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Online learning page in the field of periodontology, oral implantology, endodontics and aesthetic de

18/10/2026

How does a free gingival graft survive its first two weeks, cut off from its blood supply?

In broad order, and the steps overlap: fluid first, vessels next, surface last. Most of this timeline comes from animal studies and a few small human studies, so treat the day counts as approximate.

Sources on PubMed: Oliver 1968 (PMID 4249992), Mormann 1975 (PMID 1061715), Nobuto 1988 (PMID 3183914), Zaiger 2024 (PMID 38634181).

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17/10/2026

Everyone gets plaque. Not everyone loses teeth.

1965, Aarhus. Twelve volunteers at a dental school stopped brushing. All of them had gingivitis within 10 to 21 days. When they brushed again, the gums were healthy within about a week (Löe, Theilade and Jensen, 1965).

1970 to 1985, Sri Lanka. Löe's team followed 480 young men on two tea plantations, with no oral hygiene and no dental care. All of them had heavy plaque. About 8 in 100 lost attachment fast and had lost all their teeth by 45. About 81 in 100 lost it slowly. About 11 in 100 never went past gingivitis (Löe et al., 1986).

Today, the 2017 classification gives every periodontitis case a grade, A, B or C: how fast the disease is expected to progress.

The honest limit: one study, men only, one setting, and only 161 of the 480 men were examined at the end. The animation is a schematic, not histology, and not to scale.

Clinical takeaway: when you probe a pocket, write down how fast it got there, not only how deep it is.

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16/10/2026

How many dentists does your country have for every 10,000 people?

We mapped the latest WHO report for every country that has one: 189 countries and 2,725,211 dentists. That is about 1 dentist for every 2,900 people on the planet. China reports the most dentists, and India is second.

The spread between countries is wide. 64 countries report fewer than 1 dentist per 10,000 people. 23 countries report 9 or more.

One caution before you compare. Every country counts dentists its own way. Brazil shows it best: its dental council (CFO) counts about 450,000 registered dentists, while the figure Brazil reports to the WHO is 166,443. Read these numbers as estimates, not a census.

Where does your country land? Tell us in the comments.

Data: WHO National Health Workforce Accounts (dentists, number and per 10,000 people), latest report per country, 2017 to 2024. Map: Natural Earth.

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15/10/2026

What happens to the load on an implant when you move the bite 7 mm out onto a cantilever?

Think of a wrench. A longer handle lets the same hand turn a stuck bolt. On an implant bridge, the extension is the handle.

The bending at the implant is the bite force times the lever arm: M = F × d. Twice the lever, twice the bending. With an example bite of 100 N, moving the contact from 3.6 mm to 7.2 mm takes the bending from 360 to 720 N·mm.

The glow in the animation marks the idea at the crest: bone squeezed on the side of the extension, pulled on the other side.

The options follow from the formula: shorten the lever, or put support under it.

The honest limit: this is physics, not a survival study. It tells you the load, not how long a cantilever bridge will last, and outcomes depend on much more than one lever arm. The 3D animation is a schematic illustration, not a finite element model.

Before you design an extension, measure the lever.

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14/10/2026

Open any implant catalogue and every surface promises faster bone. But titanium cannot build a single cell.

1952, Lund. Per-Ingvar Brånemark placed a titanium chamber in a rabbit's leg to study blood flow. Months later, it would not come out. The bone had grown directly onto the metal. He named it osseointegration.

1965, Gothenburg. Gösta Larsson received four implants in his lower jaw. They were still in place and working when he died in 2006, 41 years later.

Today we compare machined, blasted, etched, anodised and hydrophilic surfaces. A surface can change the start: how fast bone arrives. Over the long run, the 2014 Cochrane review found no evidence that any implant type has better long-term success (Esposito et al., 2014).

The honest limit: that review rests on a small number of trials, and the animation is a schematic illustration, not histology.

Clinical takeaway: choose your surface, then give bone what it always asked for. A clean site. No movement. Time.

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13/10/2026

When a patient looks at a front crown, what do they check first: the length, the shade, or the gum line?

One upper central incisor, before and after a new crown.

Before: the old restoration sat longer than the tooth next to it, the shade did not match, and dark spaces showed beside it at the gum line.

After: the new crown matches its neighbour in length and shade, and the soft tissue now fills most of the space between the teeth.

The original post did not record the materials or the time between the two photos, so we will not guess them here. For a single front tooth, the patient judges the result against the tooth next door, in the mirror.

Sometimes we reach the goal: a happy patient and a happy dentist.

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12/10/2026

A molar socket is not one big empty hole. Where will your immediate implant find its stability?

The interradicular septum can decide that. Smith and Tarnow (2013) describe three molar extraction sites:

A: the implant fits entirely within septal bone.
B: septal bone stabilizes the implant but does not surround it; gaps remain.
C: little or no septal bone, so stability has to come from the socket periphery.

The letters describe anatomy around the planned implant. They are not success grades, and type B or C does not automatically mean the facial wall is missing.

Classify the site, then check the rest of the case: socket-wall integrity, safe available bone, restorative position and loading strategy. Immediate placement is not the same as immediate loading. If the only way to gain stability compromises the restorative plan, reconsider the approach.

Reference: Smith RB, Tarnow DP. Classification of molar extraction sites for immediate dental implant placement: technical note. Int J Oral Maxillofac Implants. 2013;28:911-916.

Carousel by . AI-generated educational illustrations, shown schematically, not patient cases or a surgical protocol.

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11/10/2026

Five years after loading, what do you check first in a full-arch implant case?

This case from the Periospot archive shows a maxillary full-arch rehabilitation at its 5-year follow-up, with the prosthesis removed. Occlusal view on top, frontal view below. Full-arch digital impressions were taken with an intraoral scanner.

What this photo lets you look at:
• The soft tissue around each implant platform
• The emergence profiles the prosthesis shaped over five years
• The tissue between the implants, where the pontic areas sit

One case is one case. It shows what this patient looked like at five years, not what every full-arch protocol will give.

What would you check next: probing, bleeding, or the radiographs?

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10/10/2026

Covering a recession on a tooth is one problem. Covering a recession on an implant is a harder one.

This case from 2017 shows why. The implant crown had a buccal soft tissue dehiscence, with the implant collar showing through the mucosa. A soft tissue graft was harvested, placed over the defect and sutured.

The contour improved, but the recession was not fully covered.

An implant has no periodontal ligament and no root surface for the tissue to attach to, so a graft over it depends on blood supply from its edges. Partial coverage is a common outcome. Many of these defects are easier to prevent at placement than to fix later: implant position, buccal bone and soft tissue thickness all count on day one.

Have you fully covered a peri-implant recession? What made the difference?

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09/10/2026

How do you explain periodontal disease to a patient without losing them in the jargon?

Dr Chris Millen (.specialist) sent us one sentence:

"what is periodontal disease, including its risk factors, how we recognise and treat it and the sequelae of not treating it"

That sentence became the brief for this patient explainer. Chris also gave us clinical feedback on the probe, the scaler and the ending, and the video changed because of it.

Thank you, Chris, for the sentence and the feedback.

This is a general educational illustration. It does not replace an individual assessment or treatment plan.

Save it for your next patient conversation, or share it with a colleague who explains this every day.

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