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●齿颚矫正的迷思~6 buccal corridor(颊齿间隙)  

2009-04-25 10:28:23|  分类: 矫正知识与常识 |  标签: |举报 |字号 订阅

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●齿颚矫正的迷思~6 buccal corridor(颊齿间隙)

6)buccal corridor(=Lateral Negative Space “LNS”)颊齿间隙

~~图里的((B-A) / B )buccal corridor

在**里对buccal corridor width有着以下的定义:

buccal corridor width (buk? l kor?id r),

n the negative space between the buccal surface of the maxillary first premolar and the inner point at which the lips join when the patient smiles. It is often stated as a ratio of the inner lip commissure width divided by the distance between the first maxillary premolars.

九种不同的微笑所显现的buccal corridor spaces

Dr. Charles Burstone Common Myths in Orthodontics (里面谈论到buccal corridor)

The smile and buccal corridors (Dr. Burstone reviewed a number of photos to make the following points).

1. Buccal corridors are very prevalent in the smiles of actors and actresses.

2. Their size depends on the amount (width) of the smile.

 3. Their size depends on how the photograph is taken or the view of the face.

 4. Their size depends on the amount of mandibular opening.

5. The width of the dental arches is only one of many factors involved in the presence of buccal corridors during smile.

 The battle for the skeletal modification of the face – maxillary orthopedics

1. Dr. Burstone cited a study by Tanne et al. which showed the treatment effects of maxillary protraction headgear are largely dental with clockwise rotation of the mandible. Tanne K, Sakuda M. Biomechanical and clinical changes of the craniofacial complex from orthopedic maxillary protraction. Angle Orthod. 1991 Summer;61(2):145-52.

2. Dr. Burstone also discussed a case report of maxillary protraction using an implant as anchorage for the protraction. The results showed improvement in lip posture. Cephalometric evaluation showed lingual inclination of the lower incisors from the effect of the chin cap and clockwise rotation of the mandible. No maxillary skeletal effect was seen.

Why is evidenced-based treatment not practiced?

1. Traditions, emotions, beliefs, commercialism, gurus, easy-learning, appliance worship all contribute to the lack of evidenced-based treatment in our specialty.

2. In research, evidence is clouded by sampling methods, traditions, and tendencies to follow authority figures.

3. Epidemiologic data has limits with regard to understanding the mechanism of response to treatment. Scientific understanding of the mechanism is essential to solid evidence-based treatment.

Buccal corridor refers to the dark space (negative space) visible during smile formation between the corners of the mouth and the cheek-side surfaces of the upper teeth.(嘴角与上排牙齿的颊侧面之间所呈现的阴影部份)

Its appearance is influenced by:(它会受到以下的因素而显现不同的情形)

1.              the width of the smile and the upper arch. (微笑的宽度与上颚牙弓)

2.              the tone of the facial muscles. (颜面肌肉的张力)

3.              the positioning of the labial surfaces of the upper premolars. (上颚小臼齿唇侧面的位置)

4.              the prominence of the canines, particularly toward the back of the tooth. (犬齿的突度,尤其是与后面牙齿相比较)

5.              any discrepancy between the value (brightness) of the premolars and the six front teeth. (任何与前面6颗前牙与小臼齿明亮度的差异)

 

Arch form (牙弓型态)has a direct influence on the buccal corridor(会直接影响颊齿间隙). The ideal arch is broad and conforms to a U shape.(理想的牙弓是一U型的形状) A narrow arch is generally unattractive(窄的牙弓通常较不具吸引力). It disrupts the principles of golden proportion(黄金比例) and makes the centrals appear far too dominant.

Patients with very narrow arches(窄的牙弓) may require orthodontics and possibly surgical intervention prior to restoration in order to achieve excellent results. The unattractive, negative space should be kept to a minimum. This problem can be solved or minimized by restoring the premolars. The buccal corridor should not be eliminated completely because a hint of negative space imparts to the smile a suggestion of depth.

The negative space is often accentuated when only the six upper front teeth are restored. The improvements in hue and value of these newly restored teeth often exaggerates the sense of depth, darkness and prominence of the buccal corridor. Because of this concern, it is advisable in some cosmetic cases to include the premolars in the restorative plan.      buccal corridor的差异图例

Three smile styles. A. Cuspid. B. Complex. C. Mona Lisa.

Principles of cosmetic dentistry inorthodontics: Part 1. Shape and proportionalityof anterior teeth

Attractiveness of Variations in the Smile Arc and Buccal Corridor Space as Judged by Orthodontists and Laymen Sanjay Manhar Parekh;a Henry W. Fields;b Michael Beck;c Stephen Rosenstield

Esthetic Influence of Negative Space in the Buccal Corridor during Smiling

Smile Analysis and Design in the Digital Era

Dynamic smile visualization and quantification:Part 2. Smile analysis and treatment strategies

Aesthetic rehabilitation of the worn smile

Eight Tips on Smile Design

齿颚矫正治疗对微笑变化的影响

The Golden RulerA simple device to solve dental esthetic problems

 AESTHETICS Advanced Smile Design Technologies

The importance of incisor positioning in the esthetic smile: The smile arc

Microsoft PowerPoint - FIVE Dev Radio Guide Fully .pptx

ORTHODONTIC WORK-UP FORM(表格)

SMILE Analysis Form

程よいBuccal corridor(頬廊)と口唇とのバランス

The 10 Fundamental Components of a Natural Smile

Esthetic analysis of the smile(Brazilian Journal of Oral Sciences)

Macroesthetic elements of smile design

Macroesthetics: Facial and Dentofacial Analysis(Journal of the California Dental Association)

Advancing the Art of Diagnosis and Treatment Planning Part II

WHEN ANAVERAGE SMILE ISNOT GOODENOUGHby Connie M. Baker D.D.S

NEWS & TRENDS IN ORTHODONTICS

JCO INTERVIEWS Bjorn U. Zachrisson, DDS, MSD, PhD, on Current Trends in Adult Treatment, Part 2

Orthodontic Case Presentation(矫正案例示范)

 Soft-Tissue-Based Diagnosis Treatment Planning

<原稿: http://tw.myblog.yahoo.com/orthodontist-yang/article?mid=5910&prev=5925&next=-1>

 

 

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