Introduction to Animal Models of Mandibular Defects

The mandibular defect animal model serves as a core in vivo platform for research on oral and maxillofacial bone regeneration, tissue-engineered scaffold materials, and minimally invasive repair techniques. It commonly employs rats, rabbits, or small pigs, in which a specific segment of the mandibular body or ramus is surgically resected to create a critical-sized bone defect—defined as a permanent defect that fails to heal spontaneously. This model closely mimics the extensive bone loss observed clinically due to mandibular tumor resection, severe trauma, or congenital malformations, while accurately replicating the complex biomechanical environment of the oral cavity. As such, it is an industry‑recognized tool for evaluating the osteogenic efficacy, vascularization and remodeling, and osseointegration capabilities of bioactive materials, including 3D‑printed bone scaffolds and growth factor carriers.

Service Advantages of Aniphe BioLab’s Mandibular Defect Animal Model Platform

Aniphe BioLab’s animal model platform for mandibular defects is dedicated to research in oral and maxillofacial bone regeneration and tissue engineering. It has established a standardized system for constructing and evaluating mandibular defect models, offering clients end-to-end research services—from model development to endpoint assessment.

	The modeling protocol is well-established. Supports multiple modeling approaches, including mandibular angle bone defects, critical-sized bone defects, and segmental bone defects.
	The model is stable and reliable. Standardized surgical procedures ensure precise and controllable defect localization, with excellent model reproducibility and batch-to-batch consistency.
	Multidimensional evaluation system It encompasses evaluation metrics such as micro-CT, X-ray, histopathology, and bone histomorphometry.
	Enhanced testing platform HE staining, Masson’s trichrome staining, IHC, IF, and assays for bone‑formation–related molecules can be performed.
	End-to-end QA management Strictly adhere to SOPs and the quality management system to ensure that experimental procedures are standardized, data are accurate and complete, and traceability is maintained.
	Customized Research Services The defect size, implant material, observation period, and endpoint evaluation protocol can be tailored to the specific requirements of the study.

Modeling cycle	4–16 weeks
Laboratory animals	SD/Wistar rats, New Zealand rabbits
Positive drug	Autologous bone grafts are typically used as the gold standard for comparison; commonly employed positive‑control agents include recombinant human bone morphogenetic protein‑2 (rhBMP‑2), parathyroid hormone (PTH 1‑34), platelet‑rich plasma (PRP), and bone marrow–derived mesenchymal stem cells combined with scaffolds. In drug‑evaluation studies, bisphosphonates (such as zoledronic acid) and statins may also serve as control treatments.
Application areas	It is primarily used in oral and maxillofacial surgery, tissue engineering, and biomaterials, where it can serve as a scaffold for various bone‑repair applications, drug‑delivery systems, and platforms for evaluating the in vivo osteogenic efficacy and biocompatibility of stem cells and osteogenic growth factors. Additionally, it supports the optimization of surgical procedures such as implant‑site augmentation, guided bone regeneration (GBR), and distraction osteogenesis.

Construction of an Animal Model of Mandibular Defect

The mandibular defect model—characterized by the excision of a 4 × 5 mm rectangular bone block from the mandibular angle region—is a widely used experimental model in oral and maxillofacial bone tissue engineering and bone regeneration research. During model preparation, under anesthesia, the mandibular angle area of the experimental animal is exposed, and a full-thickness rectangular bone segment measuring approximately 4 × 5 mm is removed using a dental high-speed bur, a micro‑osteotome, or orthopedic surgical instruments, thereby creating a standardized bone defect while preserving as much as possible the surrounding vital vessels, nerves, and soft tissues. This defect size typically reaches or approaches the critical-sized defect threshold, making it difficult for the body to achieve complete self‑repair; thus, it reliably mimics the clinical conditions of mandibular defects resulting from trauma, tumor resection, or infection.