of 15 fluorosed teeth. Second group of fluorosed teeth were bleached with a 35% hydrogen peroxide office bleaching agent. Third group served as control. No bleaching procedure was applied. Orthodontic brackets were bonded with a light cure composite resin and cured with a halogen light. After bonding, shear bond strengths of the brackets were tested with Universal testing machine.

Results: The results showed that fluorosis only and bleaching of fluorosed teeth significantly reduced the bond strengths of the orthodontic brackets (P < .001). Although bleaching of fluorosed teeth decreased the values more, no statistically significant difference was found between fluorosis group and fluorosis+bleaching group (P > .05).

Conclusions: Fluorosis and bleaching of fluorosed teeth reduce bracket bond strength to enamel, but the bond strength with these still exceed the minimum 6 to 8 MPa required to expect adequate clinical performance.

No MeSH data available.


Related in: MedlinePlus