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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

Shear bond strengths (MPa) of the groups. Results presented as boxplots. Horizontal line in middle of each boxplot shows median value; horizontal lines in box indicate 25% and 75% quartiles; lines outside box indicate 5% and 95% quartiles.
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f3-0010230: Shear bond strengths (MPa) of the groups. Results presented as boxplots. Horizontal line in middle of each boxplot shows median value; horizontal lines in box indicate 25% and 75% quartiles; lines outside box indicate 5% and 95% quartiles.

Mentions: The descriptive statistics on the shear bond strengths (MPa) of the groups are presented as boxplots in Figure 3. All groups displayed clinically acceptable mean bond strengths (over 8 MPa). Analysis of variance (ANOVA) indicated a significant difference between groups (P< .001) (Table 1). Highest values of shear bond strengths were measured in Group III (control). Shear bond strengths in Groups I and II were significantly lower than Group III (P< .001). No significant difference was found between Group I and Group II (P > .05).


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

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

Shear bond strengths (MPa) of the groups. Results presented as boxplots. Horizontal line in middle of each boxplot shows median value; horizontal lines in box indicate 25% and 75% quartiles; lines outside box indicate 5% and 95% quartiles.
© Copyright Policy
Related In: Results  -  Collection

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

f3-0010230: Shear bond strengths (MPa) of the groups. Results presented as boxplots. Horizontal line in middle of each boxplot shows median value; horizontal lines in box indicate 25% and 75% quartiles; lines outside box indicate 5% and 95% quartiles.
Mentions: The descriptive statistics on the shear bond strengths (MPa) of the groups are presented as boxplots in Figure 3. All groups displayed clinically acceptable mean bond strengths (over 8 MPa). Analysis of variance (ANOVA) indicated a significant difference between groups (P< .001) (Table 1). Highest values of shear bond strengths were measured in Group III (control). Shear bond strengths in Groups I and II were significantly lower than Group III (P< .001). No significant difference was found between Group I and Group II (P > .05).

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