1) The angle of wire entry into the bracket slot, known as the angle of entry, determines the moment of force and can have significant clinical implications.
2) A large angle of entry, such as from a distally tipped canine, can cause unwanted intrusion or extrusion of teeth due to the moment of the couple.
3) Bracket positioning can be used to compensate for unwanted moments and forces from the angle of entry, such as placing anterior brackets more gingivally to prevent bite opening.
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Maxillomandibular elastics (or intermaxillary elastics) are commonly used because of their simplicity; however, a lack of understanding of their force system can lead to many serious problems.
Elastics are usually classified by the direction of the force (eg, Class II or Class III elastics).
Sometimes force magnitude is considered, but point of force application is left out. Therefore, many different types of Class II elastics can be applied. There are short or long elastics.
Often too many elastics are used when a single resultant elastic at the correct location would work better. However, sometimes more than a single elastic is needed when the attachment point is not directly accessible.
All maxillomandibular elastics and their actions should be analyzed in three dimensions.
Description :
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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Maxillomandibular elastics (or intermaxillary elastics) are commonly used because of their simplicity; however, a lack of understanding of their force system can lead to many serious problems.
Elastics are usually classified by the direction of the force (eg, Class II or Class III elastics).
Sometimes force magnitude is considered, but point of force application is left out. Therefore, many different types of Class II elastics can be applied. There are short or long elastics.
Often too many elastics are used when a single resultant elastic at the correct location would work better. However, sometimes more than a single elastic is needed when the attachment point is not directly accessible.
All maxillomandibular elastics and their actions should be analyzed in three dimensions.
Description :
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
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Việc đánh giá tương quan của hàm trên với hàm dưới có ý nghĩa quan trọng trong chỉnh hình răng mặt, nó đóng vai trò quyết định trong việc chẩn đoán, lên kế hoạch điều trị và tiên lượng kết quả sau điều trị. Chính vì vậy, rất nhiều tác giả trên thế giới đã cố gắng nghiên cứu để tìm ra phương pháp nhằm đánh giá chính xác mối tương quan này và phim chụp tele từ xa sọ nghiêng (phim cephalometric) là một công cụ không thể thiếu để đánh giá sọ mặt theo chiều trước sau.
Phim cephalometric bắt đầu được giới thiệu và sử dụng trên lâm sàng bởi B. H. Broadbent [1] từ sau đại chiến thế giới lần thứ nhất, kể từ đó nhiều phân tích như Bjork [2], Down [3], Steiner [4], Ricketts [5]…đã được đưa ra để trợ giúp các nhà lâm sàng. Tất cả các phân tích này đã được tạo ra để phân tích đặc điểm về cấu trúc xương, răng và mô mềm. Một trong những phương pháp được sử dụng rộng rãi nhất và đơn giản nhất để xác định tương quan theo chiều trước sau của xương hàm trên và xương hàm dưới là góc ANB.
Góc ANB được đề ra bởi Riedel [6] năm 1952 và được sử dụng trong phân tích của Steiner [4], đây là một trong những số đo trên phim cephalometric được sử dụng phổ biến nhất và đơn giản nhất trong việc đánh giá tương quan giữa xương hàm trên và xương hàm dưới theo chiều trước sau. Tuy nhiên góc này lại bị ảnh hưởng bởi nhiều yếu tố như: vị trí theo chiều trước sau của điểm Nasion, đường S-N, và tác động xoay của xương hàm… [7],[8]. Chính vì vậy, trong nhiều trường hợp, góc ANB không đánh giá được chính xác tương quan xương hàm trên và xương hàm dưới. Jacobson [9] đã nhận ra điều này và đã phát triển một phân tích để vượt qua hạn chế của góc ANB, đó là khoảng cách AO-BO hay còn gọi là phân tích Wits. Kể từ đó, nhiều nghiên cứu đã được thực hiện để đánh giá hiệu quả của phân tích Wits trong chẩn đoán ban đầu và sau khi điều trị, cũng như để thiết lập giá trị Wits ở các chủng tộc người khác nhau. Tuy nhiên, ở Việt Nam hiện nay chưa có nghiên cứu nào được thực hiện để đánh giá hiệu quả của phân tích này. Vì vậy chúng tôi đã tiến hành thực hiện đề tài: “Nhận xét đặc điểm góc ANB và khoảng cách AO-BO ở bệnh nhân lệch lạc khớp cắn theo chiều trước - sau tuổi từ 18-25” với hai mục tiêu sau:
1. Nhận xét đặc điểm của góc ANB và khoảng cách AO-BO ở bệnh nhân lệch lạc khớp cắn theo chi
History and evolution of edgewise appliance.Sneh Kalgotra
The history of edgewise is interesting because of Tweed's decision to support extraction despite keeping his promise to his mentor Angle for 42 years of his professional life.
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ACTION AND REACTION in orthodontic movements.pptxMaen Dawodi
The third law of Newton applies in almost all orthodontic movements; the law of Action and Reaction, which states that to every action there is always opposing and equal reaction.
Sometimes the reaction to a movement results in an unwanted movement.
An example of the third law of Newton when we want to align extruded or intruded teeth , the same force produced to make these movements will be applied on the surrounding teeth provoking a movement in opposite direction to the one we want to produce.
An example of the third law of Newton (Action and Reaction) would be when we want to distalize a molar with NiTi open
coils. The molar distalization is accomplished, but the same force applied backwards to distalize is applied on the buccal segment, not only provoking distalization and molar tipping, but also proclination of the buccal segment.
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Frictionless Mechanics in Orthodontics
In frictionless mechanics, teeth are moved without the brackets sliding
over the archwire.
Retraction is accomplished with the help of loops or springs.
Definition: The ideal tooth extraction is painless removal of the whole tooth or tooth root with minimal trauma to the investing tissues so that the wound heals uneventfully and no post operative prosthetic problem is created.
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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Similar to Angle of wire entry in orthodontic treatment (20)
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How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
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15. “Moment of a Couple”
• Rotation resulting from the moment of the
couple is responsible for many tooth
movements
• This rotation can affect one tooth or a group
of teeth
24. Angle of entry can be affected by:
• Tip in the bracket (angle of bracket slot)
• Tipped teeth due to malocclusion
• Bend in the wire
• Combination of all three
26. Concepts to remember
• Greatest angle of entry produces greatest
moment of couple
• The canine bracket, especially on the upper,
has the most tip built in. Therefore, greatest
angle of entry is most often at the canine
bracket.
• Large variations in canine position are often
present pretreatment. This can also result in
large angle of entry changes
27.
28. Assume a fully bracketed maxillary arch
What effect does a straight wire have on the incisors in each of
these illustrations?
Remember Dr Prittinen’s angle of entry concept
R
R
L
L
30. Assume a fully bracketed maxillary arch
What effect does a straight wire have on the incisors in each of
these illustrations?
Remember Dr Prittinen’s angle of entry concept
R
R
L
L
31. R L
The incisors will cant running downhill right to left.
R
L
The incisors will cant running downhill left to right.
36. What happens?
• Combining the distal tipping of the tooth with the tip
built into the bracket produces a VERY LARGE angle
of wire entry.
37. Implications
• Extrusive force on the anteriors (expressed due to
small root surface area)
• Intrusive force on posteriors (not expressed due to
large root surface area, and because posterior
intrusion is tough to do)
38. Net effect
• Bite deepens and becomes very difficult to
open
• Intrusive and extrusive forces produced as a
result of the moment of the couple results in
tendencies for some teeth to flare and some
to roll in lingually
39. Intrusive/Extrusive force results
• Vertical forces
– Extrusive forces create the potential for LINGUAL
crown tipping
– Intrusive forces create the potential for BUCCAL
(or LABIAL) crown tipping
44. Moment of couple on canine
(greatest angle of wire entry)
• Creates extrusive force
on the incisors
• Intrusive force on the
molars
• Distally inclined cuspid
crowns present a big
mechanical problem
55. Another solution
• When angle of entry will be a problem, start
the case by not bracketing the 4 anterior teeth
– 6543-----3456 are bracketed
• The angle of entry can’t affect anterior teeth if they are
not engaged
• Align the canines (this will take 3-4 months)
then after canine angulation is more ideal,
bracket and engage the anteriors.
60. Does angle of entry make bite easier or
more difficult to open?
61.
62.
63.
64.
65. How can this be controlled?
• Brackets could be positioned to negate these
effects if desired.
• Horizontal, as well as vertical position of slot
could be altered.
66. Effect of vertical forces
• Remember the moment
• Extrusive forces result in lingual crown
movement
• Intrusive forces result in facial (or buccal)
crown movement
67. Another example
Q#1. Does the greatest angle of entry encourage an intrusive or
extrusive force on the upper anteriors?
Q#2 Would you expect flaring or de-torquing of those upper
anteriors?
68. Another example
Q#1. Does the greatest angle of entry encourage an intrusive or
extrusive force on the upper anteriors? (Intrusive)
Q#2 Would you expect flaring or de-torquing of those upper
anteriors? (Flaring due to moment of the intrusive force)
69. 3 months later
• Is what happened to the upper anteriors
predictable?
79. To summarize…
• The extrusive force
imparted to the incisors
because of the moment
(rotational tendency) of
the couple (angle of
entry on the canine
bracket) results in
lingual crown
movement.
80.
81.
82.
83.
84.
85.
86.
87.
88.
89. If distally positioned canine crowns
result in bite deepening…
What happens with mesially inclined
canine crowns?
93. • Open bite tendency
with mesially tipped
canine crowns
• This bite may open
excessively
94. Management
• Encourage mesial root
movement of cuspid
with mesio-gingival slot
angulation
• Discourage bite opening
by gingival bracket
placement in anteriors
(Question: Did I do
this?)
96. • Open bite tendency
with mesially tipped
canine crowns
• Again, the bite could
open excessively
without modifications
to bracket positioning
97. Summary
• Positioning the slot to attain proper root
angulation may increase the already large
angle of entry
• If the greatest angle of entry is working
against you, change the inciso-gingival and/or
mesio-distal position to offset the angle of
entry effect, or consider modifications to
initial bracketing protocol
98. Summary, continued
• Use bite opening or bite closing techniques
after root alignment or
• If you expect angle of entry side effects to be
severe, do not bracket anteriors until after
canines are uprighted, or use spring system as
previously described
99.
100. Bracketing Concept
• In the 1960’s, the best orthodontics was done
by the best wire benders. Today, the best
orthodontics is done by the best bracket
positioners.
• Vertical control by bracket positioning….
101. Anteriors; inciso-gingival placement
• Deep bite patients
– Position brackets 1 to 2 mm incisal to the center
of the tooth
• Open bite patients
– Position brackets 1 to 2 mm gingival to the center
of the tooth
103. Premolars- inciso-gingival placement
• Deep bite cases
– Position brackets 1 to 2 mm gingival to the center
of the tooth
• Open bite cases
– Position brackets 1 to 2 mm occlusal to the center
of the tooth
105. Concept
• Step 1-Identify greatest angle of entry
• Step 2-Vertically position brackets to
compensate for this, if necessary
106.
107. Rule
• If I want the root to move to the distal, angle
the slot disto-gingivally.
• If I want the root to move toward the mesial,
angle the slot mesio-gingivally.
108. Hands-on demo
• Step 1- Outline 2nd bicuspid and “move” it (this
represents pre-treatment position)
• We now want root to move to distal, and crown to
mesial.
113. Bone Anatomy
• Thick cortical plate
around canines make
them the slowest
moving teeth
• Angle of entry is most
critical here
• Tip: palpate canine
eminence to determine
difficulty of movement
115. Management
• Encourage mesial root
movement of cuspid
with mesio-gingival slot
angulation
• Discourage bite opening
by gingival bracket
placement in anteriors
118. Questions
• What will happen
during initial leveling
and aligning?
• What 2 things could you
do to prevent this?
119. If angle of entry issues are not recognized, excessive bite opening will occur. To
prevent this from happening, do not bracket the canines at the initial appointment.
Also, compensate for bite opening by placing the anterior brackets gingivally.
145. Indiscriminate leveling and aligning will cause
occlusal plane canting. To prevent this, do not place brackets on
the upper incisors until after the canines are uprighted.
160. Questions
• Is this the expected
treatment response?
• Could anything have
been done to prevent
this? Explain.
161. Questions
• Is this the expected
treatment response?
• Could anything have
been done to prevent
this? Explain.
• This is the expected
response. Bracket
positioning and
bracketing scheme should
have been altered to
compensate for angle of
entry issues.