• 대한치과의사협회지
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• 제54권5호
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• pp.348-355
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• 2016

Ideal autogenous or allogenic bone graft materials should provide 1) stabilization of blood clot, 2) scaffolds for cellular proliferation and differentiation, 3) release of osteogenic growth factors, 4) appropriate resorption profile for remodeling of new bone. Teeth, especially dentin, mostly contain hydroxyapatite and type I collagen which are similar to bone, and could be valuable graft material. Clinically teeth are used as calcined or demineralized forms. Demineralized form of dentin can be more effective as a graft material. But a conventional decalcification method takes time and long treatment time may give negative effects to various osteogenic proteins in dentin. Author used a new clinical method to prepare autogenous teeth, which could be grafted into the removal defects immediately after extraction using vacuum ultrasonic system. The process could be finished within two hours regardless of the form (powder, chip or block). Teeth were processed to graft materials in block, chip, or powder types immediately after extraction. It took 120 minutes to prepare block types and 40 minutes to prepare powder. Clinical cases did not show any adverse response and the healing was favorable. Rapid preparation of autogenous teeth with the vacuum ultrasonic system could make the immediate one-day extraction and graft possible.

• 구강회복응용과학지
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• 제30권2호
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• pp.121-130
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• 2014

목적: Reciprocating 파일인 WaveOne과 continuous rotary 파일인 ProTaper와 ProFile로 근관 형성시 상아질 벽의 표면성상과 상아질 삭편 크기와 도말층 제거 효과를 비교하였다. 연구 재료 및 방법: 60개 단근치를 ProFile, ProTaper, WaveOne으로 성형 후 근관이 보이도록 grinding 하였다. 근관 성형 동안 상아질 삭편을 모아 건조하였다. Scanning electron microscope으로 상아질 삭편 크기와 근관 표면의 불규칙성과 도말층을 관찰하였다. 결과: 표면 함요부의 범위는 ProFile, ProTaper 그리고 WaveOne에서 $150{\mu}m$, $70{\mu}m$, 그리고 $80{\mu}m$의 범위 내에서 관찰되었다. 상아질 삭편의 크기는 ProFile, ProTaper 그리고 WaveOne에서 $7{\mu}m$, $6.5{\mu}m$, 그리고$4{\mu}m$의 범위 내에서 관찰되었다. 도말층은 WaveOne의 중간 1/3과 근단 1/3에서 유의하게 더 많이 관찰되었다. 결론: WaveOne은 중간 1/3과 치근단 1/3의 도말층 제거 효과를 제외하고, ProFile과 ProTaper와 근관 표면 성상과 상아질 삭편에서 큰 차이가 없는 것으로 사료된다.

• 치과방사선
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• 제29권1호
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• pp.309-325
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• 1999

Purpose: To find out the effects that different tomographic angles have on the osteophytic lesion detectability of condyle head by comparison the individualized lateral tomographic image with the various tomographic angled images using SCANORA/sup (R)/. Materials & Methods: This study is performed to simulate osteophytic lesions by a series of dentin chips placed at six locations on condyle head. The control angle is 15° and from this angle. tomographic angle were varied with -10°, +10°, +20°. All the images with each sized dentin chip were scored by three dental radiologists with the use of confidence levels for presence or absence of the lesion, each examiner viewed one of the images twice. A rating scale from 0 to 2 (0, lesion definitely not present; 1. uncertain if lesion is present; 2, lesion definitely present). Responses were assessed by Tukey' s multiple comparison method and kappa value. Results: 1. The lesion size of 0.3 mm could not be detected in all the tomographic angles. As the size of the lesion increased the average value of lesion detectability also increased. 2. In the lesion sizes of 0.7 mm there was statistically significant difference between the 15° control angle and the altered tomographic angles (p<0.05). In 1.0 mm lesion there was no significant difference in the ±10° altered angles (p >0.05). but there was significant difference in the altered angle (p<0.05). In the lesion sizes of 0.3 mm and 2.0 mm there was no significant difference between the 15° control angle and all the altered angles (p >0.05). 3. In the anteromedial. anterosuperior, anterolateral area there was no significant difference between the 15° control angle and the ±10° altered angle (p >0.05), but in the comparison with the +20° altered angle there was significant difference (p<0.05). Conclusion: When imaging the lateral tomography of the temporomandibular joint used by SCANORA/sup (R)/, it can be considered that in the osteophytic lesion size of 2 mm and above, the tomographic angle difference within +20° to the horizontal angle of the condyle. has little effect on the lesion detectability. And in the lesion size of 1 mm, the altered angle within ±10° also has little effect on the lesion detectability.