| Autor: |
Marina, Simunovic Anicic, Vjera, Perkovic, Vanni, Lughi, Lucia, Pozzan, Senka, Mestrovic, Gianluca, Turco |
| Předmět: |
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| Zdroj: |
Acta Stomatologica Croatica; Jun2023, Vol. 57 Issue 2, p195-195, 1/4p |
| Abstrakt: |
Aim: To investigate a correlation between shear bond strenght (SBS) and degree of conversion (DC) of a three components bonding system and self-adhesive bonding system used for orthodontic brackets' bonding procedure. Materials and Methods: Sample consisted of 32 extracted intact permanent premolars (no cavities, fillings or white spot leasions) randomly divided into two groups (n=16). Teeth were fixed in cubic plastic molds with cold-curing methacrylate resin. Acid etching was performed using 37% phosphoric acid for 15 s, rinsed for 20 s and then dried for 10 s. In Group I the metal brackets were bonded with Transbond XT Primer and Transbond XT Paste (3M Unitek, Monrovia, CA, USA). In Group II metal brackets were bonded with GC Ortho connect (GC America, Alsip, Illinois, USA). Resin was polymerised for 20 s from two directions (mesial and occlusal) using a Bluephase light-curing unit. SBS was measured using Universal testing machine-crosshead speed of 1 mm/min with an occlusal-gingival load applied parallel to the bracket's surface. For each sample, immediately after SBS testing, Raman microspectrometry was performed as well as Adhesive Remnant Index - ARI. Results: No statistically significant differences were observed among the experimental groups in terms of the SBS values. No statistically significant differences were observed among the experimental groups in terms of the ARI values. A significantly higher DC (p < .001) value was recorded in Group I, in which the brackets were bonded with GC. Very weak or no correlation (0.01) has been recorded between SBS and DC in Group 1 and moderate positive correlation has been recorded in Groups 2 (0.33). Conclusion: No difference was found in SBS between conventional and two step systems used in orthodontics. Two-step system demonstrated grater DC compared to conventional system. There is very weak or moderate correlation between DC and SBS. DC has minimal effect on SBS. [ABSTRACT FROM AUTHOR] |
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