N-MID, P1NP, β-CTX, and phosphorus in adolescents with condylar resorption

Abstract

Condylar resorption (CR) is a temporomandibular joint disease that causes various physical or functional defects. We aimed to find the association between CR and bone metabolism levels. In this study, we recruited patients visiting the Orthodontic Clinic at Shanghai Ninth People's Hospital from January 2020 to September 2021. Patient characteristics, magnetic resonance imaging examination results, bone mineral density (BMD), Z-score, bone turnover markers, minerals, and hormones were collected and analyzed. The 89 participants were divided into CR (n=46) and normal (n=43) groups. Univariate logistic regression showed that N-terminal mid-fragment of osteocalcin (N-MID), procollagen type 1 N-terminal propeptide (P1NP), β-C-terminal telopeptide of type 1 collagen (β-CTX), and phosphorus (P < .001 for all) were protective factors, and BMD (P=.047) was a risk factor for CR. Multivariable logistic regression showed that N-MID, P1NP, β-CTX, and phosphorus (odds ratio <1, P < .05 for all) were protective factors for CR. Receiver operating characteristic curves showed these indicators to effectively predict CR occurrence (area under the curve >0.7; P < .001). Adolescents with low serum N-MID, P1NP, β-CTX, and phosphorus levels were associated with a higher risk of CR. We suggest that these indicators can guide clinicians in the early detection and prevention of CR in adolescents.