Universidad Santo Tomás, Facultad de Odontología, Bucaramanga, Colombia.
Acta Odontol Latinoam. 2022 Dec 31;35(3):171-177. doi: 10.54589/aol.35/3/171.
Orthodontic appliances promote the accumulation of biofilm in the oral cavity and increase counts of Streptococcus mutans (S. mutans). However, there are few comparative studies of the effects generated by the interaction of saliva and microorganisms in absence and presence of orthodontic appliances.
The aim of this study was to determine the S. mutans colony-forming unit count (CFU/mL) in participants with and without fixed orthodontic appliances.
It was an observational cross-sectional study on 21 participants, all over 18 years of age, non-smokers, without removable oral appliances, who had not been under antibiotic treatment within the previous three months. Sociodemographic variables, oral hygiene habits, S. mutans CFU/mL count, and salivary pH were assessed. Saliva samples were collected, and the data was analyzed using Fisher's exact and Kruskal Wallis tests. A p-value <0.05 was considered statistically significant.
Fourteen (66.7%) of the participants were female; average age was 20.4 ± 2.2 years. The group without fixed orthodontic appliances had the highest salivary S. mutans CFU/mL count (Me: 56.0×103, IQR: 9.2×103 - 75.5×103), but there was no statistically significant difference between groups (p=0.7459). There was a statistically significant difference in salivary pH, with the metal orthodontic appliance group having the lowest pH (p=0.0478). No statistically significant difference in salivary S. mutans CFU/mL count was found between groups. Salivary pH was lower in the group with metal appliances than in the groups with non-metal appliances and without appliances.
本研究旨在确定佩戴和不佩戴固定正畸矫治器的患者中变形链球菌（S. mutans）的菌落形成单位计数（CFU/mL）。
这是一项观察性的横断面研究，共纳入 21 名年龄均在 18 岁以上、不吸烟、无可摘戴口腔矫治器、且在过去三个月内未接受抗生素治疗的参与者。评估了社会人口学变量、口腔卫生习惯、S. mutans CFU/mL 计数和唾液 pH 值。收集唾液样本，并使用 Fisher 确切检验和 Kruskal Wallis 检验对数据进行分析。p 值<0.05 被认为具有统计学意义。
14 名（66.7%）参与者为女性；平均年龄为 20.4±2.2 岁。不佩戴固定正畸矫治器的组唾液中变形链球菌 CFU/mL 计数最高（中位数：56.0×103，IQR：9.2×103-75.5×103），但两组间无统计学差异（p=0.7459）。唾液 pH 值存在统计学差异，金属正畸矫治器组的 pH 值最低（p=0.0478）。各组间唾液变形链球菌 CFU/mL 计数无统计学差异。金属矫治器组的唾液 pH 值低于无矫治器组和无金属矫治器组。
