Comparison of temporary anchorage devices and transpalatal arch-mediated anchorage reinforcement during canine retraction

Optimizing orthodontic anchorage: comparative evaluation of larger diameter, shorter length mini-implants for enhanced mechanical stability

AIM

We aim to assess and contrast the mechanical stability of two mini-implant designs, featuring larger diameters and shorter lengths, for orthodontic anchorage against a conventional group of implants.

How Effective Are the Nance Appliance and Transpalatal Arch at Reinforcing Anchorage in Extraction Cases?

OBJECTIVE

This narrative review aimed to evaluate, based on current evidence, whether the transpalatal arch (TPA) and Nance appliance can effectively reinforce anchorage during fixed orthodontic treatment while also offering a comprehensive and in-depth overview of the existing literature on this subject.

MATERIALS AND METHODS

A thorough literature search was performed across multiple electronic databases to identify peer-reviewed articles relevant to the review.

RESULTS

Evidence suggests that the Nance appliance does not provide absolute anchorage. Additionally, patients experienced discomfort and inflammation of the palatal tissues. The transpalatal arch is also insufficient for maximum anteroposterior anchorage, and existing studies on its effectiveness in vertical anchorage control are inconsistent with conflicting data.

CONCLUSIONS

For patients with critical anchorage demand, mini-screws may be the method of choice, either solely or in combination with Nance or transpalatal arch, though they carry a risk of failure.

Evaluation of injectable platelet-rich fibrin effect on the rate of canine retraction and alkaline phosphatase levels: An in-vivo study

INTRODUCTION

With time, the treatment protocol has changed, and currently, there is a new school of treatment called accelerated orthodontics, wherein the goal is to shorten the time. In this study, a liquid formulation of platelet-rich fibrin such as injectable platelet-rich fibrin (i-PRF), was used, and its effect on the rate of canine retraction and the crevicular alkaline phosphatase (ALP) levels were studied.

METHODS

Thirteen patients were recruited for this study with a mean age of 20.6 ± 3.2 years. A split-mouth type of study design was used in which the maxillary arch of each subject was divided into an experimental and control group. I-PRF was injected in the labial and lingual attached gingiva of the canine in the experimental group. The gingival crevicular fluid collection was done from the distal aspect of the canine before canine retraction, 24 hours after retraction, and 28 days after retraction from both sites (ie, control and experimental sites). ALP activity was analyzed using a semiautomated analyzer, and the rate of canine retraction was measured on stone casts with the help of a digital vernier caliper.

RESULTS

The individual canine retraction was 1.8-fold faster in the i-PRF group than in the control group. The ALP activity was significantly greater at 24 hrs and 28 days after retraction in the experimental group.

CONCLUSIONS

These results suggest that i-PRF is an innovative, noninvasive approach to accelerating tooth movement. ALP activity in gingival crevicular fluid reflects the biological changes in the periodontium, and the steep increase in the activity indicates increased bone remodeling within the experimental group.

ADDING TEMPORARY ANCHORAGE DEVICES (TADs) TO THE FORSUS™ CLASS II CORRECTION SYSTEM MAY NOT ENHANCE THE SAGITTAL SKELETAL EFFECTS BUT MAY CONTROL THE INCLINATION OF THE MANDIBULAR INCISORS

ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION

A comparison of the effects of Forsus appliances with and without temporary anchorage devices for skeletal Class II malocclusion. Liu L, Zhan Q, Zhou J, Kuang Q, Yan X, Zhang X, Shan Y, Lai W, Long H. Angle Orthod. 2020 Dec 30. doi:10.2319/051120-421.1. Epub ahead of print. PMID: 33378419.

SOURCE OF FUNDING

National Natural Science Foundation of China (No. 82,071,147, 81,571,004, and 81,500,884).

TYPE OF STUDY/DESIGN

Systematic review with meta-analysis.

The effect of toothpastes with bleaching agents on the force decay of elastomeric orthodontic chains

Objective:

The aim of this study was to evaluate the effect of agents available in whitening toothpastes (Crest^® and Sensodyne^®) in vitro on the force decay of elastomeric chains used in orthodontics.

Materials and Methods:

A total of 300 specimens of elastomeric chains were divided into five groups (n = 60) and were evaluated. These groups included (1) the regular Crest® toothpaste and distilled water solution, (2) whitening Crest^® toothpaste and distilled water solution, (3) regular Sensodyne^® toothpaste and distilled water solution, (4) whitening Sensodyne^® toothpaste and distilled water solution, and (5) distilled water as a control group. The samples' force was measured using Instron at intervals of 0, 1, 7, 14, 21, and 28 days. Data were analyzed by SPSS software.

Results:

At the initial time point, the difference in the force values of elastomeric chain between any of the groups was not significant (P > 0.05). On the 1^st day, there was a significant difference (P < 0.05) between all groups except the groups of whitening Crest^®, regular, and whitening Sensodyne^® (P > 0.05). On days 7, 14, and 28, the rate of decline for all groups was statistically significant (P < 0.05).

Conclusions:

According to the results obtained in the present study, it seems that toothpastes without whitening agents have less effect on force decay of elastomeric chain over time.