Finishing Cases with Class III Molars

Comment by Dr. Rania AlRaddadi ..

I want to attach a paper of 3 case reports which discusses different scenarios which all finished with Class III molars.

I think that the paper is beneficial in terms of expanding our horizon when it comes to different treatment options, especially and as we all know that the introduction of extraction treatment by Tweed made Angle’s sagittal molar relationship less critical in orthodontics.

The paper will follow.

( PDF ) STRATEGIES TO FINISH ORTHODONTIC TREATMENT WITH A CLASS III MOLAR RELATIONSHIP:THREE PATIENT REPORTS

Download paper 1 here

UPDATE 29/11/2016 : A new article related to the same topic is shared by Dr. Khalid Zawawi and Dr.Ehdaa Elshawley . Thanks to them.

Download paper 2 here

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Bluegrass appliance

Comments by : Dr. Waleed Farran ..

Bluegrass appliance
Bluegrass appliance

Bluegrass appliance is a habit controller device.

Here is a link of an article on bluegrass appliance.

A Retrospective Study of the Use of the Bluegrass Appliance in the Cessation of Thumb Habits (pdf).

TIPS : General guidelines for Class III Management.

Tips by Prof. Ali Habeeb ..

Summerized by : Dr. Hani Alhebshi

Weekly-Tips-Image

First :Seek the cause of class III discrepancy , whether it is skeletal or dental ?  Using clinical examination and diagnostic records ; A deficiency in maxilla ,a prognathism in the mandible or both can be addressed.Checking functional shift or Psudo Class III by guiding mandible to Centric relation.

Second : The developmental age of the patient will determine the way of management. Continue reading TIPS : General guidelines for Class III Management.

Borderline Class III cases : Surgery vs. Camouflage.

Written by : Dr. Rania Alraddadi ..

Dear all,

I just wante d to summarize what we discussed today regarding the treatment decision in borderline Class III cases:

Surgery vs. Camouflage:

Factors to consider:

1- Extra oral exam including both profile and frontal views (is the mandible big? In AP? In transverse including the symmetry and In vertical?).

2- Family history. Continue reading Borderline Class III cases : Surgery vs. Camouflage.

Effect of water and saliva contamination on shear bond strength of brackets bonded with conventional, hydrophilic, and self-etching primers

This study assessed the effect of water and saliva contamination on the shear bond strength and bond failure site of 3 different orthodontic primers (Transbond XT, Transbond Moisture Insensitive Primer, and Transbond Plus Self Etching Primer; 3M Unitek, Monrovia, Calif) used with a light-cured composite resin (Transbond XT). Bovine permanent mandibular incisors (315) were randomly divided into 21 groups (15 in each group). Each primer–adhesive combination was tested under 7 different enamel surface conditions: (1) dry, (2) water application before priming, (3) water application after priming, (4) water application before and after priming,

Continue reading Effect of water and saliva contamination on shear bond strength of brackets bonded with conventional, hydrophilic, and self-etching primers

Effect of moisture, saliva, and blood contamination on the shear bond strength of brackets bonded with a conventional bonding system and self-etched bonding system

Abstract Background: The success of bonding brackets to enamel with resin bonding systems is negatively affected by contamination with oral fl uids such as blood and saliva. The new self-etch primer systems combine conditioning and priming agents into a single application, making the procedure more cost effective. Objective: The purpose of the study was to investigate the effect of moisture, saliva and blood contamination on shear bond strength of orthodontic brackets bonded with conventional bonding system and self-etch bonding system. Continue reading Effect of moisture, saliva, and blood contamination on the shear bond strength of brackets bonded with a conventional bonding system and self-etched bonding system

Effect of Load Deflection on Corrosion Behavior of NiTi Wire

ABSTRACT

For dental orthodontic applications, NiTi wires are used under bending conditions in the oral environment for a long period. The purpose of this study was to investigate the effect of bending stress on the corrosion of NiTi wires using potentiodynamic and potentiostatic tests in artificial saliva. The results indicated that bending stress induces a higher corrosion rate of NiTi wires in passive regions. Continue reading Effect of Load Deflection on Corrosion Behavior of NiTi Wire

TIPS : Condylar Hypertrophy and Mandibular asymmetry

Tip by Prof.Fahad Alsolaimani :

Asymetric manibular appearnce can be caused by unilateral overgrowth of one condyle.The overgrowth can be due to Rheumatic Artheritis , Trauma or inflammation of the condyle (s).

Mandibular condylar hyperplasia ( CH ) is a condition that causes excessive growth of the condylar head and neck , as well as the mandible , creating functional and cosmetic deformities of the face and jaw .


Signs of unilateral Condylar hyperplasia (most common):

1. Deviation of the mandible to the opposite side of the condyle that has overgrowth. ( I.e if overgrowth on left condyle , deviation will be toward the right ). Continue reading TIPS : Condylar Hypertrophy and Mandibular asymmetry

Effect of rapid maxillary expansion on the vertical dimension.

Written by : Dr. Rania Alraddadi.

Dear all,

Another topic that we constantly discuss is the effect of rapid maxillary expansion on the vertical dimension.

It was shown that in the long term the  side effects on the vertical dimension are actually minimum.

Here is a systematic review:

http://libdigi.unicamp.br/document/?down=32604 that argues the real long term benefits claimed by bonded RPE users.

According to them, even after the use of bonded RPE, some vertical adverse effects are inevitable. They explained that the vertical change is not caused by buccal tipping of maxillary molars only (which can be controlled by using bonded RPE) but also caused by the whole maxilla being displaced downward. So it was suggested that in cases where vertical dimension is critically sensitive, the use of vertical pull chin cup (or I would also add high pull HG) might be an option.

Explanation of how mandibular expansion follows the Maxillary.

Written by : Dr. Rania Alraddadi .

Dear all,

Today we discussed expansion and mentioned that in most of the cases mandibular arch “follows” the expansion of the maxillary arch and so we rarely use expansion appliances in the mandible.

I just wanted to share the explanation to help the junior residents and refresh the info for the rest of us.

According to Hass, this happens due to several factors:

1- The forces of occlusion were altered by expansion so that the normal lingual vector on the mandibular teeth was lost and the lateral movement of maxilla widened the area of attachment of buccal musculature which caused change in balance between buccal surface and the tongue (a decrease in pressure from the cheeks as result of upper arch expansion will allow the tongue to exert more pressure thus uprighting and expanding lower arch).

2- Thickness of the appliance (3 quarters of an inch) might have caused the tongue to be in a lower position thus exerting even more lingual pressure on mandibular teeth.

Here is the original article:

http://www.angle.org/doi/pdf/10.1043/0003-3219(1961)031%3C0073:reotmd%3E2.0.co;2

Thank you.