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Regression Toward the Mean01:52

Regression Toward the Mean

Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when researchers try to extrapolate results...

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From Break-Even Point to Dynamic Regenerative Balance: A Conceptual and Quantitative Framework Based on Preclinical

Daniele Botticelli1,2, Karol Alí Apaza Alccayhuaman2,3, Samuel Porfirio Xavier4

  • 1Department of Oral Implantology, School of Dentistry, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata 573-1121, Osaka, Japan.

Dentistry Journal
|October 28, 2025
PubMed
Summary
This summary is machine-generated.

The break-even point effectively measures the balance between new bone formation and graft resorption, offering dynamic insights beyond static bone-to-implant contact percentage. This method reveals varying regenerative kinetics among different bone graft materials.

Keywords:
Dynamic Regenerative Balancebiomaterialsbone regenerationbone resorptionbreak-even pointhistomorphometryosseointegrationsinus augmentation

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Oral and Maxillofacial Surgery

Background:

  • Traditional static parameters like bone-to-implant contact percentage (BIC%) fail to capture the dynamic nature of bone regeneration.
  • The concept of Dynamic Regenerative Balance (DRB) was introduced to assess the equilibrium between bone formation and graft resorption.
  • The break-even point is proposed as a measurable approximation of this dynamic equilibrium in bone regeneration.

Purpose of the Study:

  • To illustrate the utility of the break-even point in quantifying the balance between graft resorption and new bone formation.
  • To compare the regenerative kinetics and resorption profiles of various bone graft biomaterials using the break-even point.
  • To establish the break-even point as a valuable complement to conventional histomorphometric measures in preclinical studies.

Main Methods:

  • Analysis of four preclinical studies involving sinus floor elevation in rabbits.
  • Histomorphometric data on new bone formation and graft resorption were collected at multiple time points.
  • The break-even point was calculated via linear extrapolation, representing the time when new bone formation equals residual graft percentage.

Main Results:

  • Significant variations in the break-even point were observed across six analyzed biomaterials (autogenous bone, Bio-Oss®, Bio-Oss Collagen®, Gen-Os®, Maxresorb®, Maxresorb® Inject).
  • Autogenous bone demonstrated the fastest equilibrium (18.4 days/13.5%), followed by Gen-Os® (40.4 d/19.1%).
  • Other materials showed longer times to equilibrium, with Bio-Oss® not reaching it within six months in one study, indicating distinct regenerative dynamics.

Conclusions:

  • The break-even point provides a simple, informative parameter for assessing the dynamic balance between graft resorption and new bone formation.
  • This parameter complements traditional histomorphometric measures and offers a framework for future research on bone regeneration.
  • The findings highlight the differential regenerative kinetics and resorption characteristics of various biomaterials.