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Effect of microthreads on coronal bone healing of narrow‐diameter implants with reverse‐tapered design in beagle dogs
Author(s) -
Chang YunYoung,
Kim SuHwan,
Park KeunOh,
Yun JeongHo
Publication year - 2017
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/clr.13022
Subject(s) - coronal plane , implant stability quotient , implant , resonance frequency analysis , dentistry , beagle , medicine , osseointegration , dental implant , orthodontics , surgery , anatomy
Objectives The objective of this study was to investigate the effect of microthreads on the coronal bone healing of narrow‐diameter implants with reverse‐tapered design. Material and Methods A total of 52 implants were classified into two groups according to presence or absence of coronal microthreads, the reverse‐tapered narrow‐diameter implant ( RTN ) group, and the reverse‐tapered narrow‐diameter implant with microthreads ( RTNM ) group. The implants were installed in split‐mouth design in the edentulous mandible of six dogs. Three animals were sacrificed at 4 weeks and three at 8 weeks. Resonance frequency analysis, bone measurement using microcomputed tomography (micro‐ CT ), removal torque test, and histometric analysis were performed. Results No significant differences in implant stability quotient value were observed between the groups at baseline, 4 weeks, or 8 weeks. Bone measurement using micro‐ CT showed that bone–implant contact volume ( BICV ) and bone–implant contact volume ratio ( BICVR ) in the coronal part of RTNM were statistically higher than those in RTN at 4 and 8 weeks. Histometric analysis showed statistically higher bone–implant contact length ( BICL ) in the coronal part of RTNM than in RTN at 4 weeks; however, bone–implant contact ratio ( BICR ) was not significantly different between the groups. At 8 weeks, the BICL and BICR did not differ significantly between the groups. Removal torque test showed no significant differences between the groups at 4 and 8 weeks. Conclusions The microthreads might facilitate more coronal bone–implant contact due to increased surface areas at an early healing phase; however, they did not significantly affect coronal bone healing at 8 weeks.