PENGARUH KONSENTRASI DAN LAMA; WAKTU APLIKASI SODIUM ASKORBAT TERHADAP KEBOCORAN MIKRO TUMPATAN RESIN KOMPOSIT KAVITAS KELAS I PASCA BLEACHING INTRAKORONAL DENGAN HIDROGEN PEROKSIDA 350/0

Abstract

Intracoronal  bleaching  using 35% hydrogen  peroxide can increase  microleakage  in composite  resin filling.
To reduce  microleakage   can be done  by the application  of sodium  ascorbate.  The  purpose  of this  study  was  to
determine  the effect of concentration   sodium  ascorbate  10% and 25% also application  period sodium  ascorbate  1
day and 3 days on rnlcroleakaqe  of composite  resin filling after it was bleached  with 35% hydrogen  peroxide.
Twenty five specimens  of mandibular fisrt premolar teeth was cut 2 mm apical direction  of the CEJ, prepared
with  inverted  cone  bur, diameter  of occlusal  cavity was  3 mm, and  diameter  of apical  cavity  was 2 mm. Cervical
barrier  was  applied  2 mm thickness   in the  apical  direction  of CEJ  with  RMGI.  Tooth  specimens  were  randomly
divided  into 5 groups,  each group contained  5 teeth. Group 1 (control)  was applied with hydrogen  peroxide  (H202)
35% 3 days for 3 times, groups of 2-5 were bleached with hydrogen  peroxide  35% then various  concentration  and
application  period of sodium ascorbate  (SA) were applied.  Group 2 was applied  10% of SA for 1 day. Group 3 was
applied  10% of SA for .3 days.  Group  4 was  applied  25% of SA for  1 day. Group  5 was  applied  25% of SA for 3
days. All groups were  put in 370C incubator. After that the teeth were filled with composite  resin using incremental
technique,  soaked  in 2% methylene  blue solution for 24 hours, then the microleakage  was evaluated

Two-way Anova  showed  significant  difference  in microleakage  after various  application   period  of sodium
ascorbate  (p<0.05),  there was no significant  difference  in microleakage  values in concentration   of sodium  ascorbate
(p> 0.05). LSD test showed  that there was significant  difference between the  application  period of sodium  ascorbate:
1 day, 3 days, and control.                                                                                                                  
From this research  it could be concluded  that the use of 10% and 25% sodium  ascorbate  after bleaching
with 35% hydrogen  peroxide  did not reduce the microleakage  of composite  resin.  Microleakage   of composite  resin
filling after bleaching  with 35%  hydrogen  peroxide  that followed  by application  of sodium  ascorbate  for 3 days was
below the one that was applied  for 1 day.