• 대한치과의사협회지
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• 제57권7호
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• pp.403-411
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• 2019

A cracked tooth is defined as an incomplete fracture initiated from the crown and extending subgingivally and usually directed mesiodistally. Cracked teeth were most frequently involved in mandibular and maxillary molars at the age of 50s. Cracks occurred mainly in nonbonded restorations such as gold and amalgam, and majority of cracks were found in intact teeth. A pulpal and periapical diagnosis is dependent on the extent of the crack and duration of the symptom. The pulp of a cracked tooth might become inflamed because of microleakage, which induces thermal sensitivity. Once the crack has extended and exposed the pulp, severe pulp and periapical pathosis will likely be present. In addition, the extended crack can cause a bony dehiscence with a resulting narrow and deep periodontal pocket. Therefore, early diagnosis of the cracked tooth and proper treatment planning are important for clinician.

• 대한치과의사협회지
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• 제40권11호통권402호
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• pp.893-898
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• 2002

• 대한치과보철학회지
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• 제59권3호
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• pp.271-280
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• 2021

목적: 본 연구의 목적은 큐레이(Q-ray)와 티스캔(T-scan)을 사용하여 치아균열증후군(cracked tooth syndrome)과 교합 사이의 상관관계를 평가하는 것이다. 대상 및 방법: 2019년 3월 1일부터 2020년 12월 31일까지 아주대학교병원 치과진료센터 치과보철과에 내원한 환자 중 실험대상 포함기준을 만족하며 치아균열증후군으로 진단된 대구치(실험군)를 1개 이상 가지고 있으나 동일 악궁 반대측에는 정상 치아(대조군)를 가진 환자 51명을 대상으로 하였다. 실험군과 대조군 치아의 사진을 Q-ray pen을 이용해 촬영하여 최대형광소실도(ΔF_max)와 최대적색형광도(ΔR_max)을 측정하였고 T-scan 검사를 통해 실험군과 대조군 치아의 상대적 교합강도 및 편심위운동시 이개시간을 측정하였다. Mann-Whitney U test를 통해 실험군과 대조군 사이의 상대적 교합강도와 이개시간의 차이 및 균열치아의 냉검사와 온검사 결과에 따른 군들 간의 최대형광소실도(ΔF_max)와 최대적색형광도(ΔR_max)의 차이를 통계적으로 분석하였다 (α = .05). Spearman correlation analysis를 이용해 최대형광소실도(ΔF_max)와 최대적색형광도(ΔR_max)와 상대적 교합강도 및 이개시간 간의 상관관계를 분석하였다. 결과: 균열치의 상대적 교합강도 및 이개시간은 정상치아에 비하여 통계적으로 유의하게 컸다 (P < .05). 균열치 중 냉검사와 온검사 결과에 따른 각 군들 간의 최대형광소실도(ΔF_max)와 최대적색형광도(ΔR_max)는 통계적으로 유의미한 차이를 보이지 않았다(P > .05). Spearman correlation analysis 결과, 최대형광소실도(ΔF_max)와 최대적색형광도(ΔR_max)와 상대적 교합강도 및 이개시간 간에는 유의미한 상관관계가 없었다 (P > .05). 결론: 본 연구의 결과에 따르면 상대적 교합강도와 이개시간 등의 교합 요소는 치아균열증후군의 발병과 연관이 있었다. Q-ray 검사를 통한 최대형광소실도(ΔF_max)와 최대적색형광도(ΔR_max)의 측정은 치아균열증후군의 진단에는 임상적으로 유용하게 사용될 수 있지만, 임상증상과 정량적인 관계를 입증하지는 못하였다.

• Medical Lasers
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• 제10권4호
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• pp.214-219
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• 2021

Background and Objectives To evaluate the difference in near-infrared (810 nm) laser energy transmission through teeth with and without cracks. Materials and Methods Extracted teeth were sectioned and examined visually for the presence of cracks with the aid of photographs and a trans-illuminator. Fourteen sections, each with cracks (Group A) and no cracks (Group B) were identified and placed 15 mm from the tip of a 300 micron fiber, prior to activation with an 810 nm diode laser (0.1W, 50 ms interval,100 ms duration). A power meter positioned behind the tooth recorded the average energy that was transmitted through the samples. Unpaired t-test analysis was used to determine if the tooth sections with cracks allowed higher power passage compared to sound teeth. Results The mean power recording for the cracked teeth (Group A) was significantly greater (p = 0.0005) than that for the non-cracked teeth (Group B). Conclusion Within the limitations of this study, it is evident that significantly higher laser energy passes through teeth with cracks in comparison to teeth without cracks. A recent clinical study has also shown that lasers could be used to assess symptomatic cracked teeth. Hence, further research is required to determine the relative increase in energy required to identify symptomatic cracked teeth.

• Journal of Periodontal and Implant Science
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• 제47권1호
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• pp.41-50
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• 2017

Purpose: The aims of the present study were to compare the image quality and visibility of tooth cracks between conventional methods and swept-source optical coherence tomography (SS-OCT) and to develop an automatic detection technique for tooth cracks by SS-OCT imaging. Methods: We evaluated SS-OCT with a near-infrared wavelength centered at 1,310 nm over a spectral bandwidth of 100 nm at a rate of 50 kHz as a new diagnostic tool for the detection of tooth cracks. The reliability of the SS-OCT images was verified by comparing the crack lines with those detected using conventional methods. After performing preprocessing of the obtained SS-OCT images to emphasize cracks, an algorithm was developed and verified to detect tooth cracks automatically. Results: The detection capability of SS-OCT was superior or comparable to that of trans-illumination, which did not discriminate among the cracks according to depth. Other conventional methods for the detection of tooth cracks did not sense initial cracks with a width of less than $100{\mu}m$. However, SS-OCT detected cracks of all sizes, ranging from craze lines to split teeth, and the crack lines were automatically detected in images using the Hough transform. Conclusions: We were able to distinguish structural cracks, craze lines, and split lines in tooth cracks using SS-OCT images, and to automatically detect the position of various cracks in the OCT images. Therefore, the detection capability of SS-OCT images provides a useful diagnostic tool for cracked tooth syndrome.

• 대한치과의사협회지
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• 제25권10호통권221호
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• pp.899-899
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• 1987

• Restorative Dentistry and Endodontics
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• 제41권1호
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• pp.79-79
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• 2016

• 대한치과의사협회지
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• 제22권1호통권176호
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• pp.5-5
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• 1984

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2007년도 Spring Scientific Meeting(the 127th) of Korean Academy if Conservative Dentistry
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• pp.287-287
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• 2007

• 한국전기전자재료학회논문지
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• 제29권5호
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• pp.317-320
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• 2016

In order to acquire clear images capable of diagnosing cracked tooth by light transmission, the optical properties of LED light source were examined. Based on the results, the prototype which basically consisted of LED light source, bandpass filter and commercial compact camera module was designed and manufactured. The wavelength and optical power of the LED in the prototype were 850 nm and 7 mW/Sr, respectively. In evaluation of the prototype using microscope, the observation of the crack with width of above $17{\mu}m$ was possible. In addition, image analysis to obtain shape information on the observed tooth cracks was carried out.