Soft and hard tissue histologic dimensions around dental implants in the canine restored with smaller-diameter abutments: a paradigm shift in peri-implant biology

Cochran, David L.; Mau, Lian Ping; Higginbottom, Frank L.; Wilson, Thomas G.; Bosshardt, Dieter D.; Schoolfield, John; Jones, Archie A. (2013). Soft and hard tissue histologic dimensions around dental implants in the canine restored with smaller-diameter abutments: a paradigm shift in peri-implant biology. International journal of oral & maxillofacial implants, 28(2), pp. 494-502. Quintessence Publ. 10.11607/jomi.3081

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PURPOSE To evaluate the biologic width dimensions around implants with nonmatching implant-abutment diameters. MATERIALS AND METHODS Five canines had their mandibular premolars and first molars removed bilaterally and replaced with 12 implants that had nonmatching implant-abutment diameters. On one side, six implants were placed in a submerged surgical approach, and the other side utilized a nonsubmerged approach. Two of the implants on each side were placed either 1 mm above, even with, or 1 mm below the alveolar crest. Two months later, gold crowns were attached, and the dogs were sacrificed 6 months postloading. Block sections were processed for histologic and histomorphometric analyses. RESULTS The bone level, connective tissue length, epithelial dimension, and biologic width were not significantly different when the implants were initially placed in a submerged or nonsubmerged surgical approach. The bone level was significantly different around implants placed 1 mm above the crest compared to implants placed even with or 1 mm below the alveolar crest. The connective tissue dimension was not different for any implant level placement. The epithelial dimension and biologic width were significantly greater for implants placed 1 mm below the alveolar crest compared to implants placed even with or 1 mm above the alveolar crest. For five of six implant placements, connective tissue covered the implant/abutment interface. CONCLUSIONS This study reveals a fundamental change in the biologic response to implants with nonmatching implant-abutment diameters. Unlike implants with matching implant-abutment diameters, the connective tissue extended coronally past the interface (microgap). This morphologic tissue alteration represents a significant change in the biologic reaction to implant-abutment interfaces and suggests that marginal inflammation is eliminated or greatly reduced in these implant designs.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Periodontology
04 Faculty of Medicine > School of Dental Medicine > Department of Oral Surgery and Stomatology

UniBE Contributor:

Bosshardt, Dieter

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0882-2786

Publisher:

Quintessence Publ.

Language:

English

Submitter:

Eveline Carmen Schuler

Date Deposited:

03 Mar 2014 16:22

Last Modified:

25 Jan 2017 12:15

Publisher DOI:

10.11607/jomi.3081

PubMed ID:

23527352

Uncontrolled Keywords:

Animal study, biologic width, dental implant-abutment interface, endosseous dental implant, platform switching

BORIS DOI:

10.7892/boris.40408

URI:

https://boris.unibe.ch/id/eprint/40408

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