*858The plaintiff, Kimberly C., appeals from the judgment of the trial court dissolving her marriage to the defendant, Anthony C.1 On appeal, the plaintiff claims that the court improperly (1) awarded the parties joint legal custody of their minor child by relitigating the issue of the occurrence of domestic violence between the parties when that issue had been determined in a prior proceeding and the court was bound by the finding on domestic violence in that proceeding by virtue of the doctrine of collateral estoppel, and (2) denied the plaintiff's motions for sexual behavior evaluation and substance abuse evaluation of the defendant. We disagree and, accordingly, affirm the judgment of the trial court.
The record reveals the following facts and procedural history. The plaintiff and defendant were married in Connecticut on July 21, 2011. One minor child was born during the marriage. On November 27, 2013, the plaintiff filed an application for relief from abuse from the defendant pursuant to General Statutes § 46b-15 (first *859restraining order application).2 That same day, the court, Graziani, J. , issued an ex parte restraining order effective until the court held a full hearing. On December 2, 2013, the plaintiff commenced the underlying dissolution action, citing the ground of irretrievable breakdown of the marriage, and seeking dissolution of her marriage to the defendant, equitable division of property and assets, alimony, child support, and sole custody of the parties' *109minor child. On December 11, 2013, the court, Boland, J. , issued a one year restraining order by written agreement of the parties; see General Statutes § 46b-66(a) ;3 which automatically expired on December 11, 2014. In that written agreement, the defendant agreed to the restraining order without admitting the truthfulness of the allegations contained in the plaintiff's application for relief from abuse. The agreement also permitted the defendant to have access to the parties' minor child.
On February 4, 2015, the plaintiff filed a second application for relief from abuse (second restraining order application). On February 17, 2015, the court, dos Santos, J. , conducted a hearing and heard testimony from the plaintiff about allegations of past abuse by the defendant. Although Judge dos Santos made a statement that he believed the plaintiff had been abused by the defendant, he nonetheless denied the application, concluding *860that the evidence was insufficient to find a ''continuous threat of present physical pain or physical injury'' required to issue a restraining order pursuant to § 46b-15. The plaintiff did not appeal that judgment.
On October 22, 2015, during the pendency of the dissolution action, the plaintiff filed a motion in limine seeking to preclude the defendant from relitigating findings in the second restraining order application that he had physically, verbally, and sexually abused the plaintiff on the ground of collateral estoppel. Judge Graziani denied the plaintiff's motion in limine on November 18, 2015. A three day dissolution trial took place from December 9, 2015 through December 11, 2015. Both parties testified at trial. The plaintiff testified that the defendant had physically, verbally, and sexually abused her during the course of the marriage. The defendant denied all allegations of abuse. On February 23, 2016, the court issued its written memorandum of decision, in which it found that neither the plaintiff nor defendant were credible witnesses and made no finding that the defendant had abused the plaintiff. The court found both parties responsible for the breakdown of the marriage. It dissolved the marriage, distributed the marital assets, awarded joint legal custody of the minor child to the parties with the plaintiff having the primary residence of the child, and made orders of visitation which provided the defendant with detailed parenting time, including overnights. This appeal followed.
In connection with the plaintiff's first claim that the doctrine of collateral estoppel precluded the court from making findings of fact that were made in the previous proceeding on the plaintiff's second restraining order application, we begin by setting forth the applicable standard of review and legal principles. ''Whether the court properly applied the doctrine of collateral estoppel is a question of law for which our review is plenary.
*861... The fundamental principles underlying the doctrine are well established. Collateral estoppel, or issue preclusion, is that aspect of res judicata which prohibits the relitigation of an issue when that issue was actually litigated and necessarily determined in a prior action between the same parties *110upon a different claim .... For an issue to be subject to collateral estoppel, it must have been fully and fairly litigated in the first action . It also must have been actually decided and the decision must have been necessary to the judgment....
''An issue is actually litigated if it is properly raised in the pleadings or otherwise, submitted for determination, and in fact determined.... An issue is necessarily determined if, in the absence of a determination of the issue, the judgment could not have been validly rendered.'' (Citations omitted; emphasis in original; internal quotation marks omitted.) Cadle Co. v. Gabel , 69 Conn. App. 279, 293-94, 794 A.2d 1029 (2002). ''To establish whether collateral estoppel applies, the court must determine what facts were necessarily determined in the first trial, and must then assess whether the [party] is attempting to relitigate those facts in the second proceeding.... In order for collateral estoppel to bar the relitigation of an issue in a later proceeding, the issue concerning which relitigation is sought to be estopped must be identical to the issue decided in the prior proceeding.'' (Citation omitted; emphasis in original; internal quotation marks omitted.) Kenneson v. Eggert , 176 Conn. App. 296, 305, 170 A.3d 14 (2017).
The plaintiff argues on appeal that under the doctrine of collateral estoppel, the trial court in the dissolution action was bound by the facts found in the proceeding on the second restraining order application that the defendant was physically, verbally, and sexually abusive to the plaintiff. ''To establish whether collateral estoppel applies, the court must determine what facts were necessarily determined in the first trial, and must then assess whether the [party] is attempting to relitigate those facts in the second proceeding.'' (Internal *862quotation marks omitted.) Marques v. Allstate Ins. Co. , 140 Conn. App. 335, 340, 58 A.3d 393 (2013). We now turn to the facts that were found in the second restraining order proceeding to determine if collateral estoppel prohibits the relitigation of those facts.4
In the proceeding on the second restraining order application, Judge dos Santos did not make any factual findings with regard to the alleged abuse; instead, he made only credibility determinations regarding the plaintiff, stating: ''The court accepts as credible the testimony of the [plaintiff] that she was physically, verbally, and sexually abused by her spouse.... I do believe your client about what happened to her sexually with her husband.... I cannot find based upon the evidence in its totality that the respondent stalked the applicant. I cannot find based upon the totality of the testimony that the respondent threatened the applicant. And I cannot find that this condition that existed at the time of the first ... restraining order that this has continued.... [T]here's really no basis, no finding that this condition continues to exist ... that this is a continuous threat of present physical pain or physical injury or that there's been stalking, or that there's been a pattern of threatening by the respondent. So on that basis, the court does deny the application.'' The court also did not make a finding that the plaintiff was being abused at the time of the hearing. Because the court denied the second restraining order application, *111finding no continuous threat to the plaintiff, we cannot hold that its credibility finding was necessarily determined, as the application could have been denied without the court determining that the plaintiff had been abused in the past. *863Furthermore, there are significant differences between the issues to be determined in a proceeding on an application for a restraining order and the issues to be determined in a dissolution action. Pursuant to § 46b-15, ''[d]omestic violence restraining orders will not issue in the absence of the showing of a threat of violence, specifically a continuous threat of present physical pain or physical injury to the applicant.'' (Internal quotation marks omitted.) Jordan M. v. Darric M. , 168 Conn. App. 314, 319, 146 A.3d 1041, cert. denied, 324 Conn. 902, 151 A.3d 1287 (2016). By contrast, ''[t]he purpose of a dissolution action is to sever the marital relationship, to fix the rights of the parties with respect to alimony and child support ... to divide the marital estate ... and to consider custody issues.'' (Citation omitted; internal quotation marks omitted.) Bouchard v. Sundberg , 80 Conn. App. 180, 189, 834 A.2d 744 (2003) ; see also Ireland v. Ireland , 246 Conn. 413, 430, 717 A.2d 676 (1998) (''best interests of the child must always govern decisions involving custodial or visitation matters'').
The only issue before Judge dos Santos in the proceeding on the second restraining order application was whether the plaintiff was exposed to a ''continuous threat of physical pain or physical injury'' by the defendant. The issues before Judge Graziani in the dissolution action, however, were whether the marriage was irretrievably broken down, alimony, child support, educational support, and the equitable division of the marital estate, as well as what orders of joint custody and visitation were in the best interests of the parties' minor child. Because the issue to be determined in the second restraining order proceeding, continuous threat of physical injury, was not identical to the issues to be determined in the dissolution proceeding, nor was there any indication that the issue of abuse had been necessarily determined in the second restraining order proceeding, collateral estoppel has no application. See, e.g., *864Gladysz v. Planning & Zoning Commission , 256 Conn. 249, 261, 773 A.2d 300 (2001) ; see also Aetna Casualty & Surety Co. v. Jones , 220 Conn. 285, 297, 596 A.2d 414 (1991). We conclude that the issues involved in the dissolution action were neither actually litigated nor necessarily determined in the proceeding on the second restraining order application, and, therefore, the court properly declined to apply the doctrine of collateral estoppel.
The plaintiff's second claim does not warrant significant discussion. The court's denial of the plaintiff's motions for sexual behavior evaluation and substance abuse evaluation for the defendant were discretionary in nature and are entitled to deferential review. See Loughlin v. Loughlin , 280 Conn. 632, 641, 910 A.2d 963 (2006) (''in ... questions arising out of marital disputes, this court relies heavily on the exercise of sound discretion by the trial court'' [internal quotation marks omitted] ). The plaintiff has failed to demonstrate that these rulings relied on clearly erroneous factual findings, a misapprehension of the law, or that the court otherwise abused its discretion.
Having thoroughly reviewed the record and the arguments of the plaintiff, we conclude that the plaintiff has not met her burden of proving either of the claims raised on appeal.
The judgment is affirmed.