Bone Grafts for Dental Implants: When They Are Needed, Types of Graft Material, and How Sinus Lifts Differ

Do I have to get a bone graft, or can I skip it?

If the width and height of the remaining alveolar bone are enough to support the fixture securely, a bone graft is not needed; it is added only when bone is lacking [1]. Typical situations that call for a bone graft are as follows [1].

• When a long time has passed since extraction and the alveolar bone has been resorbed
• When periodontitis has caused bone loss
• When the upper back teeth area is close to the maxillary sinus

DentStat analyzed 1,743 patient comments on bone grafts. The most common question was whether it is really necessary, and confusion because each clinic gave a different diagnosis came up repeatedly [4]. Depending on the treatment plan, including the position, angle, and timing of placement, the judgment can differ even with the same bone volume, so having the reason explained with your diagnostic images is the standard for deciding [1]. Bone grafts and sinus lifts are non-covered items, not included in National Health Insurance coverage [2].

Are bone grafts, sinus lifts, and alveolar bone grafts all the same?

No. They are separate procedures with different purposes and sites, and the names are often used interchangeably, which causes a lot of confusion [3]. The comment analysis also found many questions treating the three terms as the same procedure [4].

Procedure	Site and purpose
Guided bone regeneration (GBR)	Locally reinforces insufficient bone around the implant site with graft material and a barrier membrane [3]
Sinus lift	In the upper back teeth area, lifts the sinus membrane and grafts bone into the space created [3]
Alveolar (block) bone graft	Grafts a block of bone into an area with a large defect to restore volume [3]

Sinus lifts are divided into an approach from the gum side and an approach from the side wall, depending on how much bone height is needed [3].

What types of graft material (artificial bone) are there, and how do they differ?

By source, they fall into four types: autograft, allograft, xenograft, and synthetic bone [3].

Type	Source	Characteristics
Autograft	Your own bone	Can form bone, but requires an additional harvest site [3]
Allograft	Processed donated human tissue	Supplied under set processing and control standards [3]
Xenograft	Mineral component of animal-derived bone	Serves as a scaffold for new bone to grow on [3]
Synthetic bone	Synthetic materials	Uses no human or animal tissue [3]

Many comments expressed worry that the graft material would eventually dissolve [4]. Depending on the type, part of the graft material is resorbed and replaced by new bone, and this resorption can be part of the healing process, so resorption alone does not mean failure [3]. Judging individual progress is based on imaging and should be discussed with a dentist.

Can I have a bone graft and an implant right after extraction?

Some cases allow it and others require waiting [1]. In some cases, placement and grafting can be done right after extraction, but if there was an infection or the bone defect is large, treatment proceeds in stages after the extraction site heals [1]. Adding a bone graft can lengthen the wait for osseointegration, which also affects the overall treatment time [1].

Common myths and facts

Some say that bone fills back in on its own if you leave an extraction site alone, but separate from the inside of the socket healing, the overall volume of the alveolar bone tends to shrink over time [1]. Some also worry that clinics recommending bone grafts should be avoided, but whether one is needed has an objective basis, the bone volume seen on imaging, so you can verify it by asking for an explanation of the remaining bone volume and the extent of grafting and by checking the diagnostic records [1]. Many cases were also observed of patients comparing diagnostic records from several clinics when diagnoses differed [4].

You can find the cost breakdown and insurance criteria for implants in general in the dental implant guide, and dental clinics by region in find a dentist.