CA1068138A - Dental reinforcing pin - Google Patents
Dental reinforcing pinInfo
- Publication number
- CA1068138A CA1068138A CA240,901A CA240901A CA1068138A CA 1068138 A CA1068138 A CA 1068138A CA 240901 A CA240901 A CA 240901A CA 1068138 A CA1068138 A CA 1068138A
- Authority
- CA
- Canada
- Prior art keywords
- pin
- threaded portion
- dental
- piece
- hand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/30—Securing inlays, onlays or crowns
- A61C5/35—Pins; Mounting tools or dispensers therefor
Abstract
ABSTRACT OF THE DISCLOSURE A dental reinforcing pin comprising a threaded portion for self-tapping insertion in a bore formed in a tooth under-structure and a connecting portion formed integrally with the threaded portion, the connecting portion including a shank cap-able of slidable insertion in a dental hand-piece, and including a weakened portion intermediate the threaded portion and the connecting portion to permit shearing and separation of the con-necting portion from the threaded portion.
Description
106813~
The invention relates to a dental reinforcing pin for -use in the anchoring of a superstructure to a tooth understruc-ture.
In the restoration of a badly decayed tooth a super-structure of amalgam or composite is built on to the sound den--. tine understructure of the tooth. Various dental reinforcing pins have been used for anchoring the superstructure to the under-structure.
It is known to employ a dental reinforcing pin compris-ing at one end a threaded portion for self-tapping insertion in a drilled hole in a tooth, the pin at the other end having a con-necting portion provided with means for engagement with a manually operated screw-driver. A reduced diameter neck is provided be-tween the connecting portion and the threaded portion so that the connecting portion will automatically shear off from the threaded portion when the latter reaches the bottom of the hole. Such a pin suffers from the disadvantage that due to the flange and slot connection between the pin and the screw-driver there is the danger that the pin will dislodge from the screw-driver dur-ing the insertion and fall into the patient's mouth with perhaps , serious consequences if swallowed. Such danger also occurs in the modification of this pin in which the threaded portion is in two sections joined by a further neck. Furthermore, in both cases the insertion procedure is cumbersome.
It is also known to connect the above type of pin with ;a separate chuck which is then itself loaded in a dental hand-piece for mechanical insertion of the thread portion. The flange and slot connection between the chuck and the pin gives rise to the same danger of the pin falling into the patient's mouth dur-ing insertion and the insertion procedure is time-consuming.
~- It is a feature of the present invention to provide an improved dental reinforcing pin which substantially overcomes the ~.
. , , , - -: .
,' ' ' . :
... . .
~ 1068138 above mentioned disadvantages. -~
Accordingly, from a broad aspect, the present inven-tion provides a dental reinforcing pin comprising a threaded portion for self-tappin~ insertion in a bore formed in a tooth under-structure, a connecting portion comprising a shank section, ,.4 :. .
and a weakened portion intermediate the threaded portion and one end of the shank section for permitting shearing and separa-tion of the shank section from the threaded portion, said shank section having a free end shaped to cooperate with locking means on a dental hand-piece so that said pin can be locked to said hand-piece.
The invention will now be described with reference to the accompanying drawings which show a preferred form thereof and wherein:
Figure 1 is a side elevation of a dental reinforcing pin machined from stainless steel wire, Figure 2 is an end elevation of the dental reinforcing pin; and Figure 3 is a side elevation of another embodiment of the dental pin.
Referring now to Figures 1 and 2, the dental reinforc-ing pin has a screw-threaded portion 10 at one end thereof. The . . .
threaded portion 10 may have an outside diameter of 0.76 mm and a length of 4 mm. Formed integrally with the threaded portion 10 is a connecting portion 11 comprising an elongated circular-cylin-drical shank 12. The diameter of the shank 12 is larger than that of the threaded portion 10 and is such that the shank will be an easy sliding fit in a standard dental hand-piece. The shank 12 is shaped at its free end, providing a segmental cut-away portion 13 and part-annular groove 14 so that the shank 12 can co-operate with the latch mechanism of a latching-type dental hand-piece and be locked thereby. The end of the connecting portion 11 adjacent the threaded portion 10 is constituted by a frusto-conical por-tion 15. Intermediate the threaded portion 10 and the connecting
The invention relates to a dental reinforcing pin for -use in the anchoring of a superstructure to a tooth understruc-ture.
In the restoration of a badly decayed tooth a super-structure of amalgam or composite is built on to the sound den--. tine understructure of the tooth. Various dental reinforcing pins have been used for anchoring the superstructure to the under-structure.
It is known to employ a dental reinforcing pin compris-ing at one end a threaded portion for self-tapping insertion in a drilled hole in a tooth, the pin at the other end having a con-necting portion provided with means for engagement with a manually operated screw-driver. A reduced diameter neck is provided be-tween the connecting portion and the threaded portion so that the connecting portion will automatically shear off from the threaded portion when the latter reaches the bottom of the hole. Such a pin suffers from the disadvantage that due to the flange and slot connection between the pin and the screw-driver there is the danger that the pin will dislodge from the screw-driver dur-ing the insertion and fall into the patient's mouth with perhaps , serious consequences if swallowed. Such danger also occurs in the modification of this pin in which the threaded portion is in two sections joined by a further neck. Furthermore, in both cases the insertion procedure is cumbersome.
It is also known to connect the above type of pin with ;a separate chuck which is then itself loaded in a dental hand-piece for mechanical insertion of the thread portion. The flange and slot connection between the chuck and the pin gives rise to the same danger of the pin falling into the patient's mouth dur-ing insertion and the insertion procedure is time-consuming.
~- It is a feature of the present invention to provide an improved dental reinforcing pin which substantially overcomes the ~.
. , , , - -: .
,' ' ' . :
... . .
~ 1068138 above mentioned disadvantages. -~
Accordingly, from a broad aspect, the present inven-tion provides a dental reinforcing pin comprising a threaded portion for self-tappin~ insertion in a bore formed in a tooth under-structure, a connecting portion comprising a shank section, ,.4 :. .
and a weakened portion intermediate the threaded portion and one end of the shank section for permitting shearing and separa-tion of the shank section from the threaded portion, said shank section having a free end shaped to cooperate with locking means on a dental hand-piece so that said pin can be locked to said hand-piece.
The invention will now be described with reference to the accompanying drawings which show a preferred form thereof and wherein:
Figure 1 is a side elevation of a dental reinforcing pin machined from stainless steel wire, Figure 2 is an end elevation of the dental reinforcing pin; and Figure 3 is a side elevation of another embodiment of the dental pin.
Referring now to Figures 1 and 2, the dental reinforc-ing pin has a screw-threaded portion 10 at one end thereof. The . . .
threaded portion 10 may have an outside diameter of 0.76 mm and a length of 4 mm. Formed integrally with the threaded portion 10 is a connecting portion 11 comprising an elongated circular-cylin-drical shank 12. The diameter of the shank 12 is larger than that of the threaded portion 10 and is such that the shank will be an easy sliding fit in a standard dental hand-piece. The shank 12 is shaped at its free end, providing a segmental cut-away portion 13 and part-annular groove 14 so that the shank 12 can co-operate with the latch mechanism of a latching-type dental hand-piece and be locked thereby. The end of the connecting portion 11 adjacent the threaded portion 10 is constituted by a frusto-conical por-tion 15. Intermediate the threaded portion 10 and the connecting
- 2 -~, . _ " , . . . . . . .
~06l~138 portion 11 is a reduced diameter portion or neck 16 having a ~, diameter less than the root diameter of the threaded portion 10 so as to provide a fracture or shear portion.
In operation, the carious matter is removed from the surface of a broken-down tooth leaving a sound dentine understruc-ture. A hole is drilled in the dentine in well-known manner with a dental drill. The reinforcing pin is loaded in a latching- ~
type contra-angle dental hand-piece by sliding the shank 12 into ~ !`
the hand-piece and locking it with the latch on the hand-piece.
The threaded portion 10 and the frusto-conical portion 15 now project clear of the barrel of the hand-piece. The hand-piece drive, comprising an air motor or other known means, is now operated, causing rotation of the dental pin. The reinforcing pin is now aligned and engaged with the drilled hole, the frusto-conical portion 15 aiding visibility. The reinforcing pin will now advance in self-tapping manner in the drilled hole which has a diameter slightly less than the thread diameter so that a good anchorage is obtained by the inter-engagement of the thread on the pin and the thread formed in the dentine. When the pin has penetrated to the bottom or nearly the bottom of the hole so that resistance is met to further movement, the neck 16 automatically shears so that the connecting portion 12 is separated from the threaded portion 10. The depth of the drilled hole can be chosen so that when the shear-off point is reached, for example half the length of the threaded portion 10 extends into the dentine and the remainder projects from the tooth understructure. The connecting portion 11 can now be released from the hand-piece and discarded.
Finally, the tooth is built up with an amalgam or composite supér-structure around the threaded portion in known manner. :
It will be apparent that the reinforcing pin described above is very safe in use in that the pin is securely locked to ` the hand-piece during the insertion and thus the danger of the pin ' '.
. , , .: ., ~ . . '. : : : ' :
.. . . .
~0~Li8138 falling into the patient's mouth is minimized. Furthermore, the described pin enables the operation of inserting a threaded por-tion in a tooth to be per~ormed quickly and easily.
Referring to Figure 3, a threaded portion comprises two equal sections 20 and 21 joined by a neck 22. A neck 23 is pro-vided intermediate the threaded section 20 and the connecting portion 11. The neck 22 has a slightly smaller diameter than that of the neck 23. The reinforcing pin is operated in the same manner as the first described embodiment except that shear will first occur at the relatively smaller diameter neck 22 so that the connecting portion 11 together with the threaded section 20 separate from the threaded section 21. The hand-piece holding securely the threaded section 20 can now be aligned with a second drilled hole in a tooth. Operation of the hand-piece now causes self~threading insertion of the pin in the second hole and when the pin reaches the bottom of the hole, shear occurs at the neck 23 so that the connecting portion 11 separates from the threaded section 20. By this means, threaded portions can be inserted in two drilled holes without the need to re-load the hand-piece.
In another embodiment of the invention, part of the connecting portion remote from the threaded portion is formed from a material different from that of the threaded portion and is moulded to the remainder of the pin to form an integral struc-ture.
The free end of the connecting portion may be shaped in a different way from that described above to co-operate with lock-ing means on the hand-piece so that the dental pin is locked to the hand-piece.
-..
., .
-
~06l~138 portion 11 is a reduced diameter portion or neck 16 having a ~, diameter less than the root diameter of the threaded portion 10 so as to provide a fracture or shear portion.
In operation, the carious matter is removed from the surface of a broken-down tooth leaving a sound dentine understruc-ture. A hole is drilled in the dentine in well-known manner with a dental drill. The reinforcing pin is loaded in a latching- ~
type contra-angle dental hand-piece by sliding the shank 12 into ~ !`
the hand-piece and locking it with the latch on the hand-piece.
The threaded portion 10 and the frusto-conical portion 15 now project clear of the barrel of the hand-piece. The hand-piece drive, comprising an air motor or other known means, is now operated, causing rotation of the dental pin. The reinforcing pin is now aligned and engaged with the drilled hole, the frusto-conical portion 15 aiding visibility. The reinforcing pin will now advance in self-tapping manner in the drilled hole which has a diameter slightly less than the thread diameter so that a good anchorage is obtained by the inter-engagement of the thread on the pin and the thread formed in the dentine. When the pin has penetrated to the bottom or nearly the bottom of the hole so that resistance is met to further movement, the neck 16 automatically shears so that the connecting portion 12 is separated from the threaded portion 10. The depth of the drilled hole can be chosen so that when the shear-off point is reached, for example half the length of the threaded portion 10 extends into the dentine and the remainder projects from the tooth understructure. The connecting portion 11 can now be released from the hand-piece and discarded.
Finally, the tooth is built up with an amalgam or composite supér-structure around the threaded portion in known manner. :
It will be apparent that the reinforcing pin described above is very safe in use in that the pin is securely locked to ` the hand-piece during the insertion and thus the danger of the pin ' '.
. , , .: ., ~ . . '. : : : ' :
.. . . .
~0~Li8138 falling into the patient's mouth is minimized. Furthermore, the described pin enables the operation of inserting a threaded por-tion in a tooth to be per~ormed quickly and easily.
Referring to Figure 3, a threaded portion comprises two equal sections 20 and 21 joined by a neck 22. A neck 23 is pro-vided intermediate the threaded section 20 and the connecting portion 11. The neck 22 has a slightly smaller diameter than that of the neck 23. The reinforcing pin is operated in the same manner as the first described embodiment except that shear will first occur at the relatively smaller diameter neck 22 so that the connecting portion 11 together with the threaded section 20 separate from the threaded section 21. The hand-piece holding securely the threaded section 20 can now be aligned with a second drilled hole in a tooth. Operation of the hand-piece now causes self~threading insertion of the pin in the second hole and when the pin reaches the bottom of the hole, shear occurs at the neck 23 so that the connecting portion 11 separates from the threaded section 20. By this means, threaded portions can be inserted in two drilled holes without the need to re-load the hand-piece.
In another embodiment of the invention, part of the connecting portion remote from the threaded portion is formed from a material different from that of the threaded portion and is moulded to the remainder of the pin to form an integral struc-ture.
The free end of the connecting portion may be shaped in a different way from that described above to co-operate with lock-ing means on the hand-piece so that the dental pin is locked to the hand-piece.
-..
., .
-
Claims (2)
1. A dental reinforcing pin comprising a threaded portion for self-tapping insertion in a bore formed in a tooth under-structure, a connecting portion comprising a shank section, and a weakened portion intermediate the threaded portion and one end of the shank section for permitting shearing and separation of the shank section from the threaded portion, said shank section having a free end shaped to cooperate with locking means on a dental hand-piece so that said pin can be locked to said hand-piece.
2. A dental reinforcing pin according to claim 1, in which said free-end of said shank section has a flat portion and a part-annular groove whereby the shank section can be latched in a latching type hand-piece.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB52277/74A GB1482681A (en) | 1974-12-03 | 1974-12-03 | Dental anchoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1068138A true CA1068138A (en) | 1979-12-18 |
Family
ID=10463311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA240,901A Expired CA1068138A (en) | 1974-12-03 | 1975-12-02 | Dental reinforcing pin |
Country Status (14)
| Country | Link |
|---|---|
| JP (2) | JPS5182995A (en) |
| AU (1) | AU500714B2 (en) |
| BE (1) | BE836202A (en) |
| BR (1) | BR7507999A (en) |
| CA (1) | CA1068138A (en) |
| CH (1) | CH588856A5 (en) |
| DE (1) | DE2554179C3 (en) |
| DK (1) | DK140273B (en) |
| FR (1) | FR2293184A1 (en) |
| GB (1) | GB1482681A (en) |
| IT (1) | IT1059848B (en) |
| NL (1) | NL7513780A (en) |
| NO (1) | NO754050L (en) |
| SE (1) | SE413366B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1597483A (en) * | 1977-03-11 | 1981-09-09 | Carse M D | Dentine pin |
| FR2478993B1 (en) * | 1980-04-01 | 1985-07-05 | Weissman Bernard | DENTAL TOOL WITH SECONDABLE ROD |
| AU8051382A (en) * | 1981-02-17 | 1982-08-26 | Alan Julian Segal | Dental pin for anchoring cast restorations |
| GB8301483D0 (en) * | 1983-01-20 | 1983-02-23 | Hinks H N | Dental anchoring device |
| DE8401938U1 (en) * | 1984-01-24 | 1984-05-03 | Edenta AG, 9434 Au | SCREW PIN FOR BUILDING DAMAGED TEETH |
| AU6047890A (en) | 1989-08-03 | 1991-03-11 | Alan Julian Segal | Dental anchoring device |
| DE9307542U1 (en) * | 1993-05-18 | 1993-07-29 | Schumacher, Dieter, 24768 Rendsburg, De |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS509119B2 (en) * | 1972-06-08 | 1975-04-10 |
-
1974
- 1974-12-03 GB GB52277/74A patent/GB1482681A/en not_active Expired
-
1975
- 1975-11-25 SE SE7513238A patent/SE413366B/en not_active IP Right Cessation
- 1975-11-26 NL NL7513780A patent/NL7513780A/en active Search and Examination
- 1975-11-27 DK DK534475AA patent/DK140273B/en not_active IP Right Cessation
- 1975-11-27 AU AU87004/75A patent/AU500714B2/en not_active Expired
- 1975-12-02 IT IT69960/75A patent/IT1059848B/en active
- 1975-12-02 JP JP50143791A patent/JPS5182995A/ja active Pending
- 1975-12-02 NO NO754050A patent/NO754050L/no unknown
- 1975-12-02 DE DE2554179A patent/DE2554179C3/en not_active Expired
- 1975-12-02 BR BR7507999*A patent/BR7507999A/en unknown
- 1975-12-02 CA CA240,901A patent/CA1068138A/en not_active Expired
- 1975-12-02 CH CH1568675A patent/CH588856A5/xx not_active IP Right Cessation
- 1975-12-03 BE BE2054687A patent/BE836202A/en not_active IP Right Cessation
- 1975-12-03 FR FR7536931A patent/FR2293184A1/en active Granted
-
1977
- 1977-10-06 JP JP1977134761U patent/JPS5349293U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CH588856A5 (en) | 1977-06-15 |
| BR7507999A (en) | 1976-08-24 |
| IT1059848B (en) | 1982-06-21 |
| DK140273C (en) | 1979-12-17 |
| DE2554179C3 (en) | 1978-05-24 |
| SE7513238L (en) | 1976-06-04 |
| JPS5349293U (en) | 1978-04-26 |
| DE2554179B2 (en) | 1977-09-29 |
| BE836202A (en) | 1976-04-01 |
| FR2293184A1 (en) | 1976-07-02 |
| NL7513780A (en) | 1976-06-08 |
| AU8700475A (en) | 1977-06-09 |
| AU500714B2 (en) | 1979-05-31 |
| DK534475A (en) | 1976-06-04 |
| SE413366B (en) | 1980-05-27 |
| GB1482681A (en) | 1977-08-10 |
| DE2554179A1 (en) | 1976-06-10 |
| JPS5182995A (en) | 1976-07-21 |
| DK140273B (en) | 1979-07-23 |
| NO754050L (en) | 1976-06-04 |
| FR2293184B1 (en) | 1982-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |
Effective date: 19961218 |