• Title/Summary/Keyword: dental arch width

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Effect of different arch widths on the accuracy of three intraoral scanners

  • Kaewbuasa, Narin;Ongthiemsak, Chakree
    • The Journal of Advanced Prosthodontics
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    • v.13 no.4
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    • pp.205-215
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    • 2021
  • PURPOSE. The purpose of this study was to compare the accuracy of three intraoral scanner (IOS) systems with three different dental arch widths. MATERIALS AND METHODS. Three dental models with different intermolar widths (small, medium, and large) were attached to metal bars of different lengths (30, 40, and 50 mm). The bars were measured with a coordinate measuring machine and used as references. Three IOSs were compared: TRIOS 3 (TRI), True Definition (TD), and Dental Wings (DW). The relative length and angular deviation of both ends of the metal bars from the scan data set (n = 15) were calculated and analyzed. RESULTS. Comparing among scanners in terms of trueness, the relative length deviation of DW in the small (1.28%) and medium (1.08%) arches were significantly higher than TRI (0.46% and 0.48%) and TD (0.33% and 0.18%). The angular deviation of DW in the small (1.75°) and medium (1.83°) arches were also significantly greater than TRI (0.63° and 0.40°) and TD (0.55° and 0.89°). Comparing within scanner, the large arch of DW showed better accuracy than other arch sizes (P < .05). On the other hand, the larger arch of TD presented a greater tendency of angular deviation in terms of trueness. No significant differences were found in terms of trueness between the arch widths of TRI group. CONCLUSION. The different widths of the dental arches can affect the accuracy of some intraoral scanners in full arch scan.

A STUDY ON THE RATIO OF THE DENIAL ARCH STRUCTURE IN KOREANS (한국인 치열궁구조의 비례에 관한 연구)

  • Park, Je-Uk;Nahm, Dong-Seok
    • The korean journal of orthodontics
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    • v.18 no.1 s.25
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    • pp.165-173
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    • 1988
  • The purpose of this study was to investigate and evaluate what proportion is the characteristics in Korean dental arches with normal occlusion. Many others have already indicated Golden proportion in normal dental arches, but have not considered any racial and sociocultural differences. So the author postulated $(\sqrt{2})^n$ relations in Koreans. The materials were consisted of 134 dental casts with normal occlusion, which have never undergone orthodontic and prosthodontic procedures. Measurements were made on the arch dimensions using sliding caliper and data were computerized. The findings were as follows: 1. The width between the distal surfaces of the upper centrals, had $(\sqrt{2})^3$ relation with the width between the buccal surfaces of the upper 1 st premolars in Koreans. 2. The width between the distal surfaces of the lower laterals had $(\sqrt{2})$ relation with the width between the distal surfaces of the lower canines, and had $(\sqrt{2})^2$ relation with the distal surfaces of the upper centrals. 3. The width between the distal surfaces of the lower centrals had $(\sqrt{2})^2$ relation with the width between the distal surfaces of the lower laterals, and had $(\sqrt{2})^3$ relation with the width between the distal surfaces of the upper centrals.

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MEASUREMENT OF THE DENTAL ARCH DIMENSION IN KOREAN YOUNG ADULTS. (한국인청년남자의 치궁에 관한 계측)

  • Kim, Yeong-Hae
    • The Journal of the Korean dental association
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    • v.13 no.1
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    • pp.33-36
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    • 1975
  • To determine the dental arch length and width in Korean yaung adults, various points (shown on Fig 1) were measured by means of Boley gauge on the 124 plaster models which obtained from 2 young men. The measurements value were as follows: A : 36.10㎜ a : 25.53㎜ B : 33.35㎜ b : 28.20㎜ C : 39.80㎜ c : 33.07㎜ D : 43.36㎜ d : 36.36㎜ E : 44.80㎜ e : 39.12㎜ F : 49.11㎜ f : 42.48㎜ G : 59.98㎜ g : 44.92㎜ H : 62.22㎜ h : 57.85㎜ I : 52.66㎜ i : 49.91㎜

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Relationship of Dental Crowding to Tooth Size and Arch Width (치아 크키와 치열궁 폭경이 치아밀집에 미치는 영향)

  • Hwang, Hyeon-Shik;Kim, Jeong-Tae;Cho, Jin-Hyoung;Baik, Hyoung-Seon
    • The korean journal of orthodontics
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    • v.34 no.6 s.107
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    • pp.488-496
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    • 2004
  • The purpose of the present study was to investigate the relationship of dental crowding to tooth size and arch dimension in Korean subjects. Two groups of dental casts with Class I molar relationship, were selected on the basis of crowding. One group, consisting of 82 pairs of study cast (29 males and 53 females), exhibited at least 7 millimeters of crowding in each arch. A second group, consisting of 82 sets of study cast (37 males and 45 females), exhibited normal occlusion with little or no crowding. Mesiodistal tooth diameters, and buccal and lingual dental arch widths were measured and compared between the crowding and normal occlusion groups. Significant differences were observed between the two groups not only in arch widths but also in tooth sizes. The results of the present study suggest that both extraction and expansion can be used as a treatment approach for the crowding cases.

Change in arch width in extraction vs nonextraction treatment (발치 및 비발치 치료 전후 악궁 폭경의 변화)

  • Jeon, Ji-Yun;Kim, Su-Jung;Kang, Seung-Goo;Park, Young-Guk
    • The korean journal of orthodontics
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    • v.37 no.1 s.120
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    • pp.65-72
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    • 2007
  • Objective: This study was performed to investigate the influences of extraction and nonextraction treatment on smile esthetics by measuring dental arch width changes. Methods: Pretreatment and posttreatment study models of 30 first premolar extraction cases and 30 nonextraction cases were randomly selected to determine whether extraction treatment results in narrow dental arches, and a consequent unaesthetic smile. Arch widths were measured from the cusp tips of the canines and the first molars. Posterior arch widths were also measured at a constant arch depth derived by averaging randomly chosen nonextraction models. Results: The intercanine widths increased significantly in the extraction sample, whereas the intermolar widths decreased significantly. The arch width at a standardized arch depth was significantly wider in the extraction subjects. Conclusion: These results elucidate that constriction in arch width is not a materialized consequence of extraction treatment. It leads to postulate that an esthetically compromising effect from narrow dental arches on smile is hardly anticipated with extraction treatment.

The new approach to maxillary and mandibular anterior dental arch forms - The prediction to maxillary and mandibular anterior occlusal relationship by computer program (상하악 전치부 치열궁 형태에 대한 새로운 접근 - 컴퓨터 프로그램을 이용한 상하악 전치부 교합관계에 대한 예측)

  • Ha, Man-Hee;Yang, Hoon-Cheol;Kim, Gi-Tae;Son, Woo-Sung
    • The korean journal of orthodontics
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    • v.32 no.1 s.90
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    • pp.43-49
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    • 2002
  • When we deal with maxillary and mandibular anterior dental arches showing problems in occlusal relation and aesthetics caused by malformations of teeth and congenital missing, et al during the orthodontic treatment, we could not often decide the functional occlusion by only relying on the orthodontic treatment. If orthodontists can predict what kinds of treatments are needed for functional occlusion in maxillary and mandibular anterior dental arches, they can not only effectively treat patients but also facilitate the cooperation with other field during the treatment, Our previous research showed the correlation among intercanine width, segment depth and arch perimeter by using the Korean normal occlusion model. At this time, we produced the computer application program by taking advantage of this correlation. And then, we applied this program to setting up the treatment plans for 2 patients with the damaged maxillary and mandibular dentures. With the help of this program, we could not only easily acquire the information about the change of variables required by treatment plans but also intercanine width, segment depth and arch perimeter. Later, if we can the information about the relationship between the change of the angle of incisors depending on facial types and arch forms and, in addition, can acquire the appropriate intercanine width, we can have the ability to produce the 3 dimensional occlusogram for the anterior dental arch forms.

A STUDY ON THE PREDICTION OF INCIPIENT ARCH CROWDING IN CHILDREN (초기 Arch Crowding 예측에 관한 연구)

  • Chang, Young-Il
    • The korean journal of orthodontics
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    • v.13 no.2
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    • pp.205-208
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    • 1983
  • Widths between the first permanent molars and the mesio-distal widths of the four anterior teeth were measured on 32 lower and 33 upper dental casts of young adults aged 18-25 yerars. The casts were grouped in five categories-two where no anterior crowding existed, and three in which varying degrees of crowding were present. Subjects with a difference between arch width and anterior tooth widths greater than 4mm in the upper arch, or 10mm in the lower arch, rarely had crowding. As arch width changes very little from age 7 onwards, measurements at this age may be used as a screening mechansim for future arch crowding.

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A STUDY ON THE RELATIONSHIP OF BETWEEN FACIAL AND ORAL ANATOMIC LANDMARK AND VERTICAL DIMENSION IN KOREAN ADULTS (한국인(韓國人) 안면(顔面) 및 구강내(口腔內) 해부학적(解剖學的) 기준점(基準點) 측정(測定)과 垂直高經(수직고경)과의 관계(關係)에 대한 연구(硏究))

  • Park Sook-Hyun;Heo Seong-Joo;Cho In-Ho
    • The Journal of Korean Academy of Prosthodontics
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    • v.30 no.1
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    • pp.43-54
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    • 1992
  • The purpose of this study was to obtain the guides of establishing vertical dimension by analyzing the facial and oral landmarks of Korean adults. The following conclusions were obtained from this study. 1. The ratio of bizygomatic width to dental arch width was 3.26 : 1 in male and 3.21 : 1 in female, and the ratio of vertical dimension to dental arch length was 2.49 : 1 in male and 2.39 : 1 in female. 2. It was obtained by analysis of multiple regression that the corelative formula, vertical dimension$=23.37+0.24{\times}bizygomatic$ $width+0.29{\times}dental$ arch length. 3. There was no statistically significant difference between the results of vertical dimension acquired by means of Hayakawa's prediction($68.04{\pm}3.16mm$ in male, $64.38{\pm}3.00mm$ in female) and that of vertical dimension by this study.

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Orthodontic treatment in a patient with Moebius syndrome: A case report

  • Lee, Sanghee;Moon, Cheol-Hyun
    • The korean journal of orthodontics
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    • v.52 no.6
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    • pp.451-460
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    • 2022
  • Moebius syndrome (MBS) is a congenital neurologic disorder that causes cranio-facial abnormalities. It involves paralysis of the VI and VII cranial nerves and causes bilateral or unilateral facial paralysis, eye movement disorder, and deformation of the upper and lower limbs. The orofacial dysfunctions include microstomia, micrognathia, hypotonic mimetic and lip muscles, dental enamel hypoplasia, tongue deformity, open bite or deep overbite, maxillary hypoplasia, high arched palate, mandibular hyperplasia or features indicating mandibular hypoplasia. This case report presents a 7-year-old male patient who was diagnosed with MBS at the age 2 years. The patient displayed typical clinical symptoms and was diagnosed with Class II malocclusion with a large overjet/overbite, tongue deformity and motion limitation, and lip closure incompetency. Treatment was initiated using a removable appliance for left scissor bite correction. After permanent tooth eruption, fixed appliance treatment was performed for correction of the arch width discrepancy and deep overbite. A self-ligation system and wide-width arch form wire were used during the treatment to expand the arch width. After 30 months of phase II treatment, the alignment of the dental arch and stable molar occlusion was achieved. Function and occlusion remained stable with a Class I canine and molar relationship, and a normal overjet/overbite was maintained after 9.4 years of retainer use. In MBS patients, it is important to achieve an accurate early diagnosis, and implement a multidisciplinary treatment approach and long-term retention and follow-up.

DENTAL CROWDING AND ITS RELATIONSHIP TO TOOTH SIZE AND ARCH DIMENSION IN KOREAN (한국인에서 치아 및 악궁의 크기와 총생의 관계)

  • Lee, Nan-Young;Hong, Sung-Su;Lee, Sang-Ho
    • Journal of the korean academy of Pediatric Dentistry
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    • v.33 no.3
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    • pp.510-521
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    • 2006
  • This investigation was undertaken to examine the extent to which tooth size and arch dimension each contribute to dental crowding. The sample included 50 subjects with well aligned dentition (25 males, 25 females) and those of 40 subjects with gross dental crowding(20 males, 20 females). Plaster model and digital model made from alginate impression taken at the one visit. Tooth size, arch length, arch perimeter, intercanine width and intermolar width was measured on the plaster and digital models. The findings in this study lead to the following conclusions. 1. In maxilla, the mesiodistal diameters of lateral incisor and premolars of the crowded group were significantly larger than those of the normal occlusion group (P<0.05). 2. In mandible, the mesiodistal diameters of central incisor, canine and premolars of crowded group were significantly larger than those of the normal occlusion group (P<0.05). 3. In maxilla, arch perimeter and intermolar width of crowded group were significantly smaller than normal occlusion group but intercanine width of crowded group were larger than normal occlusion group (P<0.05). There was no significantly difference in arch length (P>0.05). 4. In mandible, arch perimeter of crowded group was smaller than normal occlusion group(P<0.05). There were no difference in arch length intermolar width and intercanine width (P>0.05) 5. In the analysis of correlation coefficients of arch length discrepancy with variables, arch perimeter, intermolar width and mesiodistal width of 2nd premolar showed positive correlations in maxilla. 6. There was a significant difference between tooth width measurements made by the 2 methods, with all the digital model measurement larger than plaster model measurements (P<0.05) : the magnitude of the differences does not appear to be clinically relevant. 7. In the analysis for reproducibility, the plaster model measurement was showed lower degree of correlation between 1st and 2nd measurement than digital model.

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