Related Experiment Video
Updated: May 10, 2026
03:02
Impact of Fabrication Techniques and Polishing Procedures on Surface Roughness of Denture Base Resins
Published on: January 17, 2025
Influence of two different bracket base cleaning procedures on shear bond strength reliability
1Department of Orthodontics, Hacettepe University Faculty of Dentistry, Turkey. muge.aksu@hacettepe.edu.tr
The Journal of Contemporary Dental Practice
|July 2, 2013
Summary
Sandblasting effectively cleans recycled orthodontic brackets, maintaining sufficient bond strength. Carbide bur cleaning reduces bond strength, and previously bonded surfaces do not significantly impact bracket adhesion.
Area of Science:
- Dental Materials Science
- Orthodontic Technology
- Biomaterials Engineering
Background:
- Bracket reprocessing is crucial for cost-effectiveness in orthodontics.
- Evaluating cleaning methods for recycled brackets is essential for clinical success.
- Understanding the impact of prior bonding on tooth surfaces is important.
Purpose of the Study:
- To compare the shear bond strength of orthodontic brackets after sandblasting versus carbide bur cleaning.
- To assess the influence of a previously bonded tooth surface on bracket bond strength.
Main Methods:
- 120 new brackets were bonded, debonded, and then cleaned using sandblasting or carbide bur.
- Recycled brackets were bonded to new and previously used premolar teeth.
- Shear bond strength was remeasured after rebonding.
Main Results:
- Sandblasting recycled brackets yielded bond strengths comparable to new brackets.
- Carbide bur cleaning significantly reduced the bond strength of recycled brackets.
- The history of a bonded tooth surface did not significantly alter bond strength.
Conclusions:
- Sandblasting is a viable method for reprocessing orthodontic brackets, ensuring adequate bond strength.
- Carbide bur cleaning should be used with caution due to reduced bond strength.
- Clinicians can be assured that previously bonded surfaces do not compromise bond strength.
Related Concept Videos
01:12Bonding and Strength of Aggregate
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
01:14Testing Water Quality
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
01:20Strength of Cement
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in ASTM C...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in ASTM C...