성장기 환자의 교정 치료에서 바람직한 치료 결과를 얻기 위해서는 성장을 정확하게 예측하는 것이 중요하다. 성장 과정은 개인마다 상당한 차이를 보이기 때문에 성장 평가를 위해서는 연대 연령이 아닌 생리적인 연령을 사용해야 한다. 본 연구의 목적은 사춘기 동안 발육하는 하악 제3대구치에서 치아성숙도를 측정하고 성장 평가 지표로서의 그 가치를 평가하고자 하는 데 있다. 연세대학교 치과대학병원 교정과에 내원한 성장기 여자 환자 270명을 대상으로 제3대구치의 치아 성숙도(Demirjian index), 경추의 골 성숙도(CVMI), 수완부 골 성숙도(SMI), 초경 연령 등을 평가하여 분석하였다. 연구 결과 Demirjian Index와 SMI, CVMI 간의 상관관계에서 SMI와 Demirjian index (r = 0.64), CVMI와 Demirjian index (r = 0.59)는 통계적으로 유의한 양의 상관관계를 보였다 (p < 0.001). 그러나 초경 연령과 Demirjian index간의 상관관계(r = 0.26)는 낮았으며 (p < 0.001), Demirjian index를 통해 평가한 제3대구치의 치아성숙도는 I, II, III급 부정교합 간에 차이가 없는 것으로 나타났다. 그리고 제3대구치 치관이 완성되고 치근이 형성되기 시작하는 Demirjian index I단계 이상이면 SMI 10단계, CVMI 5단계 이상에 속하였다. 하악 제3대구치의 발육단계를 이용한 치아성숙도 평가는 경추 및 수완부 골성숙도와 조합하여 사용한다면 사춘기 성장 평가에 있어 하나의 보조적인 수단으로 활용될 수 있을 것이다.
성장기 환자의 교정 치료에서 바람직한 치료 결과를 얻기 위해서는 성장을 정확하게 예측하는 것이 중요하다. 성장 과정은 개인마다 상당한 차이를 보이기 때문에 성장 평가를 위해서는 연대 연령이 아닌 생리적인 연령을 사용해야 한다. 본 연구의 목적은 사춘기 동안 발육하는 하악 제3대구치에서 치아성숙도를 측정하고 성장 평가 지표로서의 그 가치를 평가하고자 하는 데 있다. 연세대학교 치과대학병원 교정과에 내원한 성장기 여자 환자 270명을 대상으로 제3대구치의 치아 성숙도(Demirjian index), 경추의 골 성숙도(CVMI), 수완부 골 성숙도(SMI), 초경 연령 등을 평가하여 분석하였다. 연구 결과 Demirjian Index와 SMI, CVMI 간의 상관관계에서 SMI와 Demirjian index (r = 0.64), CVMI와 Demirjian index (r = 0.59)는 통계적으로 유의한 양의 상관관계를 보였다 (p < 0.001). 그러나 초경 연령과 Demirjian index간의 상관관계(r = 0.26)는 낮았으며 (p < 0.001), Demirjian index를 통해 평가한 제3대구치의 치아성숙도는 I, II, III급 부정교합 간에 차이가 없는 것으로 나타났다. 그리고 제3대구치 치관이 완성되고 치근이 형성되기 시작하는 Demirjian index I단계 이상이면 SMI 10단계, CVMI 5단계 이상에 속하였다. 하악 제3대구치의 발육단계를 이용한 치아성숙도 평가는 경추 및 수완부 골성숙도와 조합하여 사용한다면 사춘기 성장 평가에 있어 하나의 보조적인 수단으로 활용될 수 있을 것이다.
Objective: To estimate dental maturity using the Demirjian Index for the mandibular third molar and investigate the relationships between dental maturity and skeletal maturity among growing children. Methods: The samples were derived from panoramic, lateral cephalometric and hand-wrist radiographs o...
Objective: To estimate dental maturity using the Demirjian Index for the mandibular third molar and investigate the relationships between dental maturity and skeletal maturity among growing children. Methods: The samples were derived from panoramic, lateral cephalometric and hand-wrist radiographs of 270 female subjects registered as patients at the orthodontic department, dental hospital, Yonsei University. Dental maturity [Demirjian Index (DI)] and skeletal maturity [skeletal maturation indicators (SMIs)] and cervical vertebrae maturation indicators (CVMIs)] were estimated from these radiographs. Results: There was a significant correlation (r = 0.64) between SMIs and DI, and a similar correlation (r = 0.59) was observed between CVMIs and DI (p < 0.001). If DI was above Stage E, then the SMI was above Stage 10 and the CVMI was above Stage 5. There was a weak correlation (r = 0.26) between age at menarche and DI (p < 0.001). There was no significant difference in DI among Class I, II or III malocclusions. Conclusions: Dental maturity evaluation using the mandibular third molar will be an adjunctive tool in combination with cervical vertebrae and hand-wrist maturity evaluations.
Objective: To estimate dental maturity using the Demirjian Index for the mandibular third molar and investigate the relationships between dental maturity and skeletal maturity among growing children. Methods: The samples were derived from panoramic, lateral cephalometric and hand-wrist radiographs of 270 female subjects registered as patients at the orthodontic department, dental hospital, Yonsei University. Dental maturity [Demirjian Index (DI)] and skeletal maturity [skeletal maturation indicators (SMIs)] and cervical vertebrae maturation indicators (CVMIs)] were estimated from these radiographs. Results: There was a significant correlation (r = 0.64) between SMIs and DI, and a similar correlation (r = 0.59) was observed between CVMIs and DI (p < 0.001). If DI was above Stage E, then the SMI was above Stage 10 and the CVMI was above Stage 5. There was a weak correlation (r = 0.26) between age at menarche and DI (p < 0.001). There was no significant difference in DI among Class I, II or III malocclusions. Conclusions: Dental maturity evaluation using the mandibular third molar will be an adjunctive tool in combination with cervical vertebrae and hand-wrist maturity evaluations.
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문제 정의
If it is verified that there is a positive correlation between third molar development and general growth, it could be possible to use the third molar as a growth indicator in pubertal patients. The aims of this study were to estimate dental maturity using the Demirjian Index for the mandibular third molar, to investigate the relationships between dental maturity and skeletal maturity among growing patients and to evaluate the clinical value of the third molar as a growth evaluation index.
가설 설정
1. Well-nourished and free of any known serious disease.
2. If the Demiijian Index was above Stage E, SMI was above Stage 10 and CVMI was above Stage 5.
001). 4. There was no significant difference in the Demiijian Index among Class I, II or Ⅲ malocclusions.
제안 방법
Based on the results of this study, a dental maturity evaluation using the mandibular third molar would be an adjunctive tool to adolescent growth assessment in combination with cervical vertebrae and hand-wrist maturity evaluations. In particular, since it has been proven that a Demirjian Index score above Stage E means that the SMI Stage is above 10 and the CVMI Stage is above 5, judging the completion of growth may be possible when the beginning of root formation of the third molar is seen on a radiograph.
Every female in this study was classified into skeletal Class I, Ⅱ, or Ⅲ malocclusion to measure the Demirjian Index in an attempt to evaluate the presence of difference in development for each class.
In this study, we used the left lower third molar as a sample because estimation enors occur more fre-q니ently in calculating the maturation of the upper molar than the lower molar. Sometimes the upper third molar root is overlapped with anatomic structures such as the palate, the inferior border of the zygomatic arch or the maxillary sinus septum.
57, 13'16 Third molars were excluded from most of the studies due to their assumed developmental variations. The aim of this study was to investigate the relationship between dental maturity and skeletal maturity using the development of the third molar in the mandible and also to evaluate the clinical value of the third m이ar.
The aims of this study were to evaluate a correlation between dental maturity and skeletal maturity of cervical vertebrae and hand-wrist and to estimate the clinical predictive value of the third molar. For this study, the samples were derived from panoramic, lateral cephalometric and hand-wrist radiographs of 270 female adolescents.
The revealed correlation between lower third molar development and skeletal maturity in this study will allow clinicians to use the mandibular third molar as an adjunctive tool to adolescent growth assessment in combination with cervical vertebrae and hand-wrist maturity evaluations. Individual variations should be taken into consideration when using the developmental stage of the third molar in growth evaluations because third molars are known for their many variations based on previous studies.
대상 데이터
5 years. All the samples were at SMI Stage 11 and CVMI Stage 6 휹f Demiijian Stage G and H where root formation is almost completed (Table 3).
predictive value of the third molar. For this study, the samples were derived from panoramic, lateral cephalometric and hand-wrist radiographs of 270 female adolescents. Dental maturity (Demiijian Index) and skeletal maturity (skeletal maturation indicators) and
The samples were derived from panoramic, lateral cephalometric and hand-wrist radiographs of 270 female subjects registered as patients at the orthodontic department of the dental hospital at Yonsei University. The age range of the sample was from 9.
데이터처리
(2) The Pearson correlation analysis was used to verify the relationship among the SMI, the CVMI and the Demirjian Index.
(4) To evaluate the variations of third molar development among malocclusion classes, median, minimum, and maximum values of the Demirjian Index at every SMI stage for each malocclusion class were determined followed by a Kruskal-Wallis Test for the verification of variations.
이론/모형
In addition, tooth eruption can be altered by local factors, systemic diseases and nutritional habits; the reliability of the method is questionable. Therefore, dental maturity in this study was determined by evaluating the stages of tooth formation, with an emphasis on Demiijian's method. The root of the third molar tends to be less divergent and more fused, making it harder to evaluate its development according to root length.
성능/효과
1. There was a significant correlation (r = 0.64) between the SMI and the Demiijian Index, and a similar correlation (r = 0.59) was observed between the CVMI and the Demiijian Index (p < 0.001).
3. There was a weak correlation (r = 0.26) between menarche and the Demiijian Index (p < 0.001). 4.
There was a statistically significant correlation between the development of the third molar (Demiijian Index) and SMI (r = 0.64), and the Index and CVMI (r 드 0.59), with a slightly higher correlation found between SMI and the Demiijian Index. SMI and CVMI also had a high correlation (r = 0.
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