반복 사용된 IPS-Empress ceramic 의 물리적 성질에 관한 연구 : Part 1. 색안정성에 관한 연구 Part Ⅰ. Color stability

진태호,박현배 원광대학교 치의학연구소 1997 圓光齒醫學 Vol.7 No.2

The IPS-Empress system developed recently is one of the useful all ceramic restorative systems for esthetic rehabilitation, but the clinical application is restricted because of its high cost. This study was performed to investigate the color stability of reused IPS-Empress ceramic for recycling. Three groups of IPS-Empress ceramic specimens were obtained from first pressing, second pressing and third pressing. The color changes were measured by coloimeter(Model TC-6FX, Tokyo Denshoku Co.). The results were as follows: 1. The L and b value of IPS-Empress ceramic from second and third pressing were larger than those from first pressing but the a and E value were lesser. 2. The minute color change of IPS-Empress ceramic suggests its possibility of recycling.

반복 사용된 IPS Empress ceramic의 물리적 성질에 관한 연구 Part IV : 경도 및 파괴인성에 관한 연구

진태호,Jin Tai-Ho 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.4

Statement of the problem : IPS Empress ceramic has been used as one of a esthetic restorative material since it's development, but the broad application of IPS Empress ceramic to clinical prosthodontic field has been limited by its high material cost. Purpose : This study was investigated to evaluate the hardness and fracture toughness after recycling of the IPS Empress ceramic. Material and methods : Reused specimens of IPS Empress were fabricated with repeated pressing. The hardness(Vickers hardness) and fracture toughness of 1st, 2nd and 3rd pressed specimens were measured with Digital Micro Hardness Tester(Model MXT70, Matsuzawa Seiki Co., Ltd, Tokyo, Japan). The obtained data were analyzed using SPSS(Ver 9.5). Result : The mean value of the hardness in the 1st, 2nd and 3rd pressed Empress were $6.23{\pm}0.48MPa,\;5.50{\pm}0.25MPa$, and $5.70{\pm}0.42MPa$. The hardness of the 1st pressing ceramic was higher than those or the 2nd and 3rd pressed ceramics(P<0.05). Hardness of the 3rd pressed ceramic was greater than that of the 2nd pressed ceramic. but there was no significant difference of hardness between those two(P>0.05). The mean value of the fracture toughness was $1.71{\pm}0.16MPam^{1/2}$ in 1st pressed ceramic, $1.78{\pm}0.10MPam^{1/2}$ in 2nd pressed and $1.73{\pm}0.14MPam^{1/2}$ in 3rd pressed IPS ceramic. Fracture toughness of the 2nd pressed ceramic was the highest and that of the 1st pressed ceramic was the lowest. There was no significant difference of fracture toughness among them(P>0.05). Conclusion : Hardness of the 2nd and 3rd pressed IPS Empress ceramics were lesser than that of 1st pressed IPS Empress ceramic(P<0.05), but there was no significant changes of fracture toughness among them(P>0.05).

Clinical study on the maxillofacial prosthodontic treatment using dental implant: Part I-Color stability of maxillofacial elastomeric materials

진태호,Jin, Tai-Ho,Bowley, John F. The Korean Academy of Prosthodonitics 1998 대한치과보철학회지 Vol.36 No.2

본 연구는 악안면보철용 실리콘의 색안정성을 연구하기 위하여 실리콘 재료로 MDX 4-4210 Silicone(Dow Coming. Midland, Mich.)과 A-2186(Factor II, Lakeside, Az)을 사용하고 Mars Violet. Golden Yellow, Red yellow, Raw Sienna등 4종의 색소(Factor II, Lakeside, Az)를 이용하여 시편을 제작한 후 1군은 섭씨5-55도에서 700회 thermocycling하였고, 2군은 10%의 비눗물(Ivory, Proctor & Gamble Inc,. Toronto, Ontario)에 담아 섭씨15-55도에서 700회 thermocycling하였다. 3군은 10%의 비눗물에 담아 75일간 실온에서 보관하였으며 4군은 실온의 암실에 75일간 보관하였다. 5군은 초여름인 6월 중순부터 75일간 햇볕이 잘드는 곳에 위치하였다. 이를 측색색차계(Model TC-6FX, Tokyo Denshoku Co., Japan)를 이용하여 측정하고 색변화를 연구한 결과 다음과 같은 결론을 얻었다. 1. $L^*$값의 경우 모든 실험군에서 대조군에 비해 유의하게 감소하였다. 2. $a^*$값의 경우 대부분의 실험군에서 증가하였으나 Raw sienna, Mars violet색소를 사용한 실험 3.4.5군의 MDX4-4210의 경우 감소하는 경향을 보였다. 3. $b^*$값은 실험1.2.3군의 경우 대부분 감소하였고 실험4.5.군의 경우에서 증가하였으나 3.4.5군의 경우에서 대부분 유의한 차이가 없었다. 4. ${\Delta}E$의 값은 실험군에서 대부분 감소하였으나 4군의 A-2186에서 증가하는 경향을 보였고 실험2군의 Red yellow, Mars violet을 사용한 MDX4-4210에서 비교적 큰 변화를 보였다. 5. $L^{\ast}$값과 a값의 변화량의 합은 A-2186의 경우에서 크게 나타났으나 ${\Delta}E$값의 변화량은 MDX4-4210에서 크게 나타났다. 6. $L^*$값의 변화량의 합은 실험4군에서 크게 나타났으며 $a^*$값은 1군에서, $b^*$값과 ${\Delta}E$값의 변화량의 합은 2군에서 크게 나타났다.

반복 사용된 IPS Empress ceramic의 물리적 성질에 관한 연구 Part III. 염색저항성에 관한 연구

진태호,송영국,Jin, Tai-Ho,Song, Young-Kuk 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.6

The purpose of this study was to investigate the possibility on recycling of IPS Empress ceramic for the wide use of esthetically pleased IPS-Empress ceramic in clinical prosthodontic treatment. The specimens were made of first, second, and third pressed IPS Empress ceramic and were immersed in 0.05% methylene blue solution for 24hours. The amount of color change before and after stain-ning was measured with colorimeter(Model Tc-6Fx, Denshoku Co., Tokyo, Japan). The change of ${\Delta}E$ in first pressed ceramic was 18.33 and those in second and third pressed ceramics were 19.33 and 19.93 respectively. Although there was statistical difference among them, the differences were minute and acceptable. From the results of this study, the possibility of recycling of IPS Empress ceramic could be suggested.

반복사용된 IPS-Empress ceramic의 물리적 성질에 관한 연구 Part II:굽힘강도에 관한 연구

진태호,김희진,Jin, Tai-Ho,Kim, Hee-Jin 대한치과보철학회 1998 대한치과보철학회지 Vol.36 No.3

The purpose of this study was to investigate the possibility on recycling of IPS-Empress ceramic for the wide use of IPS-Empress ceramic in prosthodontic treatment. The frexure strength of first pressed, second pressed, and third pressed IPS-Empress ceramic were measured and compared. There was no ststistical difference among three groups, and the result of this study implied the recycled IPS-Empress ceramic has enough frexure strength for clinical use.

圓光大學校 齒科大學 附속病院 補綴科 外來患者의 特性에 關한 調査 硏究

陳泰淏 圓光大學校 醫科學硏究所 1986 圓光醫科學 Vol.2 No.1

The author studied the quality of prosthodontic treatment of the out patients in Won Kwang University Dental hospital from the January of 1985 to the October of 1986. The results were as follows ; 1. The patients in twenties were the most in all age groups and the sex distribution was similiar. 2. The ratio of tooth-loss was the highest for the first molar. 3. The missing area was mainly treated by fixed partial dentures. Porcelain fused to metal crown for anterial part, gold or metal crown for posterior part was used.

국소의치의 설계(성공과 실패)

진태호 대한치과의사협회 2000 대한치과의사협회지 Vol.38 No.1

Ⅳ. 국소의치에 있어서의 인공치 선택

진태호 대한치과의사협회 1989 대한치과의사협회지 Vol.27 No.6

의치 수리용 레진의 색안정성과 결합강도에 관한 연구

진태호,Jin, Tai-Ho 대한치과보철학회 1995 대한치과보철학회지 Vol.33 No.1

This study was performed to investigate the color stability and shear bond strength of denture repair resins. The denture base resins used in this study were Premium Super-20(Lang Dental Mfg. Co., Inc.,.U.S.A.) as heat curing resin, Triad VLC Denture Base(Dentsply/York Division, U.S.A.), Triad Reline Material(Dentsply/York Division, U.S.A.), Repair Acrylic(Lang Dental Mfg. Co., Inc.,. U.S.A.), Toughron Rebase (MikiChemical Product, Kyoto, Japan), and Tokuso Rebase(Tokuyama Soda Co., Ltd., Japan) as denture repair resin. After fabrication of specimens, they stored for 20 months, then color changes and shear bond strength were measured by colorimeter(Model TC-6FX, Tokyo Denshoku Co.) and Instron Universial Test Machine. The results were as follows : 1. There were changes of $L^{\ast},\;a^{\ast},\;b^{\ast}$ and $DE^{\ast}$ in Triad VLC Denture Base after 20 months. 2. There were changes of $a^{\ast}$ in Toughron Rebase and Tokuso Rebase, and $b^{\ast}$ in Tokuso Rebase after 20 months. 3. The shear bond strength of Repair Acrylic and Toughron Rebase were higher than that of Tokuso Rebase and Triad Reline Material.

균형측 교합장애가 저작근 활성도 및 과로에 미치는 영향에 관한 연구

진태호,이호용,Jin, Tai-Ho,Lee, Ho-Yong 대한치과보철학회 1989 대한치과보철학회지 Vol.27 No.1

The purpose of this study was to investigate the influence of balancing interference on the activity of masticatory muscles and condylar path. Eight dental students of Won Kwang University without any symptoms of temporomandibular disorder and occlusal interferences, were selected for this study, The balancing interference was provided by construction and cementation of cast metal crowns on the upper and lower first molars. For the measurement of muscle activity, bioelectric processor (EM2, Myotronic Res., Inc., U.S.A.) was used and for the condular path, computerized electronic pantograph (Pantronics, Denar Corp., U.S.A.) was used and the myographic recordings were taken bilaterally from the anterior temporal, masseter and digastric muscles on rest position and on functions. These experimental procedures were done before cementation of experimental crown, three days after cementation of experimental crown, one week after, two weeks after and then one week after removal of experimental crown. The results are as follows: 1. The PRI score was increased at three days after application of balancing interference, and decreased at two weeks after. 2. Three subjects showed mild symptom of temporomandibular disorder at three or four days after application of interference, but the symptom was subsided in one or two weeks after application of interference. 3. One week after application of balancing interference, the activity of ipsilateral anterior temporal muscle in four subjects was decreased on gum chewing at experimental site. 4. Three days after application of balancing interference, the activity of ipsilateral anterior temporal muscle in three subjects was increased on gum chewing at non-experimental site. 5. The influence of balancing interference on the activity of anterior temporal, masseter and gigastric muscle was not prominent.