A STUDY ON THE EFFECTS OF FINISHING/POLISHING TIMING ON SURFACE FEATURES OF COMPOSITE RESTORATION

연마시기에 따른 복합레진의 표면 특성에 관한 연구

Proper finishing/polishing of dental restorations are critical clinical procedures that enhance both esthetics and longevity of restored teeth. This study was to compare the effects of immediate and delayed finishing/polishing procedures on the surface roughness and surface hardness of tooth-colored restoratives including two microfilled composite resins, such as Filtek A110 and Silux Plus, two hybrid composite resins, such as Revolution formular2 and Palfique Estelite. A total of 48 specimens were made for each material. The first 16 specimens served as the control group and the remaining 32 specimens were randomly divided into two equal groups. The control group was stored in distilled water at $37^{\circ}C$ for 1 week after light polymerization against the Mylar sheet. The first experimental group was finished/polished immediately after light polymerization and stored for 1 week in distilled water at $37^{\circ}C$, whereas the while the second group was finished/polished 1 week after light polymerization and stored in distilled water at $37^{\circ}C$. The results were as follows: 1. The smoothest surface was produced by Mylar sheet and finishing/polishing procedure increased the surface roughness. However, the surface roughness of composite resins were not influenced by the finishing/polishing timing. 2. There were significant differences about surface roughness between Revolution formular 2 and Silux Plus, regarding immediate finishing/polishing, and between Palfique Estelite and Silux Plus regarding delayed finishing/polishing(p<0.05). 3. The sequence of the surface hardness was ascending order by Revolution formular 2, Silux Plus, Filtek A110 and Palfique Estelite. However there were no significant differences about hardness among the control group and two finishing/polishing timing groups. 4. The effects of finishing/polishing time on surface roughness and hardness appeared to be material-dependent.

적절한 마무리와 연마는 치아 수복물의 심미성과 내구성 향상을 위해 필수적인 과정이다. 본 연구에서는 복합레진의 마무리/연마 과정 시행에 있어서 시기적 차이를 두어 마무리/연마 시기가 복합레진의 표면 거칠기와 경도에 미치는 영향을 비교하고자 하였다. 네 종류의 복합레진(Filtek A110, Silux Plus, Revolution formular2, Palfique Estelite)을 이용하여 시편을 제작하고 마무리/연마 과정을 거치지 않은 대조군과 중합 직후 마무리/연마를 시행한 경우와 1주 후 마무리/연마를 시행한 두 가지 실험군으로 구분하였다. 이 시편들의 표면 거칠기$(R_a\;value,\;{\mu}m)$와 경도(VHN)를 측정하고, 주사전자현미경으로 관찰하여 다음과 같은 결과를 얻었다. 1 네 가지 재료 모두 대조군에서 가장 활택한 표면을 얻었고 마무리/연마 과정을 거친 후 표면 거칠기가 증가하였으나, 마무리/연마시기에 따른 유의한 차이는 보이지 않았다. 2. 표면 거칠기는 중합 직후 마무리/연마를 시행한 경우 Silux Plus와 Revolution formular 2가 차이를 보였고, 1 주 후 시행한 경우 Silux Plus와 Palfique Estelite가 차이를 나타내었다(p<0.05). 3. 경도는 재료에 따라 Palfique Estelite > Filtek A110 > Silux Plus > Revolution formular 2 순으로 감소하였으나, 마무리/연마시기에 따른 차이는 보이지 않았다. 4. 마무리 연마시기가 표면 거칠기와 경도에 미치는 영향은 재료에 따라 차이를 보였다.