Tweed triangle and soft-tissue consideration of Japanese with normal occlusion and good facial profile

Iwasawa, T; Moro, Takashi; Nakamura, Katsuhiko

doi:10.1016/0002-9416(77)90054-9

Cited by 30 publications

(17 citation statements)

References 9 publications

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“…In addition, consideration must be given to reconstructing the symphysis by reduction genioplasty as an additional surgical operation to decrease the lower third facial height and the prominent chin. Our analysis including soft tissue measurements can clarify the morphological characteristics of orthognathic surgical cases in the Class III group better than conventional cephalometric analyses 3,6,7) even though there are still some measurement variables.…”

Section: Discussionmentioning

confidence: 94%

“…its facial, skeletal and dental components, along with a recognition of the limitations of current orthodontic therapy 14) . A number of cephalometric assessments 3,6,7,11,12) are primarily designed to harmonize the position of the teeth with the existing skeletal pattern. These analyses are commonly used for orthodontic analysis.…”

Section: Cephalometric Landmarksmentioning

confidence: 99%

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Morphological evaluations in skeletal Class III malocclusion requiring maxillofacial surgery using orthognathic surgical analysis.

Nojima

Nagai²,

Nishii

et al. 2002

Bull. Tokyo Dent. Coll.

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The purpose of this study was to establish a Japanese standard norm for orthognathic surgical analysis to be used in clinical applications and to clarify maxillofacial morphological characteristics in skeletal Class III malocclusions requiring orthognathic surgery. The materials were pretreatment lateral cephalometric radiographs in the relaxed lip posture from 50 subjects with skeletal Class III malocclusions diagnosed as requiring orthognathic surgery. The control group consisted of 50 subjects with normal occlusion and well-balanced faces. Detailed cephalometric measurements were recorded and analyzed statistically. The skeletal, dental, and soft tissue measurements from the normal group did not reveal any marked differences between the sexes. The Class III group exhibited a more retrognathic maxilla and prognathic mandible, a steeper mandibular plane, a more prominent chin, and a larger lower facial height in the skeletal measurements; a significant lingual inclination of the mandibular incisor in the dental measurement; and a more concave profile with prognathic mandible, a larger lower facial height, a more acute nasolabial angle and chin in the soft tissue measurements. We suggest that this analysis can be clinically useful in diagnosis, treatment planning, and posttreatment evaluation for orthognathic surgical cases who are Class III patients.

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Section: Discussionmentioning

confidence: 94%

Section: Cephalometric Landmarksmentioning

confidence: 99%

Morphological evaluations in skeletal Class III malocclusion requiring maxillofacial surgery using orthognathic surgical analysis.

Nojima

Nagai²,

Nishii

et al. 2002

Bull. Tokyo Dent. Coll.

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“…This may be explained by the fact that greater buccal inclination of incisors reduces vertical trespass, which was also observed by Iwasawa, Moro and Nakamura. 14 …”

Section: Discussionmentioning

confidence: 99%

Comparative study of dental cephalometric patterns of Japanese-Brazilian, Caucasian and Mongoloid patients

Sathler

Pinzan

Fernandes

et al. 2014

Dental Press J. Orthod.

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IntroductionThe objective of this study was to identify the patterns of dental variables of adolescent Japanese-Brazilian descents with normal occlusion, and also to compare them with a similar Caucasian and Mongoloid sample.MethodsLateral cephalometric radiographs were used to compare the groups: Caucasian (n = 40), Japanese-Brazilian (n = 32) and Mongoloid (n = 33). The statistical tests used were one-way ANOVA and ANCOVA. The cephalometric measurements used followed the analyses of Steiner, Tweed and McNamara Jr.ResultsStatistical differences (P < 0.05) indicated a smaller interincisal angle and overbite for the Japanese-Brazilian sample, when compared to the Caucasian sample, although with similar values to the Mongoloid group.ConclusionThe dental patterns found for the Japanese-Brazilian descents were, in general, more similar to those of the Mongoloid sample.

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“…Kocadereli 22 found greater treatment time for non-extraction and extraction cases, 26.35 ±13.25 months and 31.53 ± 14.10 months, respectively. Interestingly, Germec and Taner 14 found that borderline Class I cases treated with extraction lasted 24.8 ±6.9 months while those treated with stripping lasted 17 ± 4 6 months. On the other hand, Skidmore et al 32 reported that treatment duration of their Class I sample was 21.9 months, despite the fact that they used different treatment protocols.…”

Section: Comparison Between Groups and Variablesmentioning

confidence: 98%

Influence of initial occlusal severity on time and efficiency of Class I malocclusion treatment carried out with and without premolar extractions

Leon-Salazar

Janson

Henriques

et al. 2014

Dental Press J. Orthod.

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IntroductionThe aim of this retrospective study was to compare the occlusal outcomes, duration and efficiency of Class I malocclusion treatment carried out with and without premolar extractions in patients with different degrees of initial malocclusion severity.MethodsComplete records of 111 patients were obtained and divided into two groups: Group 1 consisted of 65 patients at an initial mean age of 13.82 years old treated with four premolar extractions; whereas Group 2 consisted of 46 patients at an initial mean age of 14.01 years old treated without extractions. Two subgroups were obtained from each group (1A, 1B, 2A and 2B) with different degrees of malocclusion severity according to the initial values of PAR index. Compatibility was assessed using chi-square and t-tests. The subgroups were compared by means of Analysis of Variance (ANOVA).The variables that might be related to treatment duration and efficiency were assessed using the multiple linear regression analysis.ResultsInitial malocclusion severity was positively related to the amount of occlusal correction and consequently to a higher efficiency index. Moreover, extraction protocol showed a positive relationship with treatment duration and a negative relationship with treatment efficiency.ConclusionExtraction and non-extraction protocols for correction of Class I malocclusion provide similar satisfactory results; however, the extraction protocol increases the overall treatment duration. Orthodontic treatment is more efficient in cases with high initial malocclusion severity treated with a non-extraction protocol.

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Tweed triangle and soft-tissue consideration of Japanese with normal occlusion and good facial profile

Cited by 30 publications

References 9 publications

Morphological evaluations in skeletal Class III malocclusion requiring maxillofacial surgery using orthognathic surgical analysis.

Morphological evaluations in skeletal Class III malocclusion requiring maxillofacial surgery using orthognathic surgical analysis.

Comparative study of dental cephalometric patterns of Japanese-Brazilian, Caucasian and Mongoloid patients

Influence of initial occlusal severity on time and efficiency of Class I malocclusion treatment carried out with and without premolar extractions

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