Evaluation of well-balanced lip position by Japanese orthodontic patients.

Introduction: The purposes of this study were to assess and determine the range of a well-balanced anteroposterior lip position as evaluated by orthodontic patients from a series of varying lip positions in facial silhouettes, and whether the rater's sex and age were factors in the assessment.

Methods: The average profiles were constructed from 30 Japanese male and female subjects with normal occlusion. A series of 13 profiles was developed for males and females, respectively.

Effects of retraction of anterior teeth and initial soft tissue variables on lip changes in Japanese adults.

The aim of this study was to examine the effects of retraction of anterior teeth and the initial soft tissue profile variables on upper and lower lip changes in Japanese adults. Pre- and post-treatment cephalometric radiographs of 33 Japanese female adults (aged 23.0±5.

Influence of gingival display on smile aesthetics in Japanese.

The aim of this study was to evaluate the influence of the amount of gingival display on smile aesthetics as assessed by Japanese orthodontists and dental students. A coloured photograph of a smiling female, displaying the first molar to first molar, whose upper lip was tangent to the upper gingival margin of the upper central incisors (zero point), was constructed from different subjects. Gingival displays were modified by moving the teeth within the lip frame in 1 mm increments, from -5 to 5.

Relationship between the unilateral TMJ osteoarthritis/osteoarthrosis, mandibular asymmetry and the EMG activity of the masticatory muscles: a retrospective study.

The purpose of this retrospective study was to investigate the relationship between the unilateral temporomandibular joint (TMJ) osteoarthritis/osteoarthrosis (OA), mandibular asymmetry and electromyographic (EMG) activity of the masticatory muscles. Twenty-two Japanese women (aged 23.2 +/- 5.

Comparison of the kinetic frictional force between conventional plastic brackets with thermoplastic low-friction module ligation and self-ligating brackets.

Aim: To compare the kinetic frictional force of a conventional plastic preadjusted bracket with thermoplastic low-friction module ligation and a self-ligating bracket.

Materials And Methods: The testing model consisted of four 0.022-inch conventional plastic preadjusted brackets; four 0.

Effects of buccal corridors on smile esthetics in Japanese.

Objective: To test the hypothesis that the amount of buccal corridor has no influence on smile evaluations of Japanese orthodontists and dental students.

Materials And Methods: One photograph of a smiling female, displaying first molar to first molar, was constructed. Buccal corridors were modified digitally in 5% increments, from 0% to 25% buccal corridor compared with the inner commissural width.

Frictional resistance in plastic preadjusted brackets ligated with low-friction and conventional elastomeric ligatures.

Objective: To compare frictional resistance of the plastic preadjusted brackets ligated with the low-friction ligatures with those of the conventional elastomeric ligatures.

Design: In vitro study.

Setting: Department of Orthodontics, Faculty of Dentistry, Kyushu University, Fukuoka, Japan.

Relationship between head posture and dentofacial morphology in patients with TMJ osteoarthritis/osteoarthrosis.

Aim: To test whether there is a relationship between head and cervical posture and dentofacial morphology in patients with temporomandibular joint osteoarthritis/osteoarthrosis (OA).

Methods: The subjects consisted of 34 Japanese females with TMJ OA (aged 24.7 +/- 6.

Mechanomyogram and electromyogram analyses during isometric contraction in human masseter muscle.

Aims: To investigate the relationship between mechanomyogram (MMG), electromyogram (EMG) and bite force during isometric contraction of the human masseter muscle.

Methods: Data were obtained from 16 healthy Japanese males (Mean age: 25.6 +/- 2.

Comparison of anteroposterior lip positions of the most-favored facial profiles of Korean and Japanese people.

Introduction: A consensus on the contemporary perception of beauty might have been developed between different countries because of increased worldwide access to variations in pleasing facial profiles. The objectives of this study were to determine, assess, and compare the ranges of values of the most-favored facial profiles rated by young Korean and Japanese adults.

Methods: Average profiles were constructed from the profiles of 30 Japanese men and women with normal occlusions.

TMJ osteoarthritis/osteoarthrosis and immune system factors in a Japanese sample.

Objective: To determine whether there is an association between temporomandibular joint (TMJ) osteoarthritis/osteoarthrosis (OA) and immune system factors in a Japanese sample.

Materials And Methods: The records of 41 subjects (7 men, aged 22.0 +/- 3.

Relationship of TMJ osteoarthritis / osteoarthrosis to head posture and dentofacial morphology.

Objective: The purpose of this study was to test the hypothesis that there is a relationship between the temporomandibular joint (TMJ) osteoarthritis/osteoarthrosis (OA), head posture and dentofacial morphology.

Design: Case-control study.

Subjects And Methods: The subjects consisted of 34 Japanese females with TMJ OA (aged 24.

Comparison of cephalometric norms between Japanese and Caucasian adults in antero-posterior and vertical dimension.

The aims of this study were to determine Japanese cephalometric norms in the antero-posterior and vertical dimension, and to test the hypothesis that there are racial differences in cephalometric measurements between Japanese and Caucasian norms. Radiographs were obtained from 25 healthy Japanese males (aged 25.1 +/- 2.

Influence of facial convexity on facial attractiveness in Japanese.

Objective: The purpose of this study was to assess and determine the range of the top three most-favored facial profiles for each sex from a series of varying facial convexity, and to evaluate the clinically acceptable facial profiles for Japanese adults.

Design: Questionnaire-based study.

Subjects And Methods: Silhouettes of average male and female profiles were constructed from the profiles of 30 Japanese males and females with normal occlusions.

Comparison of lip positions in ancient Buddhas with Japanese adults.

Objectives: To compare the lip positions found in two ancient Buddha statues with the lip positions in contemporary Japanese adults.

Methods: The facial profiles of Yakushi-ji temple Sho Kannon (male) and Chugu-ji temple Bodhisattva (female), generally considered to be two of the most beautiful Buddha statues in existence, were compared with the facial profiles of 30 Japanese dental students. Profiles of the statues were measured on photographs and profiles of the adults on cephalometric radiographs.

Root resorption and immune system factors in the Japanese.

The objective of this study was to determine whether there is an association between excessive root resorption and immune system factors in a sample of Japanese orthodontic patients. The records of 60 orthodontic patients (18 males, age 17.7 +/- 5.

Anteroposterior lip positions of the most-favored Japanese facial profiles.

Introduction: Soft tissue analysis is a basic tool in planning orthodontic treatment. However, the components of a well-balanced Japanese facial profile have not yet been established. The purpose of this study was to assess the most-favored or most well-balanced profile from a series of facial silhouettes with varying anteroposterior lip positions by a group of Japanese orthodontists and a group of young adult Japanese dental students.

Effect of facial convexity on antero-posterior lip positions of the most favored Japanese facial profiles.

Soft tissue analyses are basic tools in planning orthodontic treatment. However, the perception of a well-balanced Japanese facial profile has not yet been established, particularly with respect to changes in facial convexity. The purpose of this study was to assess and determine the range of antero-posterior (A-P) lip positions of the top three most favored, well-balanced profiles from a series of various facial silhouettes with changing facial convexity.

A comparison and validation of amorphous sensor condylar movement analysis to MRI diagnosis of anterior disc displacement.

This study compared temporomandibular joint condylar movements in a sample of six patients with clinically normal joints, with those of nine patients with joints diagnosed by magnetic resonance imaging (MRI) to have anterior disc displacement with reduction (ADD). The aim of this study was to compare and validate the use of the amorphous sensor to MRI diagnosis in condylar movement analysis. The measuring device consisted of an amorphous sensor and a small magnet.

Frequency spectrum of condylar movement in clinically normal subjects, using an amorphous sensor.

The purpose of this study was to determine the properties of the frequency spectrum produced by condylar movements in normal subjects, by the use of an amorphous sensor. The gender-matched sample consisted of white people (17 males and 17 females, aged 25.8 +/- 2.

Condylar movement analysis in subjects with clinically normal temporomandibular joints, utilizing an amorphous sensor.

The purpose of this study was to determine the range of condylar movements in normal subjects, by the use of an amorphous sensor. The pair-matched sample consisted of 17 Caucasian males (aged 25.8 +/- 2.

Nickel allergy associated with a transpalatal arch appliance.

Aim: The purpose of this article was to present a case in which nickel sensitivity of the oral mucosa was demonstrated during the use of a transpalatal arch appliance (TPA).

Case Report: An 11-year 8-month old post-menarchal female presented for orthodontic treatment with Class III buccal segments and bilateral open bite. The treatment plan consisted of placing a rapid palatal expansion appliance (RPE) and a TPA with soldered lateral tongue cribs, in order to eliminate her tongue thrusting habit.

An aggressive dentigerous cyst in a seven-year-old child.

A review of literature indicates that very few of these cysts are found in children less than ten years of age, in spite of the fact that the cysts are associated with the eruption and/or formation of the secondary dentition. Although dentigerous cysts are rare in the first decade of life, a thorough review of a child's initial radiographs is of obvious importance as indicated by this case report. Of prime importance in this matter is the age at which the initial panoramic radiographic examination is performed on a child.

Changes in tooth position in humans in relation to arterial blood pressure.

The three-dimensional physiological tooth movement synchronized with the heartbeat is called periodontal pulsation. This study utilized a computer-assisted amorphous sensor to evaluate the relation between tooth position and arterial blood pressure, and also between the amplitude of periodontal pulsation and arterial blood pressure. The measuring device consisted of a small magnet attached to the tooth and an amorphous sensor that was used to detect displacement of the tooth without actually contacting it.

An assessment of root cementum in cleidocranial dysplasia.

The purpose of this prospective study was to determine if there is a difference between the amount of cellular and acellular cementum on the roots of 2 teeth extracted from a subject with cleidocranial dysplasia (CCD) compared to 10 teeth extracted from 10 subjects unaffected by CCD. The cementum of 2 permanent teeth, which had been extracted from the CCD subject, was examined and histomorphometrically analyzed for comparison to the cementum of 10 anterior teeth that had been extracted from individuals who were unaffected by CCD. The percentage of the root covered by cellular or acellular cementum was quantified to determine if patients affected by CCD typically lack cellular cementum.