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• Metal inlay • Porcelain inlay • Composite resin inlay …………
Indications and contraindications of inlay
① Indications:
1. All kinds of severe dental defect including dental cusp, incisal angle, marginal ridge and occlusal surface which need to be repaired by occlusal reconstruction rather than by filling method.
② Contraindications:
1. The permanent teeth of youth and primary teeth of children are inadvisable to be repaired by inlay because of the high position of pulp corn.
schematic diagram of the preparation of onlay
The wax pattern preparation
Requirements：
• Suitable with the cavity and without any defect.
• Recover the correct anatomical outline, regular border .
The superiority of inlay ：
Compared with the conventional silver amalgam filling, inlay and onlay have excellent mechanical properties and harmonious color. Filling the cavity may reduce the resistance strength by about 50%, however inlay and onlay can increase the resistance strength by about 75%.
▪ Onlay： severe defect, including one or more dental cusps. It covers the occlusal surface and has the function to recover the occlusal relation.
4. According to the manufacture material , it can be divided into :
3. Slice cut can be made on the proximal surface if the defect on the surface is superficial or without good adjunction
3. The use of supplementary retention such as case retention form, dovetail, peg, groove, etc.
4. The preparation of onlay
The retention of onlay mainly depends on the pin hole. The occlusal surface should be reduced by 0.5~1.0mm at least and the onlay should cover all the occlusal surface. The pin hole should be within the dentin with 2mm in depth and 1mm in diameter and all the pin holes should have common path of insertion
Section 3 Inlay
Definition
Inlay is a kind of prosthetic restoration which can be fit into the crown and be used to recover the shape and function of odontodefect
2. Those cases that need recovery of proximal contact point because of food impact.
3. If the abutment of fixed bridge has caries, inlay can be designed to act as the retainer.
are seldom made in China ,but in foreign countries they are often made with the development of luting agent.
Categories of inlay
1. According to the different dental surface recovered by inlay, it can be divided into three categories:
1. No undercut, axial wall has 2°～5°abducface.
2. There are incline plane about 45° in inclination and 1.5mm in width around the cavity border . Purpose
• direct method
• indirect method
• indirect-direct method
The finishing, trying and cementation of inlay
The fabricating procedure of Inlay
The fabricating procedure of onlay
2. Inlay is not suitable for those teeth with superficial defect.
3. Too severe dental defect without enough resistance form and retention.
4. Young patients who have strong desire for the outlook and long-term effect of prosthesis, inlay is not recommended to repair the defect of anterior teeth.
Simple surface inlay
Proximal surface inlay
MOD
MOD
3. According to the degree of defect：
▪ Inlay： similar to filling material, within the scope of dental cusp.
Composite resin inlay
Definition composite resin inlay is made by thermal head-curing or light-curing composite resin. It has the feature of natural color, simple procedure, cheap and suitable for both anterior and posterior teeth
Preparation of inlay
1. The preparation of occlusal inlay
（1）remove the caries （2）preventive extension （3）the formation of retention form
and resistance form
▪ Simple surface inlay ▪ Double surface inlay ▪ Polygon surface inlay
2. According to the position, it can be divided into :
▪ Mesio-occlusal inlay (MO inlay) ▪ Disio-occlusal inlay (DO inlay) ▪ Mesio-disio-occlusal inlay (MOD inlay) ▪ Bucco-occlusal inlay (BO inlay) ▪ Lingo-occlusal inlay (LO inlay)
2. The preparation of proximal surface inlay
（1）occlusal surface: dovetail retention form is required to prevent the horizontal displace. The width of dovetail form isthmus is not more than 1/2 the width of occlusal surface.
The weak point of inlay :
Inlay and onlay are seldom used in dental clinics because of bad retention, long border line, too much cutting of the tooth structure and inconvenient manufacture, etc. Inlay and onlay
• Prevent making the undercut
• All the axial walls must parallel to each other
• Try to reserve the dental structure
Generally speaking, full crown is recommended for those tooth with severe defect
• Recover good occlusal and proximal relation.
• Smooth surface, little residual stress, low creeping, constant volume and constant outline.
The method of wax pattern preparation：
（2）proximal surface: there are two kinds of method :
1）case-form cavity
2）slice cut form
3. The preparation of MOD inlay
The principles are basically the same with those of double surface inlay, but three points must be pay attention to:
The basic principles of tooth preparation for metal inlay
Besides the regular principles of cavity filling such as preventive extension, smooth bottom, vertical wall, clear line angle, there are some peculiar requirements:
Indications and contraindications of inlay
① Indications:
1. All kinds of severe dental defect including dental cusp, incisal angle, marginal ridge and occlusal surface which need to be repaired by occlusal reconstruction rather than by filling method.
② Contraindications:
1. The permanent teeth of youth and primary teeth of children are inadvisable to be repaired by inlay because of the high position of pulp corn.
schematic diagram of the preparation of onlay
The wax pattern preparation
Requirements：
• Suitable with the cavity and without any defect.
• Recover the correct anatomical outline, regular border .
The superiority of inlay ：
Compared with the conventional silver amalgam filling, inlay and onlay have excellent mechanical properties and harmonious color. Filling the cavity may reduce the resistance strength by about 50%, however inlay and onlay can increase the resistance strength by about 75%.
▪ Onlay： severe defect, including one or more dental cusps. It covers the occlusal surface and has the function to recover the occlusal relation.
4. According to the manufacture material , it can be divided into :
3. Slice cut can be made on the proximal surface if the defect on the surface is superficial or without good adjunction
3. The use of supplementary retention such as case retention form, dovetail, peg, groove, etc.
4. The preparation of onlay
The retention of onlay mainly depends on the pin hole. The occlusal surface should be reduced by 0.5~1.0mm at least and the onlay should cover all the occlusal surface. The pin hole should be within the dentin with 2mm in depth and 1mm in diameter and all the pin holes should have common path of insertion
Section 3 Inlay
Definition
Inlay is a kind of prosthetic restoration which can be fit into the crown and be used to recover the shape and function of odontodefect
2. Those cases that need recovery of proximal contact point because of food impact.
3. If the abutment of fixed bridge has caries, inlay can be designed to act as the retainer.
are seldom made in China ,but in foreign countries they are often made with the development of luting agent.
Categories of inlay
1. According to the different dental surface recovered by inlay, it can be divided into three categories:
1. No undercut, axial wall has 2°～5°abducface.
2. There are incline plane about 45° in inclination and 1.5mm in width around the cavity border . Purpose
• direct method
• indirect method
• indirect-direct method
The finishing, trying and cementation of inlay
The fabricating procedure of Inlay
The fabricating procedure of onlay
2. Inlay is not suitable for those teeth with superficial defect.
3. Too severe dental defect without enough resistance form and retention.
4. Young patients who have strong desire for the outlook and long-term effect of prosthesis, inlay is not recommended to repair the defect of anterior teeth.
Simple surface inlay
Proximal surface inlay
MOD
MOD
3. According to the degree of defect：
▪ Inlay： similar to filling material, within the scope of dental cusp.
Composite resin inlay
Definition composite resin inlay is made by thermal head-curing or light-curing composite resin. It has the feature of natural color, simple procedure, cheap and suitable for both anterior and posterior teeth
Preparation of inlay
1. The preparation of occlusal inlay
（1）remove the caries （2）preventive extension （3）the formation of retention form
and resistance form
▪ Simple surface inlay ▪ Double surface inlay ▪ Polygon surface inlay
2. According to the position, it can be divided into :
▪ Mesio-occlusal inlay (MO inlay) ▪ Disio-occlusal inlay (DO inlay) ▪ Mesio-disio-occlusal inlay (MOD inlay) ▪ Bucco-occlusal inlay (BO inlay) ▪ Lingo-occlusal inlay (LO inlay)
2. The preparation of proximal surface inlay
（1）occlusal surface: dovetail retention form is required to prevent the horizontal displace. The width of dovetail form isthmus is not more than 1/2 the width of occlusal surface.
The weak point of inlay :
Inlay and onlay are seldom used in dental clinics because of bad retention, long border line, too much cutting of the tooth structure and inconvenient manufacture, etc. Inlay and onlay
• Prevent making the undercut
• All the axial walls must parallel to each other
• Try to reserve the dental structure
Generally speaking, full crown is recommended for those tooth with severe defect
• Recover good occlusal and proximal relation.
• Smooth surface, little residual stress, low creeping, constant volume and constant outline.
The method of wax pattern preparation：
（2）proximal surface: there are two kinds of method :
1）case-form cavity
2）slice cut form
3. The preparation of MOD inlay
The principles are basically the same with those of double surface inlay, but three points must be pay attention to:
The basic principles of tooth preparation for metal inlay
Besides the regular principles of cavity filling such as preventive extension, smooth bottom, vertical wall, clear line angle, there are some peculiar requirements: