Influence of Material Properties on Rate of Resorption of Two Bone Graft Materials after Sinus Lift Using Radiographic Assessment
Identifieur interne : 002D47 ( Pmc/Corpus ); précédent : 002D46; suivant : 002D48Influence of Material Properties on Rate of Resorption of Two Bone Graft Materials after Sinus Lift Using Radiographic Assessment
Auteurs : Fawzi Riachi ; Nada Naaman ; Carine Tabarani ; Nayer Aboelsaad ; Moustafa N. Aboushelib ; Antoine Berberi ; Ziad SalamehSource :
- International Journal of Dentistry [ 1687-8728 ] ; 2012.
Abstract
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DOI: 10.1155/2012/737262
PubMed: 22899930
PubMed Central: 3415107
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Influence of Material Properties on Rate of Resorption of Two Bone Graft Materials after Sinus Lift Using Radiographic Assessment</title><author><name sortKey="Riachi, Fawzi" sort="Riachi, Fawzi" uniqKey="Riachi F" first="Fawzi" last="Riachi">Fawzi Riachi</name><affiliation><nlm:aff id="I1">Department of Oral Surgery, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Naaman, Nada" sort="Naaman, Nada" uniqKey="Naaman N" first="Nada" last="Naaman">Nada Naaman</name><affiliation><nlm:aff id="I2">Department of Periodontology, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Tabarani, Carine" sort="Tabarani, Carine" uniqKey="Tabarani C" first="Carine" last="Tabarani">Carine Tabarani</name><affiliation><nlm:aff id="I1">Department of Oral Surgery, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Aboelsaad, Nayer" sort="Aboelsaad, Nayer" uniqKey="Aboelsaad N" first="Nayer" last="Aboelsaad">Nayer Aboelsaad</name><affiliation><nlm:aff id="I3">Periodontology Department, Faculty of Dentistry, Beirut Arab University, P.O. Box 115020 Rial el Solh, 1107 Beirut, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Aboushelib, Moustafa N" sort="Aboushelib, Moustafa N" uniqKey="Aboushelib M" first="Moustafa N." last="Aboushelib">Moustafa N. Aboushelib</name><affiliation><nlm:aff id="I4">Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt</nlm:aff></affiliation></author><author><name sortKey="Berberi, Antoine" sort="Berberi, Antoine" uniqKey="Berberi A" first="Antoine" last="Berberi">Antoine Berberi</name><affiliation><nlm:aff id="I5">Research Department, School of Dental Medicine, Lebanese University, P.O. Box 4 Hadath, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Salameh, Ziad" sort="Salameh, Ziad" uniqKey="Salameh Z" first="Ziad" last="Salameh">Ziad Salameh</name><affiliation><nlm:aff id="I5">Research Department, School of Dental Medicine, Lebanese University, P.O. Box 4 Hadath, Lebanon</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">22899930</idno><idno type="pmc">3415107</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3415107</idno><idno type="RBID">PMC:3415107</idno><idno type="doi">10.1155/2012/737262</idno><date when="2012">2012</date><idno type="wicri:Area/Pmc/Corpus">002D47</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">002D47</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Influence of Material Properties on Rate of Resorption of Two Bone Graft Materials after Sinus Lift Using Radiographic Assessment</title><author><name sortKey="Riachi, Fawzi" sort="Riachi, Fawzi" uniqKey="Riachi F" first="Fawzi" last="Riachi">Fawzi Riachi</name><affiliation><nlm:aff id="I1">Department of Oral Surgery, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Naaman, Nada" sort="Naaman, Nada" uniqKey="Naaman N" first="Nada" last="Naaman">Nada Naaman</name><affiliation><nlm:aff id="I2">Department of Periodontology, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Tabarani, Carine" sort="Tabarani, Carine" uniqKey="Tabarani C" first="Carine" last="Tabarani">Carine Tabarani</name><affiliation><nlm:aff id="I1">Department of Oral Surgery, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Aboelsaad, Nayer" sort="Aboelsaad, Nayer" uniqKey="Aboelsaad N" first="Nayer" last="Aboelsaad">Nayer Aboelsaad</name><affiliation><nlm:aff id="I3">Periodontology Department, Faculty of Dentistry, Beirut Arab University, P.O. Box 115020 Rial el Solh, 1107 Beirut, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Aboushelib, Moustafa N" sort="Aboushelib, Moustafa N" uniqKey="Aboushelib M" first="Moustafa N." last="Aboushelib">Moustafa N. Aboushelib</name><affiliation><nlm:aff id="I4">Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt</nlm:aff></affiliation></author><author><name sortKey="Berberi, Antoine" sort="Berberi, Antoine" uniqKey="Berberi A" first="Antoine" last="Berberi">Antoine Berberi</name><affiliation><nlm:aff id="I5">Research Department, School of Dental Medicine, Lebanese University, P.O. Box 4 Hadath, Lebanon</nlm:aff></affiliation></author><author><name sortKey="Salameh, Ziad" sort="Salameh, Ziad" uniqKey="Salameh Z" first="Ziad" last="Salameh">Ziad Salameh</name><affiliation><nlm:aff id="I5">Research Department, School of Dental Medicine, Lebanese University, P.O. Box 4 Hadath, Lebanon</nlm:aff></affiliation></author></analytic><series><title level="j">International Journal of Dentistry</title><idno type="ISSN">1687-8728</idno><idno type="eISSN">1687-8736</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p><italic>Purpose</italic>. The aim of this study was to investigate the influence of chemical and physical properties of two graft materials on the rate of resorption. <italic>Materials and Methods</italic>. Direct sinus graft procedure was performed on 22 patients intended for implant placement. Two types of graft materials were used (Bio-Oss and Cerabone) and after 8 months healing time the implants were inserted. Radiographic assessment was performed over the period of four years. Particle size, rate of calcium release, and size and type of crystal structure of each graft were evaluated. <italic>Results.</italic> The average particle size of Bio-Oss (1 mm) was much smaller compared to Cerabone (2.7 mm). The amount of calcium release due to dissolution of material in water was much higher for Bio-oss compared to Cerabone. X-ray image analysis revealed that Bio-Oss demonstrated significantly higher volumetric loss (33.4 ± 3.1%) of initial graft size compared to Cerabone (23.4 ± 3.6%). The greatest amount of vertical loss of graft material volume was observed after one year of surgery. <italic>Conclusion</italic>. The chemical and physical properties of bone graft material significantly influence resorption rate of bone graft materials used for sinus augmentation.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Aguirre Zorzano, La" uniqKey="Aguirre Zorzano L">LA Aguirre Zorzano</name></author><author><name sortKey="Rodriguez Tojo, Mj" uniqKey="Rodriguez Tojo M">MJ Rodríguez Tojo</name></author><author><name sortKey="Aguirre Urizar, Jm" uniqKey="Aguirre Urizar J">JM Aguirre Urizar</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Boyne, Pj" uniqKey="Boyne P">PJ Boyne</name></author><author><name sortKey="James, Ra" uniqKey="James R">RA James</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Tatum, H" uniqKey="Tatum H">H Tatum</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Misch, Ce" uniqKey="Misch C">CE Misch</name></author><author><name 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Int J Dent</journal-id><journal-id journal-id-type="iso-abbrev">Int J Dent</journal-id><journal-id journal-id-type="publisher-id">IJD</journal-id><journal-title-group><journal-title>International Journal of Dentistry</journal-title></journal-title-group><issn pub-type="ppub">1687-8728</issn><issn pub-type="epub">1687-8736</issn><publisher><publisher-name>Hindawi Publishing Corporation</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">22899930</article-id><article-id pub-id-type="pmc">3415107</article-id><article-id pub-id-type="doi">10.1155/2012/737262</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>Influence of Material Properties on Rate of Resorption of Two Bone Graft Materials after Sinus Lift Using Radiographic Assessment</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Riachi</surname><given-names>Fawzi</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Naaman</surname><given-names>Nada</given-names></name><xref ref-type="aff" rid="I2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Tabarani</surname><given-names>Carine</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Aboelsaad</surname><given-names>Nayer</given-names></name><xref ref-type="aff" rid="I3"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Aboushelib</surname><given-names>Moustafa N.</given-names></name><xref ref-type="aff" rid="I4"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Berberi</surname><given-names>Antoine</given-names></name><xref ref-type="aff" rid="I5"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Salameh</surname><given-names>Ziad</given-names></name><xref ref-type="aff" rid="I5"><sup>5</sup></xref><xref ref-type="corresp" rid="cor1">*</xref></contrib></contrib-group><aff id="I1"><sup>1</sup>Department of Oral Surgery, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</aff><aff id="I2"><sup>2</sup>Department of Periodontology, Faculty of Dental Medicine, Saint Joseph University, P.O. Box 17-5208, Beirut 1104-2020, Lebanon</aff><aff id="I3"><sup>3</sup>Periodontology Department, Faculty of Dentistry, Beirut Arab University, P.O. Box 115020 Rial el Solh, 1107 Beirut, Lebanon</aff><aff id="I4"><sup>4</sup>Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt</aff><aff id="I5"><sup>5</sup>Research Department, School of Dental Medicine, Lebanese University, P.O. Box 4 Hadath, Lebanon</aff><author-notes><corresp id="cor1">*Ziad Salameh: <email>drzsalameh@gmail.com</email></corresp><fn fn-type="other"><p>Academic Editor: Silvio Taschieri</p></fn></author-notes><pub-date pub-type="ppub"><year>2012</year></pub-date><pub-date pub-type="epub"><day>31</day><month>7</month><year>2012</year></pub-date><volume>2012</volume><elocation-id>737262</elocation-id><history><date date-type="received"><day>25</day><month>5</month><year>2012</year></date><date date-type="accepted"><day>24</day><month>6</month><year>2012</year></date></history><permissions><copyright-statement>Copyright © 2012 Fawzi Riachi et al.</copyright-statement><copyright-year>2012</copyright-year><license xlink:href="https://creativecommons.org/licenses/by/3.0/"><license-p>This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p><italic>Purpose</italic>. The aim of this study was to investigate the influence of chemical and physical properties of two graft materials on the rate of resorption. <italic>Materials and Methods</italic>. Direct sinus graft procedure was performed on 22 patients intended for implant placement. Two types of graft materials were used (Bio-Oss and Cerabone) and after 8 months healing time the implants were inserted. Radiographic assessment was performed over the period of four years. Particle size, rate of calcium release, and size and type of crystal structure of each graft were evaluated. <italic>Results.</italic> The average particle size of Bio-Oss (1 mm) was much smaller compared to Cerabone (2.7 mm). The amount of calcium release due to dissolution of material in water was much higher for Bio-oss compared to Cerabone. X-ray image analysis revealed that Bio-Oss demonstrated significantly higher volumetric loss (33.4 ± 3.1%) of initial graft size compared to Cerabone (23.4 ± 3.6%). The greatest amount of vertical loss of graft material volume was observed after one year of surgery. <italic>Conclusion</italic>. The chemical and physical properties of bone graft material significantly influence resorption rate of bone graft materials used for sinus augmentation.</p></abstract></article-meta></front><body><sec id="sec1"><title>1. Introduction</title><p>Maxillary sinus augmentation and placement of dental implants is a well-established technique for functional and esthetic rehabilitation of partially or completely edentulous patients with severe maxillary atrophy. Sinus pneumatization, together with poor bone quality, is one of the most challenging circumstances in implantology, a condition that will restrict implant placement in such areas. When this situation occurs, bone grafts can be used to correct bone deficits, allowing the placement of implants of adequate length and width [<xref rid="B1" ref-type="bibr">1</xref>]. The first report about maxillary sinus floor augmentation for placement of implants was published by Boyne and James [<xref rid="B2" ref-type="bibr">2</xref>], while Tatum [<xref rid="B3" ref-type="bibr">3</xref>] first described two techniques with a sinus approach from the alveolar crest and lateral wall in maxillary and sinus implant reconstruction.</p><p>There are diverse choices of graft materials available for replacing lost bone through atrophy, trauma, congenital or pathological processes. These graft materials include: intra or extraoral autologous bone, heterologous grafts, alloplastic grafts, xenografts or a combination of these [<xref rid="B4" ref-type="bibr">4</xref>]. In general, the success of a bone graft is measured in terms of its capacity to withstand the conditions of tension and mechanical deformation to which it is subjected. The interactions between graft material and healing processes at the host site have a direct influence on the pattern, rate, and quality of new bone formation. Successful grafts are those that undergo revascularization and substitution of the graft material by host bone, without suffering a significant loss of mechanical strength or graft volume [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B6" ref-type="bibr">6</xref>].</p><p>Clinical and histomorphometric studies done on autografts, bovine hydroxyapatite (Bio-Oss, Geistlich), a xenograft and <italic>β</italic>-tricalciumphosphate (Cerasorb, Curasan), an alloplast, prove that all these grafting materials are biocompatible, osseoconductive and can be used successfully in conjunction during implant rehabilitation [<xref rid="B7" ref-type="bibr">7</xref>, <xref rid="B8" ref-type="bibr">8</xref>]. However, rate of resorption of these materials is dependent on their chemical and physical properties. Frenken et al. [<xref rid="B9" ref-type="bibr">9</xref>] evaluated the quantity and quality of bone formed in sinus augmentations using a synthetic material: biphasic calcium phosphate consisting of a combination of 60% hydroxyapatite and 40% <italic>β</italic>-tricalcium phosphate. Histological findings reported differences in the amount of newly formed bone used with each material.</p><p> The aim of this study was to evaluate the influence of chemical and physical properties of two types of bone graft materials on the rate of resorption after placement in sinus lift procedure over a period of four years.</p></sec><sec id="sec2"><title>2. Materials and Methods</title><p> This study was conducted in coherence with the Helsinki agreement for research on humans and the study design was approved by the Institutional Review Board and Independent Ethics Committee of the Faculty of Dental Medicine, Saint Joseph University, Beirut, Lebanon. Signed informed consent forms were obtained for all participants in the study.</p><p> Two xenograft materials prepared by deproteinizing technique (Bio-Oss, Geistlich Sons Ltd., Wolhusen, Switzerland) or high temperature decalcified freeze-dried (Cerabone, Botiss Dental, Berlin, Germany) were selected for this study.</p><sec id="sec2.1"><title>2.1. Characterization of the Graft Materials</title><p>The particle size of each graft material was calculated using particle size analyzer (Partica LA-950V2, Horiba Scientific, Kyoto, Japan), and average particle size and distribution were calculated from 5 different batches for each material.</p><p>Crystal structure and size of crystals were calculated using X-ray diffraction (XRD) technique. 5 gram of each material was finely ground, dried, and homogenously dispersed on the measuring table of the machine (Bruker AXS, D8 Advance, Bruker AXS GmbH, Karlsruhe, Germany, 10°/min, 2<italic><italic>θ</italic></italic> from 5° to 60°). The phase composition was checked using Joint Committee on Powder Diffraction standards. Crystallite size analysis was calculated using the peak broadening of XRD reflection that is used to estimate the crystallite size (in a direction perpendicular to the crystallographic plane) using the following formula:
<disp-formula><label>(1)</label><mml:math id="M1"><mml:mtable><mml:mtr><mml:mtd><mml:mlabeledtr id="eq1"><mml:mtd></mml:mtd><mml:mtd><mml:mrow><mml:maligngroup></mml:maligngroup><mml:mtable><mml:mtr><mml:mtd><mml:mrow><mml:maligngroup></mml:maligngroup><mml:mi>X</mml:mi><mml:mi>s</mml:mi><mml:mo>=</mml:mo></mml:mrow></mml:mtd></mml:mtr></mml:mtable><mml:mfrac><mml:mrow><mml:mn mathvariant="normal">0.9</mml:mn><mml:mi>λ</mml:mi></mml:mrow><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>FWHM</mml:mtext><mml:mo>×</mml:mo><mml:mi>cos</mml:mi><mml:mo></mml:mo><mml:mi>θ</mml:mi></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:mfrac><mml:mo>,</mml:mo></mml:mrow></mml:mtd></mml:mlabeledtr></mml:mtd></mml:mtr></mml:mtable></mml:math></disp-formula>where <italic>Xs</italic> is the crystallite size in nanometer, <italic>λ</italic> is the wavelength of X-ray beam in nanometer (<italic>λ</italic> = 0.15406 nm for standard detectors), and FWHM is the full width at half maximum for the diffraction angle (2<italic>θ</italic> = 25.9° peak was selected related to (002) Miller's plane family).</p><p> Solubility of graft material in demineralized water was evaluated using atomic absorption spectrophotometer (WFX-210, RayLeigh, BRAIC, China). Calcium and phosphorous detectors were calibrated in standard solution before each reading. 0.25 gram of each material was immersed in 100 mL of double purified water and the amount of calcium dissolution was measured every week for a period of six months.</p><p>Patients received detailed explanations of the difficulties and complications that could take place during the surgery and all patients agreed before the surgery. All of the 22 consenting patients were examined and medically compromised and uncooperative cases were excluded from the study.</p></sec><sec id="sec2.2"><title>2.2. Sinus Lift Technique</title><p>Local anesthesia was administered (2% lidocaine containing 1 : 100,000 epinephrine) and a horizontal incision was made along on the crestal bone in the edentulous area and then vertical incisions were made to elevate the mucoperiosteal flap. After elevation of a full-thickness mucoperiosteal flap, access was gained to the anterior bony wall of the sinus. The lateral bony wall of the sinus was cut by using a small diamond bur. All the cortical bone was removed up to the sinus membrane. After elevation of the membrane, the sinus cavity was then packed with either of the selected materials Figures <xref ref-type="fig" rid="fig1">1(a)</xref>, <xref ref-type="fig" rid="fig1">1(b)</xref>, and <xref ref-type="fig" rid="fig1">1(c)</xref>. An absorbable collagen membrane (Bio-Gide, Geistlich Pharma AG, Wolhusen, Switzerland) was then placed on the graft to avoid migration of the graft and invasion of soft tissues. After the surgery, patients were prescribed 625 mg of antibiotic (Augmentin, GlaxoSmithKline, United Kingdom) twice a day for a week and advised to rinse their mouths daily with Chlorhexidine Gluconate Oral Rinse 0.12% (PerioGard, Colgate-Palmolive, United Kingdom) during healing period. The patients were examined 1 week after surgery when the sutures were removed. All patients were checked regularly to verify healing. After a healing period of 8 months, all implants (NobelReplace, Nobel Biocare, Kloten, Switzerland) were placed by one expert oral surgeon. The choice of the implant length was based on the postpanoramic X-rays after the sinus lift surgery.</p></sec><sec id="sec2.3"><title>2.3. Measurement of Graft Height</title><p>Height of graft material was measured at the following intervals:<list list-type="roman-lower"><list-item><p>1st measurement: right after the implantation (baseline),</p></list-item><list-item><p>2nd measurement: after 8 month at time of implant placement,</p></list-item><list-item><p>3rd measurement: one year after implant placement,</p></list-item><list-item><p>4th measurement: four years after implant placement.</p></list-item></list>The implant length, alveolar crest, the original base line of the sinus floor, and the final graft height were traced by superimposition of the panoramic images. Two fixed measurement points were evaluated using image analysis software (Cell A, Olympus, Germany) to the accuracy of 1 um. [<xref rid="B10" ref-type="bibr">10</xref>]. Implant length was used to correct for any magnification errors.</p></sec><sec id="sec2.4"><title>2.4. Statistical Analysis</title><p>Data were analyzed using computer statistical program software (SPSS 18.0, SPSS Inc, Chicago, Il, USA) to evaluate the resorption rate of graft material with time and the differences between graft materials (means and standard deviations). Changes in graft volume at different time intervals were analyzed using Student's <italic>t</italic>-test (<italic>α</italic> = 0.05).</p></sec></sec><sec id="sec3"><title>3. Results</title><p>The average particle size of Bio-Oss (1 mm) was much smaller compared to Cerabone (2.7 mm), Figures <xref ref-type="fig" rid="fig2">2(a)</xref> and <xref ref-type="fig" rid="fig2">2(b)</xref>. X-ray diffraction analysis revealed typical structure of hydroxylapatite for both materials. The crystallite size was smaller for Bio-Oss (41.7 nm at 25.86 diffraction angle) compared to Cerabone (53.2 nm at 25.95 diffraction angle), <xref ref-type="fig" rid="fig3">Figure 3</xref>.</p><p>The amount of calcium release due to dissolution of the material in water was much higher for Bio-Oss compared to Cerabone. This observation was marked in the first 6 weeks after which dissolution rate of calcium ions reaches a fixed rate for both materials, <xref ref-type="fig" rid="fig4">Figure 4</xref>.</p><p>Four implants failed after 6 months from insertion time due to lack of adequate initial stability, these cases were replaced with new cases. All patients demonstrated adequate healing after grafting surgery without complications. X-ray image analysis revealed that Bio-Oss demonstrated significantly higher (<italic>t</italic> = 7.25, <italic>P</italic> < 0.001) volumetric loss (33.4 ± 3.1%, volumetric loss of total graft height after 4 years) compared to Cerabone (23.4 ± 3.6%). The greatest amount of vertical loss of graft volume was observed after one year of graft surgery (55–65% of total bone loss), which decreased almost to 10–12% per year later on for both materials (<italic>P</italic> < 0.06), Figures <xref ref-type="fig" rid="fig5">5</xref> and <xref ref-type="fig" rid="fig6">6</xref>. After four years from implant placement, it was observed that the height of Bio-Oss bone graft was located at level of implant apex while this finding was not reported for Cerabone.</p></sec><sec id="sec4"><title>4. Discussion</title><p> Numerous allogenic or alloplastic materials have been used alone or in combination with autogenous bone for sinus augmentation. Many researchers showed that these materials could be as effective as autologous bone [<xref rid="B11" ref-type="bibr">11</xref>–<xref rid="B19" ref-type="bibr">19</xref>]. Histologic evidence generated by studies of mature grafts and the excellent survival rates of implants inserted in them have led to the realization that these nonautogenous graft materials may be considered an excellent option [<xref rid="B9" ref-type="bibr">9</xref>, <xref rid="B13" ref-type="bibr">13</xref>, <xref rid="B15" ref-type="bibr">15</xref>, <xref rid="B20" ref-type="bibr">20</xref>–<xref rid="B23" ref-type="bibr">23</xref>].</p><p>Moy et al. [<xref rid="B25" ref-type="bibr">24</xref>] reported 59.4 ± 18.0% new bone formation and 40.5 ± 17.9% connective tissue in the histomorphometric analysis of sinus augmented with chin bone after six-month healing time, The quality of newly formed bone was superior when compared to bovine hydroxyapatite and <italic>β</italic>-tricalciumphosphate, as it was composed of about 80% lamellar mature in nature. Another histomorphometric study [<xref rid="B26" ref-type="bibr">25</xref>] using Bio-Oss showed 28% mature bone, 44% connective tissue, and 28% bovine hydroxyapatite (BHA) particles in a period of 6 months from 20 sinus lifts done in 15 patients.</p><p>A ten-year follow-up study [<xref rid="B27" ref-type="bibr">26</xref>] from 36 sinus grafts reported 29.8 ± 2.5% new bone formation in the first 8 months, 69.7 ± 2.6% in the next one year, and by the end of the study it was 86.7 ± 2.84%. The study proved that the rate of resorption of the graft material, BHA, was 3.55% per month in the initial 2 years and then the value reached a mean value of 0.58% per month in the next 8 years that is close to the findings of the present study. A total volume loss after 4 years was 34% for Bio-Oss and 22% for Cerabone accounting for an average monthly volume loss of 0.69% for Bio-Oss and 0.5% per month for Cerabone.</p><p>Although BHA is considered to be a resorbable material, it is not clear from the literature if the graft particles will undergo resorption and will eventually be replaced with autogenous bone. Moreover the bone found in conjunction with the BHA particles was mainly woven [<xref rid="B28" ref-type="bibr">27</xref>]. Based on the data observed in the present study, Bio-Oss has smaller particle size (1 mm average particle size compared to 2.7 mm for Cerabone) resulting in significantly higher surface area, higher calcium release rate (9.8 mg/g), and smaller crystallite size (41.7 nm at 25.86 diffraction angle) compared to 53.2 nm at 25.95 diffraction angle for Cerabone. These minor differences were associated with significantly higher resorption rate of the initial graft volume observed for Bio-Oss material.</p><p>Studies [<xref rid="B29" ref-type="bibr">28</xref>, <xref rid="B30" ref-type="bibr">29</xref>] using <italic>β</italic>-tricalciumphosphate (<italic>β</italic>-TCP) in sinus augmentation show around 29% new bone formation after 6 months healing time. When an osseoinductive factor like platelet rich plasma (PRP) was mixed with <italic>β</italic>-TCP, the osseous regenerating capacity was increased to 38%. Nevertheless, a resorption rate of 32–43% was reported; type and quality of crystal content of graft material is a dominant factor-controlling rate of resorption.</p><p> A very recent study [<xref rid="B31" ref-type="bibr">30</xref>] performed an ultrastructural study on bone-to-biomaterial interface and biomaterial mineral degradation in retrieved bone biopsies following maxillary sinus augmentation using bovine xenografts (Endobon). Scanning electron microscopy revealed that newly formed bone was closely attached to the xenograft. Elemental analysis showed a significantly high Ca/P ratio in the residual biomaterials (3.031 ± 0.104) compared with the interface (2.908 ± 0.115) and new bone (2.889 ± 0.113), which suggests that there may be a gradual diffusion of Ca ions from the biomaterial into the newly forming bone at the interface as part of the biomaterial's resorption process. These findings are in direct agreement with the calcium release rate observed in the present study. Under the influence of body fluids and with consideration to flaw dynamics of blood, a higher calcium release rate is expected inside the sinus due to washing-off effect of the released ions, <xref ref-type="fig" rid="fig4">Figure 4</xref>.</p><p> Jensen et al. [<xref rid="B32" ref-type="bibr">31</xref>] reported that the types of graft materials influence the resorption rate of bone which was 1.8 mm in an autograft, 2.1 mm in a demineralized allograft, 0.9 mm in an alloplast, and 0.8 mm in an autograft mixed with alloplast. Histologic reviews of sinus lift procedures [<xref rid="B33" ref-type="bibr">32</xref>] with different types of graft material reported height reduction with all graft materials. Furthermore, in 90% of cases, the graft materials were positioned superior to the apex of the implant, which is in agreement with the findings of this study. The cases grafted with Bio-Oss ended with graft resorption ending at apex of integrated implants after four-year service time, meanwhile at least 3 mm of new bone remained on top of implants inserted in Cerabone graft. Hatano et al. [<xref rid="B10" ref-type="bibr">10</xref>] reported that graft materials were reduced with a statistically significant amount during 2 to 3 years after a sinus lift, while other study [<xref rid="B34" ref-type="bibr">33</xref>] observed that the force loading on dental implants caused graft height to be sustained at a consistent level.</p><p>These results should be interpreted cautiously considering the study's reduced sample size. Further in vitro and in vivo studies should be conducted to validate the results of the present study.</p></sec><sec id="sec5"><title>5. 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Release rate was almost constant after 2 months.</p></caption><graphic xlink:href="IJD2012-737262.004"></graphic></fig><fig id="fig5" orientation="portrait" position="float"><label>Figure 5</label><caption><p>Panoramic X-ray with fixed measuring points at base line (a), after grafting procedure using Bio-Oss after 8-month healing time (b), and after four years of implant placement (c).</p></caption><graphic xlink:href="IJD2012-737262.005"></graphic></fig><fig id="fig6" orientation="portrait" position="float"><label>Figure 6</label><caption><p>Panoramic X-ray with fixed measuring points at base line (a), after grafting procedure using Cerabone (b), and four years of implant placement (c).</p></caption><graphic xlink:href="IJD2012-737262.006"></graphic></fig></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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