TY  - THES
AB  - This study evaluated the effects of two curing light sources on contraction stress and degree of conversion (DC) of an orthodontic adhesive over time. Transbond XT adhesive was cured using either a halogen or a second‑generation LED light, and contraction stress was measured at multiple time points up to 24 hours. Degree of conversion was assessed using FTIR spectroscopy. Results showed that the LED produced significantly greater contraction stress than the halogen light when equal energy was applied, while DC was not affected by light source. Both contraction stress and DC increased over time, with the highest values at 24 hours. These findings suggest that curing light characteristics influence stress development independently of conversion and may have clinical implications for bond strength.
AD  - Oregon Health and Science University
AU  - Borgen, Kari
DA  - 2006
DO  - 10.6083/M45Q4TBJ
DO  - DOI
ID  - 2203
KW  - Orthodontic Appliances
KW  - Dental Bonding
KW  - Materials Testing
KW  - Dental Stress Analysis
KW  - Spectroscopy, Fourier Transform Infrared
KW  - Transbond XT
L1  - https://digitalcollections.ohsu.edu/record/2203/files/2932_etd.pdf
L2  - https://digitalcollections.ohsu.edu/record/2203/files/2932_etd.pdf
L4  - https://digitalcollections.ohsu.edu/record/2203/files/2932_etd.pdf
LK  - https://digitalcollections.ohsu.edu/record/2203/files/2932_etd.pdf
N2  - This study evaluated the effects of two curing light sources on contraction stress and degree of conversion (DC) of an orthodontic adhesive over time. Transbond XT adhesive was cured using either a halogen or a second‑generation LED light, and contraction stress was measured at multiple time points up to 24 hours. Degree of conversion was assessed using FTIR spectroscopy. Results showed that the LED produced significantly greater contraction stress than the halogen light when equal energy was applied, while DC was not affected by light source. Both contraction stress and DC increased over time, with the highest values at 24 hours. These findings suggest that curing light characteristics influence stress development independently of conversion and may have clinical implications for bond strength.
PB  - Oregon Health and Science University
PY  - 2006
T1  - The effect of curing light source on polymerization contraction stress and degree of conversion over time in an orthodontic adhesive
TI  - The effect of curing light source on polymerization contraction stress and degree of conversion over time in an orthodontic adhesive
UR  - https://digitalcollections.ohsu.edu/record/2203/files/2932_etd.pdf
Y1  - 2006
ER  -