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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Analysis of factors associated with maintenance discontinuation in implant patients</title><author><name sortKey="Arai, Korenori" sort="Arai, Korenori" uniqKey="Arai K" first="Korenori" last="Arai">Korenori Arai</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Takeda, Yoshihiro" sort="Takeda, Yoshihiro" uniqKey="Takeda Y" first="Yoshihiro" last="Takeda">Yoshihiro Takeda</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Mori, Yurie" sort="Mori, Yurie" uniqKey="Mori Y" first="Yurie" last="Mori">Yurie Mori</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Terauchi, Rie" sort="Terauchi, Rie" uniqKey="Terauchi R" first="Rie" last="Terauchi">Rie Terauchi</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Furumori, Takashi" sort="Furumori, Takashi" uniqKey="Furumori T" first="Takashi" last="Furumori">Takashi Furumori</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Tanaka, Sachiko" sort="Tanaka, Sachiko" uniqKey="Tanaka S" first="Sachiko" last="Tanaka">Sachiko Tanaka</name><affiliation><nlm:aff id="Aff2">Department of biotatistics, Shiga University of Medical Science, Otsu, Japan</nlm:aff></affiliation></author><author><name sortKey="Miyake, Tatsuro" sort="Miyake, Tatsuro" uniqKey="Miyake T" first="Tatsuro" last="Miyake">Tatsuro Miyake</name><affiliation><nlm:aff id="Aff3">Department of Preventive and Community Dentistry, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Baba, Shunsuke" sort="Baba, Shunsuke" uniqKey="Baba S" first="Shunsuke" last="Baba">Shunsuke Baba</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Kawazoe, Takayoshi" sort="Kawazoe, Takayoshi" uniqKey="Kawazoe T" first="Takayoshi" last="Kawazoe">Takayoshi Kawazoe</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26688781</idno><idno type="pmc">4676775</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4676775</idno><idno type="RBID">PMC:4676775</idno><idno type="doi">10.1186/s40064-015-1569-3</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000D75</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000D75</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Analysis of factors associated with maintenance discontinuation in implant patients</title><author><name sortKey="Arai, Korenori" sort="Arai, Korenori" uniqKey="Arai K" first="Korenori" last="Arai">Korenori Arai</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Takeda, Yoshihiro" sort="Takeda, Yoshihiro" uniqKey="Takeda Y" first="Yoshihiro" last="Takeda">Yoshihiro Takeda</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Mori, Yurie" sort="Mori, Yurie" uniqKey="Mori Y" first="Yurie" last="Mori">Yurie Mori</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Terauchi, Rie" sort="Terauchi, Rie" uniqKey="Terauchi R" first="Rie" last="Terauchi">Rie Terauchi</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Furumori, Takashi" sort="Furumori, Takashi" uniqKey="Furumori T" first="Takashi" last="Furumori">Takashi Furumori</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Tanaka, Sachiko" sort="Tanaka, Sachiko" uniqKey="Tanaka S" first="Sachiko" last="Tanaka">Sachiko Tanaka</name><affiliation><nlm:aff id="Aff2">Department of biotatistics, Shiga University of Medical Science, Otsu, Japan</nlm:aff></affiliation></author><author><name sortKey="Miyake, Tatsuro" sort="Miyake, Tatsuro" uniqKey="Miyake T" first="Tatsuro" last="Miyake">Tatsuro Miyake</name><affiliation><nlm:aff id="Aff3">Department of Preventive and Community Dentistry, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Baba, Shunsuke" sort="Baba, Shunsuke" uniqKey="Baba S" first="Shunsuke" last="Baba">Shunsuke Baba</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author><author><name sortKey="Kawazoe, Takayoshi" sort="Kawazoe, Takayoshi" uniqKey="Kawazoe T" first="Takayoshi" last="Kawazoe">Takayoshi Kawazoe</name><affiliation><nlm:aff id="Aff1">Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</nlm:aff></affiliation></author></analytic><series><title level="j">SpringerPlus</title><idno type="eISSN">2193-1801</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Maintenance following implant treatment is essential to ensure long-term stability. Accordingly, the objective of this study was to investigate the factors leading patients to discontinue maintenance following implant treatment. Among the 729 patients that underwent implantation at the Department of Oral Implantology, Osaka Dental University Hospital from January 2008 to December 2012, 41 patients were excluded from the study. Exclusion criteria comprised patients without a superstructure attachment, those who only underwent maxillary sinus floor augmentation procedures and those who discontinued visiting the hospital prior to superstructure attachment. Treatment was discontinued in 181 patients. The rate of discontinuation was 26.6 %. The odds ratio (OR) in the adjustment model was 1.552 (95 % CI 1.078–2.236) in males when compared with females. When compared with those who were 30–64 years old, the OR was 5.818 (95 % CI 3.017–11.220) in those 29 years old or younger and 1.561 (95 % CI 1.021–2.386) in those 65 years old or older. Moreover, when compared with those with a O’Leary’s Plaque Control Record of all teeth and superstructures (PCR) level of 20 % or less following superstructure attachment, the OR was 2.113 (95 % CI 1.471–3.035) in those with a PCR level of 20 % or more following superstructure attachment. It is highly important to decrease maintenance discontinuation, especially in patients aged 29 years old or younger with a PCR level of 20 % or more following superstructure attachment. Moreover, a support system must be developed to enable patients with difficulties visiting the hospital to continue their maintenance program.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Buser, D" uniqKey="Buser D">D Buser</name></author><author><name sortKey="Janner, Sf" uniqKey="Janner S">SF Janner</name></author><author><name sortKey="Wittneben, Jg" uniqKey="Wittneben J">JG Wittneben</name></author><author><name sortKey="Bragger, U" uniqKey="Bragger U">U Bragger</name></author><author><name sortKey="Ramseier, Ca" uniqKey="Ramseier C">CA Ramseier</name></author><author><name sortKey="Salvi, Ge" uniqKey="Salvi G">GE Salvi</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Chinatsu, F" uniqKey="Chinatsu F">F Chinatsu</name></author><author><name sortKey="Junko, M" uniqKey="Junko M">M Junko</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Costa, Fo" 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open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Springerplus</journal-id><journal-id journal-id-type="iso-abbrev">Springerplus</journal-id><journal-title-group><journal-title>SpringerPlus</journal-title></journal-title-group><issn pub-type="epub">2193-1801</issn><publisher><publisher-name>Springer International Publishing</publisher-name><publisher-loc>Cham</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26688781</article-id><article-id pub-id-type="pmc">4676775</article-id><article-id pub-id-type="publisher-id">1569</article-id><article-id pub-id-type="doi">10.1186/s40064-015-1569-3</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research</subject></subj-group></article-categories><title-group><article-title>Analysis of factors associated with maintenance discontinuation in implant patients</article-title></title-group><contrib-group><contrib contrib-type="author" equal-contrib="yes"><name><surname>Arai</surname><given-names>Korenori</given-names></name><address><email>arai-k@cc.osaka-dent.ac.jp</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author" corresp="yes" equal-contrib="yes"><name><surname>Takeda</surname><given-names>Yoshihiro</given-names></name><address><email>takeda-y@cc.osaka-dent.ac.jp</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Mori</surname><given-names>Yurie</given-names></name><address><email>mori-yu@cc.osaka-dent.ac.jp</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Terauchi</surname><given-names>Rie</given-names></name><address><email>tink_never_land@hotmail.co.jp</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Furumori</surname><given-names>Takashi</given-names></name><address><email>furumori@mitene.or.jp</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Tanaka</surname><given-names>Sachiko</given-names></name><address><email>sachikot@belle.shiga-med.ac.jp</email></address><xref ref-type="aff" rid="Aff2"></xref></contrib><contrib contrib-type="author"><name><surname>Miyake</surname><given-names>Tatsuro</given-names></name><address><email>miyake-t@cc.osaka-dent.ac.jp</email></address><xref ref-type="aff" rid="Aff3"></xref></contrib><contrib contrib-type="author"><name><surname>Baba</surname><given-names>Shunsuke</given-names></name><address><email>baba-s@cc.osaka-dent.ac.jp</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Kawazoe</surname><given-names>Takayoshi</given-names></name><address><email>kawazoe@cc.osaka-dent.ac.jp</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><aff id="Aff1"><label></label>Department of Oral Implantology, Osaka Dental University, Hirakata, Japan</aff><aff id="Aff2"><label></label>Department of biotatistics, Shiga University of Medical Science, Otsu, Japan</aff><aff id="Aff3"><label></label>Department of Preventive and Community Dentistry, Osaka Dental University, Hirakata, Japan</aff></contrib-group><pub-date pub-type="epub"><day>12</day><month>12</month><year>2015</year></pub-date><pub-date pub-type="pmc-release"><day>12</day><month>12</month><year>2015</year></pub-date><pub-date pub-type="collection"><year>2015</year></pub-date><volume>4</volume><elocation-id>767</elocation-id><history><date date-type="received"><day>9</day><month>9</month><year>2015</year></date><date date-type="accepted"><day>26</day><month>11</month><year>2015</year></date></history><permissions><copyright-statement>© Arai et al. 2015</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"><p>Maintenance following implant treatment is essential to ensure long-term stability. Accordingly, the objective of this study was to investigate the factors leading patients to discontinue maintenance following implant treatment. Among the 729 patients that underwent implantation at the Department of Oral Implantology, Osaka Dental University Hospital from January 2008 to December 2012, 41 patients were excluded from the study. Exclusion criteria comprised patients without a superstructure attachment, those who only underwent maxillary sinus floor augmentation procedures and those who discontinued visiting the hospital prior to superstructure attachment. Treatment was discontinued in 181 patients. The rate of discontinuation was 26.6 %. The odds ratio (OR) in the adjustment model was 1.552 (95 % CI 1.078–2.236) in males when compared with females. When compared with those who were 30–64 years old, the OR was 5.818 (95 % CI 3.017–11.220) in those 29 years old or younger and 1.561 (95 % CI 1.021–2.386) in those 65 years old or older. Moreover, when compared with those with a O’Leary’s Plaque Control Record of all teeth and superstructures (PCR) level of 20 % or less following superstructure attachment, the OR was 2.113 (95 % CI 1.471–3.035) in those with a PCR level of 20 % or more following superstructure attachment. It is highly important to decrease maintenance discontinuation, especially in patients aged 29 years old or younger with a PCR level of 20 % or more following superstructure attachment. Moreover, a support system must be developed to enable patients with difficulties visiting the hospital to continue their maintenance program.</p></abstract><kwd-group xml:lang="en"><title>Keywords</title><kwd>Implant treatment followed</kwd><kwd>Elderly patients</kwd><kwd>Health awareness</kwd><kwd>Behavior modification</kwd><kwd>After implant therapy</kwd><kwd>Dental implants</kwd></kwd-group><custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name><meta-value>© The Author(s) 2015</meta-value></custom-meta></custom-meta-group></article-meta></front><body><sec id="Sec1"><title>Background</title><p>In the clinical setting, prevention is becoming the focus of attention rather than therapy, along with changes in the understanding of dental disease. Considering that the prevalence of periodontal disease in adults is very high, the development of a preventive management system that periodically and efficiently controls the onset and progression of the disease, leading to a reduction in tooth loss, is essential (Hideto et al. <xref ref-type="bibr" rid="CR7">1998</xref>). In recent years, implant therapy has rapidly spread in Japan as a treatment method for the replacement of missing teeth, with good clinical performance having been achieved (Krebs et al. <xref ref-type="bibr" rid="CR10">2015</xref>; Karoussis et al. <xref ref-type="bibr" rid="CR9">2004</xref>; Haas et al. <xref ref-type="bibr" rid="CR6">1996</xref>; Buser et al. <xref ref-type="bibr" rid="CR1">2012</xref>; Lekholm et al. <xref ref-type="bibr" rid="CR13">1999</xref>; Covani et al. <xref ref-type="bibr" rid="CR4">2012</xref>; Lambrecht et al. <xref ref-type="bibr" rid="CR12">2003</xref>). Moreover, the survival rate of implants is lower in patients who do not undergo maintenance following therapy, and it has been found that these patients also have a higher incidence of prosthetic complications when compared with patients undergoing regular maintenance (Roccuzzo et al. <xref ref-type="bibr" rid="CR15">2010</xref>; Costa et al. <xref ref-type="bibr" rid="CR3">2012</xref>; Hultin et al. <xref ref-type="bibr" rid="CR8">2007</xref>). Therefore, continued maintenance is necessary to achieve long-term implant stability. However, there are a considerable number of patients who discontinue hospital visits for implant maintenance. Therefore, the objective of this study was to identify the factors associated with discontinuation of the maintenance phase in implant-treated patients.</p></sec><sec id="Sec2"><title>Patients and methods</title><sec id="Sec3"><title>Research design</title><p>A case–controlled study design was employed, using the database of the Department of Oral Implantology, Osaka Dental University.</p></sec><sec id="Sec4"><title>Setting and participants</title><p>The participants consisted of 729 patients who underwent implant placement at the Department of Oral Implantology, Osaka Dental University Hospital from January 2008 to December 2012. The study was carried out until October 31, 2014.</p></sec><sec id="Sec5"><title>Exclusion criteria</title><p>Among the 729 patients who underwent implantation, 41 patients were excluded from the study based on the following criteria: patients without a superstructure attachment, patients who only underwent the maxillary sinus floor augmentation procedure, and patients who discontinued visiting the hospital prior to superstructure attachment.</p></sec><sec id="Sec6"><title>Investigation items</title><p>The following survey items were extracted for each participant: address, sex, age at implant placement, O’Leary’s Plaque Control Record of all teeth and superstructures (PCR) level at the initial visit, PCR level following attachment of the superstructure, the number of implants, and the number of missing teeth.</p></sec><sec id="Sec7"><title>Definition of the maintenance continuation and discontinuation groups</title><p>We defined patients who were continuing maintenance as of October 31, 2014 as the maintenance continuation group (herein after referred to as the continuation group), and patients who discontinued maintenance for 6 months or more as the maintenance discontinuation group (herein after referred to as the discontinuation group). Patients who discontinued maintenance a single time were placed in the discontinuation group, even if they later revisited the hospital for further maintenance.</p></sec><sec id="Sec8"><title>Variables</title><p>The aforementioned survey items collected from subjects in the continuation and discontinuation groups were set according to the following category variables. The patients were divided into two groups according to their address, i.e., whether it was within Osaka City (near the hospital location), or outside Osaka City. The age at implantation was divided into the three groups of ≤29 years old, 30–64 years old, and ≥65 years old. The PCR level at the initial visit was divided into two groups, ≤20 and >20 %, and the PCR level following attachment of the superstructure was divided into two groups, ≤20 and >20 %. Moreover, the number of implants and missing teeth in the continuation and discontinuation groups were used as continuous quantitative data.</p></sec><sec id="Sec9"><title>Data measurement method</title><p>We used surgery data from Osaka Dental University and the patients’ medical records to acquire relevant information. Participant groups were extracted from the surgery data book, with the participants’ survey items sampled from the medical records, and confirmation was made regarding whether maintenance was continued as of October 31, 2014.</p></sec><sec id="Sec10"><title>Statistical analysis</title><p>Among the 688 patients included in this study, 181 patients were in the discontinuation group, indicating a discontinuation rate of 26.6 %.</p><p>The χ<sup>2</sup> test, Fisher’s exact test, and Mann–Whitney <italic>U</italic> test were conducted on each survey item in the continuation and discontinuation groups. Subsequently, binomial logistic regression analysis was carried out with discontinuation of maintenance as the dependent variable and patient address, sex, age at implant placement, number of implants, PCR at initial consultation, and PCR following attachment of the superstructure as the independent variables. The stepwise variable selection method by likelihood-ratio testing was used to select variables to measure the odds ratio (OR) with a 95 % confidence interval (CI). All survey items were used as category variables, while the number of implants and missing teeth were used as continuous quantitative data. The IBM SPSS Statistics 22 software program (IBM, Armonk, NY, USA) was used for statistical analysis.</p></sec><sec id="Sec11"><title>Ethical considerations</title><p>This study was implemented according to the modified declaration at Edinburgh, UK based on the Declaration of Helsinki (October 2000). A research plan taking into consideration the protection of human rights and benefits to the subjects was proposed, and the study was carried out upon approval from the Ethics Committee of Osaka Dental University (authorization number: Osaka Dental University Medical Ethics No. 110733) while ensuring the protection of personal information.</p></sec></sec><sec id="Sec12"><title>Results</title><p>Table <xref rid="Tab1" ref-type="table">1</xref> provides a summary of the patients’ backgrounds. Although no statistically significant difference was observed between the continuation and discontinuation groups regarding patient addresses, the number of implants, the number of missing teeth, and the PCR level at the initial visit, a statistically significant difference was observed between the two groups regarding sex, age, and PCR level following attachment of the superstructure (Table <xref rid="Tab1" ref-type="table">1</xref>).<table-wrap id="Tab1"><label>Table 1</label><caption><p>Characteristics of patients’ backgrounds at Osaka Dental University Hospital</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left"></th><th align="left">Continuation group</th><th align="left">Discontinuation group</th><th align="left">p value</th></tr></thead><tbody><tr><td align="left" colspan="4">Address </td></tr><tr><td align="left"> Within Osaka city</td><td char="." align="char">180</td><td char="." align="char">73</td><td align="left"></td></tr><tr><td align="left"> Outside Osaka city</td><td char="." align="char">325</td><td char="." align="char">110</td><td char="." align="char">0.326</td></tr><tr><td align="left" colspan="4">Sex</td></tr><tr><td align="left"> Female</td><td char="." align="char">326</td><td char="." align="char">91</td><td align="left"></td></tr><tr><td align="left"> Male</td><td char="." align="char">179</td><td char="." align="char">92</td><td char="." align="char">0.001</td></tr><tr><td align="left" colspan="4">Age</td></tr><tr><td align="left"> 30–64</td><td char="." align="char">389</td><td char="." align="char">106</td><td align="left"></td></tr><tr><td align="left"> ≤29</td><td char="." align="char">16</td><td char="." align="char">31</td><td align="left"></td></tr><tr><td align="left"> 65≤</td><td char="." align="char">100</td><td char="." align="char">46</td><td align="left"><0.001</td></tr><tr><td align="left" colspan="4">PCR<sup>*</sup>1 </td></tr><tr><td align="left"> 20 % or less</td><td char="." align="char">143</td><td char="." align="char">38</td><td align="left"></td></tr><tr><td align="left"> 20 % or more</td><td char="." align="char">362</td><td char="." align="char">145</td><td char="." align="char">0.050</td></tr><tr><td align="left" colspan="4">PCR<sup>*</sup>2</td></tr><tr><td align="left"> 20 % or less</td><td char="." align="char">306</td><td char="." align="char">70</td><td align="left"></td></tr><tr><td align="left"> 20 % or more</td><td char="." align="char">199</td><td char="." align="char">113</td><td align="left"><0.001</td></tr><tr><td align="left" colspan="4">Number of implants</td></tr><tr><td align="left"> Median</td><td char="." align="char">2</td><td char="." align="char">2</td><td char="." align="char">0.141</td></tr><tr><td align="left" colspan="4">Number of missing teeth</td></tr><tr><td align="left"> Median</td><td char="." align="char">4</td><td char="." align="char">5</td><td char="." align="char">0.481</td></tr></tbody></table><table-wrap-foot><p>Proportions across levels of categorical variables were compared using the χ<sup>2</sup> test and Fisher exact test. Medians for continuous variables were compared using the Mann–Whitney U test</p><p><italic>Age</italic> age at implant placement, <italic>PCR</italic><sup><italic>*</italic></sup><italic>1</italic> PCR level at the initial visit, <italic>PCR</italic><sup><italic>*</italic></sup><italic>2</italic> PCR level following attachment of the superstructure</p></table-wrap-foot></table-wrap></p><p>According to the results of a logistic regression analysis, sex, age, and PCR level following attachment of the superstructure were extracted as independent factors. At step 1 of the adjustment model, age was added as a variable; subsequently, PCR level following attachment of the superstructure was added as a variable at step 2, and sex was added as a variable at step 3. The OR of the adjustment model at step 3 was 1.6 (95 % CI 1.1–2.2) for males when compared with females. It was 5.8 (95 % CI 3.0–11.2) for those ≤29 years old in comparison with those 30–64 years old, and 1.6 (95 % CI 1.0–2.4) for those ≥65 years old. Moreover, it was 2.1 (95 % CI 1.5–3.0) for PCR level of >20 % when compared with ≤20 % following attachment of the superstructure (Table <xref rid="Tab2" ref-type="table">2</xref>). The predictive value of differentiation between the predicted and actual value was 75.7 %.<table-wrap id="Tab2"><label>Table 2</label><caption><p>Adjusted odds ratios for maintenance discontinuation by case definition</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="2"></th><th align="left" colspan="3">Odds ratio (95 % CI), p value</th></tr><tr><th align="left">Step 1</th><th align="left">Step 2</th><th align="left">Step 3</th></tr></thead><tbody><tr><td align="left" colspan="4">Age</td></tr><tr><td align="left"> 30–64</td><td align="left">1.0(ref)</td><td align="left">1.0(ref)</td><td align="left">1.0(ref)</td></tr><tr><td align="left"> ≤29</td><td align="left">7.1 (3.75–13.5), <0.001</td><td align="left">6.0 (3.1–11.5), <0.001</td><td align="left">5.8 (3.0–11.2), <0.001</td></tr><tr><td align="left"> 65≤</td><td align="left">1.7 (1.1–2.5), 0.012</td><td align="left">1.7 (1.1–2.6), 0.013</td><td align="left">1.6 (1.0–2.4), 0.040</td></tr><tr><td align="left" colspan="4">PCR</td></tr><tr><td align="left"> 20 % or less</td><td align="left"></td><td align="left">1.0(ref)</td><td align="left">1.0(ref)</td></tr><tr><td align="left"> 20 % or more</td><td align="left"></td><td align="left">2.2 (1.6–3.2), <0.001</td><td align="left">2.1 (1.5–3.0), <0.001</td></tr><tr><td align="left" colspan="4">Sex</td></tr><tr><td align="left"> Female</td><td align="left"></td><td align="left"></td><td align="left">1.0(ref)</td></tr><tr><td align="left"> Male</td><td align="left"></td><td align="left"></td><td align="left">1.6 (1.1–2.2), 0.018</td></tr></tbody></table><table-wrap-foot><p>These multivariate odds ratios for maintenance discontinuation were adjusted for address, sex, age at implant placement, <italic>PCR</italic> level at the initial visit, <italic>PCR</italic> level following attachment of the superstructure, the number of implants, and the number of missing teeth</p><p><italic>Age</italic> age at implant placement, <italic>PCR</italic> PCR level following attachment of the superstructure</p></table-wrap-foot></table-wrap></p></sec><sec id="Sec13"><title>Discussion and conclusion</title><p>In our department, the maximum maintenance interval following implant therapy is 6 months. Therefore, in this study, the discontinuation group was differentiated at 6 months.</p><p>Standards were set for each survey item and then stratified. A PCR value of ≤20 % was the target prior to implantation, so regarding the PCR level at the initial visit and following attachment of the superstructure, the subjects were divided into two groups, with 20 % as the standard. The subjects were divided into three groups, according to age, with the first group at ≤29 years old because the average age at first marriage in Japan is approximately 30 years old in both males and females. The third group, ≥65 years old, was created because the World Health Organization defines people aged 65 years or older as “elderly”. Regarding the patient addresses, the subjects were divided into two groups, those living inside and outside Osaka City, because the hospital associated with this study is located in Osaka City.</p><p>Revisits by the discontinuation group were not investigated in this study because it was difficult to conduct a follow-up on the reasons for such visits. Moreover, because the subjects were limited to patients visiting the university hospital, there was a lack of generalizability.</p><p>Therefore, these factors are considered to be limitations associated with this study. Because there are few objective investigations following implant therapy in other epidemiologic studies, providing evidence using the databases of multiple institutes may therefore be necessary in future studies.</p><p>The subjects of this study were not a representation of the general citizens of Japan, but rather consisted of people who underwent implant therapy at a university hospital, which is an expensive private medical expense and is not covered by the National Health Insurance System. In an awareness survey conducted following attachment of the superstructure, 41.7 % of patients (25/60) replied that they feel anxiety regarding cleaning the implant (Tomoko et al. <xref ref-type="bibr" rid="CR17">2007</xref>). Therefore, it is believed that the subjects of this study have a relatively high interest in oral hygiene when compared with the general public, and a greater understanding of the importance of maintenance. Periodical maintenance has a profound effect on preventing inflammation in the tissues surrounding both implants and natural teeth (Krebs et al. <xref ref-type="bibr" rid="CR10">2015</xref>; Karoussis et al. <xref ref-type="bibr" rid="CR9">2004</xref>; Haas et al. <xref ref-type="bibr" rid="CR6">1996</xref>; Buser et al. <xref ref-type="bibr" rid="CR1">2012</xref>; Lekholm et al. <xref ref-type="bibr" rid="CR13">1999</xref>; Covani et al. <xref ref-type="bibr" rid="CR4">2012</xref>; Lambrecht et al. <xref ref-type="bibr" rid="CR12">2003</xref>). Moreover, the lack of adhesion to supporting periodontal therapy (SPT) was associated with a higher incidence of bone loss and implant loss (Tsuyoshi et al. <xref ref-type="bibr" rid="CR18">2011</xref>; Chinatsu and Junko <xref ref-type="bibr" rid="CR2">2007</xref>) mentioned that in their maintenance discontinuation group, no significant difference was observed across sex, age, address, and the number of remaining teeth upon periodontal therapy (Kyoko et al. <xref ref-type="bibr" rid="CR11">1985</xref>; Mizuki et al. <xref ref-type="bibr" rid="CR14">1995</xref>, <xref ref-type="bibr" rid="CR19">2011</xref>). Similarly in our study, no significant difference was observed between the discontinuation and continuation groups regarding patient address, number of missing teeth, and number of implants; however, a significant difference was observed between the two groups regarding sex, age, and the PCR level following attachment of the superstructure. Moreover, the high discontinuation rate in patients aged ≤29 years old may be attributed to the reduced attention to health issues that is often observed among people in their twenties (<xref ref-type="bibr" rid="CR19">2011</xref>).</p><p>There may have been a higher discontinuation rate in men compared with women because of difficulty visiting the hospital during consultation hours (9 am–5 pm on weekdays) because of their jobs. Accordingly, the development of a connection between our hospital and dental clinics allowing patients to visit outside office hours is necessary.</p><p>There have been reports that the number of patients visiting dental clinics greatly declines in patients aged 65 years or older (Roccuzzo et al. <xref ref-type="bibr" rid="CR16">2012</xref>; Frisch et al. <xref ref-type="bibr" rid="CR5">2014</xref>). 65 years old or more may have a time to spare regardless of sex. It is guessed that some discontinuation group patients aged ≥65 years became unable to make visits to our department because of old age. A new system must therefore be developed to allow the delivery of a maintenance program to patients who have difficulty making regular hospital visits because of old age.</p><p>Moreover, we must further emphasize the importance of maintenance following implant therapy in patients with a PCR level of >20 % following attachment of the superstructure. It is essential to motivate patients and help them to understand the importance of maintenance in association with implant therapy.</p></sec></body><back><glossary><title>Abbreviation</title><def-list><def-item><term>PCR</term><def><p>O’Leary’s plaque control record</p></def></def-item></def-list></glossary><fn-group><fn><p>K. Arai and Y. Takeda contributed equally to this work</p></fn></fn-group><ack><title>Authors’ contributions</title><p>KA and YT conceived and designed the experiments. AK performed and analyzed the experiments. ST, RT, YM, TF, SB and TK drafted the manuscript. 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