How to hid button in nav-bar

ionic-v1
1

i want to hide ion-navicon-round button in specific page, how can i hide that button, because it show up with back button. heres my index.html

<ion-nav-bar class="bar-calm">
        <ion-nav-buttons side="left" >
            <button class="button button-icon icon ion-navicon-round" >   
            </button>
        </ion-nav-buttons>
        <ion-nav-back-button class="button-icon icon ion-ios-arrow-back">Back</ion-nav-back-button>

        <ion-nav-buttons side="right">
            <button class="button button-icon icon ion-search" ui-sref="search" >   
            </button>
        </ion-nav-buttons>
    </ion-nav-bar>

and here is my log in. i want the ion-navicon-round do not appear

        <ion-list>
            <label class="item item-input">
                <span class="input-label">Username</span>
                <input type="text" placeholder="">
            </label>
            <label class="item item-input">
                <span class="input-label">Password</span>
                <input type="password" placeholder="">
            </label>
        </ion-list>
        <a href="#/ForgotPass" class="btn-custom button button-positive button-clear button-block ">
            Forgot Password
        </a>
        <div class="btn-custom spacer" style="height: 40px;"></div>
        <a href="#/Reguler" class="btn-custom button button-dark button-block ">
            Sign In
        </a>
        <a href="#/Signup" class="btn-custom button button-positive button-clear button-block ">
            Or create an account
        </a>
        <button class="btn-custom button button-positive button-block  icon-left ion-social-facebook">
            Sign In with Facebook
        </button>
        <button class="btn-custom button button-assertive button-block  icon-left ion-social-google">
            Sign In with Google
        </button>
2

You can use $ionicConfig in the controller to hide the back button.

$ionicConfig.platform.ios.backButton.previousTitleText(false);