RPD3 Unusual Design

Unusual design, Swinglock, Rotational, Attachments

RPD III (3207-417) 2hr0900-1100 Aug 27, 2010Vichet Chindavanigวเชฏฐ จนดาวณค

Intro. Unusual design

Ordinary RPD uses straight guiding plane directing path of placement and removal.

Some situations where key abutments are insufficient or the available abutments are mobile.

Unusual designs may accommodate retention and reduce RPD component

ฟนปลอมบางสวนถอดไดทวไปใชระนาบน าทเปนเสนตรง ประกอบใชก าหนดทศการใส-ถอดชนฟนปลอม

บางสถานการณ ฟนหลกส าคญมไมพอ หรอฟนหลกซตางๆ นนโยก

ลกษณะออกแบบไมธรรมดานชวยตอแรงยด อาจลดสวน-ประกอบโครงสรางฟนปลอม

Vichet Chindavanig วเชฏฐ จนดาวณค

Objectives

Able to justify which clasp should be applied in certain situations (bar v.s. circumfer.)

Introduction to precision attachments, coping and telescopic dentures

Understanding the indications, contraindications, and how-to for the following design

Rotational: AP, PA, unilateral

Swinglock design


Objectives

สามารถตดสนใจเลอกประเภทตะขอได (ตะขอแทง กบตะขอโอบรอบ) กบสถานการณจ าเพาะหนงใด

แนะน าใหรจก หนวยยดแมนย า ครอบตอฟน และฟนปลอมครอบตอฟน ฟนปลอมครอมหลก

เขาใจ รจกขอบงช ขอหามใชตางๆ และการออกแบบฟนปลอมเคลอนหมน แบบตางๆ ฟนปลอมลอคยดดวยบานพบ


Preamble ปฐมบท

See "The Dentist Of Jaipur" // a funny shortfilm by Falk Peplinski

http://www.youtube.com/watch?v=WR8tIjTykbE 4:40min.

Fact -where socioeconomic and number of qualified

dentists are not sufficient

http://www.youtube.com/watch?v=WR8tIjTykbE













Nature of Complete dentures

Starts from empty space

Retention < ?

Stability < ?

Chewing efficiency < ?


Photos by Jim Collis CDT

http://www.youtube.com/watch?v=jBbZNdUbLJM

C:/Documents and Settings/VAIO/My Documents/My Videos/RealPlayer Downloads/A World of Difference Preview Programme.flv

Nature of Crown & bridges

Cut tooth >

Leak ?

Break ?

Cost ?


C:/Documents and Settings/VAIO/My Documents/My Videos/RealPlayer Downloads/Crown Troughing with PerioLase MVP7.mp4

C:/Documents and Settings/VAIO/My Documents/My Videos/RealPlayer Downloads/Crown Demonstration.flv

Nature of Crown & bridges

Cut natural tooth structures

Good for structural damaged teeth

Decay potential from leaking, open margin, short margin


Blockout die before waxing

Nature of RPDs


Selecting components and designing decision are more difficult than CD, C&B ?

Nature of RPDs / requirements


Placing on both hard and soft tissues

Design > biomechanics ?

Pain free when used ?

Is retention adequate ?

Esthetics ?

Get along with remaining teeth?

Occlusal scheme variation?

จาก Brudvick JS. ADV Rem Partial Dentures. Quintessence Pub.

1999

End results solving problems (RPD) digital technology

Computor aid design (cad)

http://www.youtube.com/watch?v=aSy0P6Sa3C8

2:09min.

http://www.youtube.com/watch?v=XA_i8GCWBp

A&feature=related 2:13min. Investment cost?

Conventional design (various types) from U of

Michigan, an old lecture, but being principles

http://www.youtube.com/watch?v=L0bdNpCZVck&feature=related 47:56min.




















http://www.youtube.com/watch?v=XA_i8GCWBpA&feature=related




http://www.youtube.com/watch?v=L0bdNpCZVck&feature=related




End results solving problems (RPD) wrought wire

The difference between bar clasps and

circumferential clasps (Push-Pull)

Retention, esthetics, nature of mechanics?


การใชลวดรด (wrought wire) กบบางสถานการณ

Vichet Chindavanig วเชฏฐ จนดาวณคPrefabricated connector wire and Ball clasps

การใชลวดรด (wrought wire) กบบางสถานการณ


แถวบน ภาพ Spoon dentures จาก Osborne J, Lamie GA

Partial dentures. 2nd ed, OxfordBalkwell Scientific Publications, 1959

End results solving problems (RPD) :bar clasp

A bar clasp provides more retentive force

than a circumferential clasp (same angle

of convergence, and same degree of

undercut)

Why? Because bar clasp -is a push type

(ชนดดน), circumferential clasp -is a drag type (ชนดดง). ใหเปรยบเทยบกบการเขนลอรถตะกราของรานสรรพสนคา ขามสงกดขวางลกระนาด เขน-ดง ตางกน?


End results solving problems (RPD)


Application of bar clasps


Swinglock removable partial denture

Multiple push type clasp being completely locked by a hinge and latch (บานพบ และขอเกยว)

Do not allow RPD movements



Precision attachments Need more work, tools, precision (less margin of error

and expense


Activating, and attachment removal tools

Nature of its structures


Precision attachments

ด http://www.preat.com/ceka.html

Vichet Chindavanig วเชฏฐ จนดาวณคComplete overdenture

Removable partial denture

C:/Documents and Settings/VAIO/My Documents/My Videos/PREAT Precision Attachments.avi

http://www.preat.com/ceka.html

Attachments - nature


Require abutment restoration – crown,

root cap, root canal treatment, tooth splinting, tooth decoronate (ตดซฟน)

Provide esthetics (no clasp is seen)

Splint abutment (where distal extension is presence or abutments are not strong)

Rotational design


Rotational design

AP, PA, and unilateral design

End result – rotational design

Reducing parts (clasp?)

Not reducing RPD retention (lock?)

Serve esthetics demand (attachment?)


How to make clasp

fit to the abutment ?

How to reduce number of the clasp?

Many clasp?

Nature of RPDs คดทบทวนกอน?

How do they work?

A piece of rigid material

formed into anatomical

structures to which

replacing missing organs.

Arch integrity >

chewing

capability >occlusal

anatomy (Link to

Posselt and computor animation)

RPD ท างานไดอยางไร ชนวสดแขงตรง สรางรปเปน

โครงสรางกายวภาคตางๆ ททดแทนอวยวะสวนทสญเสยไป

โคงขากรรไกรทตอเนอง > ประสทธภาพการบดเคยว

ความสามารถบดเคยว > ขนกบรปกายวภาคฟน

ดการเคลอนขากรรไกร 0:46min.

http://www.youtube.com/watch?v=9rA7VPUQqPQ


C:/Documents and Settings/VAIO/My Documents/My Videos/So do Posselt2.flv

C:/Documents and Settings/VAIO/My Documents/My Videos/So do Posselt2.flv
















End Part 1


Rotational designremovable partial denture

Part 2; In detail

ฟนปลอมบางสวนถอดไดเคลอนหมน


Objectives

Understand the principles, classifications

Indications and advantages

Techniques in clinical and laboratory

Apply factual knowledge to general design


Principles

Utilize undercut at proximal surface of

abutment teeth as retentive area for rigid

proximal plate. This undercut and

projection of metal part will provide

reasonable retentive force to RPDs.

Eliminate and reduce unnecessary conventional clasps.


Classification; rotational design

posterior teeth

placement AP, P

anterior teeth

placement

unilateral

ใสฟนหลง หมนหนา-หลง, หมนหลง-หนา

ใสฟนหนา ใสซกเดยว


หลกการ –ใชกบจ าแนกเคนเนดท 3

AP, PA เหมาะกบ Kennedy class III,

modification 1 ทลกษณะชองวางสมมาตรกน มฟนหลงซสดทายลม

Unilateral เหมาะกบ Kennedy class III ทไมมชองวางทสอง

Missing anterior teeth-no clasp at abutment next to the spacing


หลกการ -ใชสวนคอดดานประชดของฟนลมยด

ขากรรไกรลางซสดทายไมตองมตะขอ


Ordinary RPD

Rotational design

เมอใชใสฟนหลง ขากรรไกรบน

จากเอกสารของ Krol, Finzen –ขาพเจา มความเหนแยงวา ธรรมชาตฟนกรามซบน มกมสวนคอดดานไกลกลางนอยไปหรออาจไมพอ ควรโอบตะขอจากดานไกลกลางจบพนทคอดดานใกลกลาง การเหนแยงนอาจน าไปสแบบโครงสรางทดกวา ดงลกษณะตะขอทภาพสไลดท 16 บนขวา


Unilateral - ใสฟนซกเดยว

มตะขอตวเดยว ซฟนประชดเหงอกวางไมมตะขอ

ใชสวนคอดทดานไกลกลางฟนหนา, ดานใกลกลางกรามนอย ใชแผนประชด (proximal plate) เขาจบพนทคอดคอฟน

Unilateral rotational RPDOne clasp retained RPD


เมอใชใสฟนหนา ขากรรไกรบน

ไมมตะขอทฟนเขยว, ใชสวนคอดดานประชดเหงอกวาง แผนประชดเขายดในพนทคอดกอน, ตะขอโอบรอบทฟนกราม

จงใสลงเขาทภายหลง



Some modification areas and abutments

adjacent to those modification areas may

not have proper contour for conventional

clasps.

Anterior edentulous area and abutments

next to those areas may not suitable to

place conventional clasps, because it is contradictory to esthetics of the patient.



Reduction of clasps will affect directly to

esthetics, amount of plaque adhesion to

abutment tooth.

Without addition modification for retentive

areas as conventional clasp, tooth

structure is preserved.


Techniques in clinical and laboratory

Indicate and measure the amount of

undercut on proximal area of abutment

tooth

How…


Clinical and laboratory techniques

Indicate and mark tripod that relates to

path of placement in two different marks.

Measure amount of undercuts

Alteration of tooth contour in a duplicate

cast before working in patient’s mouth

Laboratory instruction and order form


Rotational design

Example


References/further reading

Removable partial dentures with rotational paths of insertion: Problem analysis. Firtell D., Jacobson T. E., JPD 1983 July, Vol. 50 No.1, pp. 8-15

Rest seat designs for inclined posterior abutments: A photoelastic comparison. Sansom B., Flinton R.J., Parks V.J., Pelleu Jr. G. B., Kingman A. JPD. 1987 July, Vol.58 No.1, pp. 57-61



Dual-path design for removable partial dentures. King G. E. JPD 1978. Apr., Vol.39, No.4, pp. 392-395

Rotational path removable partial denture design. Jacobson T. E., Krol A. J., JPD 1982. Vol.48, No.4, pp. 370-376

Satisfying esthetic demands with rotational path partial dentures. JADA 1982. Sept.,Vol.105, pp. 460-465



A new clasping system for unilateral distal

extension removable partial dentures.

Garver D. G., JPD. 1978, Mar.,Vol.39, pp.

268-273

Cosmetic and removable partial dentures-

The Class IV partially edentulous patient.

Zarb G. A., Mackay H. F., JPD 1981 Oct.

Vol.46, No.4, pp. 360-368



Design variations of the rotational path

removable partial denture. Schwartz R. S.,

Murchison D. G., JPD 1987, Sept. Vol.58, No.3, pp. 336-338


Int J Prosthodont. 1988 Jul-Aug;1(1):17-27.Rotational path removable partial dentures: Part 1. Replacement of posterior teeth.Krol AJ, Finzen FC.

http://www.ncbi.nlm.nih.gov/pubmed?term=%22Krol%20AJ%22%5BAuthor%5D

http://www.ncbi.nlm.nih.gov/pubmed?term=%22Finzen%20FC%22%5BAuthor%5D

Int J Prosthodont. 1988 Sep-Oct;1(2):135-42.Rotational path removable partial dentures: Part 2. Replacement of anterior teeth.Krol AJ, Finzen FC.

http://www.ncbi.nlm.nih.gov/pubmed?term=%22Krol%20AJ%22%5BAuthor%5D

http://www.ncbi.nlm.nih.gov/pubmed?term=%22Finzen%20FC%22%5BAuthor%5D

ขอคดเหน

แนวคดเรองสวนพก (เรสท) ขนาดยาว ท าใหเสยเนอฟนมาก แตขอดนนจะไดจดหมนทไกลจากสวนคอด

แนวคดเรองสวนพกทลก ท าใหเสยเนอฟนมาก แตขอดนนจะไดระนาบน า (guiding plane) จากความลก

แนวคดเรองขยายสวนพกเปนรปดอกจก (ไพปอก) ท าใหเสยเนอฟนมาก แตขอดนนจะใหการโอบลอม (encirclement)

ภายในซฟน


Swing-lock design

Part 3; In detail

ฟนปลอมลอคยดดวยบานพบ


Objectives/contents

Principle of the design

Indications/advantag-es

Contraindication/dis-advantages

Clinical techniques

Laboratory techniques

Lab-dentist communication

ใชตะขอแทงหลายตว แขงตรง เหมาะกบกรณฟนหลกนอย ไม

แขงแรง ขาดหลกส าคญ ไมเหมาะกบผดแลความสะอาด

ไมด สามารถทางมอต า ความงามไมด

ใชบานพบ และขอเกยว ก าหนดต าแหนงชดเจน วาดภาพ

ตรวจโครงขผงกอนเหวยงโลหะ


Principles of the design

Form and component parts

Consist of latch and hinge, with labial bar

that has multiple bar clasps

Major connector is a lingual plate

Multiple rest seats

May consisting with other clasps if there are modification space(s)





เปนฟนปลอมบางสวนชนดถอดไดโครงสรางเปนโลหะหลอ มแผนดานลนและดานเพดาน มแทงโลหะดานขางแกมหรอรมฝปาก (LABIAL BAR) ทเปดปดไดดวยบานพบ และจะมตะขอในรปของตะขอแทง (BAR CLASP) ตอตงฉากขนมาจากแทงโลหะดานขางแกมหรอรมฝปากนน การลอคยดแทงโลหะทท าหนาทเปนหนวยยดหลก (DIRECT RETAINER) เกดขนโดยหวเกยว (LOCK) ยดกบ สลก (LATCH) ซงยนออกมาจากโครงสรางของโครงยด (RETENTIVE FRAMEWORK)


Examples

Multiple rests may required for maximum support.


Examples

Without regular recall & check-up,

resorbtion of edentulous ridge will cause damages to remaining teeth.


Examples

Left fig. Inner part while hinge is open

Note: no metal contact to teeth

Right fig. Long clinical crowns

--------------------- Candidate for labial flange


Examples

Demonstrate esthetics modification to labial arch bar


Examples


Examples

Maxillofacial defect cases are indicated for

swinglock, if maximum retention is

required. Conventional RPD design may

not suitable to the prosthesis if retentive force does not meet requirement.


ไมใชกบเดก

Examples

If the labial bar is flexible, can be twisted;

retention will not obtain from hinge and

latch. If hinge is too loose I-bar struts will not hold the partial.

labial bar lack of rigidity will not serve Vichet Chindavanig วเชฏฐ จนดาวณค

Indications/Advantages

Lack of appropriate

retention, good tooth

contour

Abutments mobility

Missing key

abutments

Unfavourable soft

tissue contour

Economics

Tooth prognosis is questioned

ขาดพนทสวนยดทเหมาะสม ฟนหลกโยก ขาดฟนหลกส าคญ รปทรงเยอออนไมด ปจจยเศรษฐกจ ผลพยากรณโรคของซฟนยง

เปนปญหา


Contraindication/disadvantages

Shallow vestibule: for labial bar

High esthetics demand

Homecare :poor motivation cases

ด หนงสอการประชมวชาการทนตแพทยสมาคมแหงประเทศไทย 19-21 ธ.ค.2527 การใสฟนสวงลอคส าหรบอารช ทมปญหา โดย รศ.ทญ.โสภ ชาตสทธพนธ หนา 50-57


Clinical techniques

Requirements

1.Indicate, mark necessary anatomical landmarks on diagnostic model

Technique…?

2.Periodontal therapy should bring back healthy supporting tissues

3.consider, plan for other restorative works

Crown, additional retentive area by tooth alteration


Impression for framework

1.with a stock tray -must be taken with special care. Make sure that vestibular depth is correct and other movable tissue is not distort.

2.with an individual tray

Compare the two techniques

Select 1.or 2.on different occasion, and different objectives


Dental prescription Lab order form

Inscribe with pencil line on master model :

for framework design

Write and draw design detail on paper


Poor impression, Insufficient labial vestibule detail

Failures

Necessity of giving information to patient

before start making swinglock rem. partial

denture.

Necessity for good homecare

Necessity for periodic recall: evaluation

and frequency of relining


Attachments for RPDsand overlay prostheses

Part 4; in detail

หนวยยดแมนย า และฟนปลอมครอมหลก


Definition

Attachment = A mechanical device for fixation, retention and stabilization of a dental prosthesis.

Overlay = 1.If something is overlaid with something else, it is covered by it. 2.If you overlay one type of behavior, attitude or idea with another, you add one to the other, often in a superficial way.

From - CollinsCOBUILD English Dictionary


Objectives

Provide basic background of

1.attachments 2. overlay dentures and 3.telescopic crowns in prosthetic dentistry

Familiar with technical terms in attachment, overlay denture and telescopic crown

Inform alternative means for prosthetic dentistry… understand how the systems work


Contents

Why use attachments, telescopes

Classification

Nature of each type

Clinical techniques

Laboratory techniques


Why use attachments, overlay, or telescopic crowns

Initiative from 1. for esthetics requirement.

Why?

Because patient demanded no clasp

appearance from removable prosthesis.

Others are … 2. for correction, addition,

prevention, preservation, or preparation for prospect future plan.


Reasons for the use of attachments

Correction & Addition of retention, support, stability, esthetics

Prevention & Preservation of remaining structures, preserve sensory output from periodontal ligaments, preventing possible damage to the remaining structures

Preparation for future; some abutments may terminate… new prosthesis may not require, due to modification plan


General classification

Precision (แมนย า) or semiprecision (กงแมนย า), depending on method of

fabrication and tolerance to the fit.

According to their relationship to the abutment teeth, they can be classified as intracoronal and extracoronal attachments.

According to shapes – strut (ตม), bar (แทงคาน)


Introduction to form of attachments

Crowned abutment & RPD with

attachment (splinting is optional, การดามยดฟนหลกเปนทางเลอก)


Ceka

Introduction to the form of

overlay prostheses

Removable prosthesis placed over the reduced abutments (height)

Bar Coping & overlayVichet Chindavanig วเชฏฐ จนดาวณค

Classification (attachments)

Classified by force directed, movements,

shapes, or means of attaching between

two parts

Rigid (แขงตรง) and Non-rigid (resilient) (หยนตว) Bar (แทงคาน) and Stud (ตมยด) Mechanical force (แรงยดเชงกล) and magnet

force (แรงยดแมเหลก)


Classified by position

Classified by location of attachment

(Relation to tooth circumference)

Intra-radicular: within tooth circumference

Extra-radicular : outside tooth

circumference (consider as cantilever,

extension, projection)

So called :intra-coronal (ในกรอบซฟน), extra-

coronal attachments (หนวยยดนอกกรอบซฟน)


Classified by mobility

Rigid type Non-rigid type (resilient)


Classified by form

Bar แทงคาน Stud ตมยด


Variations

Mechanical แรงยดเชงกล

Non-mechanical > Magnet

ไมใชกลไกเชงกล ใชแรงแมเหลก


Rigid & Non-rigid attachments

Rigid attachment: does not allow any

movements of removable prosthesis.

Non-rigid attachment: allow certain degree and specific direction of movements.

Non-rigid ขยบได Rigid แขงตรง ขยบไมได


Rigid attachment: no movementsallowed to the prosthesis

Why? - Splinting abutment

Chewing efficiency is not reduced, strong.

Application to removable partial denturesVichet Chindavanig วเชฏฐ จนดาวณค

Rigid attachment: no movements allowed to the prosthesis.

When & where

Abutments are strong, healthy, well

maintain, good prognosis

Rigid type แขงตรง ขยบไมได Vichet Chindavanig วเชฏฐ จนดาวณค

Rigid attachment: no movementsallowed to the prosthesis

Why?

Application to Cr&Br work - non-parallel

abutment


Rigid & non-rigid

Resilience attachment (หนวยยดหยนตว) allows certain degree and specific direction of movements.

Resilient type ขยบได หยนตวได Vichet Chindavanig วเชฏฐ จนดาวณค

Non-rigid

Why movements are allowed?

To reduce torque and leverage forces to the supporting abutments.


Bar แทงคาน & Stud ตมยด

Bar provides rigid splinting among

abutments, Stud provides freedom of

minor (natural) movements to each abutment


Bar attachments

Classified by rigid & non-rigid action to

prosthesis

Rigid type : called “bar unit”

“แทงตรง” ขยบหมนไมได

Non-rigid type : called “bar joint”

“แทงขอตอ” ขยบหมนได


Selection of attachments

Indication for use depending on dentist

decision

Decision making is based upon purpose,

the action of prosthesis to abutments

Factors influence to decision are… cost,

availablility in local lab, dentist-technician

dexterity, esthetics, maintenance, situation of abutments and soft tissue etc.


Rigid & Non-rigid bars

Bar unit

Number of

abutment

Usually four

teeth at

appropriate

pattern of distribution

Bar joint

Number of

abutment

Usually two teeth splint together


Bars : Nature

Direct &control forces

Reduction of lateral forces to shortened abutments

Splinting, stabilization

Improve esthetics (mal-aligned tooth)

Require tooth preparation, invasive Tx?

May need RCT (intentional, or abutment is a RCT tooth)

Direction of root canal may cause technical difficulties


Possible solution


See - http://www.sterngold.com/Sterngold/attachments/index.aspx?catId=01

http://www.sterngold.com/Sterngold/attachments/index.aspx?catId=01

http://www.sterngold.com/Sterngold/attachments/index.aspx?catId=01

Studs : Nature

Less problems with remaking prosthesis if one abutment terminates

Selectively activate retention on each abutment

Splinting,

stabilization to

multiple abutments

are only from

prosthesis

High risk : if only

single tooth remain in an arch


Studs : Nature

Allow free movement to each abutment tooth (conditioning) with spacer placement

Use spacer during cementation of attachment to rem. prosthesis

Require a spacer


Studs : Nature

With a spacer: allow tooth and ridge support

Remove spacer, and check clearance

ใชแหวนรองขณะยดหนวยยดแมนย า และเอาออกเมอใชงาน

Require a spacerVichet Chindavanig วเชฏฐ จนดาวณค

Ceka

Rem. Prosthesis must be in used (pre-function) for a

period of time. It is to ensure dynamic changes of softtissue supporting base.


Ceka

Studs : Nature

This design (from fig.)

Without a spacer: it is

total tooth supported

Require multiple

numbers, reinforced

bridge structure, and

need appropriate

abutment distribution


See -Precision Attachments in Prosthodontics: Overdentures

and Telescopic Prosthesis [Hardcover]Harold W. Preiskel (Author)

Ceka

http://www.amazon.com/s/ref=ntt_athr_dp_sr_1?_encoding=UTF8&sort=relevancerank&search-alias=books&field-author=Harold%20W.%20Preiskel

Studs : Nature

Less problems with

remaking prosthesis if

one abutment

terminates (extracted)

Selectively activate

retention on each abutment

Four attachments were activated for retentive force.

If any one of these abutment were terminate, other cantooth will be activated, replacing retentive force.


Ceka

Require pre-function of removable prosthesis,before direct installing the attachments to denture.


Milling machine

Two or more studs require accurate locating techniqueby high precision dental surveyor. It is the use of

milling machine. (เครองกลง กรอตดเชงขนาน)Vichet Chindavanig วเชฏฐ จนดาวณค

milling machine

Dentist’s requirements

Need special tools to remove, activate retention, and deactivate retention

Activating tool

อปกรณ ลด-เพมแรงยดTightening - Removing tool

อปกรณ ไขแนน-หมนถอด

Rider on bar attachment is of different material

Differ in color? Differ in retention

Riders

รางฝง

Holder

ทจบเปลยน อปกรณใสหนวยยด

Clip

หนวยยดVichet Chindavanig วเชฏฐ จนดาวณค

Bar joint : movable

Distal ends move tissueward

Axis of rotation to denture is importance to

equal distribution of leverage force acting

to abutments (two abutments joined with bar).


Level of each abutment should allow bar connector

run parallel to the occlusal plane (to equilibrate forcesdirected to supporting ridges).

Bar joint : movable


Parallel to occ. plane

Implant supported bar unit

Inter-arch spacing and height of bar unit

affect directly to the difficulties in tooth set-up, and strength of the denture.


Vichet Chindavanig วเชฏฐ จนดาวณคก าหนดต าแหนงขนาน วางต าแหนงสมพนธกบซฟน

Ceka attachment

Lab & Clinical technique

Fabricate crowns and RPD frame in one visit.Dentist should attach male parts intra-orally.

Ceka attachment


Ceka attachment

Problem with size and

gingival hygiene, new designswere introduced to EU market.


Ceka attachment

Homecare

Better access with

brush.

Classified tooth height

by different angles

30, 45, 60 degree.


Fixing a retentive unit

Using self-cured resin

ใชเรซนบมแขงเองไดยด Snap-on

ใชการแนบยดกบชองโพรงทเตรยมไว


Magnet: what to consider

Magnet & keeper

Force, shape & size,

Magnet half life, corrosion

Vichet Chindavanig วเชฏฐ จนดาวณคSee- New Magnetic Applications in Clinical DentistryAuthor(s)/Editor(s): Ai, Minoru/Shiau, Yuh-Yuan

Overlay,Telescope: Nature

Save periodontium

(case of improper

Cr:Root ratio length)

Prolong life time of

abutment

Preserve proprioception

Require tooth

preparation, invasive

Tx?

May need RCT

(intentional, or

abutment is a RCT tooth)


Filled with amalgam

Coping classification -Short, medium, long copings

Left dome-shaped coping, right thimble-shaped coping


Selecting the form

is mostly

depending on tooth condition.

Vichet Chindavanig วเชฏฐ จนดาวณคครอบตอฟน ครอบรากฟน

Telescopes crowns ครอบสองชน

Primary crown

Secondary crown

(telescope crown)

Role of guiding plane to retentive force


Fabrication techniques

Wax-cast 1, Wax-cast 2

Wax-cast 1, Electroformed 2 ขนรปดวยไฟฟา


Resistance form รปทรงตานแรงระนาบ, แรงกระท าดานขาง


Overlay removable removable partial denture

lying over primary crowns (or copings)

ฟนปลอมถอดไดครอบทบซอนครอบฟนOverlay bridge lying over primary crowns (or copings)

สะพานฟนครอบซอนครอบฟน


หากขาดการดแลฟนหลกทด ไมนานการผเสยหายเกดขนควรใช ครม แสตนนสฟลออไรด เปนประจ าทาทบตอฟนปองกนผ

Interim overlay RemovablePartial denture

ฟนปลอมบางสวนถอดไดครอมทบชนดใชชวคราว

Vichet Chindavanig วเชฏฐ จนดาวณคฟนสกระดบวกฤต สญเสยมตดงสบฟน


End Document

เมอเปลยนเปนงานตดแนนชวคราว

RPD3 Unusual Design

Documents

require tooth

tooth circumference

retentive

wrought wire

labial bar

crown amp

primary crowns

bar joint