• 제목/요약/키워드: Acrylic resin teeth

검색결과 95건 처리시간 0.023초

반복하중하에서의 carbon fiber post의 파절강도에 관한 연구 (A STUDY ON THE FRACTURE STRENGTH OF TEETH RESTORED WITH A CARBON FIBER POST UNDER CYCLIC LOADING)

  • 이양진
    • 대한치과보철학회지
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    • 제38권5호
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    • pp.640-649
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    • 2000
  • In the restoration of endodontically treated teeth, carbon fiber post was recently introduced. The purpose of this in vitro study was to investigate the fracture strength of teeth restored with a pre-fabricated carbon fiber post in comparison with teeth restored with a prefabricated titanium post & custom cast gold post after cyclic loading in the different environment. A total of 30 recently extracted human central incisors of similar dimension with crowns removed were used. All teeth were placed into acrylic blocks and every steps for post and core fabrication were made accord-ing to manufacture's instruction. The post length and core dimensions were standardizd. All teeth were divided into 6 groups: 1) carbon fiber post / atmosphere, 2) titanium post / atmosphere, 3) gold post / atmosphere, 4) carbon fiber post / wet, 5) titanium post / wet, 6) gold post / wet. Carbon fiber post and titanium post were cemented in place using resin cement and cores were fabricated with Ti-Core. Custom cast gold post was made from Duralay pattern resin and cemented using resin cement, too. All specimens were thermocycled 10,000 times. After 50,000 cyclic loading, failure strength was measured using Instron testing machine. Kruskal-Wallis test followed by Mann-Whitney test was used to compare the mean fracture strength. Results were as follows : 1. All specimens showed lower fracture strength in wet environment after cyclic loading than in atmosphere condition, but did not reveal a significant difference. 2. There was no significant difference between carbon fiber post specimen and titanium post specimen in the same environment. 3. Gold cast post specimen showed significant different greater fracture strength than those of others in the same environment. 4. Carbon fiber post specimen showed no root fracture.

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응축형 복합레진 수복시 유동성 레진 이장이 변연부 미세누출에 미치는 영향 (THE EFFECT OF FLOWABLE RESIN LINING ON THE MARGINAL MICROLEAKAGE OF CONDENSABLE RESIN RESTORATION)

  • 문주훈;고근호
    • Restorative Dentistry and Endodontics
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    • 제26권1호
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    • pp.16-22
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    • 2001
  • The purpose of this study was to evaluate the marginal microleakage of condensable composite resin restorations according to flowable resin lining of internal cavity wall. The eighty extracted human molar teeth without caries and/or restorations are used The experimental teeth were randomly assigned into four groups of ten teeth each. Eighty caries-free extracted human molars were used in this study. The conventional class II cavities (box-shaped on mesial and distal surface, faciolingual width : 3mm, gingival wall depth : 1.5mm) were prepared 1mm below cementoenamel junction with a # 701 carbide bur. The teeth were divided into four groups, and then each group were subdivided into A & B group according to flowable resin & compomer lining ; Group 1-A : Tetric Ceram filling, Group 1-B : Tetric Flow lining and Tetric Ceram filling, Group 2-A Ariston pHc filling, Group 2-B : Tetric Flow lining and Ariston pHc filing, Group 3-A SureFil filling, Group 3-B : Dyract Flow lining and SureFil filling, Group 4-A : Pyramid filling, Group 4-B : Aeliteflo lining and Pyramid filling. To simulate as closely as possible the clinical situation during retoration placement, a "restoration template" was fabricated, and the condensable resin was filled using a three-sited light-curing incremental technique. All the materials used were applied according to the manufacturers' instructions. The specimens were stored in the 100% humidity for 7 days prior to thermocycling (100 thermal cycles of 5~55$^{\circ}C$ water with a 30-second dwell time) The specimens were immersed in 2% metyleneblue dye for 24 hours, and then embedded in transparent acrylic resin and sectioned mesiodistally with diamond wheel saw. The degree of marginal leakage was scored under stereomicroscope ($\times$20) and the data were analyzed by Kruskal-Wallis test and Wilcoxon signed ranks test. The results were as follows : 1. In the gingival margins of all the group, microleakage of subgroup B was less than subgroup A. 2. In the group 1, 2, 4, there was significant differences between subgroup A and B (p<0.05), but in the group 3, there was not significant different between group 3-A (SureFil) and group 3-B (Dyract flow/SureFil) (p>0.05). 3. In the subgroup A and B, there was significant different between all group except group 4 of subgroup A. From the results above, it was suggested that the cavity lining of flowable resin and flowable compomer in condensable resin restoration decrease microleakage at gingival margin, and does improve their ability to seal the gingival margin of class II preparation.

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김해 대성동 88호분 출토 골제 빗 모양 장신구의 보존처리 (Conservation Treatment of Comb-shaped Bone Jewelry from Daeseong-dong Tomb No.88, Gimhae)

  • 김미도리;최지애
    • 박물관보존과학
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    • 제16권
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    • pp.114-121
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    • 2015
  • 김해 대성동 88호분에서 두 점의 빗 모양 장신구가 출토되었다. 에탄올과 여러 소도구를 사용하여 유물 표면의 이물질을 제거하였고, 셀룰로오스 계통 합성수지와 에폭시 수지로 접합, 복원하였다. 복원된 부분은 아크릴 물감으로 색맞춤하여 보존처리를 완료하였다. 두 점의 빗 모양 장신구는 빗살의 개수와 두께에서 차이가 있지만 제작방법은 동일하다. 동물의 척골로 추정되는 뼈를 다듬어 양 끝의 지지대로 놓았고, 그 사이에 뼈로 만든 빗살을 배치한 뒤, 견사로 여러 번 묶고 옻칠하여 살을 고정하였다.

보철물 조건에 따른 Periotest수치의 실험적 평가 (IN VITRO EVALUATION OF PERIOTEST VALUES UNDER VARIOUS CONDITIONS OF PROSTHESES)

  • 한중석
    • 대한치과보철학회지
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    • 제35권4호
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    • pp.793-800
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    • 1997
  • Periotest(Siemens, Germany) has been used to test mobility of the implants clinically, however the effects of target materials and connection methods on the PTVs(Periotest Values) have not been evaluated. Periotest has been regarded as a reliable and objective tool to test implant and natural teeth mobility clinically, however this instrument showed different PTVs under various test conditions. This in vitro study was designed to compare PTVs of different veneering materials and prosthodontic designs (single and bridge restorations). To compare the effects of veneering materials on PTVs, 1 mm thickness of five different testing materials (porcelain, type III gold alloy, pure titanium, composite resin, acrylic resin) were placed on the resin block. Three full length of 13 mm Mark II implant fixtures were embedded into autopolymerizing resin block to fabricate single and bridge restorations. To evaluate effects of the connection method in single restorations, PTVs of screw retained(UCLA type) and cementation type(Cera-One system) were compared. Finally, to test reliability of PTVs of the final restorations, screw retained three unit short span PFM bridges were fabricated on the standard and Estheti-Cone abutments. All testing components were tightened with torque controller and PTVs of all specimens were measured 15 times for statistical analysis with SAS program. Following conclusions were made within the limit of this in vitro study. 1. PTVs of type III gold alloy, grade II titanium, composite resin veneering materials showed no significant differences, however acrylic resin and porcelain showed significant differences (P<0.05). 2. Single tooth restorations showed consistent PTVs as long as proper torque force was applied. 3. PTVs of bridge type prostheses was inconsistent regardless of abutment types. 4. PTVs of the prostheses showed higher scores and standard deviations than those of abutments regardless types of connection (P<0.05).

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The effect of various commercially available bleaching agents on the microshear bond strength of composite resin to enamel

  • Chang, Hoon-Sang;Cho, Kyung-Mo;Kim, Jin-Woo
    • Restorative Dentistry and Endodontics
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    • 제29권3호
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    • pp.219-225
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    • 2004
  • This study evaluated the microshear bond strength of composte resin to teeth bleached with commercial whitening strips and compared with those bleached with home bleaching gel. Twelve extracted human central incisors were cut into pieces and central four segments were chosen from each tooth and embedded in acrylic resin. Four blocks with 12 tooth segments embedded in acrylic resin were acquired and numbered from group one to group four. Group 1 was bleached with Crest Whitestrips, group 2 with Claren, group 3 with Opalescence tooth whitening gel (10% carbamide peroxide). Group 4 was used as control. The bleaching procedure was conducted for 14 days according to the manufacturer's instructions ; the bleaching strips twice a day for 30 min and the bleaching gel once a day for 2hr. After bleaching, composite resin (Filtek Supreme) was bonded to the enamel surfaces with a self-etching adhesive (Adper Prompt L-Pop) using Tygon tube. Microshear bond strength was tested with a universal testing machine (EZ-test). The data were statistically analysed by one-way ANOVA. The study resulted in no statistical differences in microshear bond strength between the tooth segments bleached with 2 different whitening strips and bleaching gel. It can be concluded that the effect of bleaching with either commercial whitening strips or bleaching gel on enamel is minimal in bonding with self-etching adhesive to composite resin.

치아재식술의 일례 (A case Report of Tooth Replantation)

  • 최상열;박광진;이태원;조종만;성백균;최구영
    • 대한치과의사협회지
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    • 제11권4호
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    • pp.287-291
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    • 1973
  • A case report of replantation of extracted teeth. A 11-year-old female child patient whose right and left 1st premolars were dislocated by accident, which was treated by means of tooth replantation and obtained the following results. 1) In childhood whose development and growth were prominent prognosis were excellent. 2) The better results were drew by tooth fixation with acrylic resin after ligature the teeth with wire. 3) To treat the tooth replantation combination with canal treatment brings on the good results. 4) We can maintain the natural teeth, which could get the same function as before. According to previous results, the technique can be usd clinically.

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Functional and aesthetic rehabilitation in posterior tooth with bulk-fill resin composite and occlusal matrix

  • Francisconi-dos-Rios, Luciana Favaro;Tavares, Johnny Alexandre Oliveira;Oliveira, Luanderson;Moreira, Jefferson Chaves;Nahsan, Flavia Pardo Salata
    • Restorative Dentistry and Endodontics
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    • 제45권1호
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    • pp.9.1-9.7
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    • 2020
  • The restorative procedure in posterior teeth involves clinical steps related to professional skill, especially when using the incremental technique, which may fail in the long term. A recent alternative is bulk-fill resins, which can reduce polymerization shrinkage, decreasing clinical problems such as marginal leakage, secondary caries, and fracture. This scientific study aims to report a clinical case using bulk-fill resin with an occlusal matrix. As determined in the treatment plan, an acrylic resin matrix was produced to establish an improved oral and aesthetic rehabilitation of the right mandibular first molar, which presented a carious lesion with dentin involvement. The occlusal matrix is a simple technique that maintains the original dental anatomy, showing satisfactory results regarding function and aesthetic rehabilitation.

Brånemark 골유착성 매식체의 금관 수복재료에 따른 지지조직의 응력분석 (The stress analysis of supporting tissues according to crown restorative materials in Brånemark osseointegrated implant)

  • 정관호;배태성;송광엽;박찬운
    • 대한치과보철학회지
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    • 제28권2호
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    • pp.199-215
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    • 1990
  • This study was to analyze the stress distribution of implant and supporting tissue in $Br{\aa}nemark$ osseointegration implant. The analysis has been conducted by using the axisymmetric finite element method and type of model according to crown material. Tests have been performed at 1 kg load on central fossa of crown portion. Each type of model was designed differently according to crown material. 1) Porcelain fused to metal crown(Model A) 2) Composite resin veneered crown(Model B) 3) Acrylic resin veneered crown(Model C) 4) Type III gold crown(Model D) The displacements and stresses of implant and supporting structures were analyzed to investigate the influence of the type of crown material. The results were obtained as follows : 1. Displacement of implant was shown uniformly downward displacement in all models and abutments were observed distally downward displacement. 2. In supporting tissues, stress was concentrated on the crest of compact bone and the spongy bone below implant. 3. The PFM and the type III gold crown showed the largest concentration of stress at the crest of compact bone and the spongy bone below implant, respectively. Acrylic resin artificial teeth and composite resin veneered crown indicated almost the same distribution of stress. 4. The gold screw, the abutment screw and the top of abutment showed the concentration of stress in implants of every model.

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수종의 인공 레진 치아의 마모저항성과 경도에 관한 비교 연구 (Comparative Study on Wear Resistance and Hardness of Several Artificial Resin Teeth)

  • 최유성;이준석;조인호
    • 구강회복응용과학지
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    • 제24권2호
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    • pp.129-146
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    • 2008
  • 본 연구에서는 다양한 치과 수복재료에 대합되는 의치용 레진치의 마모저항성을 알아보기 위해 통상의 아크릴 릭 레진치인 $Trubyte^{(R)}$ $Biotone^{(R)}$ (Dentsply, U.S.A.)과 고강도 레진치인 Endura $Posterio^{(R)}$ (Shofu, Japan), Physio $Duracross^{(R)}$ (Nissin, Japan)를 수복재료인 금합금, 도재, 충전용 레진에 대합시켜 마모저항성을 비교 분석하였다. 또한 앞의 세 종류의 레진 인공치와 5종류의 의치세정제인 유한락스, 폴리덴트, 싸이덱스, 헥사메딘, 증류수를 사용하여 의치세정제 및 소독제가 경도에 미치는 영향을 비교 분석하여 다음과 같은 결과를 얻었다. 1. 대합되는 수복재료로 충전용 레진, 도재를 사용한 경우 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 교두정 높이감소가 컸으며 세 재료간의 유의한 차이를 보였다 (p<0.05). 2. 대합되는 수복재료로 금합금을 사용한 경우 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 교두정 높이 감소가 컸으며, 특히 $Trubyte^{(R)}$ $Biotone^{(R)}$ 이 다른 두 종류의 인공치보다 유의성 있게 높은 교두정 높이 감소를 보였다 (p<0.05). 3. 대합되는 수복재료로 충전용 레진, 금합금, 도재를 사용한 경우 모두 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 무게 감소가 컸으며, 세 재료간의 유의한 차이를 보였다 (p<0.05). 4. 의치세정제에 따른 경도 감소는 실험 전과 후의 측정치를 비교했을 때 모든 레진 인공치에서 유의성 있는 차이 를 나타내었다 (p<0.05). 5. 유한락스, 싸이덱스, 헥사메딘에 담구었던 레진 인공치에 의한 경도감소는 $Trubyte^{(R)}$ $Biotone^{(R)}$, Endura $Posterio^{(R)}$, Physio $Duracross^{(R)}$ 순으로 높은 감소를 보였고, 특히 $Trubyte^{(R)}$ $Biotone^{(R)}$이 다른 두 종류의 인공치보다 유의성 있게 높은 경도 감소를 보였다 (p<0.05). 이상의 실험 결과 마모저항성 실험에서는 최근에 개발된 Physio $Duracross^{(R)}$가 다른 두 종류의 레진 인공치에 비해 세 종류의 대합되는 수복재료 모두에서 높은 마모저항성을 보였고 특히 $Trubyte^{(R)}$ $Biotone^{(R)}$에 비해 유의성 있게 높은 마모저항성을 보였다. 경도 실험에서는 Physio $Duracross^{(R)}$와 Endura $Posterio^{(R)}$$Trubyte^{(R)}$ $Biotone^{(R)}$에 비해 유의성 있게 낮은 경도감소를 보였고 (p<0.05), 폴리덴트, 증류수에서는 유의한 차이를 보이지 않았다. 따라서, Physio $Duracross^{(R)}$가 세 종류의 레진 인공치에 비해 우수한 마모저항성을 보인다고 볼 수 있고, Endura $Posterio^{(R)}$와 함께 $Trubyte^{(R)}$ $Biotone^{(R)}$에 비해서 우수한 경도를 보인다고 볼 수 있지만, 단편적인 실험 결과이므로, 아직은 신중하게 고려되어야 하고, 더 많은 연구가 필요하다고 사료된다.

상아질에 대한 자가 접착 레진 시멘트의 전단결합강도에 관한 연구 (The study of shear bond strength of a self-adhesive resin luting cement to dentin)

  • 인희선;박종일;최종인;조혜원;동진근
    • 대한치과보철학회지
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    • 제46권5호
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    • pp.535-543
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    • 2008
  • 최근의 레진 접착시스템은 단계를 줄이고 적용과정을 간편화시키는데 주력하고 있으며, 치면에 bonding 및 conditioning 과정 없이 바로 적용 가능한, one-step의 새로운 자가 접착 레진시멘트 (self-adhesive resin luting cement)들이 소개되어 임상에 사용되고 있다. 이에 본 연구의 목적은 자가 접착 레진시멘트와 기존의 레진시멘트의 상아질에 대한 전단 결합 강도를 비교해보고, 자가 접착 레진시멘트 적용시 치면의 식각 처리 여부가 전단 결합 강도에 미치는 영향에 관하여 알아보고자 하는 것이다. 본 연구를 위해 최근 6개월 내 발치된 비교적 건전한 성인의 대구치 45개를 아크릴릭 레진으로 매몰한 다음, 800 grit SiC연마지로 연마를 시행하여 상아질을 노출시켰다. 15개의 치아를 한 군으로 하여, 세 가지 실험군으로 분류하였다. Group 1) 치면에 아무런 전처리 없이 RelyX Unicem 접착. Group 2) 치면에 인산 산부식 처리 후, RelyX Unicem 접착, Group 3) 치면에 Syntac primet + Syntac adhesive + Heliobond 처리 후 Variolink II 접착. 전처리가 완료된 치아 시편 위에 플라스틱 튜브 (직경 3 mm, 높이 3 mm)를 고정한 다음, 제조사의 지시에 따라 각 레진 시멘트를 혼합하여 링 안을 채우고, 광중합을 시행하였다. 접착이 완료된 시편은 $37^{\circ}C$ 항온수조 (증류수)에서 24시간 동안 보관 후, 만능 시험기를 이용하여 1mm/min의 cross head speed로 결합강도를 측정하였으며, 확대경 하에서 파절 양상을 분류 관찰하고, 주사전자현미경을 이용하여 미세구조를 관찰하였다. 측정결과는 SPSS WIN 12.0 프로그램을 사용하여 분석하였으며 다음과 같은 결과를 얻었다. 1. RelyX Unicem의 상아질에 대한 전단결합강도는 Variolink II와 유의한 차이를 보이지 않았다. 2. 상아질에 대한 인산 산부식 처리는 RelyX Unicem과의 전단결합강도를 낮게 하였다. 3. RelyX Unicem과 Variolink II에서는 혼합 파절의 비율이 컸으며, 전단결합강도가 낮았던 인산 산부식 처리 후 RelyX Unicem을 접착한 경우에서는 전체 시편에서 접착성 파절이 관찰되었다. 결론으로 말하면, 자가 접착 레진시멘트와 기존의 레진시멘트의 상아질에 대한 전단결합강도는 유의한 차이를 보이지 않으며, 인산 산부식 처리는 상아질에 대한 자가 접착 레진시멘트의 전단결합강도를 감소시킨다.