Zirconia implants and peek restorations for the replacement of upper molars
Identifieur interne : 000974 ( Pmc/Corpus ); précédent : 000973; suivant : 000975Zirconia implants and peek restorations for the replacement of upper molars
Auteurs : José María Parmigiani-Izquierdo ; María Eugenia Caba A-Mu Oz ; José Joaquín Merino ; Arturo Sánchez-PérezSource :
- International Journal of Implant Dentistry [ 2198-4034 ] ; 2017.
Abstract
One of the disadvantages of the zirconia implants is the lack of elasticity, which is increased with the use of ceramic or zirconia crowns. The consequences that could result from this lack of elasticity have led to the search for new materials with improved mechanical properties.
A patient who is a 45-year-old woman, non-smoker and has no medical record of interest with a longitudinal fracture in the palatal root of molar tooth 1.7 and absence of tooth 1.6 was selected in order to receive a zirconia implant with a PEEK-based restoration and a composite coating. The following case report describes and analyses treatment with zirconia implants in molars following a flapless surgical technique. Zirconia implants are an alternative to titanium implants in patients with allergies or who are sensitive to metal alloys. However, one of the disadvantages that they have is their lack of elasticity, which increases with the use of ceramic or zirconia crowns. The consequences that can arise from this lack of elasticity have led to the search for new materials with better mechanical properties to cushion occlusal loads. PEEK-based restoration in implant prosthetics can compensate these occlusal forces, facilitating cushioning while chewing.
This procedure provides excellent elasticity and resembles natural tooth structure. This clinical case suggests that PEEK restorations can be used in zirconia implants in dentistry.
Url:
DOI: 10.1186/s40729-016-0062-2
PubMed: 28220366
PubMed Central: 5318309
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Zirconia implants and peek restorations for the replacement of upper molars</title><author><name sortKey="Parmigiani Izquierdo, Jose Maria" sort="Parmigiani Izquierdo, Jose Maria" uniqKey="Parmigiani Izquierdo J" first="José María" last="Parmigiani-Izquierdo">José María Parmigiani-Izquierdo</name><affiliation><nlm:aff id="Aff2">Clínica CIROM, Murcia, 30001 Spain</nlm:aff></affiliation></author><author><name sortKey="Caba A Mu Oz, Maria Eugenia" sort="Caba A Mu Oz, Maria Eugenia" uniqKey="Caba A Mu Oz M" first="María Eugenia" last="Caba A-Mu Oz">María Eugenia Caba A-Mu Oz</name><affiliation><nlm:aff id="Aff2">Clínica CIROM, Murcia, 30001 Spain</nlm:aff></affiliation></author><author><name sortKey="Merino, Jose Joaquin" sort="Merino, Jose Joaquin" uniqKey="Merino J" first="José Joaquín" last="Merino">José Joaquín Merino</name><affiliation><nlm:aff id="Aff2">Clínica CIROM, Murcia, 30001 Spain</nlm:aff></affiliation></author><author><name sortKey="Sanchez Perez, Arturo" sort="Sanchez Perez, Arturo" uniqKey="Sanchez Perez A" first="Arturo" last="Sánchez-Pérez">Arturo Sánchez-Pérez</name><affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0001 2287 8496</institution-id><institution-id institution-id-type="GRID">grid.10586.3a</institution-id><institution>Periodontics Unit, Faculty of Medicine and Dentistry,</institution><institution>University of Murcia (Spain),</institution></institution-wrap>Murcia, Spain</nlm:aff></affiliation><affiliation><nlm:aff id="Aff3"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1765 5898</institution-id><institution-id institution-id-type="GRID">grid.411101.4</institution-id><institution>Clínica Odontologíca Universitaria,</institution><institution>Hospital Morales Meseguer,</institution></institution-wrap>2ª planta, C/ Marqués de los Vélez s/n, Murcia, 30008 Spain</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">28220366</idno><idno type="pmc">5318309</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5318309</idno><idno type="RBID">PMC:5318309</idno><idno type="doi">10.1186/s40729-016-0062-2</idno><date when="2017">2017</date><idno type="wicri:Area/Pmc/Corpus">000974</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000974</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Zirconia implants and peek restorations for the replacement of upper molars</title><author><name sortKey="Parmigiani Izquierdo, Jose Maria" sort="Parmigiani Izquierdo, Jose Maria" uniqKey="Parmigiani Izquierdo J" first="José María" last="Parmigiani-Izquierdo">José María Parmigiani-Izquierdo</name><affiliation><nlm:aff id="Aff2">Clínica CIROM, Murcia, 30001 Spain</nlm:aff></affiliation></author><author><name sortKey="Caba A Mu Oz, Maria Eugenia" sort="Caba A Mu Oz, Maria Eugenia" uniqKey="Caba A Mu Oz M" first="María Eugenia" last="Caba A-Mu Oz">María Eugenia Caba A-Mu Oz</name><affiliation><nlm:aff id="Aff2">Clínica CIROM, Murcia, 30001 Spain</nlm:aff></affiliation></author><author><name sortKey="Merino, Jose Joaquin" sort="Merino, Jose Joaquin" uniqKey="Merino J" first="José Joaquín" last="Merino">José Joaquín Merino</name><affiliation><nlm:aff id="Aff2">Clínica CIROM, Murcia, 30001 Spain</nlm:aff></affiliation></author><author><name sortKey="Sanchez Perez, Arturo" sort="Sanchez Perez, Arturo" uniqKey="Sanchez Perez A" first="Arturo" last="Sánchez-Pérez">Arturo Sánchez-Pérez</name><affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0001 2287 8496</institution-id><institution-id institution-id-type="GRID">grid.10586.3a</institution-id><institution>Periodontics Unit, Faculty of Medicine and Dentistry,</institution><institution>University of Murcia (Spain),</institution></institution-wrap>Murcia, Spain</nlm:aff></affiliation><affiliation><nlm:aff id="Aff3"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1765 5898</institution-id><institution-id institution-id-type="GRID">grid.411101.4</institution-id><institution>Clínica Odontologíca Universitaria,</institution><institution>Hospital Morales Meseguer,</institution></institution-wrap>2ª planta, C/ Marqués de los Vélez s/n, Murcia, 30008 Spain</nlm:aff></affiliation></author></analytic><series><title level="j">International Journal of Implant Dentistry</title><idno type="eISSN">2198-4034</idno><imprint><date when="2017">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background</title><p>One of the disadvantages of the zirconia implants is the lack of elasticity, which is increased with the use of ceramic or zirconia crowns. The consequences that could result from this lack of elasticity have led to the search for new materials with improved mechanical properties.</p></sec><sec><title>Case presentation</title><p>A patient who is a 45-year-old woman, non-smoker and has no medical record of interest with a longitudinal fracture in the palatal root of molar tooth 1.7 and absence of tooth 1.6 was selected in order to receive a zirconia implant with a PEEK-based restoration and a composite coating. The following case report describes and analyses treatment with zirconia implants in molars following a flapless surgical technique. Zirconia implants are an alternative to titanium implants in patients with allergies or who are sensitive to metal alloys. However, one of the disadvantages that they have is their lack of elasticity, which increases with the use of ceramic or zirconia crowns. The consequences that can arise from this lack of elasticity have led to the search for new materials with better mechanical properties to cushion occlusal loads. PEEK-based restoration in implant prosthetics can compensate these occlusal forces, facilitating cushioning while chewing.</p></sec><sec><title>Conclusion</title><p>This procedure provides excellent elasticity and resembles natural tooth structure. This clinical case suggests that PEEK restorations can be used in zirconia implants in dentistry.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Br Nemark, Pi" uniqKey="Br Nemark P">PI Brånemark</name></author><author><name sortKey="Hansson, Bo" uniqKey="Hansson B">BO Hansson</name></author><author><name sortKey="Adell, R" uniqKey="Adell R">R Adell</name></author><author><name sortKey="Breine, U" uniqKey="Breine U">U Breine</name></author><author><name sortKey="Lindstrom, J" uniqKey="Lindstrom J">J Lindström</name></author><author><name sortKey="Hallen, O" uniqKey="Hallen O">O Hallén</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Parmigiani Izquierdo, Jm" uniqKey="Parmigiani Izquierdo J">JM Parmigiani-Izquierdo</name></author><author><name sortKey="Sanchez Perez, A" uniqKey="Sanchez Perez A">A Sánchez-Pérez</name></author><author><name sortKey="Caba A Mu Oz, Me" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Int J Implant Dent</journal-id><journal-id journal-id-type="iso-abbrev">Int J Implant Dent</journal-id><journal-title-group><journal-title>International Journal of Implant Dentistry</journal-title></journal-title-group><issn pub-type="epub">2198-4034</issn><publisher><publisher-name>Springer Berlin Heidelberg</publisher-name><publisher-loc>Berlin/Heidelberg</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">28220366</article-id><article-id pub-id-type="pmc">5318309</article-id><article-id pub-id-type="publisher-id">62</article-id><article-id pub-id-type="doi">10.1186/s40729-016-0062-2</article-id><article-categories><subj-group subj-group-type="heading"><subject>Case Report</subject></subj-group></article-categories><title-group><article-title>Zirconia implants and peek restorations for the replacement of upper molars</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Parmigiani-Izquierdo</surname><given-names>José María</given-names></name><xref ref-type="aff" rid="Aff2">2</xref></contrib><contrib contrib-type="author"><name><surname>Cabaña-Muñoz</surname><given-names>María Eugenia</given-names></name><xref ref-type="aff" rid="Aff2">2</xref></contrib><contrib contrib-type="author"><name><surname>Merino</surname><given-names>José Joaquín</given-names></name><xref ref-type="aff" rid="Aff2">2</xref></contrib><contrib contrib-type="author" corresp="yes"><name><surname>Sánchez-Pérez</surname><given-names>Arturo</given-names></name><address><phone>+34968247946</phone><email>arturosa@um.es</email></address><xref ref-type="aff" rid="Aff1">1</xref><xref ref-type="aff" rid="Aff3">3</xref></contrib><aff id="Aff1"><label>1</label><institution-wrap><institution-id institution-id-type="ISNI">0000 0001 2287 8496</institution-id><institution-id institution-id-type="GRID">grid.10586.3a</institution-id><institution>Periodontics Unit, Faculty of Medicine and Dentistry,</institution><institution>University of Murcia (Spain),</institution></institution-wrap>Murcia, Spain</aff><aff id="Aff2"><label>2</label>Clínica CIROM, Murcia, 30001 Spain</aff><aff id="Aff3"><label>3</label><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1765 5898</institution-id><institution-id institution-id-type="GRID">grid.411101.4</institution-id><institution>Clínica Odontologíca Universitaria,</institution><institution>Hospital Morales Meseguer,</institution></institution-wrap>2ª planta, C/ Marqués de los Vélez s/n, Murcia, 30008 Spain</aff></contrib-group><pub-date pub-type="epub"><day>20</day><month>2</month><year>2017</year></pub-date><pub-date pub-type="pmc-release"><day>20</day><month>2</month><year>2017</year></pub-date><pub-date pub-type="collection"><month>12</month><year>2017</year></pub-date><volume>3</volume><elocation-id>5</elocation-id><history><date date-type="received"><day>13</day><month>10</month><year>2016</year></date><date date-type="accepted"><day>22</day><month>12</month><year>2016</year></date></history><permissions><copyright-statement>© The Author(s). 2017</copyright-statement><license license-type="OpenAccess"><license-p><bold>Open Access</bold>This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.</license-p></license></permissions><abstract id="Abs1"><sec><title>Background</title><p>One of the disadvantages of the zirconia implants is the lack of elasticity, which is increased with the use of ceramic or zirconia crowns. The consequences that could result from this lack of elasticity have led to the search for new materials with improved mechanical properties.</p></sec><sec><title>Case presentation</title><p>A patient who is a 45-year-old woman, non-smoker and has no medical record of interest with a longitudinal fracture in the palatal root of molar tooth 1.7 and absence of tooth 1.6 was selected in order to receive a zirconia implant with a PEEK-based restoration and a composite coating. The following case report describes and analyses treatment with zirconia implants in molars following a flapless surgical technique. Zirconia implants are an alternative to titanium implants in patients with allergies or who are sensitive to metal alloys. However, one of the disadvantages that they have is their lack of elasticity, which increases with the use of ceramic or zirconia crowns. The consequences that can arise from this lack of elasticity have led to the search for new materials with better mechanical properties to cushion occlusal loads. PEEK-based restoration in implant prosthetics can compensate these occlusal forces, facilitating cushioning while chewing.</p></sec><sec><title>Conclusion</title><p>This procedure provides excellent elasticity and resembles natural tooth structure. This clinical case suggests that PEEK restorations can be used in zirconia implants in dentistry.</p></sec></abstract><kwd-group xml:lang="en"><title>Keywords</title><kwd>Dental implants</kwd><kwd>Zirconia</kwd><kwd>Osseointegration</kwd><kwd>Ceramics</kwd><kwd>Polyether ketone</kwd><kwd>Elastic modudus</kwd></kwd-group><custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name><meta-value>© The Author(s) 2017</meta-value></custom-meta></custom-meta-group></article-meta></front><body><sec id="Sec1"><title>Background</title><p>In the field of implant dentistry, the most widely used implants over the past 40 years are those manufactured from titanium [<xref ref-type="bibr" rid="CR1">1</xref>], which are still the most popular.</p><p>The recent demands for materials without metal alloys in dentistry, together with the increased sensitivity and allergies of some patients, have promoted the development of new materials.</p><p>An example of this is zirconia-based dental implants, known as zirconia or zirconium oxide implants. Its biocompatibility and its extraordinary mechanical properties make it suitable for numerous situations. Its main advantage lies in its elasticity which is greater than that of titanium and much greater than that of cortical bone. To avoid overload of the underlying bone from the direct transmission of biting impacts, several materials that can absorb part of this excess force have developed.</p><p>One of the prosthetic options lies in the combined use of PEEK restorations with composite coating on zirconia implants due to their physical and mechanical properties and their biocompatibility.</p></sec><sec id="Sec2"><title>Case presentation</title><p>A patient who is a 45-year-old woman and non-smoker has no medical record of interest. The patient complained of pain in the right second upper molar. She said that she felt intense pain while chewing. The pain was accentuated with occlusion and while chewing, making normal functioning impossible. The patient mentioned the absence of piece 16, which had been extracted 8 years previously.</p><p>Clinical examination showed a longitudinal fracture in the palatal root of molar tooth 17, which was confirmed by a radiographic examination (Fig. <xref rid="Fig1" ref-type="fig">1</xref>), which was removed during this appointment. Due to the absence of both molars, the patient expressed a desire to replace them with implants. She also worried about having metal in her mouth and insisted on an alternative material to titanium implants, as well as her intention to replace her molars with metal-free restorations. After 4 months of healing, we proposed as a treatment 2 white SKY (Bredent®) zirconia implants, (4.5 × 10 mm and 4.5 × 8 mm), with PEEK restorations and composite coating. The patient was informed about the intention to publish the results and agreed that the data from this study were public. The patient accepts the treatment and signs informed consent. The CIROM clinical committee has approved the oral surgery for Zirconia and PEEK implantation to the patient.<fig id="Fig1"><label>Fig. 1</label><caption><p>Diagnostic radiographic exploration previous to treatment</p></caption><graphic xlink:href="40729_2016_62_Fig1_HTML" id="MO1"></graphic></fig></p><sec id="Sec3"><title>Initial exam</title><p>The edentulous crest showed an adequate amount of attached gingiva, thick enough to perform a flapless technique using a circular scalpel, [<xref ref-type="bibr" rid="CR2">2</xref>] allowing the integrity of the peri-implant structures to be maintained, while diminishing post-operative pain [<xref ref-type="bibr" rid="CR3">3</xref>].</p></sec><sec id="Sec4"><title>Surgical technique</title><p>For the flapless technique, we made two circular punch incisions in the gums, with a circular scalpel. The mucous plug was withdrawn with a periosteotome while maintaining the integrity of the gum around the incisions. We continued with the drilling indicated by the manufacturer, to insert two white SKY (Bredent®) zirconia implants of 10 mm length × 4.5 mm diameter in positions 17 and 16 (8 mm length × 4 mm diameter) (Fig. <xref rid="Fig2" ref-type="fig">2</xref>).<fig id="Fig2"><label>Fig. 2</label><caption><p>Flapless surgical technique, atraumatic surgical procedure for zirconium implants using the circular scalpel (<bold>a</bold>)–sharp, clean cut without bleeding (<bold>b</bold>)</p></caption><graphic xlink:href="40729_2016_62_Fig2_HTML" id="MO2"></graphic></fig></p></sec><sec id="Sec5"><title>Healing period</title><p>Fifteen days after surgery, the appearance of the soft tissue was excellent, with no signs of inflammation in the mucosa. The patient mentioned the absence of bleeding and pain during the post-operation period. At the same time, we made a clinical and radiological evaluation. Three months after surgery, the stumps of the implants were carved to improve their parallelism with a special diamond drill (Kit Bredent®). Finally, we took impressions for the final restoration with polyether (Impregum, 3 M ESPE) without using retraction threads.</p><p>The final restorations were produced using CAD/CAM System Juvora® for the PEEK structure with composite coating (Anaxdent®). For cementation ionomer glass cement reinforced with resin was used (GC FujiCEM, GC Europe N.V.) (Figs. <xref rid="Fig3" ref-type="fig">3</xref> and <xref rid="Fig4" ref-type="fig">4</xref>).<fig id="Fig3"><label>Fig. 3</label><caption><p>Final restaurations: The parallelism of the implants is achieved by carving the non-submerged part <bold>a</bold> occlusal view and <bold>b</bold> lingual view</p></caption><graphic xlink:href="40729_2016_62_Fig3_HTML" id="MO3"></graphic></fig><fig id="Fig4"><label>Fig. 4</label><caption><p>Follow-up after 1 year, no radiographic sign was appreciating and the osseointegration was satisfactory</p></caption><graphic xlink:href="40729_2016_62_Fig4_HTML" id="MO4"></graphic></fig></p></sec><sec id="Sec6"><title>Tracking</title><p>A clinical and radiographic review carried out a year after the initial surgery showed the complete success of the procedure according to Albrektsson’s criteria and the natural aspect of the soft tissue around the restorations (Fig. <xref rid="Fig5" ref-type="fig">5</xref>).<fig id="Fig5"><label>Fig. 5</label><caption><p>Periapical X ray after 1 year of follow-up, the bone was stable and no sign of peri-implantitis was shown</p></caption><graphic xlink:href="40729_2016_62_Fig5_HTML" id="MO5"></graphic></fig></p></sec><sec id="Sec7"><title>Discussion</title><p>Intraoral conditions (saliva pH, acidic drinks, bacterial plaque, etc.) interact with metals, increasing corrosion, a phenomenon that also affects titanium implants [<xref ref-type="bibr" rid="CR4">4</xref>, <xref ref-type="bibr" rid="CR5">5</xref>]. Amongst other reasons, this is whereby patients increasingly request the use of materials free of metallic alloys. In response to this growing demand, zirconia implants are considered an alternative, due to their low reactivity [<xref ref-type="bibr" rid="CR6">6</xref>].</p><p>In recent years, several implant manufacturers have investigated the behaviour of zirconia implants on hard and soft tissues. The characteristics of their biocompatibility, together with good osseointegration, make them clear candidates for clinical use in dentistry [<xref ref-type="bibr" rid="CR7">7</xref>, <xref ref-type="bibr" rid="CR8">8</xref>]. One of the advantages of these implants is the absence of cracks (gap) between pillar and implant since they are made in a single block. (Bredent®, Straumman®) [<xref ref-type="bibr" rid="CR9">9</xref>, <xref ref-type="bibr" rid="CR10">10</xref>]. However, this feature implies the need to carve the pillars to achieve proper parallelisation.</p><p>Several studies have shown that zirconia implants present a similar healing pattern to titanium implants, both as regards the healing time and marginal bone stability [<xref ref-type="bibr" rid="CR11">11</xref>–<xref ref-type="bibr" rid="CR13">13</xref>]. However, there is a controversy over the long-term stability of the bone-implant interface, which depends on several factors such as surface, composition and design of the implant. Other important factors to consider are the implant-stump-crown connection, as well as the composition of the restorative material and the occlusal load transmitted by the antagonist tooth.</p><p>In terms of the load-cushioning capacity of the prosthetic elements, the use of PEEK as a prosthetic structure on implants has increased in recent years [<xref ref-type="bibr" rid="CR14">14</xref>]. PEEK is a high-density thermoplastic polymer with a linear aromatic semi-crystalline structure that has exceptional physical and chemical properties as regards toughness, hardness and elasticity. Also, its low molecular weight, combined with the absence of metal, allows its use as excellent biocompatible prosthetic denture material.</p><p>PEEK has a modulus of elasticity (E-modulus 4 GPa) great overdenture implants compared to other conventional materials such as titanium (E-module 110 GPa) or zirconium dioxide (E-modulus 210 GPa).</p><p>In addition, the bending resistance of metal-ceramic restorations stands at around 400 to 600 Mpa. [<xref ref-type="bibr" rid="CR15">15</xref>], in contrast to new composite coatings that have a Vickers hardness of approximately 400 MPa and a bending capacity of 314 MPa. Conversely, zirconia is three times harder (1200 HV) and its resistance to bending is 1400 Mpa [<xref ref-type="bibr" rid="CR16">16</xref>].</p><p>As a whole, all of these features mean that the use of materials of high rigidity will result in direct transmission of chewing forces to the zirconia implant. This potential overload could cause bone reabsorption around the implants [<xref ref-type="bibr" rid="CR17">17</xref>]. Some authors claim that this relation only exists in cases accompanied by a previous inflammatory process (of infectious origin), [<xref ref-type="bibr" rid="CR18">18</xref>] where bone loss would be accelerated.</p><p>To avoid exceeding the adaptive limits of the bone and maintain the proper stimulation of mechanical stress that will keep the bone vital [<xref ref-type="bibr" rid="CR19">19</xref>], PEEK components seem a viable alternative to obtaining a similar modulus to that of cortical bone. In this way, bone could be stimulated, favouring remodelling without overload [<xref ref-type="bibr" rid="CR20">20</xref>]. It would concentrate the load by absorbing and distributing the same [<xref ref-type="bibr" rid="CR21">21</xref>]. Its capacity of load absorption has led some authors to recommend its use in patients with severe bruxism [<xref ref-type="bibr" rid="CR22">22</xref>].</p><p>Finite element analysis suggests that maximum contact pressure at the bone-titanium implant interface can be significantly reduced by using a PEEK crown rather than a ceramic crown [<xref ref-type="bibr" rid="CR23">23</xref>].</p><p>In addition to PEEK, new coatings based on PMMA or composite materials (Anaxblent®Anaxdent®, Nexco®Ivoclar®, Solidex®Shofu®, Novo.lign®Bredent®, etc.) which incorporate ceramic fillings have been developed. Due to their molecular structure, these materials have excellent density and homogeneity [<xref ref-type="bibr" rid="CR24">24</xref>]. The micro filling integrated into the polymer matrix increases abrasion resistance, at the same time as providing optimal elasticity which resembles the natural structure of a tooth. Although these restorations show good colour stability and a long-lasting shine, texture and brightness, they differ substantially from ceramic coatings which have excellent optical properties that enable them to achieve better long-term aesthetic results.</p><p>None of the authors have any competing interests in the manuscript. All authors have performed important contribution and have read and approved the final version to be published.</p></sec></sec><sec id="Sec8"><title>Conclusions</title><p>Zirconia implants with PEEK restorations can be considered a good alternative for replacing natural teeth. Their biocompatibility and biostability make them a promising material for those patients who suffer from allergies and sensitivity to metal alloys.</p><p>PEEK restorations are a valid and alternative recommendation when using zirconia implants because of their cushioning effect and elastic modulus, which absorb occlusal forces and wear like a natural tooth, which could optimise and preserve osseointegration with time.</p><p>Within the limitations of this study, we recommend the combined use of zirconia implants, PEEK structures and PMMA coatings in patients with intolerance to or rejection of metal alloys.</p></sec></body><back><ack><sec id="FPar1"><title>Authors’ contributions</title><p>SPA participated in its design and coordination, helped to draft the manuscript and is the corresponding author. PIJM performed the surgery and patient treatment. CMME participated in its design and coordination and helped to draft the manuscript. MJJ participated in its design and coordination and helped to draft the manuscript. All authors read and approved the final manuscript.</p></sec><sec id="FPar2"><title>Competing interests</title><p>The authors Arturo Sánchez-Pérez, José María Parmigiani-Izquierdo, María Eugenia Cabaña-Muñoz, José Joaquín Merino certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements) or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.</p></sec></ack><ref-list id="Bib1"><title>References</title><ref id="CR1"><label>1.</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Brånemark</surname><given-names>PI</given-names></name><name><surname>Hansson</surname><given-names>BO</given-names></name><name><surname>Adell</surname><given-names>R</given-names></name><name><surname>Breine</surname><given-names>U</given-names></name><name><surname>Lindström</surname><given-names>J</given-names></name><name><surname>Hallén</surname><given-names>O</given-names></name><etal></etal></person-group><article-title>Osseointegrated implants in the treatment of the edentulous jaw. 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