Tissue response at the bone-implant interface in a hydroxylapatite augmented mandibular ridge

Page, Dennis G.; Laskin, Daniel M.

doi:10.1016/0278-2391(87)90360-0

Cited by 25 publications

(17 citation statements)

References 10 publications

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“…Studies of porous HA implants on the alveolar ridges of dogs [7] and human maxillary alveolus [8] demonstrated bone ingrowth into the open pores on the surface of the implants. Similar studies in dogs [9,10] and biopsy specimens from humans [11,12] showed that dense HA implants became surrounded by mature fibrous tissue, with a variable amount of new bone formation. However, HA implants often developed cracks [6,10].…”

Section: Introductionmentioning

confidence: 58%

Sintering behaviour and mechanical properties of hydroxyapatite and dicalcium phosphate

Wang

Chaki

1993

J Mater Sci: Mater Med

234

134

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The sintering behaviour of powders of two calcium phosphates, namely hydroxyapatite (HA) and dicalcium phosphate (DCP), were studied at various temperatures and in various environments. The density, flexural strength and Knoop hardness of HA sintered in air for 4 h initially increased with the sintering temperature, reaching maxima at around 1150°C, and then decreased due to decomposition of HA into tri-(TCP) and tetracalcium phosphates. Sintering in vacuum caused decomposition of HA at lower temperatures, and consequently the mechanical properties were poorer than those of HA sintered in air. The densification and mechanical properties of DCP sintered in air and vacuum showed similar behaviour to those of HA. In air DCP underwent phase transformation from 7-to [3-and to 0~-phases. In vacuum DCP started to decompose into tricalcium phosphate at 1000°C. To reduce dehydroxylation, HA powder was sintered in moisture at various temperatures up to 1350°C and X-ray diffraction study did not indicate any decomposition at the highest sintering temperature. The density, flexural strength and hardness of HA sintered in moisture increased with the sintering temperature and eventually reached plateaux at about 1300°C, but below 1200°C they were lower than those of HA sintered in air at corresponding temperatures. Thus, it is seen that dehydroxylation did not hinder sintering of HA. On the other hand, decomposition obstructed sintering of both HA and DCP.

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Section: Introductionmentioning

confidence: 58%

Sintering behaviour and mechanical properties of hydroxyapatite and dicalcium phosphate

Wang

Chaki

1993

J Mater Sci: Mater Med

234

134

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“…Hydroxyapatite (HAP) is used in orthopaedic [4,5] and odontological surgery for wadding [5] or surface covering [6]. Their mechanical properties are low [6][7][8] and sometimes several materials are used in the production of prosthesis: metallic alloys + hydroxyapatite film + alumina + polyethylene [9]. Substitutions of the calcium ions (from the HAP) have been made by metal ions [10,11] such as, for instance, silicon, magnesium [12], lead [13], titanium and zirconium [14] with the purpose of improving the hydroxyapatite properties.…”

Section: Introductionmentioning

confidence: 99%

Microwave preparation, structure and electrical properties of calcium–sodium–phosphate biosystem

Silva

Graça

Góes

et al. 2006

Journal of Non-Crystalline Solids

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“…Studies of porous HA implants on dogs' alveolar ridges [11] and human maxillary alveolus [12] demonstrated bone ingrowth into the open pores on the surface of the implants. On the other hand, studies in dogs [13,14] and biopsy specimens from humans [15,16] showed that dense HA implants became surrounded by mature fibrous tissue, with a variable amount of new bone formation. However, HA implants often developed cracks [10,14].…”

Section: Introductionmentioning

confidence: 99%

Densification and strengthening of silver-reinforced hydroxyapatite-matrix composite prepared by sintering

Chaki

Wang

1994

J Mater Sci: Mater Med

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Ductile-phase reinforcement of hydroxyapatite (HA) was achieved by addition of silver particulates (5-30 vol %) in HA powder and subsequent sintering of HA-Ag powder compacts. A composite made by sintering 10 vol% Ag and the balance HA at 1200°C for 1 h in air had flexural strength of 75 4-7 MPa, which was almost double that of pure HA sintered under an identical condition. The density of HA-10 vol% Ag composite was 90 -t-2% of the theoretical density (as calculated from the rule of mixture) and was lower than that (98.7 ___ 0.4%) of pure HA sintered at a similar condition. The X-ray diffraction pattern of the composite did not indicate any decomposition of HA or any reaction between HA and Ag. Ag in the composite melted during sintering, but, due to poor wetting, did not spread in between HA particles. The addition of Ag reduced densification and grain growth during sintering of HA-Ag composites. Indentation cracks in the composites went around Ag inclusions and often stopped at Ag inclusions. The increase in the flexural strength of the composites was thought to be due to crack-bridging and crack-arrest by silver particles.

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Tissue response at the bone-implant interface in a hydroxylapatite augmented mandibular ridge

Cited by 25 publications

References 10 publications

Sintering behaviour and mechanical properties of hydroxyapatite and dicalcium phosphate

Sintering behaviour and mechanical properties of hydroxyapatite and dicalcium phosphate

Microwave preparation, structure and electrical properties of calcium–sodium–phosphate biosystem

Densification and strengthening of silver-reinforced hydroxyapatite-matrix composite prepared by sintering

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