프랙탈 분석을 이용한 치근단병소 치유과정의 골 변화 = Bony change of apical lesion healing process using fractal analysis

다국어 초록 (Multilingual Abstract)

Purpose : To investigate the change of bone healing process after endodontic treatment of the tooth with an apical lesion by fractal analysis.
Materials and Methods : Radiographic images of 35 teeth from 33 patients taken on first diagnosis, 6 months, and 1 year after endodontic treatment were selected. Radiographic images were taken by JUPITER Computerized Dental X-ray System. Fractal dimensions were calculated three times at each area by Scion Image PC program. Rectangular region of interest (30×30) were selected at apical lesion and normal apex of each image.
Results : The fractal dimension at apical lesion of first diagnosis (L_(0)) is 0.940±0.361 and that of normal area (N_(0)) is 1.186±0.727 (p＜0.05). Fractal dimension at apical lesion of 6 months after endodontic treatment (L₂) is 1.076± 0.069 and that of normal area (N₁) is 1.192±0.055 (p＜0.05). Fractal dimension at apical lesion of 1 year after endodontic treatment (L₂) is 1.163±0.074 and that of normal area (N₂) is 1.225 0.079 (p＜0.05). After endodontic treatment, the fractal dimensions at each apical lesions depending on time showed statistically significant difference. And there are statistically significant different between normal area and apical lesion on first diagnosis, 6 months after, 1 year after. But the differences were grow smaller as time flows.
Conclusion : The evaluation of the prognosis after the endodontic treatment of the apical lesion was estimated by bone regeneration in apical region. Fractal analysis was attempted to overcome the limit of subjective reading, and as a result the change of the bone during the healing process was able to be detected objectively and quantitatively.

참고문헌 (Reference)

1 "치주질환 진단시 프랙탈 분석의 유용성에관한 연구" 31 : 35-42, 2001

2 "디지털 공제술에서 비표준화 방사선사진의 대조도 및 기하학적 보정에 관한 연구" 28 : 797-809, 1998

3 "근관치료에 관한 방사선학적 연구" 15 : 41-9, 1985

4 "Use of the fractal dimension to describe the trabecular pattern of osteoporosis"

5 "The use of fractal geometry to quantitative bone structure from radiography"

6 "The use of fractal analysis to reveal remodeling in humanalveolar bone following the placement of dental implant" 40 : 61-72, 1995

7 "The fractal geometry of nature" 1983

8 "The effect of varying the region of interest on calculations of fractal index" 26 : 295-8, 1997

9 "The effect of image variations on fractal dimension calculations" 84 : 96-100, 1997

10 "Television radiographic evaluation of periapical osseous radiolucencies" 41 : 789-96, 1976

11 "Roentgenographic and direct observation of experimental lesion of bone I" 62 : 152-60, 1961

12 "Radiography of the periapical region as a diagnostic aid Diagnosis of marginal changes" 25-47,

13 "Radiographic videodensitometry for quantitative monitoring of experimental bone healing" 62 : 883-9, 1989

14 "Physiology in fractal dimensions" 75 : 354-65, 1987

15 "Multifractal radiographic analysis of osteoporosis" 21 : 503-8, 1994

16 "Fractional Brownian-motion:a maximum likelihood estimator and its application to imaging texture" 5 : 152-61, 1986

17 "Fractal signature analysis of macroradiographs measures trabecular organization in lumber vertebrae of postmenopausal women" 54 : 106-12, 1994

18 "Fractal properties of bone" 29 : 144-53, 2000

19 "Fractal dimension in radiographic analysis of alveolar process bone" 82 : 569-76, 1996

20 "Fractal dimension from radiographs of periodontal alveolar bone:A possible diagnostic indicator of osteoporosis" 74 : 98-110, 1992

21 "Fractal dimension calculated from two types of region of interest" 28 : 284-9, 1999

22 "Fractal analysis of dental radiographs to assess trabecular bone structure"

23 "Endodontic success-Whos reading the radiograph" 33 : 432-7, 1972

24 "Detecting osteoporosis using dental radiographs" 27 : 1734-42, 1996

25 "Application of fractal geometry techniques to the study of trabecular bone" 20 : 1611-9, 1993

26 "Analysis of texture in macroradiographs of osteoarthritic knees using fractal signature" 21 : 709-22, 1991

27 "A robust and accurate method for calculating fractal signature of texture in macroradiographs of osteoarthritic knees" 16 : 241-51, 1991