• The Journal of Advanced Prosthodontics
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• 제9권5호
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• pp.321-327
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• 2017

PURPOSE. The aim of this study was to investigate dental arch dimensions and to classify arch shape in Korean young adults. MATERIALS AND METHODS. The sample included 50 Koreans with age ranging from 24 to 32 years. Maxillary and mandibular casts were fabricated using irreversible hydrocolloid and type III dental stones. Incisor-canine distance, $incisor-1^{st}$ molar distance, $incisor-2^{nd}$ molar distance, intercanine distance, $inter-1^{st}$ molar distance, and $inter-2^{nd}$ molar distance in both the maxillary and mandibular arch were measured using a three-dimensional measuring device. The dental arch was classified into three groups using five ratios from the measured values by the K-means clustering method. The data were analyzed with one-way analysis of variance. RESULTS. Arch lengths (IM2D, $incisal-2^{nd}$ molar distance) were 44.13 mm in the maxilla and 40.40 mm in the mandible. Arch widths (M2W, inter $2^{nd}$ molar width) were 64.12 mm in the maxilla and 56.37 mm in the mandible. Distribution of the dental arch form was mostly ovoid shape (maxilla 52% and mandible 56%), followed by the V-shape and the U-shape. The arch width for the U-shape was broader than for the other forms. CONCLUSION. This study establishes new reference data for dental arch dimensions for young Korean adults. The most common arch form is the ovoid type in the maxilla and mandible of Koreans. Clinicians should be aware of these references and classify arch type before and during their dental treatment for effective and harmonized results in Koreans.

• 대한치과의사협회지
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• 제17권12호통권127호
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• pp.909-917
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• 1979

• 대한치과보철학회지
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• 제9권1호
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• pp.9-15
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• 1969

The purpose of this study was to examine arch form, occlusion in centric occlusion. Male 561 case, Female 305 case were impressioned with alginate impression material, and plaster models were made. Occlusion and maxillary dental arch were studied on plaster models in Korean adults aged from 18 to 60 Years. The results were as follows. 1. The upper dental arch was U-type(57.77%), O-type(23.52%), V-type(18.71%) in male, and U-type(60.66%), O-type(27.11%), V-type(12.13%) in female. 2. The commonest type of the anterior bite was 1-form($68.09{\pm}1.97%$) in male, ($72.46{\pm}2.56%$) in female, and posterior bite was 1-form($65.06{\pm}2.01%$) in male, ($69.51{\pm}2.64%$ in female. 3. In the maxillary dental arch U-type was frequented and the relationship of occlusion in upper and lower dental arch was mainly 1-form.

• 대한치과의사협회지
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• 제11권4호
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• pp.277-280
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• 1973

The author observed the changes of dental arch dimensions and compared spae-maintainer group with non-space-maintainer group after primary tooth extraction. The results were as follows 1) The rate of growth of dental arch of expeirmental group in intercanine width and in inter-1st molar width was more rapid than that of the control group. 2) Arch length is almost no dimensions but it was slightly decreased in lower arch. 3) Dental arch growth and tooth eruption were stimulated by space-maintainer appliance, so it is the best way to replace a new appliance at least once a year. 4) It is thought that satisfactory conclusions in this observation must be researched successively until the mixed dentition completes.

• 대한치과교정학회지
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• 제41권4호
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• pp.224-236
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• 2011

본 연구는 정상교합자의 치열궁과 기저골 형태를 파악하기 위해 시행하였다. 정상교합자 27명(남-15명: 25Y $10M{\pm}4Y$ 4M/여-12명: 26Y $1M{\pm}7Y$ 4M)을 대상으로 두개골의 전산화 단층촬영을 시행하고 입체영상을 제작한 뒤, 상악 중절치의 FA point의 중점을 원점으로 하는 3차원 좌표계를 형성하였다. 또한 상악 교합평면과 평행한 면으로 절단하여 상하악의 치열궁과 기저골의 형태에 대해 분석하였다. 상하악기저골은 A point, B point 부위와 양측 제1대구치 부위의 좌표에서 통계적으로 유의한 차이가 나타나지 않았다. 또한 상하악의 치열궁은 기저골악궁에 비해 전치부에서 순측으로 위치하였다. 또한 치열궁과 기저골악궁의 협설측 교차는 상악은 대구치 부위에서, 하악은 소구치 부위에서 이루어졌다.

• 대한치과보철학회지
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• 제30권2호
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• pp.273-285
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• 1992

The purpose of this study was to evaluate facial form, arch form and tooth form in young adults to determine if a correlation exists. 115 subjects who had healthy natural maxillary incisors and good occlusion consisted of 71 males and 44 females ranging from 20-30 years of age. Facial photographs and, intraoral photographs of upper anterior teeth and dental casts of upper jaws were taken to demonstrate facial form, dental arch form and tooth form. Form analysis is determined by comparing the ratio of the widths of the faces, dental archs and the teeth. The Chi-square test of independence between facial form, arch form and tooth form, was executed and the significance level determined. The results were as follows : 1. The distribution of facial forms was 66.1% square-tapering, 27.0% square, 5.2% ovoid, 2% tapering-square. 2. The distribution of tooth forms was 65.2% ovoid, 20.0% square-tapering, 11.3 % tapering-square, 3.5 % square. 3. The distribution of arch forms was 50.4 % square-tapering, 48.7 % tapering, 0.9 % reverse tapering-square. 4. There was no large differences in the distribution of facial forms, dental arch forms and tooth-forms between male and female. 5. No relationship existed between the tooth form and the facial form. 6. No relationship existed between the facial form and the dental arch form. 7. No relationship existed between the tooth form and the dental arch form. 8. This gave the impression that dental arch form and facial form could not be used as a true index in tooth selection.

• 대한치과교정학회지
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• 제43권1호
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• pp.15-22
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• 2013

Objective: The purpose of this study was to investigate the relationship between the mandibular dental and basal arch forms in subjects with normal occlusion and compare them with those of Class III malocclusion using cone-beam computed tomography (CBCT). Methods: CBCT images of 32 normal occlusion (19 males, 13 females; 24.3 years) and 33 Class III malocclusion subjects (20 males, 13 females, 22.2 years) were selected. Facial axis and root center points were identified from the left to right mandibular first molars. Distances between the facial axis and root center points for each tooth were calculated, and 4 linear and 2 ratio variables were measured and calculated for each arch form. The variables were compared between groups by independent t-test. Pearson correlation coefficient was applied to assess the relationships between dental and basal variables within each group. Results: The mandibular dental and basal intercanine widths were significantly greater in the Class III group than in normal occlusion subjects (p < 0.05). The dental and basal intercanine widths as well as the dental and basal intermolar widths were strongly correlated in normal occlusion and moderately correlated in Class III malocclusion. Conclusions: The dental arch form demon strated a strong positive correlation with the basal arch form in the normal occlusion group and moderate correlation in the Class III malocclusion group. These results might be helpful for clinicians to have a better understanding of the importance of basal arch form in the alveolar bone.

• 치위생과학회지
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• 제13권2호
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• pp.197-202
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• 2013

본 연구는 치위생과 학생 147명을 대상으로 체격에 따른 치열궁 크기의 관련성을 조사하고자 실시하였다. 연구를 위해 설문지 작성과 치열궁 장 폭경 계측을 위한 인상채득이 동시에 실시되었으며, 다음과 같은 결론을 얻었다. 1. 1년 이내에 구강검진 경험이 있는 경우는 74.8%, 코로 숨을 쉬는 경우는 86.4%, 교정과 발치경험이 있는 경우는 각각 18.4%, 49.7%로 조사되었다. 정제된 음식은 94.6%가 좋아한다고 응답하였으며, 단단한 음식은 52.4%가 좋아한다고 응답하였다. 2. 치열궁 크기의 관련 요인에 따른 치열궁 장 폭경은 모든 변수가 통계적으로 유의한 차이를 보이지는 못했다. 3. 체격에 따른 치열궁 장 폭경 중 통계적으로 유의한 차이를 나타낸 변수는 신장과 체중이었으며, 신장이 클수록 상악 치열궁 장경이 크게, 체중이 많이 나갈수록 하악 견치간 폭경과 상악 구치간 폭경도 큰 것으로 나타났다. 4. 체중이 많이 나갈수록 상, 하악 견치간 폭경과 상, 하악 구치간 폭경이 약한 양의 상관관계를 보였으며, 상하악 치열궁 장경과 견치간 폭경, 구치간 폭경에서는 상악 구치간폭경과 하악 구치간 폭경이 가장 높은 관련성을 보였다. 이상의 결과로 보아 체격요건 중 체중이 치열궁 형태에 영향을 주었다. 앞으로도 체격변화에 따른 치열궁의 변화를 지속적으로 조사함으로써 안정적인 교합과 구강건강을 위한 자료로 활용할 수 있도록 해야 할 것이다.

• 대한치과교정학회지
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• 제41권4호
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• pp.288-296
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• 2011

Objective: The purposes of this study were to evaluate the relationship between the dental and basal arch forms; to analyze their differences in the tapered, ovoid, and square arch forms in normal occlusion by using three-dimensional (3D) virtual models; and to test the hypothesis that the overjet and maxillomandibular basal arch width difference have a significantly positive correlation. Methods: Seventy-seven normal occlusion plaster casts were examined by 3D scanning. Facial axis (FA) and WALA points were digitized using the Rapidform 2006 software. The dimensions of the dental and basal arches and the overjet were measured. The samples were classified into 3 groups according to arch forms: tapered (n = 20), ovoid (n = 20), and square (n = 37). Analysis of variance (ANOVA) was used to compare the dental and basal arch dimensions. The Pearson correlation coefficients between the intercanine as well as the intermolar widths at the FA and WALA points were calculated. Results: With regard to the basal arch dimensions, the tapered arch form showed a larger mandibular intermolar depth than the ovoid. Strong correlations were noted between the basal and dental intermolar widths in both the upper and lower arches (r = 0.83 and 0.85, respectively). Moderate correlation was found between the upper and lower intercanine widths (r = 0.65 and 0.48, respectively). Conclusions: The 3 dental arch form groups differed only in some dimensions of the skeletal arch. Moderate correlations were found between the basal and dental intercanine widths. These findings suggest that the basal arch may not be a principle factor in determining the dental arch form.

• 대한치과의사협회지
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• 제13권4호
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• pp.329-334
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• 1975

In 190 dental casts of Korean adults, 78 males and 112 females, the author measured cuspal distances beween the lingual cusps of the samed named teeth. And following conclusions were obtained : 1. In maxillary dental arch, the smallest measurement was revealed in the interpremolar distance in both sexes. 2. In mandibular dental arch, the intercanine distance was the smallest, and then measurements were increased in molar region. 3. In both sexes the intermolar distance was smaller than the central incisor to first molar distance.