Related Experiment Video
Updated: Jul 15, 2026
06:29
A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
Published on: February 15, 2021
Predicting and preventing root resorption: Part I. Diagnostic factors.
1Department of Orthodontics, DEN 312D, University of Southern California, Los Angeles, CA 90089-0641, USA. sameshim@usc.edu
Summary
Predicting orthodontic root resorption is possible by identifying pretreatment factors. Maxillary anterior teeth, especially lateral incisors, are most affected, with abnormal root shapes increasing risk.
Area of Science:
- Dentistry
- Orthodontics
- Radiology
Background:
- Root resorption is a common complication of orthodontic treatment.
- Identifying predictive factors can help clinicians manage treatment and patient outcomes.
Purpose of the Study:
- To identify pretreatment factors predicting the incidence, location, and severity of apical root resorption.
- To aid clinicians in anticipating root resorption before initiating orthodontic treatment.
Main Methods:
- Retrospective analysis of 868 patients treated with fixed edgewise appliances.
- Assessment of apical root resorption (first molar to first molar, both arches) using full-mouth periapical radiographs.
Main Results:
- Root resorption predominantly affects maxillary anterior teeth (average >1.4 mm).
- Maxillary lateral incisors and teeth with abnormal root shapes (pipette, pointed, dilacerated) showed the most severe resorption.
- Adults had more resorption in the mandibular anterior segment; Asian patients had less resorption than white or Hispanic patients.
- Increased overjet correlated with greater root resorption, but overbite did not. Gender showed no significant difference.
Conclusions:
- Pretreatment factors can predict orthodontic root resorption, particularly in maxillary anterior teeth.
- Abnormal root morphology and increased overjet are significant risk factors for root resorption.
- Patient ethnicity and age influence the incidence and severity of root resorption.
Related Concept Videos
01:30Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy
Various diagnostic tests are employed in the diagnostic process for Inflammatory Bowel Disease (IBD), particularly to differentiate between Crohn's disease and ulcerative colitis.
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the colonic...
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the colonic...
01:25Factors Influencing Drug Absorption: Disease States and Pharmacology
Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
01:17Factors Affecting Renal Clearance: Renal Impairment
Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
01:27Urinary Tract Calculi IV: Nutrition Therapy and Prevention
Management of renal calculi focuses on effective strategies like tailored nutrition and hydration therapy. Adjusting diet and fluid intake reduces stone formation and recurrence, making these interventions simple yet powerful in kidney stone prevention and management.Understanding Kidney StonesKidney stones form when calcium, oxalate, uric acid, and cystine concentrate and crystallize in urine. Factors contributing to their formation include genetic predisposition, certain medical conditions,...
01:30Acute Kidney Injury IV: Diagnostic Studies and Prevention
Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
01:25Chronic Kidney Disease I: Introduction
Chronic Kidney Disease (CKD) arises when the kidneys progressively lose their ability to function, ultimately leading to end-stage renal disease. At this advanced stage, the kidneys can no longer filter waste or maintain essential body functions, requiring renal replacement therapy (RRT) through dialysis or a kidney transplant for survival.Early-stage chronic kidney disease and detection challengesIn CKD's early stages, symptoms often remain absent because healthy nephrons compensate for...