Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, Universiti Malaya, Kuala Lumpur, Malaysia.
Department of Oral and Craniofacial Sciences, Faculty of Dentistry, Universiti Malaya, Kuala Lumpur, Malaysia.
Clin Oral Investig. 2023 Jun;27(6):3245-3259. doi: 10.1007/s00784-023-04940-4. Epub 2023 Mar 22.
This single center parallel, randomized controlled trial aimed to determine the propensity of microbial adherence on vacuum-formed retainers (VFRs) with different surface roughness imprints.
Thirty-six patients debonded from fixed appliances at a teaching institution were allocated by block randomization stratified for gender to three groups [VFRs fabricated on conventional, fused deposition modeling (FDM) or stereolithography apparatus (SLA) working models]. Participants wore the VFRs for three months full-time followed by three months part-time. VFRs were collected after each follow-up for Streptococcus and yeast counts. Surface roughness was measured indirectly on the working models using a 3D optical surface texture analyzer. Blinding was not feasible due to appliance appearance. The trial was registered [NCT03844425 ( ClinicalTrials.gov )] and funded by the Universiti Malaya Dental Postgraduate Research Grant (DPRG/14/19).
Thirty participants (eleven conventional, ten FDM, and nine SLA) were analyzed after six dropped out. No harms were reported. Microbial counts between the groups were not significantly different. There were more microbes in the lower VFRs than upper VFRs (total count: p<0.05; effect size, 0.5 during full-time wear and 0.4 during part-time wear). SLA had significantly (p<0.05) smoother surface than FDM (effect size, 0.3) and conventional models (effect size, 0.5). Microbial adherence was not associated with working model surface roughness.
Microbial adherence on VFRs was not influenced by degree of surface roughness imprints from working models.
3D printed models can be used to make VFRs. Lower VFRs tended to accumulate oral microbes, potentially increasing the oral health risk in the lower arch.
本单中心平行随机对照试验旨在确定不同表面粗糙度印记对真空成型保持器（VFR）微生物附着倾向的影响。
在一所教学机构中，36 名从固定矫治器上拆除的患者通过区组随机化分层按性别分为三组[常规、熔融沉积建模（FDM）或立体光固化成型（SLA）工作模型制作的 VFR]。参与者全天佩戴 VFR 三个月，然后兼职佩戴三个月。每次随访后收集 VFR 以进行链球菌和酵母计数。使用三维光学表面纹理分析仪间接测量工作模型的表面粗糙度。由于器械外观，无法进行盲法。该试验在 ClinicalTrials.gov 上注册（NCT03844425），并由马来亚大学牙科研究生研究基金（DPRG/14/19）资助。
六名参与者退出后，对 30 名参与者（11 名常规、10 名 FDM 和 9 名 SLA）进行了分析。未报告任何伤害。各组之间的微生物计数没有显著差异。下 VFR 的微生物数量多于上 VFR（总计数：p<0.05；在全天佩戴时的效应量为 0.5，在兼职佩戴时的效应量为 0.4）。SLA 的表面粗糙度明显（p<0.05）低于 FDM（效应量为 0.3）和常规模型（效应量为 0.5）。微生物附着与工作模型表面粗糙度无关。
VFR 上的微生物附着不受工作模型表面粗糙度印记程度的影响。
3D 打印模型可用于制作 VFR。下 VFR 往往会积聚口腔微生物，可能会增加下牙弓的口腔健康风险。
