Study: NCT05334407

Intervention type: PROCEDURE
Group type: EXPERIMENTAL
Intervention: Implant-supported full-arch fixed dental prostheses（dental intervention,DE）
Description: Implant-supported full-arch fixed dental prostheses in at least one jaw and appropriate treatment in the opposing jaw regarding periodontal diseases, caries, replacement of missing teeth and soft tissue disorders to get at least 10 pairs of occluding teeth. The intervention is designed to provide rehabilitation of masticatory function.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Implant-supported full-arch fixed dental prostheses（dental intervention,DE）
Description: Implant-supported full-arch fixed dental prostheses in at least one jaw and appropriate treatment in the opposing jaw regarding periodontal diseases, caries, replacement of missing teeth and soft tissue disorders to get at least 10 pairs of occluding teeth. The intervention is designed to provide rehabilitation of masticatory function.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Dietary intervention tailored to the dental status (dietary intervention, DI)
Description: Dietary intervention based on the health Belief Model (HBM) with the behavioral goal of increasing an individual's likelihood of food intake regarding fresh vegetables, fresh fruits, and high quality protein for the potential intervention strategies.~Participants will receive 20 minutes' coordinated dietary advice in the form of the slideshow presentation . A pamphlet prepared with reference to the Supplementary Guidelines for Elderly Populations, the 4th edition of the Dietary Guidelines for Chinese will be given to the participant separately. If a participant does not prepare his or her own meals, the person who does the cooking receives the dietary advice as well.

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: Dietary intervention tailored to the dental status (dietary intervention, DI)
Description: Dietary intervention based on the health Belief Model (HBM) with the behavioral goal of increasing an individual's likelihood of food intake regarding fresh vegetables, fresh fruits, and high quality protein for the potential intervention strategies.~Participants will receive 20 minutes' coordinated dietary advice in the form of the slideshow presentation . A pamphlet prepared with reference to the Supplementary Guidelines for Elderly Populations, the 4th edition of the Dietary Guidelines for Chinese will be given to the participant separately. If a participant does not prepare his or her own meals, the person who does the cooking receives the dietary advice as well.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Delayed implant-supported full-arch fixed dental prostheses（dental intervention,DE）
Description: Delayed (4 months) implant-supported full-arch fixed dental prostheses in at least one jaw and appropriate treatment in the opposing jaw regarding periodontal diseases, caries, replacement of missing teeth and soft tissue disorders to get at least 10 pairs of occluding teeth. The intervention is designed to provide rehabilitation of masticatory function.

Intervention type: PROCEDURE
Group type: PLACEBO_COMPARATOR
Intervention: Delayed implant-supported full-arch fixed dental prostheses（dental intervention,DE）
Description: Delayed (4 months) implant-supported full-arch fixed dental prostheses in at least one jaw and appropriate treatment in the opposing jaw regarding periodontal diseases, caries, replacement of missing teeth and soft tissue disorders to get at least 10 pairs of occluding teeth. The intervention is designed to provide rehabilitation of masticatory function.

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: Delayed dietary intervention tailored to the dental status (dietary intervention, DI)
Description: Dietary intervention based on the health Belief Model (HBM) with the behavioral goal of increasing an individual's likelihood of food intake regarding fresh vegetables, fresh fruits, and high quality protein for the potential intervention strategies.~Participants will receive 20 minutes' coordinated dietary advice in the form of the slideshow presentation . A pamphlet prepared with reference to the Supplementary Guidelines for Elderly Populations, the 4th edition of the Dietary Guidelines for Chinese will be given to the participant separately. If a participant does not prepare his or her own meals, the person who does the cooking receives the dietary advice as well.

Intervention type: BEHAVIORAL
Group type: PLACEBO_COMPARATOR
Intervention: Delayed dietary intervention tailored to the dental status (dietary intervention, DI)
Description: Dietary intervention based on the health Belief Model (HBM) with the behavioral goal of increasing an individual's likelihood of food intake regarding fresh vegetables, fresh fruits, and high quality protein for the potential intervention strategies.~Participants will receive 20 minutes' coordinated dietary advice in the form of the slideshow presentation . A pamphlet prepared with reference to the Supplementary Guidelines for Elderly Populations, the 4th edition of the Dietary Guidelines for Chinese will be given to the participant separately. If a participant does not prepare his or her own meals, the person who does the cooking receives the dietary advice as well.