• 박물관보존과학
• /
• 제14권
• /
• pp.29-35
• /
• 2013

백자투각연당초문지통과 같이 기형 및 장식기법이 복잡한 도자기의 경우, 기존에 사용되고 있는 복원제는 경화시간이 짧아 정교한 성형이 어려워 틀을 이용하여 복원한다. 하지만 틀을 이용한 복원 또한 시간적, 재료적인 단점이 있기 때문에 직접 복원하는 방법을 연구하고자 하였다. 복원제의 경화시간과 물성은 작업성과 밀접한 관계가 있기 때문에 복잡한 형태의 복원부를 직접 성형할 때는 충분한 가사시간이 확보되는 복원제가 필요하다. 소성점토(Original Sculpey)와 에폭시퍼티(Repair it Quik)를 각기 다른 비율로 혼합하여 가사시간, 색도 변화, 작업성에 대한 실험을 하였다. 실험결과 OS8 : RQ2의 비율로 혼합하였을 경우 가사시간이 충분하고 성형성이 좋았으며 황변도가 낮고 채색성이 좋아 가장 효과적이라는 것을 알 수 있었다.

• 대한치과기공학회지
• /
• 제24권1호
• /
• pp.9-18
• /
• 2002

The aim of this study is to propose effective measures for shortage of manpower of dental technology laboratory in Gangwon province by means of examining not only the history of Gangwon association, present condition of transference of members of Gangwon association from 1990, of missing members and annual rate of participation in repair education with setting object of study into Gangwon association under the influence of the Korean Dental Technology Association but also the present condition of opening and closing laboratory, amount of business connection and condition of shortage of manpower and its field with setting object of study into 28 dental technology laboratories. Results from this study are like followings : First, Gagnwon association was established in 1984 as the eleventh in the line of the board, reorganization of board is conducted 8 times up to the eighth in the line of the board in 2001. board is composed of 16 persons including president and operated its term as 3 years. Second, a number of representative and ordinary member of Gangwon association has increased gradually from 1992 to 2001. in aspect of annual rate of participation in repair education, representative's is more higher than ordinary member's overall. the worst rate of whole members' is shown as 47.9% and the its best rate is shown as 92.0%. in addition, 70$\sim$80% rate of participation into repair education is shown most frequently as 8 times of whole 20 times from 1992 to 2001. Third, 29 authorized dental technology laboratories have registered in Gangwon association until march 2002 within 9 cities and counties. in consideration of establishment location. Gangneung city has most amount as 7 laboratories(24.1%), Wonju city has 5(17.2%), Samcheok city and Sokcho city, each has 4(13.8%), Chuncheon city has 3(10.3%), Donghae city and Taeback city, each has 2(6.9%) and Yangyang and Yongwol county, each has 1(3.4%). Fourth, amount of work personnel of laboratory in Gangwon province is 1$\sim$10 persons as the maximum value. 23 laboratories(82.1%) have their own work personnel as amount of 5 and below. in aspect of main business, most of laboratories focus on the Porcelain and Crown. and 16 laboratories(57.1%) have their own expensive equipments such as Milling. its also suggests that 16 laboratories(57.1%) suffer their shortage of working personnel. specifically, 6 laboratories(21.4%) suffer the highest shortage especially in Denture field, Fifth, whole number of Gangwon association is up to 101 members (28 representatives and 73 ordinary members) until December 31th 2001. amount of immune from repair education of Gangwon association until October 2001 is up to 10 persons, and missing members from 1997 is up to 18 persons, suspension of business is up to 4 persons. in aspect of transference from 1990, transfer-in is up to 21 persons and transfer out is up to 16 persons.

• 대한치과보철학회지
• /
• 제49권2호
• /
• pp.161-167
• /
• 2011

연구 목적: 본 연구에서는 인공타액에 노출되었던 금속도재 수복물의 재소성이 도재 표면의 색조와 표면기포에 미치는 영향을 알아보고자 한다. 연구 재료 및 방법: 지름 10 mm, 두께 0.5 mm의 metal coping을 디스크 형태로 제작한 후 도재를 축성하여 금속 도재 수복물을 제작한 후, 표면의 색조를 spectroradiometer를 이용하여 측정하고, 표면기포의 수와 크기를 실체현미경으로 측정하였다. 인공타액에 7일간 담근 후 glazing firing 과정에 따라 재소성하였고, 재소성 후의 표면 색조, 표면기포의 수와 크기를 측정하였다. 재소성 전후의 색조 차이는 ${\Delta}E$로 표현하였고, 표면기포의 수는 paired t-test, 표면기포의 크기는 student t-test로 분석하였다 (${\alpha}$=0.05). 결과: 소성 전후 측정한 CIE Lab 값을 이용하여 계산한 결과, ${\Delta}E$=2.14 로 관찰되었다. 각 시편내의 표면기포 개수는 소성 전 $1.33{\pm}1.49$ 개, 소성 후 $3.27{\pm}2.90$ 개로 측정되 었으며, 소성 후 표면기포 개수는 통계적으로 유의하게 증가하였다 (P<.05). 각 시편내의 표면기포 크기는 소성 전 $81.97{\pm}32.03\;{\mu}m$, 소성 후 $142.94{\pm}47.40\;{\mu}m$로 측정되었으며, 소성 후 표면기포 크기는 통계적으로 유의하게 증가하였다 (P<.05). 결론: 소성 전후의 색변화가 인지되기는 하지만, 임상적으로 허용할 수 있는 정도였다. 재소성으로 도재 표면기포의 개수와 크기가 유의하게 증가하는 것으로 나타나서, 도재의 구강 외 수리 시에 발생하는 표면 기포를 줄이기 위한 연구가 필요할 것으로 사료된다.

• 구강회복응용과학지
• /
• 제22권2호
• /
• pp.149-159
• /
• 2006

Statement of problem. Porcelain repair mainly involves replacement with composite resin, but the bond strength between composite resin and all-ceramic coping materials has not been studies extensively. Purpose. The objective of this study was to investigate the influence of composite resin and ceramic etching pattern on shear bond strength of Empress2 ceramic and observe the change of microstructure of ceramic according to etching methods. Material and methods. Eighty-five cylinder shape ceramic specimens (diameter 5mm, IPS Empress 2 core materials) embeded by acrylic resin were used for this study. The ceramic were specimens divided into sixteen experimental groups with 5 specimens in each group and were etched with phosphoric acid(37%, 65%) & hydrofluoric acid (4%, 9%) according to different etching times(30s, 60s, 120s 180s). All etched ceramic surfaces were examined morphologically using SEM(scanning electron microscopy). Etched surfaces of ceramic specimens were coated with silane (Monobond-S) & adhesive(Heliobond) and built up composite resin using Teflon mold. Accomplished specimens were tested under shear loading until fracture on universal testing machine at a crosshead speed 1mm/min; the maximum load at fracture(kg) was recorded. Shear bond strength data were analyzed with one way ANOVA and Duncan tests.(P<.05) Results. Maximum shear bond strength was $30.07{\pm}2.41(kg)$ when the ceramic was etched with 4% hydrofluoric acid at 120s. No significant difference was found between phosphoric etchant group and control group with respect to shear bond strength. Conclusion. Empress 2 ceramic surface was not etched by phosphoric acid, but etched by hydrofluoric acid.