This document discusses pontic design and finish line types. It defines four main types of mucosal contact pontics: ridge lap, modified ridge lap, conical, and ovate pontics. It also defines two non-mucosal contact pontics: sanitary and modified sanitary pontics. The document describes the proper design of each pontic type and their indications. It then defines the finish line as the line of demarcation between prepared and unprepared tooth structure. Six main types of finish lines are described: feather edge, chisel edge, chamfer, shoulder, shoulder with bevel, and sloped shoulder. The shoulder finish line is recommended for all-ceramic restorations.

1. Pontic design and finish line
by
Dr:Mohamed gamal Hussein
lecturer of fixed prosthodontics
faculty of dentistry
Assuit university

2. Questions:

1-identify different types of pontic and discuss sanitary type
2-describe the proper design of pontics.
3-enumerate mucosa contact pontics and discuss one of them .

4- define f.l ,enumerate types of finish line and discuss shoulder finish
line.

3. Mucosal contact pontic design
1-ridge lap (saddle)

-its concave fitting surface that overlaps the residual ridge buccolingual

-it should be avoided because it permits plaque accumulation with difficult
application of oral hygiene measures .


4. 2-modified ridge lap pontic:

-its amodification of ridge lap to solve the problem of food accumulation and
at the same time gives esthetic appearance

-its convex .concave design

-indications:area of esthetic concern:upper &lower anteriors.,max.premolars
and molars.

Materials:metal ceramics and all ceramics

5. 3-conical pontic(egg&heart shape)
-its convex with only one point contact with the ridge
-indications:mandibular posterior teeth
-material:all metal-ceramo metallic-all ceramic

6. 4-ovate pontic

-the most esthetically appearing pontic

-disadvantages:requires surgical preparation

-indications:maxillary anteriors and premolars

Material:metal ceramic &all ceramic

7. Non mucosal contact pontic design
1-sanitary (hygienic)

-indications:non appearance zone,(mandibular molars)

Material:metallic only

-advantage:good access for oral hygiene

-disadvantage:bad esthetics and food entrapement

Contraindication:-anterior zone—minimum occlusogingival height.

8. 2-modified sanitary pontic design


-its amodified version of sanitary pontic where it the gingival portion is
shaped like an arch way between the retainers.

-

9. Finish line

Definition:it’s the line of demarcation between prepared and unprepared
tooth structure.

Criteria of ideal finish line:

-smooth&continuous

-well defined&distinct

-easily identified on the impression & die

-conservative

-distinct boundary for wax pattern construction

-sufficient bulk for the material

10. Types of finish line
1-feather edge finish line

-it fails to provide adequate bulk for the restoration

-overcontoured restoration often results.

11. 2-chisel edge finish line:

-its variant of knife edge f.l and it differs from it by a larger angle between
the axial surface and unprepared tooth structure.

12. 3-chamfer finish line

-recommendd for cast metal restorations

Advantages:distinct,easily identified,provide room for the bulk of the
restorative material and can be prepared with precision.

-tool:tapered diamond stone with round end

13. 4-shoulder finish line

-its recommended for all ceramic restorations and facial part of ceramo
metallic restoration

-tool:tapered diamond stone with flat end

Angle:90 with the prepared axial surface of tooth structure.

-disadvantage:less conservativer

14. 5-shoulder with bevel

-its recommended for the facial aspect of ceramometallic restorations where
the metal collar is used.

-when there is caries cervical to previous old shoulder

-the bevel removes unsupported enamel on the old shoulder

15. 6-sloped shoulder finish line

-its recommended as alternative of 90 degree shoulder

Advantages:

1-removes unsupported enamel

2-gives room for metal thickening for thinning for good adaptation