CN205031373U - Bipyramid degree becomes root canal stake in advance - Google Patents
Bipyramid degree becomes root canal stake in advance Download PDFInfo
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- CN205031373U CN205031373U CN201520739657.XU CN201520739657U CN205031373U CN 205031373 U CN205031373 U CN 205031373U CN 201520739657 U CN201520739657 U CN 201520739657U CN 205031373 U CN205031373 U CN 205031373U
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Abstract
The utility model relates to a bipyramid degree becomes root canal stake in advance, including pile head and pile body, the pile body bottom has the toper terminal, and the pile head bottom is the maintenance dish, and the maintenance dish links to each other with the pile body, and the maintenance dish sets up with the pile body is concentric, and maintenance dish diameter is greater than the pile body diameter, the pile body divide into upper segment pile body and hypomere pile body, and upper segment pile body and hypomere pile body are inverted circular truncated cone, and the bottom surface of upper segment pile body is the top surface of hypomere pile body, and the tapering of upper segment pile body is greater than the tapering of hypomere pile body, and the hypomere pile body conical surface sets up the screw thread. The utility model provides a two tapered pile bodies accord with chinese's root of the tooth form characteristics more, are favorable to the stake to be said and prepare, keep more polydonita essence structure, lower risk of rolling over of stress state.
Description
Technical field
This utility model and field of medical appliances, particularly relate to a kind of double tapered Prefabricated post.
Background technology
Root canal is effective Therapeutic Method the most frequently used in the world of dental pulp disease and periapical disease.The principle of root canal therapy is the most of infectious agent removed by machinery and chemical method in root pipe, and by root canal filling, close bizet, prevent the healing of the periapical lesion that periapical lesion or promotion have occurred.The integrity that root canal can keep natural teeth to arrange, prevent the generation of the displacement of abutment teeth, dental caries, periodontal disease, the support deossification after having tooth pulled out can be prevented too much, along with the aging of society and the reinforcement of patient care's consciousness, need the case of carrying out residual root reservation increasing clinically.The reservation of residual root maintains normal Arch width well, not only simplify the difficulty of repairing and treating, and has recovered occluding relation and masticatory function, is a kind of important way of repairing and treating.
List of references of the present utility model:
【1】LimSS,StockCJ.Theriskofperforationinthecurvedcanal:anticurvaturefilingcomparedwiththestepbacktechnique[J].IntEndodJ,1987，20(1):33-39.
Utility model content
Nowadays clinical practice widely root canal pile system mostly with the root of the tooth of west ethnic group and root tubular construction be characterized as basis research and development, owing to lacking enough clinical anatomy foundations, the length of stake, diameter and form can not be adapted to Chinese's root of the tooth and root canal morphology well.If be applied to Chinese patients, often increase operation time root of tooth wear, root folding equivalent risk, thus affect core crown final effect and trouble tooth good reservation.
For solving the problems of the technologies described above, this utility model aims to provide a kind of double tapered Prefabricated post, adapts to Chinese's root of the tooth and root canal anatomic form, and under reducing functional status, root the wind from the northwest being apt to impair the small intestine is dangerous.
For achieving the above object, the technical scheme that this utility model is taked is as follows:
A kind of double tapered Prefabricated post, comprise pile crown and pile body, have tapered distal end bottom pile body, be maintenance dish bottom described pile crown, maintenance dish is connected with pile body, and described maintenance dish is arranged with pile body is concentric, and maintenance dish diameter is greater than pile body diameter; Described pile body is divided into epimere pile body and hypomere pile body, described epimere pile body and hypomere pile body are reverse frustoconic, the bottom surface of epimere pile body is the end face of hypomere pile body, and the tapering of described epimere pile body is greater than the tapering of hypomere pile body, and the described hypomere pile body conical surface arranges screw thread.
Preferably, described screw thread is angular thread.
Preferably, described pile crown top is retainer A, and described retainer A end face has cross recess.
Preferably, described pile crown comprises retainer B, and described retainer B is located between retainer A and maintenance dish, and the diameter of retainer B is less than the diameter of maintenance dish.
Further, the cross section of described retainer A is square, and the described foursquare length of side is less than the diameter of maintenance dish.
Further, the end face of described retainer A and retainer B is the inclined-plane downward-sloping gradually to edge from centre, and the bottom surface of retainer A and retainer B to be from centre to edge acclivitous inclined-plane gradually.The maintenance inclined-plane that retainer A and retainer B is arranged can produce good retention form, increases contact area, increases retention.
Further, described epimere pile body basal diameter is 0.49mm ~ 1.23mm; The tapering of described epimere pile body is 0.02 ~ 0.46; The tapering of described hypomere pile body is 0.02 ~ 0.19.
Further, described epimere pile body basal diameter is 0.9mm ~ 1.1mm; The tapering of described epimere pile body is 0.05 ~ 0.2; The tapering of described hypomere pile body is 0.02.
Further, the material of described double tapered Prefabricated post is Ti2448 alloy.
Compared with prior art, this utility model has following beneficial effect:
1. the pile body of double tapered meets Chinese's root form feature more, is conducive to a road preparation, retains more polydonita essential structure;
2. root canal pile adopts Ti2448 alloy to make, low elastic modulus, high strength, good biocompatibility, and material property is remarkable, the risk of root folding under attenuating stress state;
3. there is special retention system: pile body top adopts cross retention grooves, and hypomere pile body portion triangle thread, facilitates implantation and the taking-up of root canal pile;
4. cheap, require low to doctor's operating technology, wide application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the top view of Fig. 1;
Fig. 3: apical area maximum principal stress peak value stress curve figure during Oblique loading;
Fig. 4: root of the tooth cervical region maximum principal stress peak curve figure during Oblique loading;
Fig. 5: root of the tooth cervical region maximum principal stress peak curve figure when Vertical dimension loads;
Fig. 6: apical area maximum principal stress peak curve figure when Vertical dimension loads
In figure: 1-cross recess, 2-retainer B, 3-maintenance dish, 4-epimere pile body, 5-hypomere pile body, 6-tapered distal end, 7-screw thread.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly understand, the embodiment provided below in conjunction with accompanying drawing and utility model people is described in further detail this utility model.
Double tapered Prefabricated post disclosed in this utility model, comprises pile crown and pile body as shown in Figure 1, 2, has tapered distal end 6 bottom pile body, and pile crown top is retainer A, and retainer A end face has cross recess 1; It is maintenance dish 3 bottom pile crown, retainer B2 is provided with between retainer A and maintenance dish 3, the diameter of retainer B2 is less than the diameter of maintenance dish 3, the cross section of retainer A is square, the foursquare length of side is less than the diameter of maintenance dish 3, the end face of retainer A and retainer B2 and bottom surface are maintenance inclined-plane, and maintenance inclined-plane is the inclined-plane downward-sloping gradually to edge from centre.Maintenance dish 3 is connected with pile body, maintenance dish 3 is arranged with pile body is concentric, and maintenance dish 3 diameter is greater than pile body diameter, and pile body is divided into epimere pile body 4 and hypomere pile body 5, epimere pile body 4 and hypomere pile body 5 are reverse frustoconic, and the bottom surface of epimere pile body 4 is the end face of hypomere pile body 5.Hypomere pile body 5 conical surface arranges screw thread 7, and screw thread 7 is angular thread preferably.
In embodiment 1, the tapering of epimere pile body 4 is greater than the tapering of hypomere pile body 5.In example 2, epimere pile body 4 basal diameter is 0.49mm ~ 1.23mm, and the tapering of epimere pile body 4 is 0.02 ~ 0.46, and the tapering of hypomere pile body 5 is 0.02 ~ 0.19, and preferably, epimere pile body 4 basal diameter is 0.9mm ~ 1.1mm; The tapering of epimere pile body 4 is 0.05 ~ 0.2, and the tapering of hypomere pile body 5 is 0.02.The Material selec-tion Ti2448 alloy of double tapered Prefabricated post in embodiment 3.
Embodiment 1: the selection of double tapered design
The present embodiment establishes the data base of In Chengdu Chinese 960 backteeth roots of the tooth and root canal anatomic form, and premolars and grind one's teeth in sleep each corona and root of the tooth size, the length of stake road section, stake road root-end diameter, root of the tooth tapering are measured and added up, provide reference frame as the stake road preparation of backteeth and the design of pre-pile.In conjunction with the analysis result of data base, pile body portion epimere tapering is adopted to be greater than the double tapered design of hypomere tapering.Because this design is better with root form accordance to a certain extent, ensure that the safety that root canal pile is implanted and root canal pile retention and intensity, and remain and more remain dentin.The rational root canal pile model of reference database design data, to ensure to select rational root canal pile tapering, diameter when not destroying apical area and closing.
The requirement of root canal pile design: first require that the length of stake at least should be greater than crown length, the length of stake should reach 2/3 ~ 3/4 of root length, the length of the stake in alveolar bone should be greater than 1/2 of root length in alveolar bone, should retain the tip of a root enclosed area of 3 ~ 5mm between the latter end of stake and apical foramen of tooth.Next requires that the root canal wall around stake has the thickness of 1mm at least, and the diameter of desirable stake is 1/3 of root footpath.Therefore, set up the data base of In Chengdu compatriots 960 backteeth roots of the tooth and root canal morphology, to the length (see table 1 and table 2) of premolars and grind one's teeth in sleep each corona and root of the tooth size, stake road section; Stake road root-end diameter, root of the tooth tapering (see table 3 and table 4) etc. carry out measuring and adding up.
Table 1: In Chengdu compatriots 480 premolars root of the tooth stake roads segment length measurement result (mm)
Table 2: In Chengdu compatriots 480 grind one's teeth in sleep root of the tooth stake road segment length measurement result (mm)
Table 3: premolars taper measurement result
Table 4: taper measurement result of grinding one's teeth in sleep
From table 1 ~ 4: backteeth stake road section three part tapering from root cap to the tip of a root all in reduction trend, in premolars root cap 1/3, root 1/3 and the tapering meansigma methods of the tip of a root 1/3 be respectively 0.3,0.22 and 0.18.To grind one's teeth in sleep in root cap 1/3, root 1/3 and the tapering meansigma methods of the tip of a root 1/3 be followed successively by 0.46,0.27 and 0.19, in root, 1/3 is close with the tip of a root 1/3 tapering size, result show the Prefabricated post of double tapered and root form accordance better.
Embodiment 2: tapering preferred
Need before core crown clinically to carry out perfect root canal, a step important in root canal and root canal preparation to trouble tooth, still lack accurate method at present to measure the root pipe tapering before root canal preparation, and apical foramen of tooth is larger to the diameter variation of root canal orifice.Modern root canal preparation advocates root pipe to be formed the tapering form adapted with specific root pipe charges and placement method, and this can destroy some residual dentin to a certain extent and change root pipe tapering form originally.Therefore, the design in stake road is not only good with root form accordance, also will meet root canal morphology after root canal preparation as far as possible, to reduce root canal preparation Hou Zhuan road preparation to the Dentinal destruction of residue, retains more multiresidue dentin as far as possible.
In sum, epimere pile body tapering is adopted to be greater than the double tapered root canal pile design of hypomere pile body tapering, range of taper reasonable in design in the present embodiment.First, 5 be the results are shown in Table to premolars and a road section root-end diameter measurement of grinding one's teeth in sleep, table 6.Statistics t assay shows, with the equal not statistically significant of difference (P>0.05) of sex bilateral premolars or grind one's teeth in sleep a road segment length and stake road root-end diameter.And measure the average value ranges of root-end diameter, be at 2.49mm-3.23mm substantially.From list of references [1] 33-39, the pressure of root-canal filling is maintained and the Bao Genguan dentin wall thickness of functionating is 0.3mm after root canal preparation, and two side has 1mm root of the tooth thickness at least around stake road, therefore hypomere pile body basal diameter is designed in the scope of 0.49-1.23mm.
Table 5 In Chengdu compatriots 480 premolars stake roads section root-end diameter measurement result (mm)
Table 6 In Chengdu compatriots 480 grind one's teeth in sleep road section root-end diameter measurement result (mm)
Secondly, from embodiment 1, the data of table 1 ~ table 4 show, the average value ranges of premolars and tapering difference of grinding one's teeth in sleep is 0.18-0.46, and the range of taper of conventional root canal preparation apparatus is 0.02-0.19.Consider the factor of root of the tooth tapering matching and root pipe matching, the range of taper of design epimere pile body is 0.02 ~ 0.46; Premolars and the root of the tooth of grinding one's teeth in sleep there will be nearly central diameter constriction far away to the extension of root side, and the tip of a root bends, tip of a root bifurcated, and root pipe also there will be tip of a root bifurcated, tip of a root difference etc. variation.And weaker to the root canal wall of tip of a root section itself in root, therefore should reduce the cutting to middle-distant direction root canal wall as far as possible, retain original root canal morphology.Root canal preparation tapering form Design conventional clinically has Protaper hands to use or machine nickel-titanium instruments series, main cone degree is 0.02-0.19, the novel rotary NiTi-instruments of KerrK3, tapering is 0.04,0.06,0.08,0.1, the root canal orifice of ProFile apparatus is shaped the tapering of file to be the tapering of 0.05-0.08, ProFileGT apparatus is 0.06,0.08,0.1,0.12 etc.Although the tapering of these apparatuses is conducive to the cleaning of the root pipe after root canal preparation and root-canal filling, can impact the maintenance of root canal pile.More with tapering Yue great cutting tooth tissue in diameter situation, weaken the force resistance of root of the tooth, add root folding probability.When epimere pile body basal diameter is constant, tapering is larger, and hypomere pile body basal diameter is less, affects the intensity of root canal pile, apical area tooth body stressed and with the adaptation of root canal wall.Therefore, hypomere pile body tapering should reduce as far as possible and meet root canal preparation range of taper, and the range of taper of design hypomere pile body is 0.02 ~ 0.19.Increase for reducing hypomere pile body tapering the above harmful effect brought in the present embodiment, and meet the principle of root canal preparation tapering as far as possible, design hypomere pile body tapering is conventional root canal preparation tapering 0.02.According to basal diameter and upper-lower section pile body range of taper, the present embodiment is provided with double tapered Prefabricated post specification (see table 7).
Table 7: novel beta-titanium alloy double tapered Prefabricated post gauge table
The present embodiment preferentially establishes 12 double tapered Prefabricated post three-dimensional finite element model under guarantee apical area 4mm ~ 5mm tip of a root is closed and the preparation of stake road at least retains the Dentinal principle of 1mm.The index that finite element analysis is commonly used has maximum principal stress, minimum principal stress, equivalent stress etc.Minimum stress peak value due to residual tooth tissue all only has the 1/15-1/10 of its comprcssive strength, and maximum principal stress peak value differs with tensile strength less than 1/2, maximum principal stress can be used for the actual loading situation of description scheme, its size determines structure and whether occurs crack and be subject to failure by shear, so embodiment utilizes three-dimensional finite element analysis to inquire into the root canal pile of different tapering and bottom diameter in oblique and Vertical loading condition lower tooth collar portion, apical area dentin maximum principal stress peak condition (see table 8, Fig. 3 ~ Fig. 6).
Table 8: epimere pile body different tapering, the root canal pile root of the tooth cervical region of bottom diameter, apical area, root canal pile maximum principal stress peak value contrast table
Show according to above experimental result:
1., during Oblique loading, bottom diameter is constant, apical area and root of the tooth cervical region maximum principal stress peak value with the reduction of bottom diameter afterwards in the trend risen.Contrast each group of bottom diameter, all when tapering is 0.1mm, maximum principal stress peak value reduces to minimum, in rising trend gradually afterwards.Contrast each group of tapering, occur that when diameter is 1.0mm the frequency of maximum principal stress peak minimum level is the highest.This meets within the scope of the suitable bottom diameter of this patent design.
2., when Vertical dimension loads, apical area maximum stress peak value difference is little.And in tooth neck regions, contrast each group of tapering, occur that when diameter is 1.0mm the frequency of maximum principal stress peak minimum level is the highest.
3. contrast each group of stressing conditions known, 2-3 group root of the tooth cervical region, apical area dentin stressing conditions are best, can organize data complete the diameter of Prefabricated post and the design of tapering with reference to this.
Embodiment 3
Table 5 is double tapered Prefabricated post specification, be designed to example with preferred No. 3 stake (see table 5) profiles below and carry out three-dimensional finite element stress analysis, compare different materials (Ti-6Al-4V, novel β titanium, pure titanium) and different tapering root canal pile (double tapered stake, flat shape stake, tapered pile) in vertical and Oblique loading condition lower tooth collar portion, the stressing conditions (see table 8) of apical area dentin and root canal pile.
Table 9:Ti-6Al-4V, novel β titanium, pure titanium material properties
Table 10: different tapering form, different materials maximum principal stress peak value contrast table
Show according to above experimental result:
1. different root canal pile form contrast, when double tapered stake obviously can reduce Oblique loading, root of the tooth cervical region is stressed, and apical area also reduces relatively.Vertical dimension impact is little.
2. form different materials contrast of the same race, during Oblique loading, along with the elastic modelling quantity of material reduces, root of the tooth cervical region stress increases, and the corresponding reduction of apical area.Illustrate that the novel β titanium of low elastic modulus has and reduce apex of root of tooth stress trend, can lower apical area stress level, significant to prevention root folding.
Based on the above, in the present embodiment, double tapered root canal pile adopts the novel beta-titanium alloy of Chinese Academy of Sciences's research and development (also known as Ti2448, its essential element is that titanium niobium zirconium stannum (TiNbZrSn alloy) is made, its good biocompatibility, there is lower elastic modelling quantity (forging 33Gpa, casting 42Gpa), closer to elastic modelling quantity (about 18.6GPa) Dentinal in tooth structure compared with a lot of similar metal or ceramic material, and its tensile strength and hardness are all close to conventional cast metal, have good application prospect in field, oral cavity.
By embodiment 1,2,3 known, adopt suitable double tapered scope (hypomere pile body basal diameter scope 0.49-1.23mm; The range of taper 0.02 ~ 0.46 of epimere pile body; The range of taper 0.02 ~ 0.19 of hypomere pile body) root pipe accordance is better after the Prefabricated post that designs and root form and root canal preparation. in addition, Fig. 3 ~ Fig. 6 data and curves shows when epimere pile body basal diameter is identical, the tapering of epimere pile body is 0.05 ~ 0.2, when the tapering of hypomere pile body is 0.02, root of the tooth cervical region, apical area dentin maximum principal stress are all relatively stable and desirable; When pile body tapering is identical, when epimere pile body 4 basal diameter is 0.9mm ~ 1.1mm, root of the tooth cervical region, apical area dentin maximum principal stress are all relatively stable and desirable;
Meanwhile, novel beta-titanium alloy double tapered Prefabricated post has less peak stress in apical area, must affirm the Effect value reducing apical area stress level.
Certainly; this utility model also can have other various embodiments; when not deviating from this utility model spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to this utility model, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by this utility model.
Claims (9)
1. a double tapered Prefabricated post, comprise pile crown and pile body, tapered distal end (6) is had bottom pile body, it is characterized in that: be maintenance dish (3) bottom described pile crown, maintenance dish (3) is connected with pile body, described maintenance dish (3) is arranged with pile body is concentric, and maintenance dish (3) diameter is greater than pile body diameter; Described pile body is divided into epimere pile body (4) and hypomere pile body (5), described epimere pile body (4) and hypomere pile body (5) are reverse frustoconic, the bottom surface of epimere pile body (4) is the end face of hypomere pile body (5), the tapering of described epimere pile body (4) is greater than the tapering of hypomere pile body (5), and described hypomere pile body (5) conical surface arranges screw thread (7).
2. double tapered Prefabricated post according to claim 1, is characterized in that: described screw thread (7) is angular thread.
3. double tapered Prefabricated post according to claim 1, is characterized in that: described pile crown top is retainer A, and described retainer A end face has cross recess (1).
4. double tapered Prefabricated post according to claim 3, it is characterized in that: described pile crown comprises retainer B (2), described retainer B (2) is located between retainer A and maintenance dish (3), and the diameter of retainer B (2) is less than the diameter of maintenance dish (3).
5. double tapered Prefabricated post according to claim 3, is characterized in that: the cross section of described retainer A is square, and the described foursquare length of side is less than the diameter of maintenance dish (3).
6. double tapered Prefabricated post according to claim 5, it is characterized in that: the end face of described retainer A and retainer B (2) is the inclined-plane downward-sloping gradually to edge from centre, the bottom surface of retainer A and retainer B (2) to be from centre to edge acclivitous inclined-plane gradually.
7. double tapered Prefabricated post according to claim 1, is characterized in that: described epimere pile body (4) basal diameter is 0.49mm ~ 1.23mm; The tapering of described epimere pile body (4) is 0.02 ~ 0.46; The tapering of described hypomere pile body (5) is 0.02 ~ 0.19.
8. double tapered Prefabricated post according to claim 7, is characterized in that: described epimere pile body (4) basal diameter is 0.9mm ~ 1.1mm; The tapering of described epimere pile body (4) is 0.05 ~ 0.2; The tapering of described hypomere pile body (5) is 0.02.
9. double tapered Prefabricated post according to claim 1, is characterized in that: the material of described double tapered Prefabricated post is Ti2448 alloy.
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| CN201520739657.XU CN205031373U (en) | 2015-09-22 | 2015-09-22 | Bipyramid degree becomes root canal stake in advance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105125299A (en) * | 2015-09-22 | 2015-12-09 | 四川大学 | Double-taper preformed root canal dowel |
| FR3060968A1 (en) * | 2016-12-23 | 2018-06-29 | Wans Services | RADICULAR TENON |
| CN108852543A (en) * | 2018-07-31 | 2018-11-23 | 四川大学 | A kind of oral cavity is slotting to cast and embeds with guide plate and its application method |
-
2015
- 2015-09-22 CN CN201520739657.XU patent/CN205031373U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105125299A (en) * | 2015-09-22 | 2015-12-09 | 四川大学 | Double-taper preformed root canal dowel |
| FR3060968A1 (en) * | 2016-12-23 | 2018-06-29 | Wans Services | RADICULAR TENON |
| CN108852543A (en) * | 2018-07-31 | 2018-11-23 | 四川大学 | A kind of oral cavity is slotting to cast and embeds with guide plate and its application method |
| CN108852543B (en) * | 2018-07-31 | 2023-10-03 | 四川大学 | Guide plate for oral cavity insert casting and embedding and use method thereof |
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