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Article: The effect of subcrestal placement of the polished surface of ITI® implants on marginal soft and hard tissues

TitleThe effect of subcrestal placement of the polished surface of ITI® implants on marginal soft and hard tissues
Authors
Issue Date1996
PublisherWiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.blackwellpublishing.com/journals/CLR
Citation
Clinical Oral Implants Research, 1996, v. 7 n. 4, p. 111-119 How to Cite?
AbstractIn order to achieve esthetically more satisfying results, it has been proposed to place ITI implants with their border between the rough and smooth surfaces below the level of the alveolar crest, thereby obtaining a submucosally located implant shoulder following healing. The aim of the present experimental study was to clinically and radiographically evaluate the tissue response to the placement of one-stage transmucosal implants with the border between the rough and the smooth surfaces sunk by 1 mm into a subcrestal location. 11 patients underwent comprehensive dental care including the placement of 2 implants of the ITI Dental Implant System™ in the same quadrant (test and control). Randomly assigned control implants were placed according to the manufacturer's instructions, i.e. the border between the rough titanium plasma-sprayed and the smooth polished surfaces precisely at the alveolar crest. At the test implants the apical border of the polished surface was placed ∼1 mm below the alveolar crest. Probing bone levels were assessed at implant placement (baseline), 4 and 12 months later. Modified plaque and modified gingival indices were recorded at 1, 2, 3, 4 and 12 months. Clinical probing depth and "attachment" levels were measured at 4 and 12 months. All parameters were assessed at 6 sites around each implant. The mean for each implant was calculated and used for analysis. The Wilcoxon matched pairs signed rank test and the Student t-test were applied to detect differences over time and between the test and control implants. At baseline, a mean difference in probing bone level of -0.86 mm (SD 0.43 mm, p<0.05) was found between test and control implants with the test implants being placed more deeply. Both test and control implants lost a significant amount of clinical bone height during the first 4 months (test 1.16 mm, p<0.05; control 0.58 mm, p<0.05). However, only the test implants significantly lost clinical bone height from 4-12 months (test 1.04 mm, p<0.05; control 0.45 mm, p=0.08). Overall, the test implants lost 2.26 mm and the control implants 1.02 mm of bone height during the first year of service. On the average, the test implants demonstrated a bone level 0.38 mm lower than the controls at 12 months. Except for the modified gingival index at 4 months (mean difference 0.21, SD 0.19, p<0.05), no clinical parameters yielded significant differences between test and control implants at any time. It is concluded that in addition to the crestal bone resorption occurring at implants placed under standard conditions, the bone adjacent to the polished surface of more deeply placed ITI implants is also lost over time. Form a biological point of view, the placement of the border between the rough and the smooth surfaces into a subcrestal location should not be recommended. Copyright © Munksgaard 1996.
Persistent Identifierhttp://hdl.handle.net/10722/153972
ISSN
2015 Impact Factor: 3.464
2015 SCImago Journal Rankings: 1.427
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHämmerle, CHFen_US
dc.contributor.authorBrägger, Uen_US
dc.contributor.authorBürgin, Wen_US
dc.contributor.authorLang, NPen_US
dc.date.accessioned2012-08-08T08:22:35Z-
dc.date.available2012-08-08T08:22:35Z-
dc.date.issued1996en_US
dc.identifier.citationClinical Oral Implants Research, 1996, v. 7 n. 4, p. 111-119en_US
dc.identifier.issn0905-7161en_US
dc.identifier.urihttp://hdl.handle.net/10722/153972-
dc.description.abstractIn order to achieve esthetically more satisfying results, it has been proposed to place ITI implants with their border between the rough and smooth surfaces below the level of the alveolar crest, thereby obtaining a submucosally located implant shoulder following healing. The aim of the present experimental study was to clinically and radiographically evaluate the tissue response to the placement of one-stage transmucosal implants with the border between the rough and the smooth surfaces sunk by 1 mm into a subcrestal location. 11 patients underwent comprehensive dental care including the placement of 2 implants of the ITI Dental Implant System™ in the same quadrant (test and control). Randomly assigned control implants were placed according to the manufacturer's instructions, i.e. the border between the rough titanium plasma-sprayed and the smooth polished surfaces precisely at the alveolar crest. At the test implants the apical border of the polished surface was placed ∼1 mm below the alveolar crest. Probing bone levels were assessed at implant placement (baseline), 4 and 12 months later. Modified plaque and modified gingival indices were recorded at 1, 2, 3, 4 and 12 months. Clinical probing depth and "attachment" levels were measured at 4 and 12 months. All parameters were assessed at 6 sites around each implant. The mean for each implant was calculated and used for analysis. The Wilcoxon matched pairs signed rank test and the Student t-test were applied to detect differences over time and between the test and control implants. At baseline, a mean difference in probing bone level of -0.86 mm (SD 0.43 mm, p<0.05) was found between test and control implants with the test implants being placed more deeply. Both test and control implants lost a significant amount of clinical bone height during the first 4 months (test 1.16 mm, p<0.05; control 0.58 mm, p<0.05). However, only the test implants significantly lost clinical bone height from 4-12 months (test 1.04 mm, p<0.05; control 0.45 mm, p=0.08). Overall, the test implants lost 2.26 mm and the control implants 1.02 mm of bone height during the first year of service. On the average, the test implants demonstrated a bone level 0.38 mm lower than the controls at 12 months. Except for the modified gingival index at 4 months (mean difference 0.21, SD 0.19, p<0.05), no clinical parameters yielded significant differences between test and control implants at any time. It is concluded that in addition to the crestal bone resorption occurring at implants placed under standard conditions, the bone adjacent to the polished surface of more deeply placed ITI implants is also lost over time. Form a biological point of view, the placement of the border between the rough and the smooth surfaces into a subcrestal location should not be recommended. Copyright © Munksgaard 1996.en_US
dc.languageengen_US
dc.publisherWiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.blackwellpublishing.com/journals/CLRen_US
dc.relation.ispartofClinical Oral Implants Researchen_US
dc.subject.meshAdulten_US
dc.subject.meshAgeden_US
dc.subject.meshAlveolar Bone Loss - Etiology - Radiographyen_US
dc.subject.meshCross-Sectional Studiesen_US
dc.subject.meshDental Implantation, Endosseous - Adverse Effects - Methodsen_US
dc.subject.meshDental Implants - Adverse Effectsen_US
dc.subject.meshDental Plaque Indexen_US
dc.subject.meshDental Prosthesis Designen_US
dc.subject.meshFemaleen_US
dc.subject.meshHumansen_US
dc.subject.meshLongitudinal Studiesen_US
dc.subject.meshMaleen_US
dc.subject.meshMiddle Ageden_US
dc.subject.meshOsseointegrationen_US
dc.subject.meshPatient Care Planningen_US
dc.subject.meshPeriodontal Indexen_US
dc.subject.meshPeriodontium - Pathologyen_US
dc.subject.meshStatistics, Nonparametricen_US
dc.subject.meshWound Healingen_US
dc.titleThe effect of subcrestal placement of the polished surface of ITI® implants on marginal soft and hard tissuesen_US
dc.typeArticleen_US
dc.identifier.emailLang, NP:nplang@hkucc.hku.hken_US
dc.identifier.authorityLang, NP=rp00031en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.pmid9002829-
dc.identifier.scopuseid_2-s2.0-0030155399en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030155399&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume7en_US
dc.identifier.issue4en_US
dc.identifier.spage111en_US
dc.identifier.epage119en_US
dc.identifier.isiWOS:A1996UY55300005-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridHämmerle, CHF=7005331848en_US
dc.identifier.scopusauthoridBrägger, U=7005538598en_US
dc.identifier.scopusauthoridBürgin, W=7003413848en_US
dc.identifier.scopusauthoridLang, NP=7201577367en_US

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