阅读说明：本技术 一种牙科矫治系统的设计方法及牙科矫治器械的设计系统 (Design method of dental correcting system and design system of dental correcting instrument ) 是由 刘珊珊 王星星 赵晓磊 姚峻峰 于 2019-09-20 设计创作，主要内容包括：一种牙科矫治系统的设计方法及牙科矫治器械的设计系统,设计方法包括：获取第一初始牙颌数字模型,获取第一初始牙颌数字模型后牙区咬合面上设置的凸起部模型,生成具有凸起部的一体化牙颌数字模型,基于该一体化牙颌数字模型生成第一壳状牙科器械,获取第二初始牙颌数字模型,根据第二初始牙颌数字模型设计第二壳状牙科器械。设计的第一壳状牙科器械和第二壳状牙科器械之间凸起部和限位部配合,使得第一壳状牙科器械和第二壳状牙科器械在咬合时,进行上下颌的咬合重建,同时使下颌切牙与上颌切牙趋于对齐,上下颌的咬合相对位置更加稳定,凸起部的设计不仅能够对患者的下颌具有打开患者的咬合的效果,还具有咬合诱导作用,避免前牙区的矫治限制。(A design method of a dental correcting system and a design system of a dental correcting apparatus are provided, wherein the design method comprises the following steps: the method comprises the steps of obtaining a first initial dental digital model, obtaining a protruding part model arranged on an occlusal surface of a tooth area behind the first initial dental digital model, generating an integrated dental digital model with a protruding part, generating a first shell-shaped dental instrument based on the integrated dental digital model, obtaining a second initial dental digital model, and designing the second shell-shaped dental instrument according to the second initial dental digital model. Bellying and spacing cooperation between first shell form dental instrument of design and the second shell form dental instrument for first shell form dental instrument and second shell form dental instrument are when the interlock, carry out the interlock of jaw and down and rebuild, make lower jaw incisor and upper jaw incisor tend to align simultaneously, the interlock relative position of jaw and down is more stable, the design of bellying not only can have the effect of opening patient's interlock to patient's lower jaw, still has interlock induction, avoid the restriction of correcting in anterior teeth district.)

1. A design method of a dental correcting system is characterized by comprising the following steps:

acquiring a first initial dental digital model;

acquiring a bulge model arranged on the occlusal surface of the tooth area behind the first initial dental digital model, specifically acquiring characteristic information of the bulge; the feature information comprises the size and the preset position of the protruding part, and the protruding part is arranged facing the occlusal surface of the opposite jaw teeth and is arranged in a concave-convex matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth or is arranged in a meshing matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth;

generating an integrated dental digital model having a projection based on the first initial dental digital model and the projection model;

designing a first shell-shaped dental instrument based on the integrated dental jaw digital model with the convex parts, so that the first shell-shaped dental instrument is in a shell shape with a cavity for accommodating a first dentition, and a back tooth area of the first shell-shaped dental instrument is provided with the convex parts protruding towards the opposite jaw direction;

acquiring a second initial dental digital model;

and designing the second shell-shaped dental instrument according to the second initial dental digital model so that the second shell-shaped dental instrument is in a shell shape with a cavity for accommodating a second dentition, and the second shell-shaped dental instrument is provided with a limiting part matched with the convex part of the first shell-shaped dental instrument.

2. The method of claim 1, wherein the protrusion of the first shell-like dental instrument is positioned at a height perpendicular to the occlusal surface such that the mandibular and maxillary incisors tend to align when the first and second shell-like dental instruments are occluded.

3. The method of claim 1, wherein the portion of the protrusion facing the occlusal surface of the maxillary dentition is further provided with a friction portion.

4. The method of claim 3, wherein the friction portion is one, two or more of a frosted surface structure, a raised point structure, a hollowed surface structure, or a perforated surface structure.

5. The method of claim 1, wherein the designing of the first shell-shaped dental appliance based on the integrated digital model of dental jaw with the convex portion further comprises a step of designing a traction portion so that the designed dental appliance performs extramaxillary or mandibular traction through the traction portion.

6. The method of designing a dental appliance system of claim 5, wherein the step of designing the traction portion comprises:

determining a preset position of a traction part to be arranged on the dental instrument, wherein the dental instrument is designed based on the integrated dental jaw digital model with the convex part;

and arranging the traction part on the dental instrument according to a preset position.

7. The method of claim 6, wherein the dental appliance has a structure configured to engage the retractor.

8. The method of designing a dental appliance system of claim 5, wherein the step of designing the traction portion comprises:

acquiring the size of a traction part to be set in the integrated dental digital model with the protruding part and the preset position of the traction part in the integrated dental digital model with the protruding part;

placing a traction part model which accords with the size on the integrated dental digital model with the convex part according to a preset position;

generating an integrated dental digital model with a convex part and a traction part based on the integrated dental digital model with the convex part and the traction part model;

designing the first shell-like dental instrument based on the integrated dental digital model having the protruding portion and the pulling portion.

9. The method of claim 1, wherein designing the first shell dental appliance based on the raised integrated dental digital model further comprises designing a retainer so that the first shell dental appliance is prevented from falling off the tooth to which the first shell dental appliance is mated by the retainer snapping to the retainer.

10. The method of designing a dental appliance system of claim 9, wherein the retainer is designed by:

acquiring the size of a retainer to be arranged in the integrated dental digital model with the protruding part, and the preset position and the preset direction of the retainer in the integrated dental digital model with the protruding part;

arranging a retaining part model according with the size on the integrated dental digital model with the convex part according to a preset position and a preset direction;

generating an integrated dental digital model with a protruding part and a retaining part based on the integrated dental digital model with the protruding part and the retaining part model;

designing the first shell-like dental instrument based on the integrated digital dental model having the raised portion and the retention portion.

11. The method of claim 10, wherein the retainer has at least two surfaces, one of which increases the retention force between the first shell dental appliance and the tooth when the first shell dental appliance is in contact with the tooth.

12. The method of claim 11, wherein the force applying surface of the retainer is perpendicular to the direction of distraction.

13. The method of claim 11, wherein the retainers are provided on a buccal surface and/or a lingual surface of the posterior dental zone.

14. The method of claim 10, wherein designing the first shell dental appliance based on the integrated dental digital model comprises designing a traction portion such that the first shell dental appliance is designed to have a protrusion portion, a retention portion and a traction portion.

15. The method of designing a dental appliance system of claim 14, wherein the traction portion is designed by:

determining a preset position of a traction part to be arranged on the dental instrument, wherein the dental instrument is a first shell-shaped dental instrument designed on the basis of the integrated dental digital model with the protruding part and the retention part;

and arranging the traction part on the dental instrument according to a preset position.

16. The method of designing a dental appliance system of claim 14, wherein the traction portion is designed by:

acquiring the size of a traction part to be arranged in the integrated dental digital model with the protruding part and the fixing part and the preset position of the traction part in the integrated dental digital model with the protruding part and the fixing part;

placing a traction part model which accords with the size on the integrated dental digital model with the protruding part and the fixing part according to a preset position;

generating an integrated dental digital model with a protruding part, a fixing part and a traction part based on the integrated dental digital model with the protruding part and the fixing part and the traction part model;

designing the first shell-like dental instrument based on the integrated dental digital model having the protruding portion, the retaining portion, and the traction portion.

17. The method of claim 1, wherein the stop is an opening or a projection toward the jaw.

18. The method of claim 17, wherein a portion of the projection facing the first shell dental implement is provided with a friction enhancing reinforcement for the first shell dental implement.

19. The method of claim 18, wherein the reinforcement portion is one, two, or a combination of two or more of a structure having a frosted surface, a structure having a raised point, or a structure having a hollowed surface.

20. The method of designing a dental correction system of claim 1, wherein the first shell dental appliance and/or the second shell dental appliance is a shell having a non-uniform thickness.

21. The method of designing a dental correction system of claim 1, wherein the first shell dental appliance and/or the second shell dental appliance has a thickness of 0.1mm to 2.0 mm.

22. A design system for a dental appliance comprising a first shell dental appliance and a second shell dental appliance, the design system comprising:

a first design module for designing the first shell-like dental instrument performing the following operations:

acquiring a first initial dental digital model;

acquiring a bulge model arranged on the occlusal surface of the tooth area behind the first initial dental digital model, specifically acquiring characteristic information of the bulge; the feature information comprises the size and the preset position of the protruding part, and the protruding part is arranged facing the occlusal surface of the opposite jaw teeth and is arranged in a concave-convex matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth or is arranged in a meshing matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth;

generating an integrated dental digital model having a projection based on the first initial dental digital model and the projection model;

designing a first shell-shaped dental instrument based on the integrated dental jaw digital model with the convex parts, so that the first shell-shaped dental instrument is in a shell shape with a cavity for accommodating a first dentition, and a back tooth area of the first shell-shaped dental instrument is provided with the convex parts protruding towards the opposite jaw direction;

a second design module for designing the second shell-like dental instrument performing the following operations:

acquiring a second initial dental digital model;

and designing the second shell-shaped dental instrument according to the second initial dental digital model so that the second shell-shaped dental instrument is in a shell shape with a cavity for accommodating a second dentition, and the second shell-shaped dental instrument is provided with a limiting part matched with the convex part of the first shell-shaped dental instrument.

Technical Field

The invention relates to the technical field of medical appliances, in particular to a tooth correcting system design technology, and particularly relates to a design method of a dental correcting system and a design system of a dental correcting apparatus.

Background

The term occlusions (occlusions) is a term specific to oral medicine. occlusion in the webster dictionary means that the opposing surfaces of the upper and lower jaw teeth are brought together. In the past, "occlusions" were used to indicate the contact of the upper and lower teeth when the lower jaw is stationary, while occlusions (occlusions) were used to indicate the contact of the upper and lower teeth when the lower jaw is moving. In the modern concept of oral profession, the above two meanings of movement and inertia are included, namely, in some cases, the meaning is common to occlusion.

Malocclusion refers to congenital genetic factors or acquired environmental factors such as diseases, bad habits of the oral cavity, dysdonia of tooth replacement, etc., and may also be caused by trauma and periodontal diseases after growth, such as misalignment of teeth, abnormal occlusion of upper and lower dental arches, abnormal size and position of jaw, facial deformity, etc. The factors and mechanisms of malocclusion are intricate, and the process of occurrence may be effected by a single factor and a single mechanism, or may be the result of multiple factors or multiple mechanisms acting together. The pathogenesis of the malocclusion deformity can be divided into two categories, namely congenital factors and acquired factors, from the time of the formation of the malocclusion deformity, but aiming at the generation mechanism of the individual malocclusion deformity, the pathogenesis of the malocclusion deformity can be divided into internal genetic factors and external environmental factors.

The three types of malocclusion of Anshi are caused by the abnormal relation between the upper and lower jawbone and dental arch, the lower jaw and lower dental arch are in the middle position, and the molar is in the middle relation; if the mandible is advanced by a distance of 1/4 molars or half of a premolar, i.e., the mesial buccal tip of the upper first constant molar is opposite the distal buccal tip of the lower first constant molar, a mild mesio-malocclusion relationship or onset of mesio-malocclusion is referred to. If the lower jaw or arch is in a more mesial position such that the mesial buccal tip of the first permanent molar of the upper jaw bites between the first and second permanent molar of the lower jaw, called fully mesial malocclusion, three types of river crossings can be expressed as anterior to jaw, underbite or open jaw, maxillary retraction or mandibular protrusion, etc. The facial changes exhibited in some cases are concave deformities.

The concave deformity can be divided into alveolar, maxillofacial and bone-derived concave deformities, wherein the clinical manifestations of the alveolar concave deformity are that the side surface is slightly concave, the lateral area of the nose is seen from the front, the steepness of the lower jaw is normal without collapse, the front teeth are less repeatedly covered, and the molar is slightly in-line, which is mainly caused by the local factors of the alveolar, the maxilla is normal, and the lower jaw is preferably rectangular in shape.

The clinical manifestations of the concave deformity of jaw position are obvious concave surface in side view, normal lower jaw steepness, repeated and large overlapping of anterior teeth, deep closure of lower jaw, receding of lower jaw to the anterior area, facing of upper and lower incisor, molar mesiodial relation, which is mainly caused by the inertia of lower jaw, insufficient development of upper jaw, and the retroversion of upper jaw mainly caused by jaw position factor, slight retroversion of upper jaw, and better and rectangular shape of lower jaw.

The bone source concave deformity is divided into three types: the clinical manifestations of the upper jaw source type are that the concave surface is obvious in side view, the collapse of the nasal side area is obvious in front view, the lower jaw steepness is normal, the front tooth coverage is large, the back tooth coverage is small, the molar mesial relationship is mainly caused by the fact that the upper jaw is insufficient in all directions, the tooth socket and the basal bone are compensated in the reverse direction, a tooth socket and a basal bone moving position are formed to be sunken, the upper jaw is insufficient, and the lower jaw is good in shape and rectangular; the clinical manifestations of the lower jaw source type are that the upper jaw is normal, the lower jaw plane steepness is large, the concave surface is obvious, the front tooth underbite coverage is small, the back tooth area is covered repeatedly, molar is in a mesial relation, the lower jaw is in all-around transition, the tooth space and the jaw are compensated reversely, so that the lower front tooth is upright or tongue-inclined, the upper jaw is slightly retracted, the lower jaw is not in good shape, becomes thick and heavy triangle, the shallow recess is convergent backwards, and the deep recess is protruded forwards; the clinical manifestations of the upper and lower origin type are that the upper and lower parts contract upwards and downwards and protrude upwards and downwards in the side view, the lateral area of the nose is sunken, the anterior teeth are small in repeated coverage, the posterior teeth area is in repeated coverage, and molar teeth are in complete mesial relationship, which is mainly characterized in that the upper jaw is lack of all-dimensional development, the lower jaw is excessive in all-dimensional development, the upper jaw is obvious in retroreduction, the lower jaw is not good in shape, and is in a thick and heavy triangle, the shallow recess converges backwards, and the deep recess is protrusive forwards.

For the case of concave surface deformity, the invisible appliance is adopted for treatment in the whole process, the treatment needs to be completed by means of other dental auxiliary equipment, such as a front tractor, a traction hook and the like, the shape of the invisible appliance can be changed correspondingly in the process, and the invisible appliance prepared by the design method for the invisible appliance with the concave surface deformity can be directly designed on the invisible appliance, the treatment effect cannot be predicted for the type and the position of the added dental auxiliary equipment, the invisible appliance is directly prepared and worn by a patient, the treatment result is determined only by the clinical experience of a clinician, so the treatment risk exists, the improvement is performed on the invisible appliance, the verification of different effects can be performed on the expected treatment effect, and the treatment risk can be effectively reduced.

Therefore, the method for designing the dental instrument for adjusting the jaw position relation with safety, comfort and convenience has important significance.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a design method of a dental correcting system, which is used for completing the design of different correcting effects, so that the dental correcting system is more in line with the optimal scheme of correcting design, and the correcting accuracy of a patient is improved.

The invention also provides a design system of the dental appliance, which can be used for designing the dental appliance individually according to the needs of patients.

The technical scheme of the invention is as follows:

a design method of a dental correcting system is provided, which comprises the following steps:

acquiring a first initial dental digital model;

acquiring a bulge model arranged on the occlusal surface of the tooth area behind the first initial dental digital model, specifically acquiring characteristic information of the bulge; the feature information comprises the size and the preset position of the protruding part, and the protruding part is arranged facing the occlusal surface of the opposite jaw teeth and is arranged in a concave-convex matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth or is arranged in a meshing matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth;

generating an integrated dental digital model having a projection based on the first initial dental digital model and the projection model;

designing a first shell-shaped dental instrument based on the integrated dental jaw digital model with the convex parts, so that the first shell-shaped dental instrument is in a shell shape with a cavity for accommodating a first dentition, and a back tooth area of the first shell-shaped dental instrument is provided with the convex parts protruding towards the opposite jaw direction;

acquiring a second initial dental digital model;

and designing the second shell-shaped dental instrument according to the second initial dental digital model so that the second shell-shaped dental instrument is in a shell shape with a cavity for accommodating a second dentition, and the second shell-shaped dental instrument is provided with a limiting part matched with the convex part of the first shell-shaped dental instrument.

Further, the arrangement height of the convex part arranged on the first shell-shaped dental instrument in the direction vertical to the occlusal surface can enable the lower jaw incisor and the upper jaw incisor to tend to be aligned when the first shell-shaped dental instrument and the second shell-shaped dental instrument are occluded.

Furthermore, a friction part is arranged on the part of the bulge part facing to the occlusal surface of the jaw dentition.

Further, the friction part is one or a combination of two or more of a structure with a frosted surface on the surface, a structure with salient points on the surface, a structure with a hollowed surface or a structure with a hole surface.

Furthermore, in the process of designing the first shell-shaped dental instrument based on the integrated dental jaw digital model with the convex part, the design method further comprises a design step of a traction part, so that the designed dental instrument performs extramaxillary traction or intermaxillary traction through the traction part.

Further, the design steps of the traction part are as follows:

determining a preset position of a traction part to be arranged on the dental instrument, wherein the dental instrument is designed based on the integrated dental jaw digital model with the convex part;

and arranging the traction part on the dental instrument according to a preset position.

Furthermore, a structure which is matched with the traction part for installation is arranged on the dental instrument.

Further, the design steps of the traction part are as follows:

acquiring the size of a traction part to be set in the integrated dental digital model with the protruding part and the preset position of the traction part in the integrated dental digital model with the protruding part;

placing a traction part model which accords with the size on the integrated dental digital model with the convex part according to a preset position;

generating an integrated dental digital model with a convex part and a traction part based on the integrated dental digital model with the convex part and the traction part model;

designing the first shell-like dental instrument based on the integrated dental digital model having the protruding portion and the pulling portion.

Further, in the process of designing the first shell-shaped dental instrument based on the integrated dental jaw digital model with the convex part, the design method further comprises a step of designing a retainer part, so that the designed first shell-shaped dental instrument is prevented from falling off from the matched teeth by buckling the retainer part and the retainer accessory.

Further, the design steps of the retainer are as follows:

acquiring the size of a retainer to be arranged in the integrated dental digital model with the protruding part, and the preset position and the preset direction of the retainer in the integrated dental digital model with the protruding part;

arranging a retaining part model according with the size on the integrated dental digital model with the convex part according to a preset position and a preset direction;

generating an integrated dental digital model with a protruding part and a retaining part based on the integrated dental digital model with the protruding part and the retaining part model;

designing the first shell-like dental instrument based on the integrated digital dental model having the raised portion and the retention portion.

Further, the retainer has at least two surfaces, one of which increases the retention force between the dental appliance and the tooth when the first shell-like dental appliance is in contact with the tooth.

Further, the force application surface of the retainer is perpendicular to the traction direction.

Further, the fixture is provided on a buccal surface and/or a lingual surface of the posterior tooth zone.

Further, in the process of designing the first shell-shaped dental instrument based on the integrated dental digital model with the protruding part and the retaining part, a design step of a traction part is also included, so that the designed dental instrument has the protruding part, the retaining part and the traction part.

Further, the design steps of the traction part are as follows:

determining a preset position of a traction part to be arranged on the dental instrument, wherein the dental instrument is a first shell-shaped dental instrument designed on the basis of the integrated dental digital model with the protruding part and the retention part;

and arranging the traction part on the dental instrument according to a preset position.

Further, the design steps of the traction part are as follows:

acquiring the size of a traction part to be arranged in the integrated dental digital model with the protruding part and the fixing part and the preset position of the traction part in the integrated dental digital model with the protruding part and the fixing part;

placing a traction part model which accords with the size on the integrated dental digital model with the protruding part and the fixing part according to a preset position;

generating an integrated dental digital model with a protruding part, a fixing part and a traction part based on the integrated dental digital model with the protruding part and the fixing part and the traction part model;

designing the first shell-like dental instrument based on the integrated dental digital model having the protruding portion, the retaining portion, and the traction portion.

Furthermore, the limiting part is an opening or a second bulge facing the jaw direction.

Further, the part of the second boss facing the first shell-shaped dental instrument is provided with a reinforcing part for increasing friction with the first shell-shaped dental instrument.

Further, the reinforcing part is one or a combination of two or more of a structure with a frosted surface on the surface, a structure with salient points on the surface or a structure with a hollowed-out surface.

Further, the first shell-like dental instrument and/or the second shell-like dental instrument is a shell having a non-uniform thickness.

Further, the first shell-like dental instrument and/or the second shell-like dental instrument has a thickness of 0.1mm to 2.0 mm.

According to a second aspect, there is provided a design system for a dental appliance comprising a first shell dental appliance and a second shell dental appliance, the design system comprising:

a first design module for designing the first shell-like dental instrument performing the following operations:

acquiring a first initial dental digital model;

acquiring a bulge model arranged on the occlusal surface of the tooth area behind the first initial dental digital model, specifically acquiring characteristic information of the bulge; the feature information comprises the size and the preset position of the protruding part, and the protruding part is arranged facing the occlusal surface of the opposite jaw teeth and is arranged in a concave-convex matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth or is arranged in a meshing matching manner with the occlusal surface of the back tooth area of the opposite jaw teeth;

generating an integrated dental digital model having a projection based on the first initial dental digital model and the projection model;

designing a first shell-shaped dental instrument based on the integrated dental jaw digital model with the convex parts, so that the first shell-shaped dental instrument is in a shell shape with a cavity for accommodating a first dentition, and a back tooth area of the first shell-shaped dental instrument is provided with the convex parts protruding towards the opposite jaw direction;

a second design module for designing the second shell-like dental instrument performing the following operations:

acquiring a second initial dental digital model;

and designing the second shell-shaped dental instrument according to the second initial dental digital model so that the second shell-shaped dental instrument is in a shell shape with a cavity for accommodating a second dentition, and the second shell-shaped dental instrument is provided with a limiting part matched with the convex part of the first shell-shaped dental instrument.

The design method of the dental correcting system and the design system of the dental correcting apparatus provided by the invention have the following beneficial effects:

1) the first shell-shaped dental instrument is provided with the protruding part, the second shell-shaped dental instrument is provided with the limiting part, and the protruding part and the limiting part are designed in a matching way, so that when the first shell-shaped dental instrument and the second shell-shaped dental instrument are occluded, the protruding part is contacted with the limiting part, occlusion reconstruction of upper and lower jaws is carried out, lower jaw incisors and upper jaw incisors tend to align, the relative occlusion positions of the upper and lower jaws are more stable, the design of the protruding part not only can have the effect of opening the occlusion of a patient on the lower jaw of the patient, but also has an occlusion inducing effect, and the correction limitation of a front tooth area is avoided;

2) a traction part is designed on the first shell-shaped dental appliance, so that the jaw external traction or the jaw traction can be performed when the jaw bone is reshaped;

3) design the maintenance portion on first shell form dental appliance, can increase the area of contact and the relative retention force of dental appliance and tooth, prevent that first shell form dental appliance from taking place to drop wearing the process, when setting up traction portion and maintenance portion simultaneously, the maintenance portion can also cooperate with traction portion, when pulling, traction portion and place ahead tractor or intermaxillary traction element pull and be connected, traction portion pulls the shell form body and drives the tooth and remove, traction portion is as the application of force side, the maintenance portion is perpendicular with the application of force direction that the whole interact of maintenance annex was regarded as traction portion, its application of force direction that produces with traction portion, avoids shell form body to take place deformation and take place to dislocate with the tooth at the in-process of pulling.

Drawings

The foregoing features, technical features, advantages and embodiments are further described in the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings.

FIG. 1 is a flow chart of a method for designing a dental correction system according to a first embodiment;

FIG. 2 is a schematic view of a dental instrument according to one design of the present invention;

FIG. 3 is a flow chart of a method for designing a dental correction system according to the second embodiment;

FIG. 4 is a schematic structural view of a dental implement designed according to example two;

FIG. 5 is a flow chart of a method for designing a dental correction system according to a third embodiment;

FIG. 6 is a schematic structural view of a dental implement according to a third embodiment;

FIG. 7 is a flow chart of a method for designing a dental correction system according to a fourth embodiment;

FIG. 8 is a schematic structural view of a dental implement according to a fourth embodiment.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.