50 research outputs found
THE RETRIEVABILITY OF CEMENTATION TYPE IMPLANT ABUTMENT BY SURFACE TREATEMENTS AND TYPES OF CEMENTS
This study was performed to investigate the retrievability of the cementation type implant abutments. The cements used in this study were Cavitec, Tembond and Zinc Phosphate Cement. The types of surface conditioning were no treatment, 50 microne sandblasting, 250 microne sandblasting, fine diamond finishing point and coarse diamond point. The retention of cast crown was measured with Instron Universal Testing Machine(Instron Engineering Co., U.S.A.). The results were as fellows: 1. The Maximium retention was obtained by the group of Z.P.C. cementation and Coarse diamond point surface conditioning. 2. Z.P.C. shows maximum retention, and reduced in orders Tembond, Cavitec, No cement. 3. The value of retention of surface condition was highest in coarse diamond point, lowest in no tretment. 4. The similar results were obtained between fine diamond point and 50 microne sandblasting, coarse diamond point and 250 microne sandblasting. 5. The were no direct corelation between mechanical retention and cementation retention.๋ณธ ์ฐ๊ตฌ๋ ๊ณต์
๊ธฐ๋ฐ์กฐ์ฑ๊ธฐ๊ธ์ ์ฐ๊ตฌ๋น ์ง์๊ณผ ์๋ฏผ์ข
ํฉ์น์ฌ์์ฌ์ ํ๋ฌผ์ ๊ณต์ผ๋ก ์ด๋ฃจ์ด ์ก์ต๋๋ค
์ฑ๊ต์ก ๋ฐ ์ฑ๊ต์ก๊ณผ ๊ด๋ จ๋ ๊ณ ๋ฑํ๊ต ๊ณผํ์์ ์ ๋ํ ๊ณผํ๊ต์ฌ๋ค์ ํ๋์ ์๊ตฌ ์กฐ์ฌ
ํ์๋
ผ๋ฌธ(์์ฌ)--์์ธ๋ํ๊ต ๋ํ์ :๊ณผํ๊ต์ก๊ณผ ์๋ฌผ์ ๊ณต,2002.ํ์๋
ผ๋ฌธ(์์ฌ)-
๋ฐ์ฌ์จ๊ณผ ํฌ๊ณผ์จ ์ธก์ ์ ํตํ ๋ฐ๋ง์ ๊ดํ์ ์์ ๊ฒฐ์ ๊ณผ ์์ฉ
ํ์๋
ผ๋ฌธ(์์ฌ)--์์ธ๋ํ๊ต ๋ํ์ :๊ณผํ๊ต์ก๊ณผ ๋ฌผ๋ฆฌ์ ๊ณต,2001.Maste
(The)Effect of uncertainty concept on the process of measurement and data interpretation in physics inquiry activity
ํ์๋
ผ๋ฌธ(๋ฐ์ฌ)--์์ธ๋ํ๊ต ๋ํ์ :๊ณผํ๊ต์ก๊ณผ ๋ฌผ๋ฆฌ์ ๊ณต,2006.Docto
A study on the complete retrieval system of the cementation type implant abutment
Purpose: This study was peformed to investigate the retrievability of the cemented crown from the cementation type implant abutment.
Material and method: The cementation type implant abutments (NEOBIOTECH implant abutment regular, 3 degree taper, 10mm length, 4mm diameter, Ti grade III, machined surface. Hwasung, Kyunggi-do) and cemented crowns were divided into 3 groups, depending on their hole angles formed in the crowns for their retrievability. The abutments and crowns were luted with 4 kinds of cements and separation test using metal wedge was executed with Instron 4465 Universal Testing Machine and the maximum impact force of the modified crown ejector was measured.
Results and conclusion : 1. All of the cementation type implant abutments and cemented crowns were separated with relatively small force by metal wedge. 2. The retrieving force was minimum when the metal wedge was applied perpendicular to the axis of abutment. 3. The force for retrieving crowns from abutments was maximum in resin cement group, and reduced in orders of zinc phosphate cement, glass ionomer cement and zinc oxide eugenol cement. 4. The maximum force obtained by the crown ejector was higher than the retrieval force in ZOE and GI cement and lower than that in ZPC and resin cement. 5. If it has similar conditions clinically, the cemented crowns luted with 2 types of cements (ZOE, GI cement) can be safely retrieved from the cementation type implant abutments by the modified crown ejector.๋ณธ ์ฐ๊ตฌ๋ ์์ธ๋ํ๊ต ์ ์๊ต์ ์ฐ๊ตฌ ์ ์ฐฉ๊ธ ์ง์์ฌ์
์ฐ๊ตฌ๋น์ ์ํ์ฌ ์ง์๋์์
A STUDY ON THE COMPLETE RETRIEVAL SYSTEM OF THE CEMENTATION TYPE IMPLANT ABUTMENT
Purpose: This study was peformed to investigate the retrievability of the cemented crown from the cementation type implant abutment. Material and method: The cementation type implant abutments (NEOBIOTECH implant abutment regular, 3 degree taper, 10mm length, 4mm diameter, Ti grade III, machined surface. Hwasung, Kyunggi-do) and cemented crowns were divided into 3 groups, depending on their hole angles formed in the crowns for their retrievability. The abutments and crowns were luted with 4 kinds of cements and separation test using metal wedge was executed with Instron 4465 Universal Testing Machine and the maximum impact force of the modified crown ejector was measured. Results and conclusion : 1. All of the cementation type implant abutments and cemented crowns were separated with relatively small force by metal wedge. 2. The retrieving force was minimum when the metal wedge was applied perpendicular to the axis of abutment. 3. The force for retrieving crowns from abutments was maximum in resin cement group, and reduced in orders of zinc phosphate cement, glass ionomer cement and zinc oxide eugenol cement. 4. The maximum force obtained by the crown ejector was higher than the retrieval force in ZOE and GI cement and lower than that in ZPC and resin cement. 5. If it has similar conditions clinically, the cemented crowns luted with 2 types of cements (ZOE, GI cement) can be safely retrieved from the cementation type implant abutments by the modified crown ejector
๊ณต๊ธ์ ์ฃผ๋ ์ฌ๊ณ ๊ด๋ฆฌ ๊ณต๊ธ๋ง์์์ ํ์ง์ ํ ๊ฐ์๋ฅผ ์ํ ์์คํ ์ ์
ํ์๋
ผ๋ฌธ (์์ฌ)-- ์์ธ๋ํ๊ต ๋ํ์ : ์ฐ์
์กฐ์ ๊ณตํ๋ถ ์ฐ์
๊ณตํ ์ ๊ณต, 2013. 2. ๋ฐ์ง์ฐ.๊ณ ๊ฐ ๊ณต์ ์ ์ก์ถ๋ ์ ํ์์ ํ์ง ๋ฌธ์ ๊ฐ ๋ฐ์๋๋ฉด ์ผ๋ฐ์ ์ผ๋ก ์ ํ์ ์ข
๋ฅ ๋ฐ ํน์ฑ์ ๋ฐ๋ผ VMI(Vendor Managed Inventory)์ ๋ณด๊ด์ค์ธ ์ ์ฒด ์ฌ๊ณ ์ ๋ํ์ฌ ๊ฒ์ฌ๋ฅผ ์ค์ํ ํ ์ ์์ผ๋ก ํ์ธ๋ ์ ํ๋ง ๊ณ ๊ฐ ๊ณต์ ์ผ๋ก ๋ค์ ํฌ์
์ด ๋๋ค. ๊ฒ์ฌ ์๋์ ๊ฒฐ์ ์ ํด๋น ๋ถ๋์ ์์ธ ๋ถ์์ ๋ฐ๋ผ ๊ฒฐ์ ์ด ๋์ง๋ง ๊ฒ์ฌ๋ฅผ ์ด์ฉํ์ฌ ๋ฌธ์ ๋ฅผ ํด๊ฒฐํด์ผ ํ๋ ๋์์ ํด๋น ์ ํ๋ง์ผ๋ก ํ์ ํ๊ฑฐ๋ ์ฌํ ๊ฒฝ์ฐ VMI์ ๋ณด๊ด์ค์ธ ์ ์ฒด ์ฌ๊ณ ๋ก ํ๋๋๊ธฐ๋ ํ๋ค.
๊ธฐ์กด ์ฐ๊ตฌ์์๋ ์ด์์ ์ธ ์ํ๋ง ๊ฒ์ฌ ๋ฐฉ๋ฒ์ ์ ์ํ๊ฑฐ๋ ๋น์ฉ ๋ฐ ์๊ฐ์ ๊ณ ๋ คํ์ฌ ํผํด๋ฅผ ์ต์ํํ๋ ๋ชจํ์ ์ฃผ๋ก ์ ์ํ์๋ค. ํ์ง๋ง ๋ณธ ์ฐ๊ตฌ๋ ๋ถ๋์ ์ ํ์ ๋ฐ๋ผ ๋ถ๋ ๋ฐ์ ๋ฉ์ปค๋์ฆ์ ์ ์ํ์ฌ ์ด์ ๋ฐ๋ฅธ ์ํ๋ง ๊ฒ์ฌ ๋ฐฉ์์ ๊ณ ๋ คํ์๋ค. ๋ถ๋ ๊ณ ๋ ค ์ ์์ธ, ์๊ฐ ๋ฐ ์์ญ๊ด์ ์์ ์ ๊ทผ์ ํ์์ผ๋ฉฐ ๋กํธ๋ณ ํ์ง ์ ๋ณด๋ฅผ ๊ตฌ์ถํ์ฌ ํ์ฉํ๋ ๋ฐฉ์๋ ์ ์ํ์๋ค.
๋ณธ ์ฐ๊ตฌ์์๋ ํ์ง์ ํ๋ฅผ ๊ฐ์ํ๊ณ ๊ฒ์ฌ ๋น์ฉ์ ์ต์ํ ํ ์ ์๋ ๋ฌธ์ ๋ฅผ ํ๊ธฐ ์ํด ์ํฉ๋ณ ์๋ฎฌ๋ ์ด์
์ ํตํ์ฌ ์ต์ ์ ์กฐ๊ฑด์ ๋์ถํ์๋ค. ์ฐ๊ตฌ ๋ด์ฉ์ ์ ํ์ ๋กํธ๊ฐ VMI์ ์
๊ณ ๋๋ฉด ํ๋ฅ ์ ๊ธฐ๋ฐ์ผ๋ก ํ ์ฌ์ ์ํ๋ง ๊ฒ์ฌ๋ฅผ ์ค์ํ๊ณ , ํ์ง ์์ค์ด ๋ฎ์ ๋กํธ์ ๋ํด์๋ ๋ถ๋ ๋ฉ์ปค๋์ฆ ๊ตฌ๋ถ ํ ์ถ๊ฐ ๊ฒ์ฌ ๋ฐ ์ง์ ๋ ์กฐ์น๋ฅผ ์ํํจ์ผ๋ก์จ ๊ณ ๊ฐ ๊ณต์ ์์ ํ์ง ๋ฌธ์ ๋ฐ์์ ๊ฐ์ํ๊ณ ๋น์ฉ์ ์ ๊ฐํ๋๋ฐ ๊ธฐ์ฌํ ๊ฒ์ผ๋ก ์์๋๋ค.๋ชฉ ์ฐจ
์ 1 ์ฅ ์ ๋ก 1
์ 1 ์ ์ฐ๊ตฌ ๋ฐฐ๊ฒฝ ๋ฐ ๋ชฉ์ 1
์ 2 ์ ์ฐ๊ตฌ ๋ด์ฉ ๋ฐ ๋ฐฉ๋ฒ 3
์ 3 ์ ๋
ผ๋ฌธ ๊ตฌ์ฑ 4
์ 2 ์ฅ ๋ฐฐ๊ฒฝ ์ด๋ก ๋ฐ ๊ด๋ จ ์ฐ๊ตฌ 5
์ 1 ์ VMI ๋ฐฉ์ ๊ณต๊ธ๋ง ํน์ฑ 5
2. 1. 1. VMI ์์คํ
์ ์ ์ 5
2. 1. 2. ์ ํ์ ๋ณด๊ด ๋ฐ ์ธ๋ 6
2. 1. 3. ์ ํ์ ํ์ง์ ํ 7
์ 2 ์ ํ์ง๊ด๋ฆฌ ๋ฐ ๊ฒ์ฌ 8
2. 2. 1. ํ์ง๊ด๋ฆฌ ๋ฐ ํ์ง๋ณด์ฆ 8
2. 2. 2. ์ ํ๊ฒ์ฌ 9
์ 3 ์ ์ํ๋ง ๊ฒ์ฌ 11
2. 3. 1. ์ํ๋ง ๋ฐฉ๋ฒ ์ ์ 11
2. 3. 2. ํ๋ณธ ์ถ์ถ ๊ฒ์ 13
2. 3. 3. ๊ฒ์ฌ ํน์ฑ ๊ณก์ 14
2. 3. 4. VMI ์ฌ๊ณ ๊ฒ์ฌ ํํฉ ๋ฐ ๋ฌธ์ ์ 17
์ 4 ์ ์ ํ ์ฐ๊ตฌ์ ๊ฒํ 18
์ 3 ์ฅ ๋ฌธ์ ์ ์ 20
์ 1 ์ ๋ถ๋๋ฐ์ ๋ฉ์ปค๋์ฆ ๋ฐ ํ์งํน์ฑ 20
3. 1. 1. ์ ํ ๋ถ๋ ํน์ฑ 21
3. 1. 2. ๋ถ๋ ๋ฐ์ ๋ฉ์ปค๋์ฆ 24
3. 1. 3. ํ์งํน์ฑ 26
์ 2 ์ ๋กํธ ์ ๋ณด๊ด๋ฆฌ ํ๋ ์์ํฌ 27
3. 2. 1. ๋กํธ ํ์ง ๋งคํธ๋ฆญ์ค ๊ตฌ์ถ 27
3. 2. 2. ๋กํธ ์จ์ต๋ ๊ด๋ฆฌ ํ๋ ์์ํฌ 29
์ 3 ์ ์ผ๋ฐ์ ์ธ ์ ํ ๊ฒ์ฌ ํ๋ก์ธ์ค 31
์ 4 ์ ์๋ฆฌ๋ชจํ ๊ตฌ์ถ 34
์ 5 ์ ์ฌ์ ํ์ง ์ํ๋ง ๊ฒ์ฌ ํ๋ก์ธ์ค 40
์ 4 ์ฅ ์๋ฎฌ๋ ์ด์
43
์ 1 ์ ๋ถ์ ์๋๋ฆฌ์ค 43
4. 1. 1. ์๋๋ฆฌ์ค ์ ์ 43
4. 1. 2. ์๋ฎฌ๋ ์ด์
ํ๋ผ๋ฏธํฐ ์ค๋ช
44
์ 2 ์ ์๋ฎฌ๋ ์ด์
๊ฒฐ๊ณผ 47
์ 5 ์ฅ ๊ฒฐ๋ก 55
Appendices 58
์ฐธ๊ณ ๋ฌธํ 60
Abstract 64Maste
THREE DIMENSIONAL FINITE ELEMENT ANALYSIS OF INTERNALLY CONNECTED IMPLANT SYSTEMS
Statement of problem: Currently, there are some 20 different geometric variations in implant/abutment interface available. The geometry is important because it is one of the primary determinants of joint strength, joint stability, locational and rotational stability. Purpose: As the effects of the various implant-abutment connections and the prosthesis height variation on stress distribution are not yet examined this study is to focus on the different types of implant-abutment connection and the prosthesis height using three dimensional finite element analysis. Material and method. The models were constructed with ITI, 3i TG, Bicon, Frialit-2 fixtures and solid abutment, TG post, Bicon post, EstheticBase abutment respectively. And the super structures were constructed as mandibular second premolar shapes with 8.5 mm, 11 mm, 13.5 mm of crown height. In each model, 244 N of vertical load and 244 N of oblique load were placed on the central pit of an occlusal surface. von Mises stresses were recorded and compared in the crowns, abutments, fixtures. Results: 1. Under the oblique loading, von Mises stresses were larger in the crown, abutment, fixture compared to the vertical loading condition. 2. The stresses were increased proportionally to the crown height under oblique loading but showed little differences with three different crown heights under vertical loading. 3. In the crown, the highest stress areas were loading points under vertical loading, and the finish lines under oblique loading. 4. Under the oblique loading, the higher stresses were located in the fixture/abutment interface of the Bicon and Frialit-2 systems compared to the ITI and TG systems. Conclusions: The stress distribution patterns of each implant-abutment system had difference among them and adequate crown height/implant ratio was important to reduce the stresses around the implants
A studyontheChangeoftheRoleofU.S.Tactical NuclearWeaponsintheKoreanPeninsulaaccordingto U.S.CognitionofThreatsinNorth-EastAsia
Vibrotactile Score for Designing Vibrotactile Patterns
MasterDespite the plethora of available vibrotactile applications that have already begun to impact our everyday life, how to design vibrotactile patterns easily and efficiently continues to be a challenge. As an intuitive and effective approach for vibrotactile pattern design, this paper proposes a vibrotactile score. The term comes from a metaphor of a musical score and its design is adapted from two common musical scores (piano score and guitar tablature). Another metaphorical feature analogous to the musical clef, named a vibrotactile clef, is also introduced to decouple the processes of low-level vibrotactile signal design and high-level pattern composition. The conceptual design of the vibrotactile score and clef are fully realized in a graphical authoring tool named the Vibrotactile Score Editor (VibScoreEditor). We demonstrate the expressiveness of the vibrotactile score with several examples. In addition, the usability of the vibrotactile score was evaluated, focusing on its learnability, efficiency, and user preference. Experiment 1 was to compare the vibrotactile score and the current dominant practices of vibrotactile pattern implementation including programming and scripting. The results gained from programming experts validated the substantially superior performance of the vibrotactile score. Experiment 2 was to compare the vibrotactile score with the waveform-based design already implemented in a few recent graphical authoring tools for vibrotactile patterns. Ordinary users without programming backgrounds participated in this experiment, and the results substantiated the excellent performance of the vibrotactile score.์ต๊ทผ ์ง๋ ํผ๋๋ฐฑ์ด ๋ค์ํ ๋ถ์ผ์์ ํ์ฉ๋๊ณ ์์ง๋ง, ์ฝ๊ณ ํจ์จ์ ์ผ๋ก ์ง๋ ํจํด์ ๋์์ธํ๋ ๋ฐฉ๋ฒ์ ๊ดํ ์ฐ๊ตฌ๋ ์์ง ๋ง์ด ์ด๋ฃจ์ด์ง์ง ์์๋ค. ๋ณธ ๋
ผ๋ฌธ์ ์๊ณผ ์ง๋์ ์ ์ฌ์ฑ์ ์ฐฉ์ํ์ฌ ํผ์๋
ธ ์
๋ณด์ ๊ธฐํ ํ๋ธ ์
๋ณด์ ํํ ๋ฐฉ๋ฒ์ ์ฌ์ฉํด ์ง๋์ ๋์์ธํ๋ ๋ฐฉ๋ฒ์ ์ ์ํ๋ค. ์ง๋ ์
๋ณด์ ์ง๋ ์์๋ฆฌํ๋ผ๋ ๋ ๊ฐ์ง ์์
์ ๋ฉํํฌ๋ฅผ ์ฌ์ฉํด ๋์ ์์ค์ ์ง๋ ํจํด๊ณผ ๋ฎ์ ์์ค์ ์ง๋ ์ ํธ๋ฅผ ๋ถ๋ฆฌํด์ ์ ์ํ์ฌ ๋์ ํธ์์ฑ๊ณผ ํ์ฅ์ฑ, ๋ค์์ฑ์ ๋ณด์ฅํ ์ ์๊ฒ ํ์๋ค. ๋ํ, ์ง๋ ์
๋ณด์ ์์๋ฆฌํ์ ๊ฐ๋
์ ์ค์ ๊ตฌํํ ์ง๋ ํจํด ์ ์ ๋๊ตฌ๋ฅผ ์ ์ํ์์ผ๋ฉฐ, ์ด๋ฅผ VibScoreEditor๋ผ๊ณ ํ์๋ค. ๋ช ๊ฐ์ง ์ค์ง์ ์ธ ์ง๋ ํจํด ์ ์ ์๋ฅผ ํตํด ์ง๋ ์
๋ณด์ ํํ๋ ฅ์ ํ์ธํ์๋ค. ์ง๋ ์
๋ณด์ ์ฅ์ ์ ๊ฒ์ฆํ๊ธฐ ์ํด, ํ์ต ๋ฐ ์ฌ์ฉ ์ฉ์ด์ฑ, ์ง๊ด์ฑ, ํจ์จ์ฑ, ์ ํธ๋ ์ค์ฌ์ผ๋ก ์ฌ์ฉ์ ํ๊ฐ ์คํ์ ์ํํ์๋ค. ์ฒซ๋ฒ์งธ ์คํ์ ํ๋ก๊ทธ๋๋ฐ์ ๋ฅ์ํ ์ ๋ฌธ๊ฐ ๊ทธ๋ฃน์ ๋์์ผ๋ก ํ์ฌ ์ด๋ค์ก์ผ๋ฉฐ, VibScoreEditor๋ฅผ ํตํด ์ง๋ ์
๋ณด๋ฅผ ํธ์งํ๋ ๋ฐฉ์์ด ํ๋ก๊ทธ๋๋ฐ์ด๋ ์คํฌ๋ฆฝํ
๊ฐ์ ๊ธฐ์กด์ ๋ฐฉ๋ฒ๋ณด๋ค ํจ์ฌ ๋ ๋์ ๊ฒ์ ํ์ธํ์๋ค. ๋๋ฒ์งธ ์คํ์์๋ ์ผ๋ฐ ์ฌ์ฉ์๋ค์ ๋์์ผ๋ก ํํ ์กฐ์ ๋ฐฉ์๊ณผ ์
๋ณด ํธ์ง ๋ฐฉ์์ ๋ ๊ฐ์ง ์ง๋ ์ ์ ๋ฐฉ์์ ๋น๊ตํ๊ฒ ํ์ฌ, ์
๋ณด ํธ์ง ๋ฐฉ์์ด ํํ ์กฐ์ ๋ฐฉ์๋ณด๋ค ๋ ์ฐ์ํ ๊ฒ์ ํ์ธํ์๋ค