Determination of orthodontic tooth movement and tissue reaction following demineralized freeze-dried bone allograft grafting intervention
Identifieur interne : 002B58 ( Pmc/Corpus ); précédent : 002B57; suivant : 002B59Determination of orthodontic tooth movement and tissue reaction following demineralized freeze-dried bone allograft grafting intervention
Auteurs : Massoud Seifi ; Seyed Ahmad GhoraishianSource :
- Dental Research Journal [ 1735-3327 ] ; 2012.
Abstract
Socket preservation after tooth extraction is one of the indications of bone grafting to enhance preorthodontic condition. The aim of this study is to determine the effects of socket preservation on the immediate tooth movement, alveolar ridge height preservation and orthodontic root resorption.
In a split-mouth technique, twelve sites in three dogs were investigated as an experimental study. Crushed demineralized freeze-dried bone allograft (DFDBA) (CenoBone®) was used as the graft material. The defects were made by the extraction of 3rd premolar. On one side of each jaw, the defects were preserved by DFDBA and defects of the other side left opened as the control group. Simultaneously the teeth adjacent to the defects were pulled together by a NiTi coil spring. After eight weeks, the amount of (OTM), alveolar height, and root resorption were measured. Analysis of variance was used for purpose of comparison.
There was a slight increase in OTM at grafted sites as they were compared to the control sites (
Using socket preservation, tooth movement can be immediately started without waiting for the healing of the recipient site. This can provide some advantages like enhanced rate of OTM, its approved effects on ridge preservation that reduces the chance of dehiscence and the reduction of root resorption.
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PubMed: 22623939
PubMed Central: 3353699
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PMC:3353699Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Determination of orthodontic tooth movement and tissue reaction following demineralized freeze-dried bone allograft grafting intervention</title>
<author><name sortKey="Seifi, Massoud" sort="Seifi, Massoud" uniqKey="Seifi M" first="Massoud" last="Seifi">Massoud Seifi</name>
<affiliation><nlm:aff id="aff1">Department of Orthodontic Center for Dental Research, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ghoraishian, Seyed Ahmad" sort="Ghoraishian, Seyed Ahmad" uniqKey="Ghoraishian S" first="Seyed Ahmad" last="Ghoraishian">Seyed Ahmad Ghoraishian</name>
<affiliation><nlm:aff id="aff2">Dentofacial Deformities Research Center, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff>
</affiliation>
</author>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Determination of orthodontic tooth movement and tissue reaction following demineralized freeze-dried bone allograft grafting intervention</title>
<author><name sortKey="Seifi, Massoud" sort="Seifi, Massoud" uniqKey="Seifi M" first="Massoud" last="Seifi">Massoud Seifi</name>
<affiliation><nlm:aff id="aff1">Department of Orthodontic Center for Dental Research, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ghoraishian, Seyed Ahmad" sort="Ghoraishian, Seyed Ahmad" uniqKey="Ghoraishian S" first="Seyed Ahmad" last="Ghoraishian">Seyed Ahmad Ghoraishian</name>
<affiliation><nlm:aff id="aff2">Dentofacial Deformities Research Center, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Dental Research Journal</title>
<idno type="ISSN">1735-3327</idno>
<idno type="eISSN">2008-0255</idno>
<imprint><date when="2012">2012</date>
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<front><div type="abstract" xml:lang="en"><sec id="st1"><title>Background:</title>
<p>Socket preservation after tooth extraction is one of the indications of bone grafting to enhance preorthodontic condition. The aim of this study is to determine the effects of socket preservation on the immediate tooth movement, alveolar ridge height preservation and orthodontic root resorption.</p>
</sec>
<sec id="st2"><title>Materials and Methods:</title>
<p>In a split-mouth technique, twelve sites in three dogs were investigated as an experimental study. Crushed demineralized freeze-dried bone allograft (DFDBA) (CenoBone<sup>®</sup>
) was used as the graft material. The defects were made by the extraction of 3<sup>rd</sup>
premolar. On one side of each jaw, the defects were preserved by DFDBA and defects of the other side left opened as the control group. Simultaneously the teeth adjacent to the defects were pulled together by a NiTi coil spring. After eight weeks, the amount of (OTM), alveolar height, and root resorption were measured. Analysis of variance was used for purpose of comparison.</p>
</sec>
<sec id="st3"><title>Results:</title>
<p>There was a slight increase in OTM at grafted sites as they were compared to the control sites (<italic>P</italic>
<0.05). Also a significant bone resorption in control site and successful socket preservation in experimental site were observed. Reduction of root resorption at the augmented site was significant compared to the normal healing site (<italic>P</italic>
<0.05).</p>
</sec>
<sec id="st4"><title>Conclusion:</title>
<p>Using socket preservation, tooth movement can be immediately started without waiting for the healing of the recipient site. This can provide some advantages like enhanced rate of OTM, its approved effects on ridge preservation that reduces the chance of dehiscence and the reduction of root resorption.</p>
</sec>
</div>
</front>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Dent Res J (Isfahan)</journal-id>
<journal-id journal-id-type="iso-abbrev">Dent Res J (Isfahan)</journal-id>
<journal-id journal-id-type="publisher-id">DRJ</journal-id>
<journal-title-group><journal-title>Dental Research Journal</journal-title>
</journal-title-group>
<issn pub-type="ppub">1735-3327</issn>
<issn pub-type="epub">2008-0255</issn>
<publisher><publisher-name>Medknow Publications & Media Pvt Ltd</publisher-name>
<publisher-loc>India</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">22623939</article-id>
<article-id pub-id-type="pmc">3353699</article-id>
<article-id pub-id-type="publisher-id">DRJ-9-203</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Determination of orthodontic tooth movement and tissue reaction following demineralized freeze-dried bone allograft grafting intervention</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Seifi</surname>
<given-names>Massoud</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Ghoraishian</surname>
<given-names>Seyed Ahmad</given-names>
</name>
<xref ref-type="aff" rid="aff2">2</xref>
<xref ref-type="corresp" rid="cor1"></xref>
</contrib>
</contrib-group>
<aff id="aff1"><label>1</label>
Department of Orthodontic Center for Dental Research, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</aff>
<aff id="aff2"><label>2</label>
Dentofacial Deformities Research Center, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</aff>
<author-notes><corresp id="cor1"><bold>Address for correspondence:</bold>
Dr. Seyed Ahmad Ghoraishian, Dentofacial Deformities Research Center, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. E-mail: <email xlink:href="ahmadg3@yahoo.com">ahmadg3@yahoo.com</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub"><season>Mar-Apr</season>
<year>2012</year>
</pub-date>
<volume>9</volume>
<issue>2</issue>
<fpage>203</fpage>
<lpage>208</lpage>
<history><date date-type="received"><month>6</month>
<year>2011</year>
</date>
<date date-type="accepted"><month>8</month>
<year>2011</year>
</date>
</history>
<permissions><copyright-statement>Copyright: © Dental Research Journal</copyright-statement>
<copyright-year>2012</copyright-year>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract><sec id="st1"><title>Background:</title>
<p>Socket preservation after tooth extraction is one of the indications of bone grafting to enhance preorthodontic condition. The aim of this study is to determine the effects of socket preservation on the immediate tooth movement, alveolar ridge height preservation and orthodontic root resorption.</p>
</sec>
<sec id="st2"><title>Materials and Methods:</title>
<p>In a split-mouth technique, twelve sites in three dogs were investigated as an experimental study. Crushed demineralized freeze-dried bone allograft (DFDBA) (CenoBone<sup>®</sup>
) was used as the graft material. The defects were made by the extraction of 3<sup>rd</sup>
premolar. On one side of each jaw, the defects were preserved by DFDBA and defects of the other side left opened as the control group. Simultaneously the teeth adjacent to the defects were pulled together by a NiTi coil spring. After eight weeks, the amount of (OTM), alveolar height, and root resorption were measured. Analysis of variance was used for purpose of comparison.</p>
</sec>
<sec id="st3"><title>Results:</title>
<p>There was a slight increase in OTM at grafted sites as they were compared to the control sites (<italic>P</italic>
<0.05). Also a significant bone resorption in control site and successful socket preservation in experimental site were observed. Reduction of root resorption at the augmented site was significant compared to the normal healing site (<italic>P</italic>
<0.05).</p>
</sec>
<sec id="st4"><title>Conclusion:</title>
<p>Using socket preservation, tooth movement can be immediately started without waiting for the healing of the recipient site. This can provide some advantages like enhanced rate of OTM, its approved effects on ridge preservation that reduces the chance of dehiscence and the reduction of root resorption.</p>
</sec>
</abstract>
<kwd-group><kwd>Demineralized freeze-dried bone allograft</kwd>
<kwd>orthodontic tooth movement</kwd>
<kwd>root resorption</kwd>
<kwd>socket preservation</kwd>
</kwd-group>
</article-meta>
</front>
<body><sec id="sec1-1"><title>INTRODUCTION</title>
<p>Bone graft is a tissue or material used to repair a defect or deficiency in contour and volume. Bone grafts sources consist of autogenous bone grafting, alloplast substances, xenogenic bone substance, and tissue engineered osteogenic material[<xref ref-type="bibr" rid="ref1">1</xref>
] like osteoinductive agents.[<xref ref-type="bibr" rid="ref2">2</xref>
<xref ref-type="bibr" rid="ref3">3</xref>
] The most popular sources of graft in maxillofacial grafts are autografts, but its limited availability, increased cost, size mismatch and the need for second surgery in donor site shifted surgeons using other grafting materials whenever possible.</p>
<p>The use of demineralized freeze-dried bone allograft (DFDBA) has been the focus of much attention since Senn used demineralized bone for the first time.[<xref ref-type="bibr" rid="ref4">4</xref>
] But controversy on osteoinductive potential of DFDBA began to emerge with more research.[<xref ref-type="bibr" rid="ref5">5</xref>
–<xref ref-type="bibr" rid="ref10">10</xref>
] The controversy may be because of differences in osteoinductivity potential of commercially available DFDBA, this could be traced as[<xref ref-type="bibr" rid="ref11">11</xref>
] concentration of growth factors, demineralization procedures, age of donor and recipient, storage and sterilization procedures, dietary factors and size of pieces. Reynold <italic>et al</italic>
. showed lower osteoinduction in DFDBA compared to freezed dried bone allograft (FDBA) and suggest that the releasing of bone morphogenetic proteins (BMPs) through demineralization procedures leads to this difference[<xref ref-type="bibr" rid="ref11">11</xref>
] DFDBA has been made in different shapes[<xref ref-type="bibr" rid="ref12">12</xref>
–<xref ref-type="bibr" rid="ref14">14</xref>
] such as chips, powder, crushed, etc. By decreasing the size of the pieces, handling and osteoinductive potential improves.[<xref ref-type="bibr" rid="ref15">15</xref>
<xref ref-type="bibr" rid="ref16">16</xref>
]</p>
<p>There are many indications of bone graft to enhance preorthodontic condition. One of them is socket preservation after tooth extractions. Tooth extraction may be needed as a result of caries, traumas, periodontal diseases or space needed for orthodontic treatments. These extractions result in resorptive remodeling of alveolar ridge[<xref ref-type="bibr" rid="ref17">17</xref>
<xref ref-type="bibr" rid="ref18">18</xref>
] especially in buccal aspect.[<xref ref-type="bibr" rid="ref19">19</xref>
] Alveolar bone volume and favorable architecture of the alveolar ridge is needed to avoid fenestration or dehiscence through orthodontic tooth movement (OTM).[<xref ref-type="bibr" rid="ref20">20</xref>
] Today this can be achieved by less traumatic extraction techniques and socket augmentation by graft materials.[<xref ref-type="bibr" rid="ref21">21</xref>
–<xref ref-type="bibr" rid="ref24">24</xref>
<xref ref-type="bibr" rid="ref10">10</xref>
] More important is buccal plate defects because they will not heal completely without use of grafting techniques.[<xref ref-type="bibr" rid="ref25">25</xref>
–<xref ref-type="bibr" rid="ref27">27</xref>
] Lasella <italic>et al</italic>
. suggested that DFDBA with a collagen membrane can reduce the atrophy after tooth extractions.[<xref ref-type="bibr" rid="ref23">23</xref>
] Preorthodontic bone grafting also has the advantage of easier and less detrimental tooth movement through primary woven bone, and inhibition of gingival invagination formations.[<xref ref-type="bibr" rid="ref20">20</xref>
] Another instance for bone preservation before orthodontic therapy is alveolar cleft defects (ACD). In 1908 Lexar reported the first graft of the ACD.[<xref ref-type="bibr" rid="ref28">28</xref>
] The objectives of graft in ACD are ONF closure, adequate bone support for the dentition, adequate bone volume and favorable ridge architecture,[<xref ref-type="bibr" rid="ref29">29</xref>
] and elimination of mucosal recess.[<xref ref-type="bibr" rid="ref30">30</xref>
] The secondary osteoplasty provides a bone matrix for eruption of the permanent teeth (especially canine) and supports the permanent teeth through OTM.[<xref ref-type="bibr" rid="ref31">31</xref>
]</p>
<p>In 1996, Diedrich[<xref ref-type="bibr" rid="ref20">20</xref>
] succeeded in using guided tissue regeneration to improve periodontal condition to move tooth into infrabony defects. Naaman[<xref ref-type="bibr" rid="ref32">32</xref>
] reported a successful movement of teeth into grafted site three months after bone implantation. In 2007, Oltramari <italic>et al</italic>
.[<xref ref-type="bibr" rid="ref33">33</xref>
] moved tooth into a minipig bone defect, filled with xenogenic graft. They demonstrated the possibility of action and a similar distance of OTM both as in sockets with secondary healing.</p>
<p>Tooth movement and tooth eruption into a graft site is an inevitable phenomenon. More research should be carried out to identify and reduce risks and offer the patient greater safety during orthodontic therapy. The purpose of the present study is to detect the effect of orthodontic socket preservation by DFDBA (CenoBone<sup>®</sup>
) on the amount of OTM and root resorption. Also the effectiveness of this bone substitute (CenoBone<sup>®</sup>
) will be investigated for preserving the alveolar height.</p>
</sec>
<sec sec-type="materials|methods" id="sec1-2"><title>MATERIALS AND METHODS</title>
<p>Twelve sites in three dogs were investigated as an experimental split-mouth study. All of the dogs were males and German race with the age range of 13±1 months and weight range of 20±5 kg. The animals were caged individually and fed with dog food. CenoBone<sup>®</sup>
(Tissue Regeneration Corporation, Kish Island, Iran) crushed was used as the DFDBA graft material.</p>
<p>Sedation was performed by intramuscular injection of 0.27 mg/kg diazepam (Chemi Daru, Tehran, Iran) and 5.5 mg/kg ketamine (Parke-Davis, Detroit, Michigan, USA). The angiocath was placed against cephalic vein and general anesthesia started with 1 gr Nesdonal infusion throughout the surgery. The extraction sites were prepared by the extraction of 3<sup>rd</sup>
premolar. The clinicians tried to perform extractions as low traumatic as possible by forceps and elevators in different sizes and shapes. On one side of each jaw, the defects were preserved as the experimental group by bone substitute i.e., DFDBA (CenoBone<sup>®</sup>
), the other side served as the control group for secondary healing. For placing the bone substitute, crushed DFDBA was packed into the socket area by a cylindrical flat ended instrument 1 mm in diameter. Simultaneously the teeth adjacent to the defects were pulled together by a NiTi-based closed-coil spring (Ormco<sup>®</sup>
, Orange, California, USA). A 0.012 inch soft (dead) stainless steel wire was placed around the cementoenamel junction (CEJ). The wires on collar of the teeth were fixed by a NO-MIX (Dentaurum<sup>®</sup>
, Inc., Ispringen, Germany) composite [<xref ref-type="fig" rid="F1">Figure 1</xref>
]. The sites were examined for any appliance dislodgement weekly. Intramuscular injection of antibiotic Cephalosporin (Iran Pharmaceutical Export Company, Tehran, Iran), 30 mg/kg/j was prescribed for 48 h after surgery.</p>
<fig id="F1" position="float"><label>Figure 1</label>
<caption><p>NiTi closed-coil springs attached with wire and bonded with NO-MIX<sup>®</sup>
composite</p>
</caption>
<graphic xlink:href="DRJ-9-203-g001"></graphic>
</fig>
<p>After eight weeks, radiographs were taken and the amounts of OTM were measured by comparing the changes of distance between the adjacent teeth. The exact amounts of tooth movement were measured clinically by Boley Gauge Caliper with sharp tips located at the CEJ of crowns and then were compared and double checked by radiographs. The distance between the line connecting CEJ of teeth on the both sides of extraction site and the underlying bone was measured radiographically and magnification was considered and corresponding calculations were conducted. The radiographs were studied to evaluate the success of the graft. The experiment was performed according to the Ethics Committee of Shahid Beheshti University of Medical Science.</p>
<p>After that, the animals were sacrificed by Nesdonal overdose. The studying areas were removed from the jaw and fixed in Formalin 40%. The fixed blocks were soaked in Formic acid for 6 months. Decalcified sites were cut into pieces as small as the root and the adjacent bone area. After usual histologic preparations mesiodistal sections were cut with a microtome set at 4 μm.</p>
<p>Quantitative histomorphometric assessments of the coded specimens were made by the same examiner twice. Analysis of variance was performed by statistical package of SPSS (version 15) for purpose of comparison between two groups.</p>
</sec>
<sec sec-type="results" id="sec1-3"><title>RESULTS</title>
<sec id="sec2-1"><title>Orthodontic tooth movement</title>
<p>Measurements revealed a slight increase in OTM at grafted sites as they were compared to the control sites on the other side of the jaw (<italic>P</italic>
<0.05). Mean movement of the teeth opposed to graft was 3.7±1.83mm that is about 37% greater than the control group (2.7±1.7 mm). This difference was statically significant. One-Sample Kolmogorov–Smirnov test was used to determine whether the data set is well-modeled by a normal distribution or not. The distribution of vectors was normal.</p>
</sec>
<sec id="sec2-2"><title>Vertical bone atrophy</title>
<p>Using one-sample Kolmogorov–Smirnov test, the normal distribution of the measured data was checked. There was statically significant difference (<italic>P</italic>
<0.05) between the grafted sites (1.79±0.4 mm) and control sites (2.67±0.61 mm).The mentioned values determine significant bone resorption in control site and successful socket preservation in experimental site (<italic>P</italic>
<0.05) [<xref ref-type="fig" rid="F2">Figure 2</xref>
].</p>
<fig id="F2" position="float"><label>Figure 2</label>
<caption><p>(a) NiTi closed-coil springs in the lower jaw extraction site. (b) A radiograph taken from the same site</p>
</caption>
<graphic xlink:href="DRJ-9-203-g002"></graphic>
</fig>
</sec>
<sec id="sec2-3"><title>Root resorption</title>
<p>The prepared samples were studied by an expert examiner and the amounts of root resorption were categorized in groups named 0 through 8; 0 for the ones with no recognizable resorption lacuna and 8 for the highest amount of resorption, others were divided in levels between them by the amount of their lacunae.</p>
<p>Using Friedman analysis, the level of root resorption was compared between the two groups (i.e. the grafted and the healing site). The resorption level was lower in grafted sites than the normal healing site (<italic>P</italic>
<0.05) [<xref ref-type="fig" rid="F3">Figure 3</xref>
].</p>
<fig id="F3" position="float"><label>Figure 3</label>
<caption><p>A resorptive lacuna is present near the arrow in the control site</p>
</caption>
<graphic xlink:href="DRJ-9-203-g003"></graphic>
</fig>
</sec>
</sec>
<sec sec-type="discussion" id="sec1-4"><title>DISCUSSION</title>
<p>This statically significant difference in the amount of tooth movement between the experimental groups means the success of tooth movement into the experiment sites filled with DFDBA with slight increase in OTM rate. This observation is opposite to Oltramary <italic>et al</italic>
.[<xref ref-type="bibr" rid="ref33">33</xref>
] that moved teeth into a defect previously filled with xenograft in test group and filled with blood clots in the control group. They suggested a similar distance of OTM both in test and control group. In their study, orthodontic movement started after 3 months of healing of the grafted site. They allocated a healing period for organization of bone substitute in the alveolar socket. The time taken for the study has been even more in other studies like Kawamoto studies in Japan waiting for 4 months. But the mentioned healing period was eliminated by authors and no clinical change was observed. Yaun <italic>et al</italic>
.[<xref ref-type="bibr" rid="ref34">34</xref>
] suggested that orthodontic retraction into extraction sites should be initiated at an early stage after tooth extraction. They claimed that this could use the advantage of bone remodeling in extraction sites. So they proposed the start of orthodontic movement about a week after extraction without any augmentation in the socket. They also suggested that the tooth on the recent extraction side moved faster than that on the healed side.[<xref ref-type="bibr" rid="ref35">35</xref>
]</p>
<p>BMP molecules that may be present in DFDBA may be one of the reasons for increasing bone turnover rate. By starting orthodontic treatment just after DFDBA grafting, we can use BMPs potentials for increasing the turnover rate at the same time that it helps for bone height preservation.[<xref ref-type="bibr" rid="ref36">36</xref>
]</p>
<p>Eight weeks after implantation of the graft, radiographic linear measurements, comparing the bone level with CEJ of adjacent teeth, revealed statistically significant decrease in the amount of bone loss in grafted sites. This finding suggests that the allograft reduces the bone atrophy at the defects. This capability of preserving greater bone height is in agreement with findings of previous animal experiments.</p>
<p>Rate of alveolar bone atrophy is attributed to a variety of factors which Atwood[<xref ref-type="bibr" rid="ref37">37</xref>
] divided into four categories: anatomic, metabolic, functional and prosthetic. Although other studies agree with decreased alveolar atrophy using DFDBA,[<xref ref-type="bibr" rid="ref23">23</xref>
] but the level of bone regenerated in the extraction sockets will never reach the bone level attached to the tooth surface.[<xref ref-type="bibr" rid="ref38">38</xref>
] This bone loss may be slighter in human experiments because of reduced level of gingival inflammation. This attributes to loss of hygienic functions because of using orthodontic wires and springs in dog. The other suggesting reason is that using human allograft in dogs means losing the osteoinductive potential of the allograft because it functions as a xenograft in dogs (osteoinductive materials can induce differentiation of mesenchymal cells into chondroblasts and osteoblasts and improving bone formation[<xref ref-type="bibr" rid="ref39">39</xref>
] ). Also moving the adjacent teeth through the graft may have deleterious effects on the remodeling of bone.</p>
<p>As it was mentioned, the data is collected at the end of treatment period (after 8 weeks), but alteration of tooth movement during the experiment period is an issue of concern for further investigation. So, further studies are needed to identify any difference in OTM rate within or even after this time period.</p>
<p>Lower root resorption level shows the effectiveness of using DFDBA socket preservation in reducing one of the major side effects of orthodontic therapy.</p>
</sec>
<sec sec-type="conclusion" id="sec1-5"><title>CONCLUSION</title>
<p>Following socket preservation, OTM can be immediately initiated without waiting for the healing of the recipient site. Using a bone alloplast graft for its approved effects on ridge preservation has become common in today's practice. The possibility of immediate orthodontic treatment helps the patient gain his esthetics and function as soon as possible.</p>
<p>Using DFDBA during orthodontic treatment will increase the rate of OTM. This can also decrease the treatment period.</p>
<p>Using DFDBA at extraction site as a socket preservation method could reduce root resorption after OTM through the extraction site.</p>
<p>Cenobone<sup>®</sup>
DFDBA is approved for its ability in socket height preservation and it could be proposed for clinical applications such as socket preservation and alveolar cleft grafting.</p>
</sec>
</body>
<back><ack><title>ACKNOWLEDGEMENT</title>
<p>Authors wish to thank Center for Dental Research for their financial support and Tissue Regeneration Corporation. Cenobone<sup>®</sup>
is the product of Tissue Regeneration Corporation (TRC, 3<sup>rd</sup>
industrial park, Kish free zone, Kish Island, Iran) that is linked to Iranian tissue bank to prepare a wide range of machined allografts.</p>
</ack>
<fn-group><fn fn-type="supported-by"><p><bold>Source of Support:</bold>
Nil</p>
</fn>
<fn fn-type="conflict"><p><bold>Conflict of Interest:</bold>
None declared.</p>
</fn>
</fn-group>
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