Main indications and clinical advantages
Although clinical practice has a number of limitations associated with the patient's general health status (which directly affects the quality of engraftment), the initial range of indications is based on the advantages of the method over classical prosthetics:
- Single defects: the ability to restore the dentition without grinding down or damaging adjacent healthy (intact) teeth.
- Complex defects: distal extension and extensive bounded defects where the installation of fixed structures by traditional methods is impossible.
- Complete edentulism: the method is a lifesaver in the complete absence of teeth, especially against the background of severe atrophy of the mandible. Implantation allows for full treatment even when the mental foramen (mental foramen) ends up right at the top of the alveolar ridge due to bone loss, rendering conventional removable dentures ineffective.
- Orthodontics and complex prosthetics: using implants as reliable supports during orthodontic treatment or maxillofacial prosthetics.
In addition, using implants as a support for a removable denture increases chewing efficiency by 40% and significantly slows down the rate of resorption of the surrounding bone tissue.
Osseointegration: the foundation of successful treatment
The primary task of the dental surgeon is to achieve osseointegration — the process of forming the densest, most durable contact between the surface of the metal (titanium) structure and the surrounding bone tissue.
Clinical and radiographic signs of successful integration include:
- Absolute immobility of the structure (formation of a kind of ankylosis).
- Tight bone apposition without signs of inflammation in the surrounding tissues.
- Physiological norm of all adjacent anatomical structures.
- On radiographs (e.g., orthopantomogram) and microscopically — visualization of tight bone apposition to the threads without the formation of a connective tissue gap (interval) or areas of bone rarefaction.
The success of this process depends on a whole complex of variables: from the patient's general somatic health to the filigree precision of the surgical technique and the accuracy of the subsequent orthopedic stage. However, the material and design features of the dental implant itself remain the primary factor.
Requirements for materials and surface
Materials for dental implants undergo the strictest selection. They must be non-toxic, completely corrosion-resistant, and highly durable. The most important condition is biomechanical compatibility, which is ensured by physical properties as close as possible to the natural tissues of the jaw.
Special attention is paid to the surface structure of the artificial root. It must be technologically advanced and promote protein adsorption, as well as active cell adhesion and fixation of the organic and mineral components of the bone matrix.
Classification and modern trends
In implantology, there are several basic types of designs depending on their positioning in the tissues:
- Transdental.
- Endosseous (intraosseous) — divided into screw, cylindrical, and plate.
- Subperiosteal.
- Intramucosal and mucosal.
- Transosseous.
In modern clinical practice, absolute preference is given to endosseous implantation using osseointegrated systems (as opposed to those that form a fibrosal connection). Axisymmetric models are recognized as the most studied and effective.
Why are screw implants preferred?
Among intraosseous models, screw designs have confidently supplanted cylindrical analogs due to a number of biomechanical advantages:
- Optimal area: with a comparable diameter, the screw shape has a larger outer surface area, which guarantees better support for the bone tissue.
- Reliable fixation: they provide excellent primary stability, which is significantly enhanced by bicortical anchorage.
- Immediate loading: their stability allows (subject to strict clinical requirements) functional loading simultaneously with placement.
- Atraumatic removal: in case of rejection or other complications, the screw implant can be removed as gently as possible by simply unscrewing it in the reverse direction.
Briefly: answers to topical questions
What are the absolute contraindications for dental implantation?
Absolute contraindications for dental implantation include:
- Chronic diseases in the stage of decompensation.
- Systemic coagulation and hemostasis disorders.
- HIV and any other seropositive infection.
- Mental illnesses.
What are the relative and local contraindications for dental implant placement?
Local contraindications and local risk factors for dental implant placement include:
- Oral pathologies: leukoplakia, stomatitis, xerostomia, caries, periodontitis, gingivitis, periodontal disease. Dental prophylaxis and appropriate treatment are required before implantation.
- For the single-stage technique: sharp bone ridge, insufficient initial implant stability, small amount of attached gingiva, need for guided bone regeneration.
- For immediate implantation: acute or chronic inflammatory process in the surgical area, tumor in the surgical area, insufficiency and laxity of the mucosa around the extracted tooth, major bone resorption.
The term "relative contraindications" is not used in the sources. Temporary contraindications requiring delayed intervention are identified: acute inflammatory diseases and viral infections, exacerbation of chronic diseases, pregnancy and lactation, treatment with drugs that impair tissue regeneration, and age under 18 years.
What factors influence the success of osseointegration?
The success of osseointegration depends on a complex of medical and technical variables. The following factors determine the quality of engraftment:
- Primary factor — the material and design features of the dental implant itself.
- Medical status — the patient's health condition.
- Surgical factor — the technique of the surgical intervention.
- Orthopedic factor — the accuracy of the subsequent orthopedic stage (prosthetics).
Class and exam questions
Does the patient's general health affect the indications for implantation?
Yes, the patient's health status is one of the fundamental factors determining the very feasibility of implant placement and the ultimate quality of its osseointegration.
What is osseointegration in simple terms?
This is the process of direct structural fusion of living bone tissue with the surface of the titanium implant without the formation of an intermediate soft (fibrous) layer.
What does a successfully integrated implant look like on an X-ray?
The orthopantomogram shows tight bone apposition to the threads; gaps, radiolucencies, and signs of surrounding bone rarefaction are completely absent.
What is the main advantage of screw implants over cylindrical ones?
They provide better primary and bicortical fixation, have a larger bone-to-implant contact area, and allow for immediate loading protocols.
What else to study on this topic
- Fundamental discoveries by P.I. Brånemark in the field of dental implantology
- Specifics of the orthopedic stage in complete edentulism and mandibular atrophy
- Features of bone matrix cell adhesion to the titanium surface
- Protocols for immediate functional loading of screw implants
Master the entire topic in the course "Surgical Dentistry"
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- Complete study guide on "Indications and Contraindications for Dental Implantation" and 866 more pages on the subject
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Other topics from the section "Chapter 17. Dental Implantology (V.I. Olesova)"
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